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esp8266/uart: Add support for polling uart device.

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This commit is contained in:
marc hoffman
2017-01-29 21:48:55 -05:00
committed by Damien George
parent 90ab191b65
commit 91eb0153d3
3 changed files with 34 additions and 2 deletions
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15
esp8266/uart.c
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@@ -200,6 +200,21 @@ bool uart_rx_wait(uint32_t timeout_us) {
}
}
int uart_rx_any(uint8 uart) {
if (input_buf.iget != input_buf.iput) {
return true; // have at least 1 char ready for reading
}
return false;
}
int uart_tx_any_room(uint8 uart) {
uint32_t fifo_cnt = READ_PERI_REG(UART_STATUS(uart)) & (UART_TXFIFO_CNT << UART_TXFIFO_CNT_S);
if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) >= 126) {
return false;
}
return true;
}
// Returns char from the input buffer, else -1 if buffer is empty.
int uart_rx_char(void) {
return ringbuf_get(&input_buf);