Sanchayan Maity
f815cdce4b
Preliminary commit with the following projects in Eclipse 1. gtkmm Hello World 2. PCF8574 I2C GPIO Expander 3. PCF8591 I2C A-D & D-A Converter 4. SPI based OLED Display with SSD1306 controller Library Dependencies 1. Gtk 2. Gtkmm 3. libsoc TODO: Documentation and cleanup
136 lines
2.4 KiB
C
136 lines
2.4 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <libsoc_i2c.h>
|
|
|
|
/* PCF8574 I2C Address on Pioneer 600 */
|
|
#define PCF8574_ADDRESS 0x20
|
|
|
|
static uint8_t RS = 0x01;
|
|
static uint8_t EN = 0x04;
|
|
static uint8_t BL = 0x08;
|
|
|
|
/*
|
|
* libsoc i2c API Documentation: http://jackmitch.github.io/libsoc/c/i2c/#i2c
|
|
*/
|
|
|
|
int pulse_enable(i2c *i2c, uint8_t data)
|
|
{
|
|
uint32_t ret;
|
|
uint8_t buf[4] = {0};
|
|
|
|
buf[0] = data | EN;
|
|
ret = libsoc_i2c_write(i2c, buf, 1);
|
|
if (ret == EXIT_FAILURE)
|
|
return ret;
|
|
|
|
usleep(1);
|
|
|
|
buf[0] = data & ~EN;
|
|
ret = libsoc_i2c_write(i2c, buf, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pcf8574_write_cmd4(i2c *i2c, uint8_t command)
|
|
{
|
|
uint32_t ret;
|
|
uint8_t buf[4] = {0};
|
|
|
|
buf[0] = command | BL;
|
|
ret = libsoc_i2c_write(i2c, buf, 1);
|
|
if (ret == EXIT_FAILURE)
|
|
return ret;
|
|
|
|
ret = pulse_enable(i2c, command | BL);
|
|
if (ret == EXIT_FAILURE)
|
|
perror("Pulse enable failed\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pcf8574_write_cmd8(i2c *i2c, uint8_t command)
|
|
{
|
|
uint32_t ret;
|
|
uint8_t command_H = command & 0xf0;
|
|
uint8_t command_L = (command << 4) & 0xf0;
|
|
|
|
ret = pcf8574_write_cmd4(i2c, command_H);
|
|
if (ret == EXIT_FAILURE) {
|
|
perror("Failed to write command high 4 bits");
|
|
return ret;
|
|
}
|
|
|
|
ret = pcf8574_write_cmd4(i2c, command_L);
|
|
if (ret == EXIT_FAILURE) {
|
|
perror("Failed to write command low 4 bits");
|
|
return ret;
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
int pcf8574_write_data4(i2c *i2c, uint8_t data)
|
|
{
|
|
uint32_t ret;
|
|
uint8_t buf[4] = {0};
|
|
|
|
buf[0] = data | RS | BL;
|
|
ret = libsoc_i2c_write(i2c, buf, 1);
|
|
if (ret == EXIT_FAILURE)
|
|
return ret;
|
|
|
|
ret = pulse_enable(i2c, data | RS | BL);
|
|
if (ret == EXIT_FAILURE)
|
|
perror("Pulse enable failed\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pcf8574_write_data8(i2c *i2c, uint8_t data)
|
|
{
|
|
uint8_t ret;
|
|
uint8_t data_H = data & 0xf0;
|
|
uint8_t data_L = (data << 4) & 0xf0;
|
|
|
|
ret = pcf8574_write_data4(i2c, data_H);
|
|
if (ret == EXIT_FAILURE) {
|
|
perror("Failed to write data high 4 bits");
|
|
return ret;
|
|
}
|
|
|
|
ret = pcf8574_write_data4(i2c, data_L);
|
|
if (ret == EXIT_FAILURE) {
|
|
perror("Failed to write data low 4 bits");
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
i2c* pcf8574_init(uint8_t i2c_bus, uint8_t i2c_address)
|
|
{
|
|
return libsoc_i2c_init(i2c_bus, i2c_address);
|
|
}
|
|
|
|
int pcf8574_close(i2c *i2c)
|
|
{
|
|
return libsoc_i2c_free(i2c);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
i2c *i2c_pcf8574;
|
|
|
|
i2c_pcf8574 = pcf8574_init(0, PCF8574_ADDRESS);
|
|
pcf8574_write_data8(i2c_pcf8574, 0xff);
|
|
|
|
pcf8574_close(i2c_pcf8574);
|
|
|
|
return 0;
|
|
}
|