gpio.c

File for initalizate a PH320240 LCD usign AVR32 Studio and a AP7000 controller

// Blink pin 3 on port B at 1 Hz
// Just add an LED and see the light! ;)
//
//Created by Dingo_aus, 7 January 2009
//email: dingo_aus [at] internode <dot> on /dot/ net
//
//Created in AVR32 Studio (version 2.0.2) running on Ubuntu 8.04

#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

FILE *pb0,*pb1,*pb2; 
//create a variable to store whether we are sending a '1' or a '0'
char set_value[4]; 

void inicializar (void){
	//**********Inicializa PB0 como salida
	//Using sysfs we need to write "32" to /sys/class/gpio/export
	//This will create the folder /sys/class/gpio/gpio32
	if ((pb0 = fopen("/sys/class/gpio/export", "ab")) == NULL)
	{
		printf("Cannot open export file.\n");
		exit(1);
	}
	
	//Set pointer to begining of the file
	rewind(pb0);
	//Write our value of "32" to the file
	strcpy(set_value,"32");
	fwrite(&set_value, sizeof(char), 2, pb0);
	fclose(pb0);
	printf("...export file accessed, new pin now accessible\n");
	
	//SET DIRECTION
	//Open the LED's sysfs file in binary for reading and writing, store file pointer in fp
	if ((pb0 = fopen("/sys/class/gpio/gpio32/direction", "rb+")) == NULL)
	{
		printf("Cannot open direction file.\n");
		exit(1);
	}
	//Set pointer to begining of the file
	rewind(pb0);
	//Write our value of "out" to the file
	strcpy(set_value,"out");
	fwrite(&set_value, sizeof(char), 3, pb0);
	fclose(pb0);
	printf("...direction set to output\n");
	
	//**********Inicializa PB1 como salida
	//Using sysfs we need to write "33" to /sys/class/gpio/export
	//This will create the folder /sys/class/gpio/gpio33
	if ((pb1 = fopen("/sys/class/gpio/export", "ab")) == NULL)
	{
		printf("Cannot open export file.\n");
		exit(1);
	}
	
	//Set pointer to begining of the file
	rewind(pb1);
	//Write our value of "33" to the file
	strcpy(set_value,"33");
	fwrite(&set_value, sizeof(char), 2, pb1);
	fclose(pb1);
	printf("...export file accessed, new pin now accessible\n");
	
	//SET DIRECTION
	//Open the LED's sysfs file in binary for reading and writing, store file pointer in fp
	if ((pb1 = fopen("/sys/class/gpio/gpio33/direction", "rb+")) == NULL)
	{
		printf("Cannot open direction file.\n");
		exit(1);
	}
	//Set pointer to begining of the file
	rewind(pb1);
	//Write our value of "out" to the file
	strcpy(set_value,"out");
	fwrite(&set_value, sizeof(char), 3, pb1);
	fclose(pb1);
	printf("...direction set to output\n");
	
	//**********Inicializa PB2 como salida
	//Using sysfs we need to write "34" to /sys/class/gpio/export
	//This will create the folder /sys/class/gpio/gpio34
	if ((pb2 = fopen("/sys/class/gpio/export", "ab")) == NULL)
	{
		printf("Cannot open export file.\n");
		exit(1);
	}
	
	//Set pointer to begining of the file
	rewind(pb2);
	//Write our value of "34" to the file
	strcpy(set_value,"34");
	fwrite(&set_value, sizeof(char), 2, pb2);
	fclose(pb2);
	printf("...export file accessed, new pin now accessible\n");
	
	//SET DIRECTION
	//Open the LED's sysfs file in binary for reading and writing, store file pointer in fp
	if ((pb2 = fopen("/sys/class/gpio/gpio34/direction", "rb+")) == NULL)
	{
		printf("Cannot open direction file.\n");
		exit(1);
	}
	//Set pointer to begining of the file
	rewind(pb2);
	//Write our value of "out" to the file
	strcpy(set_value,"out");
	fwrite(&set_value, sizeof(char), 3, pb2);
	fclose(pb2);
	printf("...direction set to output\n");		
}

void escribir_pb0 (char bit){  	//escribe bit (que es un char "1") a donde indique el pointer
		
	if ((pb0 = fopen("/sys/class/gpio/gpio32/value", "rb+")) == NULL)
		{
			printf("Cannot open value file.\n");
			exit(1);
		}	
		strcpy(set_value,"1");
		//Set pointer to begining of the file
		rewind(pb0);
		//Write our value of "1" to the file 
		strcpy(set_value,&bit);
		fwrite(&set_value, sizeof(char), 1, pb0);
		fclose(pb0);
		//printf("...enable (pb0) set to %c \n",bit);
}

void escribir_pb1 (char bit){  	//escribe bit (que es un char "1") a donde indique el pointer
		
