DSP56F807VF80E - Freescale Semiconductor

MOTOROLA

Freescale Semiconductor,

Inc.

Order by AN1924/D

Semiconductor Application Note (Motorola Order Number)

Rev. 0, 4/ 20 01

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Interfacing Serial LCDs to

a DSP56F805’s SCI and

Porting Code Using the

Embedded SDK

Freescale

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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

Interfacing LCDs and Po

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ting

Code

Joseph R. Pasek

1. Introduction

This application follows an earlier application note (“Some

General DSP568xx Interface Examples using the

Embedded SDK”, AN1921/D) that focused on interfacing

the DSP56824 with an LCD, keypad and an SPI-based

device, an 11-channel, 12-bit A/D converter (TLC2543). That

note described interfacing via the SPI port, either directly, or

with the MAX3100 chip that converts SPI signals to a

com patible RS-232 form at.

This note will show the relative ease of interfacing either

NetMedi a’s L CD+, includi ng a keypa d, or Crystalf ontz’ s 6 34

Intelligent Serial Display to the Serial Communication

Interface (SCI) port of a DSP56F805. The demonstration

code will be written in C and will use Motorola’s Embedded

SDK libraries.

The SC I is a thr ee-line interf ace, consist ing of a transmit line

(TXD), a receive line (RXD), and a ground line (GND). The

interface allows for asynchronous communication with

peripheral devices and other MCUs. The protocol is very

similar to an RS-232-based interface, except that the voltage

range is that of TTL.

This note will also show the modifications required to

convert the program for the DSP56824 featured in

Application Note AN1921/D to the DSP56F805, using the

Embedded SDK. The modifications are relatively minor and

made only to the respective processor’s SDK-supported

interface code.

Contents

1.

Introduction

.....................................1

2. Interface

Description

.......................2

3. Descriptions of the Intelligent

LCD Mod ules ..... ... ........... ..... . ...3

3.1 Crystalfontz’s 634 I ntelligent

Serial LCD Module ......................... 4

3.2 NetMedia’s LCD+ Serial LCD

Module............................................. 5

4. Interfacing the LCDs to the

DSP56F805

................................5

4.1 Connecti ng the 634 LCD to the

DSP56F805...................................... 5

4.2 Software for the 634 LCD and the

DSP56F805...................................... 6

4.3 Conne cting the LCD+ to the

DSP56F805...................................... 7

4.4 Software for the LCD+ and the

DSP56F805...................................... 8

5. Converting SDK-Based

Code

.......10

6.

Conclusions

...................................15

7.

References

.....................................15

Appendix A. NetMedia’s Serial

LCD+ ......................................16

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Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

Interface Description

Interface Description ARCH

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2. Interface D

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Motorola’s DSP56F80x processors are DSP/MCU hybrids, which not only have the expected

capabilities of a DSP, but also the features that allow the processor to perform the functions of a

microprocessor. Additionally, the DSP56F80x family of processors offers Systems On a Chip (SOC)

technology, and, as shown in Table 1, has a number of on-chip capabilities to accommodate

measurements and interfacing to various devices.

Motorola’s DSP56F80x processors are DSP/MCU hybrids, which not only have the expected

capabilities of a DSP, but also the features that allow the processor to perform the functions of a

microprocessor. Additionally, the DSP56F80x family of processors offers Systems On a Chip (SOC)

technology, and, as shown in Table 1, has a number of on-chip capabilities to accommodate

measurements and interfacing to various devices.

Table 1: Peripher al De vic e Interfaces Found on the DSP56F80x Pro cess ors Table 1: Peripher al De vic e Interfaces Found on the DSP56F80x Pro cess ors

SOC Devices SOC Devices Description Description Availability Availability

Motorola Scalable

Controller Area Network

(MSCAN)

Communication Controller implementing

CAN 2.0 A/B DSP56F803

DSP56F805

DSP56F807

MUXed input 12-bit

Analog-to-Digital

Converters (ADC)

Dual 4-input 12-bit ADC DSP56F801

DSP56F803

DSP56F805

DSP56F807

Quadrature Decoders Us ed to det ermine orienta tion of a motor

shaft DSP56F801

DSP56F803

DSP56F805

DSP56F807

Pulse Width Modulator

(PWM) Module A modulation technique employed to

control various kinds of electric motors DSP56F801

DSP56F803

DSP56F805

DSP56F807

Serial Communication

Interfa ce (SCI) Module This interface allows asynchronous

seri al communica tions with peripheral

devices and MCUs. A “TTL” RS-232

interface.

DSP56F801

DSP56F803

DSP56F805

DSP56F807

Serial Peripheral Interface

(SPI) Module This allows full-d uplex, synchronous,

serial communication between the DSP

and peripheral devices

DSP56F801

DSP56F803

DSP56F805

DSP56F807

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

The interface techniques explained here will work equally well with any member of the DSP56F80x

group of processors; this application was developed for the DSP56F805 processor. Figure 1 shows the

EVM card and the external interfaces to the two available SCI modules found on the DSP56F805.

