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samples: uart: Check return value from uart_fifo_fill

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If the UART FIFO is already full at the start of the irq tests (e.g.
because the data from the previous polled mode test is still being
transmitted), then uart_fifo_fill() may not not be able to add the
requested character to the FIFO and so return zero.

Fix this issue by repeating retrying uart_fifo_fill() until success.

Change-Id: I055ca1d4c91d81488b89f2a9b00031b9f2b8b222
Signed-off-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
Jon Medhurst 2016-07-20 13:42:39 +01:00 committed by Inaky Perez-Gonzalez
parent 02dc270d5e
commit 93f49c20e9
1 changed files with 2 additions and 1 deletions
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3
samples/drivers/uart/src/main.c
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@ -91,7 +91,8 @@ static void write_buf_irq(struct device *dev, const char *buf, int len)
for (i = 0; i < len; i++) {
data_transmitted = false;
uart_fifo_fill(dev, &buf[i], 1);
while (uart_fifo_fill(dev, &buf[i], 1) == 0)
;
while (data_transmitted == false)
;
}