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drivers: serial: Use microseconds to represent timeout

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Updated uart_rx_enable() and uart_tx() to use timeout given
in microseconds. Previously argument was given in milliseconds.
However, there are cases when milliseconds granularity is not
enough and can significantly reduce a throughput, e.g. 1ms is
100 bytes at 1Mb.

Updated 4 drivers which implement asynchronous API. Updated
places where API was used.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
This commit is contained in:
Krzysztof Chruscinski 2021-10-01 15:47:40 +02:00 • committed by Carles Cufí
commit c590b3545a
8 changed files with 64 additions and 58 deletions
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6
drivers/serial/uart_stm32.c
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@ -808,10 +808,10 @@ static inline void async_evt_rx_buf_release(struct uart_stm32_data *data)
static inline void async_timer_start(struct k_work_delayable *work,
int32_t timeout)
{
if ((timeout != SYS_FOREVER_MS) && (timeout != 0)) {
if ((timeout != SYS_FOREVER_US) && (timeout != 0)) {
/* start timer */
LOG_DBG("async timer started for %d ms", timeout);
k_work_reschedule(work, K_MSEC(timeout));
LOG_DBG("async timer started for %d us", timeout);
k_work_reschedule(work, K_USEC(timeout));
}
}