Fig ure 2 provides a closer view, centered on the DSP’s SCI1 interface, the EVM board’s J17 header.

The int elli gent LCDs will be connect ed to the SCI1 por t.

2 Interfacing LCDs and Porting Code

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Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

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Descriptions of the Intelligent LCD Modules Descriptions of the Intelligent LCD Modules

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

Figure 1. Motorola ’s DSP5 6F805 EVM Board

Figure 2. The J17 Header (SCI1 Port) on the DSP56F805 EVM

Board

3. Descriptions of the Intelligent LCD Modules

Sp ecifi cati o ns of t he tw o int ell ig en t serial LC D d evic es wh ich wi ll b e inte r face d to th e DS P56 F8 05’ s

SCI1 p ort are contained in this sect ion.

MOT

Interfacing LCDs and Porting Code 3

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Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

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Descriptions of the Intelligent L CD Modules Descriptions of the Intelligent L CD Modules

3.1 Crystalfontz’s 634A

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3.1 Crystalfontz’s 634A

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This LCD module has attracted attention for its capability of interfacing as either an RS-232 device or

as an SPI device. As it comes from the factory, it is set up for 9600 Baud RS-232 operation. To use it

as an SPI device, the Jumper JPA must be soldered closed. However, the throughput of the LCD’s SPI

port is very slow (Fclk.max=18 kHz) and SPI ports on the DSP56F80x family are incapable of such

This LCD module has attracted attention for its capability of interfacing as either an RS-232 device or

as an SPI device. As it comes from the factory, it is set up for 9600 Baud RS-232 operation. To use it

as an SPI device, the Jumper JPA must be soldered closed. However, the throughput of the LCD’s SPI

port is very slow (Fclk.max=18 kHz) and SPI ports on the DSP56F80x family are incapable of such

slow speed without extraordinary manipulation of the DSP chip’s clocking rate. Therefore, interface as

an RS-232 device is recommended. an RS-232 device is recommended.

These are the features of the 634: These are the features of the 634:

• RS-232 in terface (12 00, 2400, 4800, and 9600 Baud) • RS-232 in terface (12 00, 2400, 4800, and 9600 Baud)

• DB9 connect or provided f or a simple RS- 232 h ooku p • DB9 connect or provided f or a simple RS- 232 h ooku p

• Availab le with brigh t, even, sof tware-adjusta ble LED backl ig hti ng or in a low-power

reflective model

• Availab le with brigh t, even, sof tware-adjusta ble LED backl ig hti ng or in a low-power

reflective model

• Availab le as eit her 20 x4 (Model 634) or 16x2 (Mode l 6 32) dis pl ay • Availab le as eit her 20 x4 (Model 634) or 16x2 (Mode l 6 32) dis pl ay

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• Software-controlled contrast • Software-controlled contrast

• “Gapless” horizontal contrast • “Gapless” horizontal contrast

• Software-controlled, terminal-style automatic scrolling and line wrapping • Software-controlled, terminal-style automatic scrolling and line wrapping

• Unique “Scrolling Marquees” feature continuously scrolls a message across the display

without host interventio n

• Unique “Scrolling Marquees” feature continuously scrolls a message across the display

without host interventio n

• Low-speed “SPI” and “Invert ed TTL” RS-232 for embedded app licat io n • Low-speed “SPI” and “Invert ed TTL” RS-232 for embedded app licat io n

• Buffered communication • Buffered communication

• Low power : Non-back li ght operati on wi ll sel f -powe r from the DTR and RTS lines of most

serial ports

• Low power : Non-back li ght operati on wi ll sel f -powe r from the DTR and RTS lines of most

serial ports

A microcontroller is built into the LCD’s support and a ROM stores the necessary code for its

operation. Further information is available from Crystalfontz’s web site: www.crystalfontz.co

A microcontroller is built into the LCD’s support and a ROM stores the necessary code for its

operation. Further information is available from Crystalfontz’s web site: www.crystalfontz.com.

Figure 3 shows the 634’s display on power-up.

Figure 3. Crystalfontz’s 634 Intelligent Serial LCD Module Display

3.2 NetMedia’s LCD+ Serial LCD Module

NetMedia’s intelligent LCD was featured in the application note, “General DSP568xx Interface

Examples Using the Embedded SDK”, AN1921/D. The LCD+ comes with a 20x4 display and a

built-in port capable of supporting a keypad up to 4x4 in size. It supports an RS-232 interface that can

work a t either no rmal or TTL vol ta ge le vel s.

