Getting current transmit status of the UART driver

[xgaroux]

Hi! I'm trying to figure out if there is a way to get current transmit status of UART driver?

I found a function in the HAL that fully matches my question:

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#define uart_hal_is_tx_idle(hal)  uart_ll_is_tx_idle((hal)->dev)

But it use only in block waiting for the transmission ends and internal ISR routine. May be there are some macros or any other API I missed? Is there a way to use it without breaking library hierarchy and jumping to HAL from my code?

Also I can't understand using of this API - FIFO space threshold or transmission timeout reached:

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uart_intr_config(), uart_enable_tx_intr()

I can configurate this interrupts, but no functions to use this interrupts or callbacks for it. How work with it? In case when I don't register a custom lower level interrupt handler using

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uart_isr_register()

Thanks in advance, Michael.

[fevang]

You might be able to call

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/**
 * @brief Wait until UART TX FIFO is empty.
 *
 * @param uart_num      UART port number, the max port number is (UART_NUM_MAX -1).
 * @param ticks_to_wait Timeout, count in RTOS ticks
 *
 * @return
 *     - ESP_OK   Success
 *     - ESP_FAIL Parameter error
 *     - ESP_ERR_TIMEOUT  Timeout
 */
esp_err_t uart_wait_tx_done(uart_port_t uart_num, TickType_t ticks_to_wait);

with ticks_to_wait = 0, and check the return value.
If it returns ESP_ERR_TIMEOUT, then you know a transmission is happening.

For example

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if(uart_wait_tx_done(UART_NUM_1, 0) == ESP_ERR_TIMEOUT){
	// Transaction is currently taking place
}

[xgaroux]

You might be able to call

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/**
 * @brief Wait until UART TX FIFO is empty.
 *
 * @param uart_num      UART port number, the max port number is (UART_NUM_MAX -1).
 * @param ticks_to_wait Timeout, count in RTOS ticks
 *
 * @return
 *     - ESP_OK   Success
 *     - ESP_FAIL Parameter error
 *     - ESP_ERR_TIMEOUT  Timeout
 */
esp_err_t uart_wait_tx_done(uart_port_t uart_num, TickType_t ticks_to_wait);

with ticks_to_wait = 0, and check the return value.
If it returns ESP_ERR_TIMEOUT, then you know a transmission is happening.

Thank you for your reply! I missed such a simple opportunity to solve my problem with transmit status.

But the second part of my question (FIFO space threshold API) is still not clear...