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rg_i2c: Added output latch cache to be able to toggle bits faster

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This will also be needed for PCF8575
This commit is contained in:
Alex Duchesne 2025-07-04 19:10:22 -04:00
parent 950667456a
commit 4136437c9d
1 changed files with 5 additions and 2 deletions
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7
components/retro-go/rg_i2c.c
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@ -169,6 +169,7 @@ static const _gpio_sequence gpio_deinit_seq[] = {};
#endif
static const size_t gpio_ports_count = RG_COUNT(gpio_ports);
static uint8_t gpio_output_values[gpio_ports_count];
static uint8_t gpio_address = RG_I2C_GPIO_ADDR;
static bool gpio_initialized = false;
@ -247,6 +248,7 @@ 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;
return rg_i2c_write_byte(gpio_address, gpio_ports[port].output_reg, value);
}
@ -262,7 +264,8 @@ int rg_i2c_gpio_get_level(int pin)
bool rg_i2c_gpio_set_level(int pin, int level)
{
int reg = gpio_ports[(pin >> 3) % gpio_ports_count].output_reg, mask = 1 << (pin & 7);
return update_register(reg, mask, level ? mask : 0);
uint8_t port = (pin >> 3) % gpio_ports_count, mask = 1 << (pin & 7);
uint8_t value = (gpio_output_values[port] & ~mask) | (level ? mask : 0);
return rg_i2c_gpio_write_port(port, value);
}
#endif