4 Interfacing LCDs and Porting Code

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Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

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Interfacing the LCDs to the DSP56F805 Interfacing the LCDs to the DSP56F805

Among the features

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Among the features

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• Seria l I /O: RS-232 or In verte d TTL ( 2400 to 57600 Baud (8,N, 1)) • Seria l I /O: RS-232 or In verte d TTL ( 2400 to 57600 Baud (8,N, 1))

• Keypad input: 4x4 matrix type • Keypad input: 4x4 matrix type

• Power re qui re me nts: 5V to 15V DC at 9mA ( 200mA maxi mum wit h t he ba ckl ight on) • Power re qui re me nts: 5V to 15V DC at 9mA ( 200mA maxi mum wit h t he ba ckl ight on)

• LCD type: 4x20 Supertwist • LCD type: 4x20 Supertwist

• Analog- to- Di git al Converter s: a bank of 10 wi th 10-b i t r es oluti o n • Analog- to- Di git al Converter s: a bank of 10 wi th 10-b i t r es oluti o n

• Relay Drivers • Relay Drivers

• FlashROM • FlashROM

Althoug h the LCD+ may offer m or e t han n eed ed for thi s e ff ort, ot he r ap pli cations may requi re so me of

its f eatures. The LCD+ has its ow n microcontrol le r and software in ROM to im plement its f eatures. An

example of its display is shown in Figure 4.

Althoug h the LCD+ may offer m or e t han n eed ed for thi s e ff ort, ot he r ap pli cations may requi re so me of

its f eatures. The LCD+ has its ow n microcontrol le r and software in ROM to im plement its f eatures. An

example of its display is shown in Figure 4.

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Figure 4. Example of NetMedia’s LCD+

display

See Appendi x A. for additional details about the LCD+.

4. Interfacing the LCDs to the DSP56F805

This section explains how to connect each LCD to the DSP56F805 device and contains code examples

demons tratin g the inte rface.

4 . 1 C on n e ct i n g t h e 6 3 4 LC D t o t he D S P 5 6 F8 0 5

The Crystalfontz 634 Intelligent Serial LCD module comes equipped with a male DB9 connector port.

The lines on the female side are connected in null modem fashion to the three pins of the EVM board’s

J17 header; i.e., EVM_TXD is connect ed to LCD_RXD.

4.2 Software for the 634 LCD and the DSP56F805

Metrowerks’ CodeWarrior, an Embedded DSP C compiler for the DSP568xx, was used to write,

compile and execute the code to control the 634 LCD. Code Example 1 demonstrates the interface

between DSP56F805 and the 63 4 LCD de vic e.

MOT

Interfacing LCDs and Porting Code 5

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Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

Interfacing the LCDs to the DSP56F805

Code Example 1. LCD634_sci_test.c

// LCD634_sci_test.c program tests the interface between a DSP

// 56805 using its SCI port and a LCD (Crystalfontz

// 634 Intelligent serial display - March 1, 2001 )

#include "port.h"

#include "io.h"

#include "bsp.h"

#include "fcntl.h"

#include "sci.h"

#include "stdio.h"

#include "assert.h"

#include "string.h"

#include "timer.h"

int main()

{ UWord16 I;

int SciFD;

sci_sConfig SciConfig;

struct timespec FiveSeconds = {5,0};

char aastring[]={" DSP56F805-SCI "};

char bstring[]={" LCD 634 Disp Test "};

char input, inputarray[8];

UWord16 NewScr[2]= {12,0}; // Clear Screen on LCD

char astring[20];

UWord16 temp;

/* Set-up parameter for SCI port - 8 bit, no parity, TX_inverted */

6 Interfacing LCDs and Porting Code

MOT

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

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Interfacing the LCDs to the DSP56F805

/* Display some A

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nanosleep(&FiveSeconds, NULL); /* Wait five seconds */

write( SciFD, NewScr, 1 ); /* Wipe clean LCD’s Display */

for ( I=0; I < 29; I++ ) /* Write some numbers to LCD */

{ sprintf(astring, "%d ", I );

write (SciFD, astring, strlen(astring));

}

nanosleep(&FiveSeconds, NULL); /* Wait five seconds */

write( SciFD, NewScr, 1 ); /* Wipe clean LCD’s Display */

temp = ’A’;

for ( I=0; I<26; I++ ) /* Write capital letters to LCD */

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{ sprintf( astring, "%c", temp++);

write (SciFD, astring, strlen(astring) );

}

temp = ’a’;

for ( I=0; I<26; I++ ) /* Write small letters to LCD */

{ sprintf( astring, "%c", temp++);

write (SciFD, astring, strlen(astring) );

}

nanosleep(&FiveSeconds, NULL); /* Wait five seconds */

}

4.3 Connecting the LCD+ to the DSP56F805

In AN1921/D, the LCD+ device was interfaced to one of the DSP56824’s SPI ports using th e Maxim

MAX3100 UART chip’s bi-directional capability to convert data conveyed by an SPI port to an

RS-232 format. However, the DSP56F80x’s SCI port can be connected directly to an RS-232 device

using the TTL voltage option compatible with NetMedia’s LCD+, making additional hardware

unnecessary.

