200 lines
8.0 KiB
C
200 lines
8.0 KiB
C
#include "zh_avr_pcf8574.h"
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static uint8_t _interrupt_gpio = 0xFF;
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static SemaphoreHandle_t _interrupt_semaphore = NULL;
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static uint8_t _gpio_matrix[8] = {AVR_BIT0, AVR_BIT1, AVR_BIT2, AVR_BIT3, AVR_BIT4, AVR_BIT5, AVR_BIT6, AVR_BIT7};
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static zh_avr_vector_t _vector = {0};
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static avr_err_t _zh_avr_pcf8574_validate_config(const zh_avr_pcf8574_init_config_t *config);
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static avr_err_t _zh_avr_pcf8574_configure_i2c_device(const zh_avr_pcf8574_init_config_t *config, zh_avr_pcf8574_handle_t *handle);
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static avr_err_t _zh_avr_pcf8574_configure_interrupts(const zh_avr_pcf8574_init_config_t *config, zh_avr_pcf8574_handle_t handle);
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static void _zh_avr_pcf8574_isr_processing_task(void *pvParameter);
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static avr_err_t _zh_avr_pcf8574_read_register(zh_avr_pcf8574_handle_t *handle, uint8_t *reg);
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static avr_err_t _zh_avr_pcf8574_write_register(zh_avr_pcf8574_handle_t *handle, uint8_t reg);
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avr_err_t zh_avr_pcf8574_init(const zh_avr_pcf8574_init_config_t *config, zh_avr_pcf8574_handle_t *handle)
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{
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ZH_ERROR_CHECK(handle != NULL, AVR_ERR_INVALID_ARG);
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ZH_ERROR_CHECK(handle->is_initialized == false, AVR_ERR_INVALID_STATE);
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avr_err_t err = _zh_avr_pcf8574_validate_config(config);
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ZH_ERROR_CHECK(err == AVR_OK, err);
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err = _zh_avr_pcf8574_configure_i2c_device(config, handle);
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ZH_ERROR_CHECK(err == AVR_OK, err);
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err = _zh_avr_pcf8574_write_register(handle, handle->gpio_work_mode);
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if (err != AVR_OK)
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{
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handle->is_initialized = false;
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return err;
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}
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if (config->interrupt_gpio != 0xFF && handle->gpio_work_mode != 0)
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{
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err = _zh_avr_pcf8574_configure_interrupts(config, *handle);
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if (err != AVR_OK)
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{
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handle->is_initialized = false;
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return err;
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}
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}
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handle->is_initialized = true;
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return AVR_OK;
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}
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avr_err_t zh_avr_pcf8574_read(zh_avr_pcf8574_handle_t *handle, uint8_t *reg)
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{
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return _zh_avr_pcf8574_read_register(handle, reg);
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}
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avr_err_t zh_avr_pcf8574_write(zh_avr_pcf8574_handle_t *handle, uint8_t reg)
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{
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return _zh_avr_pcf8574_write_register(handle, (reg | handle->gpio_work_mode));
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}
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avr_err_t zh_avr_pcf8574_reset(zh_avr_pcf8574_handle_t *handle)
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{
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return _zh_avr_pcf8574_write_register(handle, handle->gpio_work_mode);
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}
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avr_err_t zh_avr_pcf8574_read_gpio(zh_avr_pcf8574_handle_t *handle, uint8_t gpio, bool *status)
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{
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ZH_ERROR_CHECK(gpio <= 7, AVR_FAIL);
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uint8_t gpio_temp = _gpio_matrix[gpio];
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uint8_t reg_temp = 0;
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avr_err_t err = _zh_avr_pcf8574_read_register(handle, ®_temp);
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*status = ((reg_temp & gpio_temp) ? 1 : 0);
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return err;
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}
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avr_err_t zh_avr_pcf8574_write_gpio(zh_avr_pcf8574_handle_t *handle, uint8_t gpio, bool status)
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{
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ZH_ERROR_CHECK(gpio <= 7, AVR_FAIL);
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uint8_t gpio_temp = _gpio_matrix[gpio];
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if (status == true)
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{
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return _zh_avr_pcf8574_write_register(handle, handle->gpio_status | handle->gpio_work_mode | gpio_temp);
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}
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return _zh_avr_pcf8574_write_register(handle, (handle->gpio_status ^ gpio_temp) | handle->gpio_work_mode);
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}
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static avr_err_t _zh_avr_pcf8574_validate_config(const zh_avr_pcf8574_init_config_t *config)
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{
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ZH_ERROR_CHECK(config != NULL, AVR_ERR_INVALID_ARG);
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ZH_ERROR_CHECK((config->i2c_address >= 0x20 && config->i2c_address <= 0x27) || (config->i2c_address >= 0x38 && config->i2c_address <= 0x3F), AVR_ERR_INVALID_ARG);
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ZH_ERROR_CHECK(config->task_priority > tskIDLE_PRIORITY && config->stack_size >= 124, AVR_ERR_INVALID_ARG);
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ZH_ERROR_CHECK(config->interrupt_gpio == 0xFF || (config->interrupt_gpio >= PORTD0 && config->interrupt_gpio <= PORTD7), AVR_ERR_INVALID_ARG);
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return AVR_OK;
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}
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static avr_err_t _zh_avr_pcf8574_configure_i2c_device(const zh_avr_pcf8574_init_config_t *config, zh_avr_pcf8574_handle_t *handle)
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{
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avr_err_t err = zh_avr_i2c_master_probe(config->i2c_address, 1000 / portTICK_PERIOD_MS);
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if (err != AVR_OK)
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{
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return err;
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}
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handle->gpio_work_mode = (config->p7_gpio_work_mode << 7) | (config->p6_gpio_work_mode << 6) | (config->p5_gpio_work_mode << 5) |
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(config->p4_gpio_work_mode << 4) | (config->p3_gpio_work_mode << 3) | (config->p2_gpio_work_mode << 2) |
