uart: fix uart_tx_wait_idle to wait for fifo empty
See merge request idf/esp-idf!3489
* 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);
}
/**
{
for (int i = 0; i < 3; ++i) {
REG_SET_BIT(UART_FLOW_CONF_REG(i), UART_FORCE_XOFF);
- uart_tx_wait_idle(i);
+ while (REG_GET_FIELD(UART_STATUS_REG(i), UART_ST_UTX_OUT) != 0) {
+ ;
+ }
}
}