The LCD+ has a much faster processor and the ability to support baud rates up to 57600. It also

provides support for a 4x4 matrix keypad which allos user input, resulting in two-way communication

between the LCD+ and the DSP56F80 5.

4 .4 S o ft wa r e f o r th e LC D+ a n d th e DS P5 6 F8 0 5

The software is written in C and makes full use of the SCI support provided in the Embedded SDK.

Code Example 2 demonstrates the interface between the DSP56F805 and NetMedia’s LCD+ serial

display.

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Interfacing LCDs and Porting Code 7

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Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

Interfacing the LCDs to the DSP56F805

Code Example 2. LCDplus_sci_test.c

// LCDplus_sci_test.c program tests the interface to a DSP56F805 SCI

// serial port LCD (NewMedia’s Serial LCD+ ) and keypad

#include "port.h"

#include "io.h"

#include "bsp.h"

#include "fcntl.h"

#include "sci.h"

#include "stdio.h"

#include "assert.h"

#include "string.h"

int main()

{

UWord16 I;

int SciFD;

sci_sConfig SciConfig;

static char aastring[]={"DSP56F805-LCDplus "};

static char bstring[]= {"and Keypad test "};

int sum;

char input, inputarray[8];

UWord16 NewScr[2]= {12,0}; // Clear Screen on LCD

UWord16 BackLightOn[2] = {14,0}; // Turn on LCD’s Backlight

UWord16 LightLevel[2] = {2,70}; // Set back light level here set to 70

UWord16 DispContrast[2] = {3,100}; //Set display contrast here set to 100

UWord16 DispKeypad[2] = {24,1};

static char astring[40];

char LF[]={10,0}, CR[]={’E’}; // LCD Line Feed and CR

UWord16 ii;

UWord16 BS[]={8,0}; // LCD backspace

/* Open SCI Serial Device */

8 Interfacing LCDs and Porting Code

MOT

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

ARCH

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Converting SDK-Based

Code

write (SciFD, bstriA

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;CALE SEMICONDUCTOR, INC. 2005

read (SciFD, &input, 1);

/* Display some numbers on display */

write( SciFD, NewScr, 1 );

strcpy( bstring, "Input at key (’0000’ to exit) \n");

write( SciFD, bstring , strlen(bstring));

strcpy( bstring, "Hit key to start");

strcat( bstring, LF );

write( SciFD, bstring , strlen(bstring));

write( SciFD, NewScr, 1 );

Freescale

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

/* The following loop polls keypad input, until "0000" is input */

/* Keypad entries are displayed on both LCD and in IDE’s

text window */

ii = 0;

while ( true )

{ read( SciFD, &inputarray[ii], 1);

if ( inputarray[ii] == CR[0] )

{ inputarray[ii] = 0;

sprintf(bstring, " Input- %s\n", inputarray );

write ( SciFD, bstring, strlen(bstring));

ii = 0;

}

else

{ write( SciFD, &inputarray[ii], 1);

ii++;

}

if ( strcmp(inputarray,"0000") == 0 ) break;

}

write( SciFD, NewScr, 1 );

strcpy( bstring, " Done! ");

write(SciFD, bstring, strlen(bstring) );

close(SciFD);

}

5. Converting SDK-Based Code

In AN1921/D, an application was developed that employed a serial LCD, keypad, and

analog-to-digital converter (ADC) attached to the SPI ports of the DSP56824. This section will

descri be the code modi fi ca ti ons required to conver t t ha t ap plic a tion t o work on the DSP5 6F8 05.

MOT

Interfacing LCDs and Porting Code 9

For More

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,

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to:

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.

f

r

ee

s

c

a

l

e.

c

om

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

Converting SDK-Based Code

First, the SDK serial support native to the DSP56824 is not available or needed in the DSP56F805

environment. As shown previously, NetMedia’s LCD+ serial device and its associated keypad work

very well with the DSP56F805’s SCI port. The serial-related DSP56824’s IntFaceBaro.c is shown in

Code Example 3, which details setup of the interface to the LCD and keypad using the DSP56824’s

SDK serial library.

Code Example 3. Establishment of Interface

/* Open Serial Port via SPI1 and EVM UART */

Uart = open( BSP_DEVICE_NAME_SERIAL_0, 0 );

10 Interfacing LCDs and Porting Code

MOT

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

ARCH

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. C. 2005

Converting SDK-Based

Code

Code E xample 5. OriginA

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C

DH

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od

D

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SP

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ONDUCTOR,

INC. 2005

SpiParams.bSetAsMaster = 1; /* SPI0 is set as master */

/* Open SPI0 port */

SerialMaster = open( BSP_DEVICE_NAME_SPI_0, 0, &SpiParams );

.

