From c04d2d691c77ca3a4a623e0af866e58f67914573 Mon Sep 17 00:00:00 2001
From: iabdalkader <i.abdalkader@gmail.com>
Date: Sat, 11 Oct 2025 14:41:13 +0200
Subject: [PATCH] qemu/uart: Implement uart_rx_any function.

So it can be used for polling.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
---
 ports/qemu/uart.c | 20 ++++++++++++++++++++
 ports/qemu/uart.h |  1 +
 2 files changed, 21 insertions(+)

diff --git a/ports/qemu/uart.c b/ports/qemu/uart.c
index fb9376d1fb..6bf4ba6e2e 100644
--- a/ports/qemu/uart.c
+++ b/ports/qemu/uart.c
@@ -57,6 +57,10 @@ int uart_rx_chr(void) {
     return UART0->DR;
 }
 
+int uart_rx_any(void) {
+    return UART0->SR & UART_SR_RXNE;
+}
+
 void uart_tx_strn(const char *buf, size_t len) {
     for (size_t i = 0; i < len; ++i) {
         UART0->DR = buf[i];
@@ -94,6 +98,10 @@ int uart_rx_chr(void) {
     return UART0->RXD;
 }
 
+int uart_rx_any(void) {
+    return UART0->RXDRDY ? 1 : 0;
+}
+
 void uart_tx_strn(const char *buf, size_t len) {
     for (size_t i = 0; i < len; ++i) {
         UART0->TXD = buf[i];
@@ -130,6 +138,10 @@ int uart_rx_chr(void) {
     return UART0->DATA;
 }
 
+int uart_rx_any(void) {
+    return UART0->STATE & UART_STATE_RXFULL;
+}
+
 void uart_tx_strn(const char *buf, size_t len) {
     for (size_t i = 0; i < len; ++i) {
         while (UART0->STATE & UART_STATE_TXFULL) {
@@ -170,6 +182,10 @@ int uart_rx_chr(void) {
     return UART1->URXD & 0xff;
 }
 
+int uart_rx_any(void) {
+    return !(UART1->UTS1 & UART_UTS1_RXEMPTY);
+}
+
 void uart_tx_strn(const char *buf, size_t len) {
     for (size_t i = 0; i < len; ++i) {
         UART1->UTXD = buf[i];
@@ -200,6 +216,10 @@ int uart_rx_chr(void) {
     return UART_RX_NO_CHAR;
 }
 
+int uart_rx_any(void) {
+    return UART0->LSR & UART_LSR_DR;
+}
+
 void uart_tx_strn(const char *buffer, size_t length) {
     for (size_t index = 0; index < length; index++) {
         while (!(UART0->LSR & UART_LSR_THRE)) {
diff --git a/ports/qemu/uart.h b/ports/qemu/uart.h
index 9c62a295d1..5363222f83 100644
--- a/ports/qemu/uart.h
+++ b/ports/qemu/uart.h
@@ -33,6 +33,7 @@
 
 void uart_init(void);
 int uart_rx_chr(void);
+int uart_rx_any(void);
 void uart_tx_strn(const char *buf, size_t len);
 
 #endif // MICROPY_INCLUDED_QEMU_ARM_UART_H