esp_components/zh_pcf8574
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doc: updated example

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This commit is contained in:
Alexey Zholtikov
2025-12-24 18:10:40 +03:00
parent e03c88dc5d
commit a0e7add434
1 changed files with 12 additions and 12 deletions
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24
README.md
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@@ -60,7 +60,7 @@ One expander on bus. All GPIO's as output (except P0 - input). Interrupt is enab
i2c_master_bus_handle_t i2c_bus_handle = NULL;
zh_pcf8574_handle_t pcf8574_handle = {0};
void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data); // Required only if used input GPIO interrupts.
void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data);
void print_gpio_status(const char *message, uint8_t reg)
{
@@ -86,23 +86,23 @@ void app_main(void)
.flags.enable_internal_pullup = true,
};
i2c_new_master_bus(&i2c_bus_config, &i2c_bus_handle);
esp_event_loop_create_default(); // Required only if used input GPIO interrupts.
esp_event_handler_instance_register(ZH_PCF8574, ESP_EVENT_ANY_ID, &zh_pcf8574_event_handler, NULL, NULL); // Required only if used input GPIO interrupts.
zh_pcf8574_init_config_t config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
config.i2c_handle = i2c_bus_handle;
config.i2c_address = 0x38;
config.p0_gpio_work_mode = true; // Required only for input GPIO.
config.interrupt_gpio = GPIO_NUM_14; // Required only if used input GPIO interrupts.
zh_pcf8574_init(&config, &pcf8574_handle);
esp_event_loop_create_default();
esp_event_handler_instance_register(ZH_PCF8574, ESP_EVENT_ANY_ID, &zh_pcf8574_event_handler, NULL, NULL);
zh_pcf8574_init_config_t pcf8574_init_config = ZH_PCF8574_INIT_CONFIG_DEFAULT();
pcf8574_init_config.i2c_handle = i2c_bus_handle;
pcf8574_init_config.i2c_address = 0x38;
pcf8574_init_config.p0_gpio_work_mode = true;
pcf8574_init_config.interrupt_gpio = GPIO_NUM_14;
zh_pcf8574_init(&pcf8574_init_config, &pcf8574_handle);
uint8_t reg = 0;
zh_pcf8574_read(&pcf8574_handle, &reg);
print_gpio_status("GPIO status: ", reg);
printf("Set P7 to 1, P1 to 1 and P0 to 0.\n");
zh_pcf8574_write(&pcf8574_handle, 0b10000010); // GPIO P0 will not be changed because it is operating in input mode.
zh_pcf8574_write(&pcf8574_handle, 0b10000010);
zh_pcf8574_read(&pcf8574_handle, &reg);
print_gpio_status("GPIO status: ", reg);
printf("Sets P0 to 0.\n");
zh_pcf8574_write_gpio(&pcf8574_handle, 0, false); // GPIO P0 will not be changed because it is operating in input mode.
zh_pcf8574_write_gpio(&pcf8574_handle, 0, false);
bool gpio = 0;
zh_pcf8574_read_gpio(&pcf8574_handle, 0, &gpio);
printf("P0 status: %d.\n", gpio);
@@ -128,7 +128,7 @@ void app_main(void)
}
}
void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data) // Required only if used input GPIO interrupts.
void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
{
zh_pcf8574_event_on_isr_t *event = event_data;
printf("Interrupt happened on device address 0x%02X on GPIO number %d at level %d.\n", event->i2c_address, event->gpio_number, event->gpio_level);