/* Set bit clock rate */

ioctl( SerialMaster, SPI_PHI_DIVIDER_32, NULL );

/* Set Data format for 16 bit */

ioctl( SerialMaster, SPI_DATAFORMAT_RAW, NULL );

Freescale

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

/* SS can be left low between successive SPI bytes */

ioctl( SerialMaster, SPI_CLK_PHASE_SS_CLEAR, NULL);

Code Example 6. DSP56824 Adapted to DSP56F805’s SPI

SpiParams.bSetAsMaster = 1; /* SPI0 is set as master */

SpiParams.pSlaveSelect = NULL; /* GPIO Pin 5 used for SS */

SpiParams.pSlaveDeselect = NULL;

SpiParams.TransmissionSize = 16; /* Size of transmission */

/* Open SPI0 port */

SerialMaster = open( BSP_DEVICE_NAME_SPI_0, 0, &SpiParams );

.

/* Set bit clock rate */

ioctl( SerialMaster, SPI_BAUDRATE_DIVIDER_32, NULL );

/* SS can be left low between successive SPI bytes */

ioctl( SerialMaster, SPI_CLOCK_PHASE_NOTSET, NULL);

The code modification in Code Example 6 permits the DSP56F805’s SPI port to interface with the

TLC2543 ADC chip.

The complete details of code ported from the DSP56824 to the DSP56F805 environment using the

Embedded SDK are shown in Code Ex ample 7.

Code E xample 7. IntFaceBaro.c for the DSP56F 805 Environment

/* IntFaceBaro.c - Procedure used to interface to TLC2543 - 12-bit

analog-to-digital

converter with serial control and 11 analog inputs. The DSP56F805

SPI0 port is employed. The software is developed for the DSP56F805

EVM environment. Interface to NetMedia LCD+ serial display device

and keypad is also included - March 1, 2001 */

MOT

Interfacing LCDs and Porting Code 11

For More

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,

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to:

www

.

f

r

ee

s

c

a

l

e.

c

om

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

Converting SDK-Based Code

#include "io.h"

#include "fcntl.h"

#include "bsp.h"

#include "spi.h"

#include "stdio.h"

#include "sci.h"

#include "string.h"

#include "port.h"

#include "timer.h"

#include "types.h"

#include "math.h"

#include "lcd.h"

#include "TLC2543.h"

// Prototype of procedure

void BaroAdj( int , Word32 * );

void main(void)

{ static spi_sParams SpiParams;

int SciFD;

static sci_sConfig SciConfig;

char TitleString1[] = {"DSP Interface Demo"};

char TitleString2[] = {" Barometric Meas.\n"};

char astring[20];

static char inputarray[8];

struct timespec OneMillisecond = {0,1000000};

int SerialMaster;

static UWord16 ADcmd;

static UWord16 Datain, DataStore[70];

Word16 i, ii;

static Word32 sum;

static Word32 Vcount;

static Word32 BaroPress, BAdj;

SpiParams.bSetAsMaster = 1; /* SPI0 is set as master */

SpiParams.pSlaveSelect = NULL; /* GPIO Pin 5 used for SS */

SpiParams.pSlaveDeselect = NULL;

SpiParams.TransmissionSize = 16; /* Size of transmission */

/* Open SPI0 port */

SerialMaster = open( BSP_DEVICE_NAME_SPI_0, 0, &SpiParams );

/* Open SCI for LCD and keypad devices */

12 Interfacing LCDs and Porting Code

MOT

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

Converting SDK-Based

Code

SciFD = open( BSP_DEVICE_NAME_SCI_1, 0, &SciConfig );

ioctl( SciFD, SCI_DATAFORMAT_EIGHTBITCHARS, NULL );

/* Set bit clock rate */

ioctl( SerialMaster, SPI_BAUDRATE_DIVIDER_32, NULL );

/* SS can be left low between successive SPI bytes */

ioctl( SerialMaster, SPI_CLOCK_PHASE_NOTSET, NULL);

/* TLC2543 is commanded to use analog input 8,

Output data length = 16 bits,

Output data format = MSB first, unsigned integer */

MOT

Interfacing LCDs and Porting Code 13

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

ARCH

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Converting SDK-Based Code

A

/*

RC

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*/

ICONDUCTOR, INC. 2005

nanosleep( &OneMillisecond, NULL );

DataStore[i] = Datain;

sum += Datain; /* accumulate measurements for */

/* batch averaging */

}

Vcount = (sum >> 6);

