Hi, I have been looking at a few different resources both on here and elsewhere on the internet about 4-bit LCD interfacing. I am using the SPI with the microcontroller stated in the title. I have managed to get the SPI working properly and the correct bits show up on the output of the 74HC595 serial in, parallel out shift register.
I can not for the life of me get the LCD to initialize or do anything. 
when I plug the board in to do multilink debugging with codewarrior, the first of the two 8-digit lines fills all dark and the second line is clear.
the initialize logic and data sending techniques I have come up with is loosely based off of this site.
Anyway here is my code. If anyone has any ideas please let me know 
#include <hidef.h> /* common defines and macros */#include "derivative.h" /* derivative-specific definitions */void SPI_Initialize(void);void SPI_Send(unsigned char data);void LCD_Initialize(void);void LCD_SendCommand(unsigned char data);void LCD_SendCharacter(unsigned char data);void Delay(unsigned int time); void Delay3us(unsigned int time);void main(void) { SPI_Initialize(); LCD_Initialize(); while(1) { LCD_SendCharacter(0x4F); }}void LCD_Initialize(void){ // wait 20ms for LCD to turn on Delay(21); SPI_Send(0x83); SPI_Send(0x03); Delay(10); SPI_Send(0x83); SPI_Send(0x03); Delay(1); SPI_Send(0x83); SPI_Send(0x03); Delay(1); SPI_Send(0x82); SPI_Send(0x02); Delay(1); // Write 08 hex (don't shift display, hide cursor) LCD_SendCommand(0x08); // Write 01 hex (clear and home display) LCD_SendCommand(0x01); // Write 06 hex (move cursor right) LCD_SendCommand(0x06); // Write 0C hex (turn on display) LCD_SendCommand(0x0F);}void LCD_SendCharacter(unsigned char data){ // break up data for transfer volatile unsigned char low = data&0x0F; volatile unsigned char high = (data&0xF0)>>4; // set enable low SPI_Send(high); // set enable bit to 1 SPI_Send(high|0xC0); // set enable low SPI_Send(high); // Delay Delay3us(200); // send low byte SPI_Send(low); // set enable bit to 1 SPI_Send(low|0xC0); // clear enable bit SPI_Send(low); // delay 5ms Delay(1);}void LCD_SendCommand(unsigned char data){ // break up data for transfer volatile unsigned char low = data&0x0F; volatile unsigned char high = (data&0xF0)>>4; // send high byte of data SPI_Send(high); // set enable bit to 1 SPI_Send(high|0x80); // set enable low SPI_Send(high); // delay 5ms Delay(5); // clear enable bit SPI_Send(low); // set enable bit to 1 SPI_Send(low|0x80); // clear enable bit SPI_Send(low);}void SPI_Initialize(void) { char clear; // route SPI to port M MODRR_MODRR4 = 1; DDRM = 0b00111000; // baud rate = 520.83 kHz SPI0BR = 0x23; // SPI control register 2 SPI0CR2 = 0x10; // enable SPI and set to master mode SPI0CR1 = 0x52; // clear flag clear = SPI0SR; clear = SPI0DR; }void SPI_Send(unsigned char data){ char clear; // write to data register SPI0DR = data; // wait until ready while (SPI0SR_SPIF == 0) { // wait for flag } // reset flag clear = SPI0SR; clear = SPI0DR;}void Delay(unsigned int time) { unsigned int i; unsigned int j; for (i = 0; i < time; i++) { for (j = 0; j < 328; j++) { } }}void Delay3us(unsigned int time){ int j; for (j = 0; j < time; j++) { }}
Thanks again! I have implemented all of your suggestions and looked at the pdf.
but still....nothing
It must have something to do with the initialization because it still just displays a single filled in line, the clear display command does not seem to work at all. Does the enable line need to be high during initialization?
anyway here is my current code. Hopefully it is just some glaring mistake.
#include <hidef.h> /* common defines and macros */#include "derivative.h" /* derivative-specific definitions */void SPI_Initialize(void);void SPI_Send(unsigned char data);void LCD_Initialize(void);void LCD_SendCommand(unsigned char data);void LCD_SendCharacter(unsigned char data);void Delay(unsigned int time); void Delay3us(unsigned int time);void main(void) { SPI_Initialize(); LCD_Initialize(); while(1) { LCD_SendCharacter(0x4F); }}void LCD_Initialize(void){ // wait 20ms for LCD to turn on Delay(21); //SPI_Send(0x83); SPI_Send(0x03); Delay(10); //SPI_Send(0x83); SPI_Send(0x03); Delay(1); //SPI_Send(0x83); SPI_Send(0x03); //Delay(1); //SPI_Send(0x82); SPI_Send(0x02); SPI_Send(0x02); // 2 lines, 5x7 font SPI_Send(0x08); LCD_SendCommand(0x08); // Write 01 hex (clear and home display) LCD_SendCommand(0x01); // Write 06 hex (move cursor right) LCD_SendCommand(0x06); // Write 0C hex (turn on display) LCD_SendCommand(0x0F);}void LCD_SendCharacter( unsigned char data){ // Split data into two nybbles unsigned char low = data & 0x0F; unsigned char high = (data & 0xF0) >> 4; // Send high nybble SPI_Send( high | 0x40); // RS = 1, E = 0 SPI_Send( high | 0xC0); // RS = 1, E = 1 SPI_Send( high | 0x40); // RS = 1, E = 0 // Send low nybble SPI_Send( low | 0x40); // RS = 1, E = 0 SPI_Send( low | 0xC0); // RS = 1, E = 1 SPI_Send( low | 0x40); // RS = 1, E = 0 Delay(2); // delay 1ms}void LCD_SendCommand(unsigned char data){ // break up data for transfer volatile unsigned char low = data&0x0F; volatile unsigned char high = (data&0xF0)>>4; // send high byte of data SPI_Send(high); // set enable bit to 1 SPI_Send(high|0x80); // set enable low SPI_Send(high); // delay 5ms //Delay(1); // clear enable bit SPI_Send(low); // set enable bit to 1 SPI_Send(low|0x80); // clear enable bit SPI_Send(low); // Delay 2ms in between commands Delay(2);}void SPI_Initialize(void) { char clear; // route SPI to port M MODRR_MODRR4 = 1; DDRM = 0b00111000; // baud rate = 520.83 kHz SPI0BR = 0x23; // SPI control register 2 SPI0CR2 = 0x10; // enable SPI and set to master mode SPI0CR1 = 0x52; // clear flag clear = SPI0SR; clear = SPI0DR; }void SPI_Send(unsigned char data){ char clear; // write to data register SPI0DR = data; // wait until ready while (SPI0SR_SPIF == 0) { // wait for flag } // reset flag clear = SPI0SR; clear = SPI0DR;}void Delay(unsigned int time) { unsigned int i; unsigned int j; for (i = 0; i < time; i++) { for (j = 0; j < 328; j++) { } }}void Delay3us(unsigned int time){ int j; for (j = 0; j < time; j++) { }}
