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cpu/stm32_common/uart: Prevent uart from sending if not initialized

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Due to the stdio getting called after periph_init the uart may send before initialized.
This adds a simple check so the uart does not get into a locked-up state.
This commit is contained in:
MrKevinWeiss 2018-12-14 11:08:51 +01:00
parent 5c4b398c20
commit 96f8438ea2
1 changed files with 6 additions and 1 deletions
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7
cpu/stm32_common/periph/uart.c
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@ -145,7 +145,12 @@ static inline void wait_for_tx_complete(uart_t uart)
void uart_write(uart_t uart, const uint8_t *data, size_t len)
{
assert(uart < UART_NUMOF);
#if DEVELHELP
/* If tx is not enabled don't try to send */
if (!(dev(uart)->CR1 & USART_CR1_TE)) {
return;
}
#endif
#ifdef MODULE_PERIPH_DMA
if (!len) {
return;