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fix(esp8266): fix UART output error when start up

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Add UART system API to flush UART and wait until all characters are sent.
This commit is contained in:
dongheng
2019-09-16 13:59:38 +08:00
parent 0769fb46dc
commit 96e5df4ebd
6 changed files with 54 additions and 49 deletions
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17
components/esp8266/include/rom/uart.h
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@ -47,22 +47,7 @@ extern "C" {
* The function defined in ROM code has a bug, so we define the correct version
* here for compatibility.
*/
static inline void IRAM_ATTR uart_tx_wait_idle(uint8_t uart_no) {
uint32_t tx_bytes;
uint32_t baudrate, byte_delay_us;
uart_dev_t *const UART[2] = {&uart0, &uart1};
uart_dev_t *const uart = UART[uart_no];
baudrate = (UART_CLK_FREQ / (uart->clk_div.val & 0xFFFFF));
byte_delay_us = (uint32_t)(10000000 / baudrate);
do {
tx_bytes = uart->status.txfifo_cnt;
/* either tx count or state is non-zero */
} while (tx_bytes);
ets_delay_us(byte_delay_us);
}
void uart_tx_wait_idle(uint8_t uart_no);
/**
* @brief Output a char to printf channel, wait until fifo not full.