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rg_i2c: Added support for PCF8575

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It's not very elegant but it should work...
This commit is contained in:
Alex Duchesne 2025-07-10 15:34:42 -04:00
parent 57a47ff77d
commit d57d455e1d
1 changed files with 29 additions and 0 deletions
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29
components/retro-go/rg_i2c.c
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@ -162,6 +162,16 @@ static const _gpio_port gpio_ports[] = {
static const _gpio_sequence gpio_init_seq[] = {};
static const _gpio_sequence gpio_deinit_seq[] = {};
#elif RG_I2C_GPIO_DRIVER == 4 // PCF8575
static const _gpio_port gpio_ports[] = {
{-1, -1, -1, -1}, // PORT 0
{-1, -1, -1, -1}, // PORT 1
};
static const _gpio_sequence gpio_init_seq[] = {};
static const _gpio_sequence gpio_deinit_seq[] = {};
static rg_gpio_mode_t PCF8575_mode = -1;
#else
#error "Unknown I2C GPIO Extender driver type!"
@ -230,18 +240,33 @@ bool rg_i2c_gpio_configure_port(int port, uint8_t mask, rg_gpio_mode_t mode)
{
if (port < 0 || port >= gpio_ports_count)
return false;
#if RG_I2C_GPIO_DRIVER == 4 // PCF8575
uint16_t temp = 0xFFFF;
if (mask != 0xFF && mode != PCF8575_mode)
RG_LOGW("PCF8575 mode cannot be set by pin. (mask is 0x%02X, expected 0xFF)", mask);
PCF8575_mode = mode;
if (mode != RG_GPIO_OUTPUT)
return rg_i2c_write(gpio_address, -1, &temp, 2) && rg_i2c_read(gpio_address, -1, &temp, 2);
return rg_i2c_write(gpio_address, -1, &gpio_output_values, 2);
#else
int direction_reg = gpio_ports[port].direction_reg;
int pullup_reg = gpio_ports[port].pullup_reg;
if (pullup_reg != -1 && !update_register(pullup_reg, mask, mode == RG_GPIO_INPUT_PULLUP ? mask : 0))
return false;
return update_register(direction_reg, mask, mode != RG_GPIO_OUTPUT ? mask : 0);
#endif
}
int rg_i2c_gpio_read_port(int port)
{
if (port < 0 || port >= gpio_ports_count)
return -1;
#if RG_I2C_GPIO_DRIVER == 4 // PCF8575
uint8_t values[2];
return rg_i2c_read(gpio_address, -1, &values, 2) ? values[port & 1] : -1;
#else
return rg_i2c_read_byte(gpio_address, gpio_ports[port].input_reg);
#endif
}
bool rg_i2c_gpio_write_port(int port, uint8_t value)
@ -249,7 +274,11 @@ bool rg_i2c_gpio_write_port(int port, uint8_t value)
if (port < 0 || port >= gpio_ports_count)
return false;
gpio_output_values[port] = value;
#if RG_I2C_GPIO_DRIVER == 4 // PCF8575
return PCF8575_mode == RG_GPIO_OUTPUT && rg_i2c_write(gpio_address, -1, &gpio_output_values, 2);
#else
return rg_i2c_write_byte(gpio_address, gpio_ports[port].output_reg, value);
#endif
}
bool rg_i2c_gpio_set_direction(int pin, rg_gpio_mode_t mode)