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tca6416a.c
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tca6416a.c
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//
// TCA6416A I2C GPIO routines
// (c) woytekm
//
//
//
#include <stdio.h>
#include <stdint.h>
#include "tca6416a.h"
uint8_t tca6416a_read_gpio(int i2cdev, uint8_t ic_addr, uint8_t gpio)
{
unsigned char in_bank, out_bank, current_bank_state;
if((gpio > 7) && (gpio <= TCA6416A_MAX_GPIO)) // bank 1
{
gpio -= 8; // shift GPIO number for bank 1
in_bank = TCA6416A_INPUT_BANK_1;
}
else if((gpio >= 0) && (gpio < 8))
{
in_bank = TCA6416A_INPUT_BANK_0;
}
else
return -1;
get_i2c_register(i2cdev, ic_addr, in_bank, ¤t_bank_state);
if(current_bank_state & (1 << gpio))
return 1;
else
return 0;
}
uint8_t tca6416a_out_gpio(int i2cdev, uint8_t ic_addr, uint8_t gpio, uint8_t state)
{
unsigned char in_bank, out_bank, *current_bank_state;
if((gpio > 7) && (gpio <= TCA6416A_MAX_GPIO)) // bank 1
{
gpio -= 8; // shift GPIO number for bank 1
out_bank = TCA6416A_OUTPUT_BANK_1;
current_bank_state = &input_regs_bank_1;
}
else if((gpio >= 0) && (gpio < 8))
{
out_bank = TCA6416A_OUTPUT_BANK_0;
current_bank_state = &input_regs_bank_0;
}
else
return -1;
if(state == 1)
{
*current_bank_state |= (1 << gpio);
set_i2c_register(i2cdev, ic_addr, out_bank, *current_bank_state);
}
else
{
*current_bank_state &= ~(1 << gpio);
set_i2c_register(i2cdev, ic_addr, out_bank, *current_bank_state);
}
return 0;
}
uint8_t tca6416a_set_gpio(int i2cdev, uint8_t ic_addr, uint8_t gpio, uint8_t mode)
{
unsigned char in_bank, out_bank, *current_bank_state;
if((gpio > 7) && (gpio <= TCA6416A_MAX_GPIO)) // bank 1
{
gpio -= 8; // shift GPIO number for bank 1
out_bank = TCA6416A_CONFIG_BANK_1;
current_bank_state = &input_regs_bank_1;
}
else if((gpio >= 0) && (gpio < 8))
{
out_bank = TCA6416A_CONFIG_BANK_0;
current_bank_state = &input_regs_bank_0;
}
else
return -1;
if(mode == TCA6416A_GPIO_IN)
{
*current_bank_state |= (1 << gpio);
set_i2c_register(i2cdev, ic_addr, out_bank, *current_bank_state);
}
else if(mode == TCA6416A_GPIO_OUT)
{
*current_bank_state &= ~(1 << gpio);
set_i2c_register(i2cdev, ic_addr, out_bank, *current_bank_state);
}
return 0;
}
uint8_t tca6416a_init(int i2cdev, uint8_t ic_addr)
{
get_i2c_register(i2cdev, ic_addr, TCA6416A_INPUT_BANK_0, &output_regs_bank_0);
get_i2c_register(i2cdev, ic_addr, TCA6416A_INPUT_BANK_1, &output_regs_bank_1);
get_i2c_register(i2cdev, ic_addr, TCA6416A_POLARITY_BANK_0, &polarity_regs_bank_0);
get_i2c_register(i2cdev, ic_addr, TCA6416A_POLARITY_BANK_1, &polarity_regs_bank_1);
get_i2c_register(i2cdev, ic_addr, TCA6416A_CONFIG_BANK_0, &config_regs_bank_0);
get_i2c_register(i2cdev, ic_addr, TCA6416A_CONFIG_BANK_1, &config_regs_bank_1);
return 0;
}