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UART: fix transmission problem when buffer is full

This commit is contained in:
King Kévin 2018-06-14 13:18:51 +02:00
parent 730885fbdd
commit 3c7466ca0e
1 changed files with 2 additions and 2 deletions
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4
lib/uart.c
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@ -15,7 +15,7 @@
/** library for UART communication (code) /** library for UART communication (code)
* @file uart.c * @file uart.c
* @author King Kévin <kingkevin@cuvoodoo.info> * @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2016-2017 * @date 2016-2018
* @note peripherals used: USART @ref uart * @note peripherals used: USART @ref uart
*/ */
@ -92,7 +92,7 @@ void uart_putchar_nonblocking(char c)
{ {
while (tx_used>=LENGTH(tx_buffer)) { // idle until buffer has some space while (tx_used>=LENGTH(tx_buffer)) { // idle until buffer has some space
usart_enable_tx_interrupt(USART(UART_ID)); // enable transmit interrupt usart_enable_tx_interrupt(USART(UART_ID)); // enable transmit interrupt
__WFI(); // sleep until something happened // don't go to sleep since this might prevent an interrupt
} }
usart_disable_tx_interrupt(USART(UART_ID)); // disable transmit interrupt to prevent index corruption usart_disable_tx_interrupt(USART(UART_ID)); // disable transmit interrupt to prevent index corruption
tx_buffer[(tx_i+tx_used)%LENGTH(tx_buffer)] = c; // put character in buffer tx_buffer[(tx_i+tx_used)%LENGTH(tx_buffer)] = c; // put character in buffer