/* Compute Barometric pressure in millibars, the following

expression uses 32-bit arithmetic and 10 bit left on

all coefficients, equation scaled for millibars and a

12 bit ADC is

P = 0,271267*Vcount + 105.56

Freescale

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

Equation taken from MPX4115A Tech Data sheet */

BaroPress = (278 * Vcount + 108093) >> 10;

BaroPress += BAdj;

PosCursor[1] = 42; /* Set Cursor position in LCD */

write( SciFD, PosCursor, 2);

/* Send result to LCD */

sprintf( astring, "P = %ld mbars", BaroPress );

write( SciFD, astring, strlen(astring) );

}

close(SerialMaster);

}

/* This procedure is called when it is determined that the user desires

to enter a correction term to the barometric pressure measurement to

compensate fo the altitude above sea-level of the sensor.

It is expected that the user will provide the pressure adjustment in

millibars. */

void BaroAdj( int SciFD, Word32 *padj )

{ char astring[]={"Baro Height Adj\n"};

char bstring[]={"Enter (mb) = "};

char iarray[8];

int icount, temp, i, tenpow;

write( SciFD, NewScr, 1 );

PosCursor[1] = 22;

write( SciFD, PosCursor, 2);

write( SciFD, astring, strlen(astring));

PosCursor[1] = 42;

write( SciFD, PosCursor, 2);

write( SciFD, bstring, strlen(bstring));

icount = 0;

while (true)

{ read( SciFD, &iarray[icount], 1 );

14 Interfacing LCDs and Porting Code

MOT

For More

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.

f

r

ee

s

c

a

l

e.

c

om

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

ARCH

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Conclusions

if

AR

(

C

iH

ar

IV

ra

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y

D

[i

B

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E

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E )

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;NDUCT OR, INC. 2005

if ( (iarray[icount] >= ’0’) && (iarray[icount] < ’9’))

{ write( SciFD, &iarray[icount], 1 );

icount++;

}

iarray[icount] = 0;

sscanf(iarray, "%d", &temp );

*padj = (Word32)temp;

}

6. Conclusions

Freescale

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Th is application note was written to describe the interface cap abilities of the Motorola DSP56 F80x. It

has shown that by using the higher-order C language and the facilities provided by the Embedded

SDK, a user can easily interface a serial-based intelligent LCD with a built-in keypad support to the

processor’s SCI port without additional hardware. The code examples demonstrated that with one

brand of LCD, serial module bi-directional communication was established and maintained effectively

and reli abl y.

Additionally, the software program IntFaceBaro.c, generated for the DSP56824 in Appl ica tion N ot e

AN1921/D, was converted quickly and efficiently to operate the serial LCD and keypad, and an

SPI-based analog-to-digital converter was interfaced to an absolute atmospheric pressure sensor from

a DSP56F805. Most of the code remained the same; changes were required only to the code that

controlled the SCI and SPI po rts.

7. References

1. Some General DSP568xx Interface Examples usi ng the Embedded SDK, AN1921/D

2. DSP5680x User’s Manual, DSP 56F801-7U M/D

3. DSP56F805 Ev aluation Module Hardware User ’s Manual, DSP56F 805EVMUM/D

4. Embedded S DK (Soft ware Devel opment Kit) Progr ammer’s Guide, SDK122/D

MOT

Interfacing LCDs and Porting Code 15

For More

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,

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to:

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.

f

r

ee

s

c

a

l

e.

c

om

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

ARCH

F

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, IN

. C. 2005

ARCH

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Net Media’ s Serial LCD +

Appendix AA

.RCHN

IVE

eD

tM

BY

eF

d

R

iE

a

E

’S

sCS

AL

e

E

ri

Sa

El

MI

L

CO

C

N

D

DU

+

CT OR, INC. 2005

Appendix AA

.RCHN

IVE

eD

tM

BY

eF

d

R

iE

a

E

’S

sCS

AL

e

E

ri

Sa

El

MI

L

CO

C

N

D

DU

+

CT OR, INC. 2005

The Serial LCD+ is a 4x20 LCD display with a built-in bi-directional serial interface. The unit is

controlled using standard RS-232 serial signals from a host computer or microcontroller. The LCD+

supp orts t hes e s erial da ta ra tes : 1200, 2 400, 48 00, 9600 , 192 00, 3 84 00, and 57600 baud .

The Serial LCD+ is a 4x20 LCD display with a built-in bi-directional serial interface. The unit is

controlled using standard RS-232 serial signals from a host computer or microcontroller. The LCD+

supp orts t hes e s erial da ta ra tes : 1200, 2 400, 48 00, 9600 , 192 00, 3 84 00, and 57600 baud .

A.1 Pin Definitions A.1 Pin Definitions

Figure A-1 shows a top-down view of the LCD+ (in this view, the LCD display module has been

removed) . The pin def in ition s ar e identi fi ed.

