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rg_i2c: Added function rg_i2c_gpio_configure_port

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This commit is contained in:
Alex Duchesne 2025-06-24 23:58:42 -04:00
parent 51e74f6257
commit 1454089ba8
2 changed files with 21 additions and 13 deletions
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28
components/retro-go/rg_i2c.c
View File

@ -127,8 +127,6 @@ bool rg_i2c_write_byte(uint8_t addr, uint8_t reg, uint8_t value)
#ifdef RG_I2C_GPIO_DRIVER
static bool gpio_initialized = false;
static uint8_t gpio_address = 0x00;
#if RG_I2C_GPIO_DRIVER == 1 // AW9523
@ -164,6 +162,9 @@ static const uint8_t gpio_deinit_sequence[][2] = {};
#endif
static uint8_t gpio_address = RG_I2C_GPIO_ADDR;
static bool gpio_initialized = false;
bool rg_i2c_gpio_init(void)
{
@ -173,20 +174,18 @@ bool rg_i2c_gpio_init(void)
if (!i2c_initialized && !rg_i2c_init())
return false;
gpio_address = RG_I2C_GPIO_ADDR;
gpio_initialized = true;
// Configure extender-specific registers if needed (disable open-drain, interrupts, inversion, etc)
for (size_t i = 0; i < RG_COUNT(gpio_init_sequence); ++i)
rg_i2c_write_byte(gpio_address, gpio_init_sequence[i][0], gpio_init_sequence[i][1]);
// Now set all pins of all ports as inputs and clear output latches
for (size_t i = 0; i < RG_COUNT(gpio_direction_regs); ++i)
rg_i2c_write_byte(gpio_address, gpio_direction_regs[i], 0xFF);
rg_i2c_gpio_configure_port(i, 0xFF, RG_GPIO_INPUT);
for (size_t i = 0; i < RG_COUNT(gpio_output_regs); ++i)
rg_i2c_write_byte(gpio_address, gpio_output_regs[i], 0x00);
rg_i2c_gpio_write_port(i, 0x00);
RG_LOGI("GPIO Extender ready (driver:%d, addr:0x%02X).", RG_I2C_GPIO_DRIVER, gpio_address);
gpio_initialized = true;
return true;
}
@ -202,11 +201,13 @@ bool rg_i2c_gpio_deinit(void)
return true;
}
bool rg_i2c_gpio_set_direction(int pin, rg_gpio_mode_t mode)
bool rg_i2c_gpio_configure_port(int port, uint8_t mask, rg_gpio_mode_t mode)
{
uint8_t reg = gpio_direction_regs[(pin >> 3) & 1], mask = 1 << (pin & 7);
uint8_t val = rg_i2c_read_byte(gpio_address, reg);
return rg_i2c_write_byte(gpio_address, reg, mode ? (val | mask) : (val & ~mask));
uint8_t reg = gpio_direction_regs[port & 1];
uint8_t value = rg_i2c_read_byte(gpio_address, reg) & ~mask;
if (mode == RG_GPIO_INPUT)
value |= mask;
return rg_i2c_write_byte(gpio_address, reg, value);
}
uint8_t rg_i2c_gpio_read_port(int port)
@ -219,6 +220,11 @@ bool rg_i2c_gpio_write_port(int port, uint8_t value)
return rg_i2c_write_byte(gpio_address, gpio_output_regs[port & 1], value);
}
bool rg_i2c_gpio_set_direction(int pin, rg_gpio_mode_t mode)
{
return rg_i2c_gpio_configure_port(pin >> 3, 1 << (pin & 7), mode);
}
int rg_i2c_gpio_get_level(int pin)
{
return (rg_i2c_gpio_read_port(pin >> 3) >> (pin & 7)) & 1;

6
components/retro-go/rg_i2c.h
View File

@ -23,8 +23,10 @@ typedef enum
bool rg_i2c_gpio_init(void);
bool rg_i2c_gpio_deinit(void);
bool rg_i2c_gpio_configure_port(int port, uint8_t mask, rg_gpio_mode_t mode);
uint8_t rg_i2c_gpio_read_port(int port);
bool rg_i2c_gpio_write_port(int port, uint8_t value);
// For the following functions `pin` is calculated as such: (port_num * 8) + port_pin_num
bool rg_i2c_gpio_set_direction(int pin, rg_gpio_mode_t mode);
int rg_i2c_gpio_get_level(int pin);
bool rg_i2c_gpio_set_level(int pin, int level);
uint8_t rg_i2c_gpio_read_port(int port);
bool rg_i2c_gpio_write_port(int port, uint8_t value);