esp8266/uart: Add support for polling uart device.
diff --git a/esp8266/uart.c b/esp8266/uart.c
index 001a9c6..6c1f9e0 100644
--- a/esp8266/uart.c
+++ b/esp8266/uart.c
@@ -200,6 +200,21 @@
}
}
+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);