Figure A-1 shows a top-down view of the LCD+ (in this view, the LCD display module has been

removed) . The pin def in ition s ar e identi fi ed.

Freescale

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

Figure A-1. LCD+ Pin

Definitions

A.2 Serial I/O

The serial I /O heade r i s made up of fi ve conne cti ons ; Table A-1 defines the pins.

Table A-1. Serial I/O Pin

Definitions

Pin # Description

1 TX serial output - Top serial I/O pin in Figure A- 1

2 RX serial input – Next pin down

3 Not connected

4 GND – connected to host computer / c serial ground

5 A +5V courtesy connection (maximum 20mA)

16 Interfacing LCDs and Porting Code

MOT

For More

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to:

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.

f

r

ee

s

c

a

l

e.

c

om

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

available from Freescale for import or sale in the United States prior to September 2010: DSP56F807VF80, DSP56F807VF80E

ARCH

F

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. C. 2005

ARCH

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NetMedia’s Serial

LCD+

NetMedia’s Serial

LCD+

A.3 Power Input A.3 Power Input ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 20 05 ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

The power input section consists of four through holes (Solder pads). The two holes marked GND are

grounds. The hole marked +5.5V to +15V is tied to the onboard regulator of the LCD+ module. The

hole marked +5V ties to the +5V bus and is used to bypass the LCD+’s onboard regulator when a

regulate d +5V source is supplied.

The power input section consists of four through holes (Solder pads). The two holes marked GND are

grounds. The hole marked +5.5V to +15V is tied to the onboard regulator of the LCD+ module. The

hole marked +5V ties to the +5V bus and is used to bypass the LCD+’s onboard regulator when a

regulate d +5V source is supplied.

A.4 ADC Inputs A.4 ADC Inputs

The eight ADC inputs are labeled 1 – 8. By default, all ADC inputs are set to read voltage in the 0 to The eight ADC inputs are labeled 1 – 8. By default, all ADC inputs are set to read voltage in the 0 to

+5V range. +5V range.

A.5 Relay Driver Outputs A.5 Relay Driver Outputs

There are nine Relay Driver connections (Labeled on the underside of the board as R1-8 and

RLY_VDC). The connections labeled R1-8 are the relay driver chip outputs; the RLY+VDC

connectio n provides access to the ULN2803A dr ive r chi p’s in ter na l back EMF prot ec tion di ode s.

There are nine Relay Driver connections (Labeled on the underside of the board as R1-8 and

RLY_VDC). The connections labeled R1-8 are the relay driver chip outputs; the RLY+VDC

connectio n provides access to the ULN2803A dr ive r chi p’s in ter na l back EMF prot ec tion di ode s.

Freescale

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AARRCCHHIIVVEEDD BBYY FFRREEEESSCCAALLEE SSEEMMIICCOONNDDUUCCTTOORR,, II NNCC.. 22000055

A.6 Matrix KeyPad Input A.6 Matrix KeyPad Input

The keypad input connections (visible in Figure A-1) are the upper-most eight of the 8x2 header

connection. The lower eight of the 8x2 header connection (which are not visible in Figure A- 1 ) are

used by the fa ct ory for pr ogr amming and should b e left unconnect ed.

The keypad input connections (visible in Figure A-1) are the upper-most eight of the 8x2 header

connection. The lower eight of the 8x2 header connection (which are not visible in Figure A- 1 ) are

used by the fa ct ory for pr ogr amming and should b e left unconnect ed.

A.7 Interfacing the LCD+ A.7 Interfacing the LCD+

The LCD+ can be controlled using any computer or microprocessor supporting 1200-57600 baud data

rates with a n 8,N,1 data forma t (8 data bi ts, No parity, 1 st op bi t).

The LCD+ can be controlled using any computer or microprocessor supporting 1200-57600 baud data

rates with a n 8,N,1 data forma t (8 data bi ts, No parity, 1 st op bi t).

A.8 Keypad Interface A.8 Keypad Interface

The keypad interface supports matrix k eypads up to 4x4 in size (16 keys). Instead of predefining the

keypad’s key serial data format as 0 through 15, each of the keypad’s keys is serially represented by a

user-definable byte value. This user-definable value, or “Tag”, is stored within the LCD+ EEPROM as

a 0-15 byte array. Each byte of the array corresponds to a key on the keypad (i.e., key 0 corresponds to

byte 0 of the array). W hen a key is pressed, the stored byte representation for that key number is sent

serially.

The keypad interface supports matrix k eypads up to 4x4 in size (16 keys). Instead of predefining the

keypad’s key serial data format as 0 through 15, each of the keypad’s keys is serially represented by a

user-definable byte value. This user-definable value, or “Tag”, is stored within the LCD+ EEPROM as

a 0-15 byte array. Each byte of the array corresponds to a key on the keypad (i.e., key 0 corresponds to

byte 0 of the array). W hen a key is pressed, the stored byte representation for that key number is sent

serially.

