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Merge branch 'bugfix/uart_wait_idle' into 'master'

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uart: fix uart_tx_wait_idle to wait for fifo empty

See merge request idf/esp-idf!3489
This commit is contained in:
Ivan Grokhotkov
2018-10-18 11:25:59 +08:00
parent 9b566a8965 508fb79a26
commit 18684f53ee
2 changed files with 8 additions and 4 deletions
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8
components/esp32/include/rom/uart.h
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@@ -267,9 +267,11 @@ void uart_tx_flush(uint8_t uart_no);
* here for compatibility.
*/
static inline void IRAM_ATTR uart_tx_wait_idle(uint8_t uart_no) {
while(REG_GET_FIELD(UART_STATUS_REG(uart_no), UART_ST_UTX_OUT)) {
;
}
uint32_t status;
do {
status = READ_PERI_REG(UART_STATUS_REG(uart_no));
/* either tx count or state is non-zero */
} while ((status & (UART_ST_UTX_OUT_M | UART_TXFIFO_CNT_M)) != 0);
}
/**