alexey.zholtikov/zh_pcf8574
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feat: added interrupt for high level

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This commit is contained in:
Alexey Zholtikov 2025-06-07 08:39:46 +03:00
parent 46019d0141
commit 9ead86ba5e
4 changed files with 13 additions and 7 deletions
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4
README.md
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@ -15,7 +15,7 @@
1. Enable interrupt support only if input GPIO's are used.
2. All the INT GPIO's on the extenders must be connected to the one GPIO on ESP.
3. The input GPIO's are always pullup to the power supply. They must be connected to ground to trigger an interrupt.
3. The input GPIO's are always pullup to the power supply.
## Dependencies
@ -133,6 +133,6 @@ 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.
{
zh_pcf8574_event_on_isr_t *event = event_data;
printf("Interrupt happened on device address 0x%02X on GPIO number %d.\n", event->i2c_address, event->gpio_number);
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);
}
```

1
include/zh_pcf8574.h
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@ -73,6 +73,7 @@ extern "C"
{
uint8_t i2c_address; // The i2c address of PCF8574 expander that caused the interrupt.
uint8_t gpio_number; // The GPIO that caused the interrupt.
bool gpio_level; // The GPIO level that caused the interrupt.
} zh_pcf8574_event_on_isr_t;
/**

2
version.txt
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@ -1 +1 @@
1.2.0
1.3.0

13
zh_pcf8574.c
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@ -223,8 +223,9 @@ static void IRAM_ATTR _zh_pcf8574_isr_processing_task(void *pvParameter)
zh_pcf8574_event_on_isr_t event = {0};
event.i2c_address = handle->i2c_address;
event.gpio_number = 0xFF;
uint8_t reg_temp = 0;
esp_err_t err = _zh_pcf8574_read_register(handle, &reg_temp);
uint8_t old_reg = handle->gpio_status;
uint8_t new_reg = 0;
esp_err_t err = _zh_pcf8574_read_register(handle, &new_reg);
if (err != ESP_OK)
{
ZH_PCF8574_LOGE_ERR("PCF8574 isr processing failed. Failed to read expander register.", err);
@ -232,9 +233,13 @@ static void IRAM_ATTR _zh_pcf8574_isr_processing_task(void *pvParameter)
}
for (uint8_t j = 0; j <= 7; ++j)
{
if (((handle->gpio_work_mode & _gpio_matrix[j]) != 0) && ((reg_temp & _gpio_matrix[j]) == 0))
if ((handle->gpio_work_mode & _gpio_matrix[j]) != 0)
{
event.gpio_number = j;
if ((old_reg & _gpio_matrix[j]) != (new_reg & _gpio_matrix[j]))
{
event.gpio_number = j;
event.gpio_level = new_reg & _gpio_matrix[j];
}
break;
}
}