	if ((pb1 = fopen("/sys/class/gpio/gpio33/value", "rb+")) == NULL)
		{
			printf("Cannot open value file.\n");
			exit(1);
		}	
		strcpy(set_value,"1");
		//Set pointer to begining of the file
		rewind(pb1);
		//Write our value of "1" to the file 
		strcpy(set_value,&bit);
		fwrite(&set_value, sizeof(char), 1, pb1);
		fclose(pb1);
		//printf("...clock (pb1) set to %c \n",bit);
}

void escribir_pb2 (char bit){  	//escribe bit (que es un char "1") a donde indique el pointer
		
	if ((pb2 = fopen("/sys/class/gpio/gpio34/value", "rb+")) == NULL)
		{
			printf("Cannot open value file.\n");
			exit(1);
		}	
		strcpy(set_value,"1");
		//Set pointer to begining of the file
		rewind(pb2);
		//Write our value of "1" to the file 
		strcpy(set_value,&bit);
		fwrite(&set_value, sizeof(char), 1, pb2);
		fclose(pb2);
		//printf("...data (pb2) set to %c \n",bit);
}
	
void reloj (void){
	escribir_pb1('0');
	usleep(10);
	escribir_pb1('1');
	usleep(10);
}

void rs_on(void){  	//envia 8 bits, dejando rs on
	int i=0,temp=0;
	int reg=0x72;
	escribir_pb0('0');
	usleep(1);
	for( i=0; i<8; i++){
		temp=(reg<<i);
		if ((temp & 0x80) == 0x80){
			escribir_pb2('1');
			//printf("Pin out -> 0x01\n");
		}else{
			escribir_pb2('0');
			//printf("Pin out -> 0x00\n");
		}
		reloj();
	}
}

void rs_off(void){  	//envia 8 bits, dejando rs off
	int i=0,temp=0;
	int reg=0x70;
	escribir_pb0('0');
	for( i=0; i<8; i++){
		temp=(reg<<i);
		if ((temp & 0x80) == 0x80){
			escribir_pb2('1');
			//printf("Pin out -> 0x01\n");
		}else{
			escribir_pb2('0');
			//printf("Pin out -> 0x00\n");
		}
		reloj();
	}
}

void write_reg(int reg){  	//envia 16 bits, formato write_reg(0x0000) con rs_off
	int i=0,temp=0;
	printf("write_reg 0x%04X \n",reg);
	rs_off();
	for( i=0; i<16; i++){
		temp=(reg<<i);
		if ((temp & 0x8000) == 0x8000){
			escribir_pb2('1');
			//printf("Pin out -> 0x01\n");
		}else{
			escribir_pb2('0');
			//printf("Pin out -> 0x00\n");
		}
		reloj();
	}
	usleep(10);
	escribir_pb2('1');
	escribir_pb0('1');
	usleep(100);
}

void write_dat(int reg){  	//envia 16 bits, formato write_reg(0x0000) con rs_on
	int i=0,temp=0;
	printf("write_dat 0x%04X \n",reg);
	rs_on();
	for( i=0; i<16; i++){
		temp=(reg<<i);
		if ((temp & 0x8000) == 0x8000){
			escribir_pb2('1');
			//printf("Pin out -> 0x01\n");
		}else{
			escribir_pb2('0');
			//printf("Pin out -> 0x00\n");
		}
		reloj();
	}
	usleep(10);
	escribir_pb2('1');
	escribir_pb0('1');
	usleep(100);
}

int main(int argc, char** argv)
{

	printf("\n**********************************\n"
			"*  Bienvenido, Programa para     *\n"
			"*  ...inicializar la PH320240    *\n"
			"*  ...Camilo Guevara G.          *\n"
			"**********************************\n");
	
	inicializar();
	
	//Run an infinite loop - will require Ctrl-C to exit this program
/*	while(1)
	{
		//Set it so we know the starting value in case something above doesn't leave it as 1
		strcpy(set_value,"1");
		
		if ((pb0 = fopen("/sys/class/gpio/gpio32/value", "rb+")) == NULL)
		{
			printf("Cannot open value file.\n");
			exit(1);
		}	
		
		reloj();		
		sleep(1);
	}
	return 0;*/
	
	escribir_pb2('1');
	escribir_pb0('1');
	escribir_pb1('1');
	usleep(1000000);
	

	write_reg(0x0001);
	write_dat(0x7300);
	write_reg(0x0002);
	write_dat(0x0200);
	write_reg(0x0003);
	write_dat(0x6364);
	write_reg(0x0004);
	write_dat(0x04C7);
	write_reg(0x0005);
	write_dat(0xFC80);
	write_reg(0x000A); //Contrast/Brightness control;
	write_dat(0x4008);
	write_reg(0x000D); //Power control(2);
	write_dat(0x3229);
	write_reg(0x000E); //Power control(3);VOML
	write_dat(0x3200);
	write_reg(0x001E); //Power control(4);COMH
	write_dat(0x00D2); // lo cambie.. le original es D2 
	return 0;
}