A.9 Keypad Options A.9 Keypad Options

Various keypad options are supported by six user-definable options, or “modes”. These modes are set

by sending CTRL-X, followed by the user’s command byte containing the d esired mo des. As sh own

in Table A-2, plac ing a “1” in any on e of the bi ts turns its correspo ndin g option On, and a “0” turn s it

Off

Various keypad options are supported by six user-definable options, or “modes”. These modes are set

by sending CTRL-X, followed by the user’s command byte containing the d esired mo des. As sh own

in Table A-2, plac ing a “1” in any on e of the bi ts turns its correspo ndin g option On, and a “0” turn s it

Off

Table A-2. LCD+ Keypad Options Table

Mode Byte Mode Byte Name Name Description Description

B0 “Key Beeps” Beep buzzer during each key press

B1 “Key Press Format” Sends one byte for key down and one for key up

B2 “LCD Echo” Echoes key pres s data, ASCII repres entation to LCD display

MOT

Interfacing LCDs and Porting Code 17

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Net Media’ s Serial LCD + Net Media’ s Seri al LCD+

ARC

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B

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UCTOR, INC. 2005

ARC

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UCTOR, INC. 2005

Mode Byte Mode Byte Name Name Description Description

B3 “Mask Key Presses” Displays all ke y presses as asteris ks on LCD

B4 “Auto Backlight” Turns backlight On with any key press, then turns backlight Off

4 seconds after last key press

B7 “Delayed Response” Provides a 3.0ms delay in response to a command. Required

for interfacing with BS2

Table A-3. LCD+ Control

Codes

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Control

Code Function Total Bytes Needed +

Command_Data Return

Data

Ctrl-A Cursor Home 1 Byte( 0x01) None

Ctrl-B Set/Adjust Backlight Brightness 2 Bytes (0x02) + 0--255 None

Ctrl-C Set/Adjust Contrast 2 Bytes (0x03) + 0--255 None

Ctrl-D Hi de Curso r 1 Byte (0x04) None

Ctrl-E Underline Cursor 1 B yte (0x05) None

Ctrl-F Block Cursor 1 Byte (0x06) None

Ctrl-G Sound Bell/Buzzer 1 Byte (0x07) None

Ctrl-H Backspace 1 Byte (0x08) None

Ctrl-I Horizontal Tab 1 Byte (0x09) None

Ctrl-J Line Feed 1 Byte (0x0a) None

Ctrl-K Reverse Line Feed 1 Byte (0x0b) None

Ctrl-L F orm Feed/Clear Screen 1 Byte (0x0c) None

Ctrl-M Carriage Return 1 B yte (0x0d) None

Ctrl-N Backlight On 1 Byte (0x0e) None

Ctrl-O Backlight Off 1 Byte (0x0f) None

Ctrl-P Set Cursor Position 2 Bytes (0x10) + 0--79 None

Ctrl-Q Clear Column 1 Bytes (0x11) None

Ctrl-R Set Relays 2 B yt es ( 0 x12) + 0- - 255 None

Ctrl-S Define Custom Characte r 10 Bytes (0x13) + 0--7 + 8 Bytes None

Ctrl-T Download Keypad Tags 17 Bytes (0x14) + 16 New keys None

18 Interfacing LCDs and Porting Code

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NetMedia’s Serial

LCD+

NetMedia’s Serial

LCD+

ARCHIV

T

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D

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B

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-3

F

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Control Control

Code

Code Function Function Total Bytes Needed +

Command_Data

Total Bytes Needed +

Command_Data Return Return

Data

Ctrl-U Set Baud Rate 2 Bytes (0x15) + 0--6 None

Ctrl-V Read ADC Inputs 2 Bytes (0x16) + 1--8 2 Bytes

Ctrl-W Change Bell/Buzzer Frequency 2 Bytes (0x17) + 0--255 None

Ctrl-X Set Keypad Modes 2 Bytes (0x18) + 0--255 None

Ctrl-Y Read Key pad Inp ut as Port 1 Byte (0x19) 1 Byte

Ctrl-Z Get LCD+ EEPROM Settings 1 Byte (0x20) 20 Bytes

None Display Custom Character 1 Byte (0x80) None

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MOT

Interfacing LCDs and Porting Code 19

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ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005

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OnCETM is a registered tradem ark of Motorola, Inc.

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suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and

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arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even i f such clai m alleges that

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How to reach us:

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Not Listed: Motorola Li terature Distri bution: P.O. Box 5405, Denver, Color ado 80217.

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AN1924/D

Because of an order from the United States International Trade Commission, BGA-packaged product lines and part numbers indicated here currently are not

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