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(config->p1_gpio_work_mode << 1) | (config->p0_gpio_work_mode << 0);
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handle->gpio_status = handle->gpio_work_mode;
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handle->i2c_address = config->i2c_address;
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handle->is_initialized = true;
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return AVR_OK;
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}
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static avr_err_t _zh_avr_pcf8574_configure_interrupts(const zh_avr_pcf8574_init_config_t *config, zh_avr_pcf8574_handle_t handle)
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{
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if (_interrupt_gpio != 0xFF)
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{
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avr_err_t err = zh_avr_vector_push_back(&_vector, &handle);
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ZH_ERROR_CHECK(err == AVR_OK, err)
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return AVR_OK;
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}
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_interrupt_gpio = config->interrupt_gpio;
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avr_err_t err = zh_avr_vector_init(&_vector, sizeof(zh_avr_pcf8574_handle_t));
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ZH_ERROR_CHECK(err == AVR_OK, err);
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err = zh_avr_vector_push_back(&_vector, &handle);
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ZH_ERROR_CHECK(err == AVR_OK, err);
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DDRD &= ~(1 << _interrupt_gpio);
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PORTD |= (1 << _interrupt_gpio);
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PCICR |= (1 << PCIE2);
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PCMSK2 |= (1 << _interrupt_gpio);
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_interrupt_semaphore = xSemaphoreCreateBinary();
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ZH_ERROR_CHECK(_interrupt_semaphore != NULL, AVR_ERR_NO_MEM);
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BaseType_t x_err = xTaskCreate(_zh_avr_pcf8574_isr_processing_task, NULL, config->stack_size, NULL, config->task_priority, NULL);
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if (x_err != pdPASS)
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{
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vSemaphoreDelete(_interrupt_semaphore);
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return AVR_FAIL;
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}
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return AVR_OK;
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}
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BaseType_t zh_avr_pcf8574_isr_handler(void)
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{
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BaseType_t xHigherPriorityTaskWoken = pdFALSE;
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if ((PIND & (1 << _interrupt_gpio)) == 0)
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{
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xSemaphoreGiveFromISR(_interrupt_semaphore, &xHigherPriorityTaskWoken);
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}
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return xHigherPriorityTaskWoken;
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}
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static void _zh_avr_pcf8574_isr_processing_task(void *pvParameter)
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{
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for (;;)
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{
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xSemaphoreTake(_interrupt_semaphore, portMAX_DELAY);
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for (uint8_t i = 0; i < zh_avr_vector_get_size(&_vector); ++i)
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{
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zh_avr_pcf8574_handle_t *handle = zh_avr_vector_get_item(&_vector, i);
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if (handle == NULL)
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{
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continue;
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}
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zh_avr_pcf8574_event_on_isr_t event = {0};
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event.i2c_address = handle->i2c_address;
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event.gpio_number = 0xFF;
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uint8_t old_reg = handle->gpio_status;
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uint8_t new_reg = 0;
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avr_err_t err = _zh_avr_pcf8574_read_register(handle, &new_reg);
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if (err != AVR_OK)
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{
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continue;
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}
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for (uint8_t j = 0; j <= 7; ++j)
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{
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if ((handle->gpio_work_mode & _gpio_matrix[j]) != 0)
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{
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if ((old_reg & _gpio_matrix[j]) != (new_reg & _gpio_matrix[j]))
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{
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event.gpio_number = j;
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event.gpio_level = new_reg & _gpio_matrix[j];
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extern void zh_avr_pcf8574_event_handler(zh_avr_pcf8574_event_on_isr_t * event);
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zh_avr_pcf8574_event_handler(&event);
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}
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}
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}
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}
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}
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vTaskDelete(NULL);
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}
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static avr_err_t _zh_avr_pcf8574_read_register(zh_avr_pcf8574_handle_t *handle, uint8_t *reg)
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{
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ZH_ERROR_CHECK(handle != NULL || reg != NULL, AVR_ERR_INVALID_ARG);
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ZH_ERROR_CHECK(handle->is_initialized == true, AVR_ERR_NOT_FOUND);
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avr_err_t err = zh_avr_i2c_master_receive(handle->i2c_address, &handle->gpio_status, sizeof(handle->gpio_status), 1000 / portTICK_PERIOD_MS);
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ZH_ERROR_CHECK(err == AVR_OK, err);
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*reg = handle->gpio_status;
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return AVR_OK;
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}
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static avr_err_t _zh_avr_pcf8574_write_register(zh_avr_pcf8574_handle_t *handle, uint8_t reg)
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{
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ZH_ERROR_CHECK(handle != NULL, AVR_ERR_INVALID_ARG);
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ZH_ERROR_CHECK(handle->is_initialized == true, AVR_ERR_NOT_FOUND);
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avr_err_t err = zh_avr_i2c_master_transmit(handle->i2c_address, ®, sizeof(reg), 1000 / portTICK_PERIOD_MS);
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ZH_ERROR_CHECK(err == AVR_OK, err);
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handle->gpio_status = reg;
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return AVR_OK;
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} |