commit c590b3545ac5ad37010d25e84e24ac94a6539205
author Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no> Fri Oct 01 15:47:40 2021 +0200
committer Carles Cufí <carles.cufi@nordicsemi.no> Tue Oct 12 12:26:56 2021 +0200
tree 1d9a103df1a6ae0d009f9d21ef24f8662b6e3e46
parent cc69ca1a9bb0d66a79dd02f5f4c1bf8079d6ca40

drivers: serial: Use microseconds to represent timeout

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>

drivers/serial/uart_stm32.c

diff --git a/drivers/serial/uart_stm32.c b/drivers/serial/uart_stm32.c
index 856c32e..a7b71f2 100644
--- a/drivers/serial/uart_stm32.c
+++ b/drivers/serial/uart_stm32.c
@@ -808,10 +808,10 @@
 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));
 	}
 }