Fixes UartAvailableForWrite #9319

SuGlider · web-flow · commit 8bb1a24a9a02 · 2024-03-07T18:45:23.000-03:00
diff --git a/cores/esp32/esp32-hal-uart.c b/cores/esp32/esp32-hal-uart.c
@@ -578,7 +578,7 @@ uint32_t uartAvailableForWrite(uart_t* uart)
     uint32_t available =  uart_ll_get_txfifo_len(UART_LL_GET_HW(uart->num));  
     size_t txRingBufferAvailable = 0;
     if (ESP_OK == uart_get_tx_buffer_free_size(uart->num, &txRingBufferAvailable)) {
-        available += txRingBufferAvailable; 
+        available = txRingBufferAvailable == 0 ? available : txRingBufferAvailable; 
     }
     UART_MUTEX_UNLOCK();
     return available;

Original file line number	Diff line number	Diff line change
`@@ -578,7 +578,7 @@ uint32_t uartAvailableForWrite(uart_t* uart)`
`578`	`578`	`uint32_t available = uart_ll_get_txfifo_len(UART_LL_GET_HW(uart->num));`
`579`	`579`	`size_t txRingBufferAvailable = 0;`
`580`	`580`	`if (ESP_OK == uart_get_tx_buffer_free_size(uart->num, &txRingBufferAvailable)) {`
`581`		`- available += txRingBufferAvailable;`
	`581`	`+ available = txRingBufferAvailable == 0 ? available : txRingBufferAvailable;`
`582`	`582`	`}`
`583`	`583`	`UART_MUTEX_UNLOCK();`
`584`	`584`	`return available;`