feat(uart): update uart driver for esp32s2beta

components/vfs/vfs_uart.c

@@ -32,7 +32,7 @@
 #endif
 
 // TODO: make the number of UARTs chip dependent
-#define UART_NUM 3
+#define UART_NUM SOC_UART_NUM
 
 // Token signifying that no character is available
 #define NONE -1
@@ -51,12 +51,27 @@ static void uart_tx_char_via_driver(int fd, int c);
 static int uart_rx_char_via_driver(int fd);
 
 // Pointers to UART peripherals
-static uart_dev_t* s_uarts[UART_NUM] = {&UART0, &UART1, &UART2};
+static uart_dev_t* s_uarts[UART_NUM] = {
+    &UART0,
+    &UART1,
+#if UART_NUM > 2
+    &UART2
+#endif
+};
+
+// One-character buffer used for newline conversion code, per UART
+static int s_peek_char[UART_NUM] = {
+    NONE,
+    NONE,
+#if UART_NUM > 2
+    NONE
+#endif
+};
+
 // per-UART locks, lazily initialized
 static _lock_t s_uart_read_locks[UART_NUM];
 static _lock_t s_uart_write_locks[UART_NUM];
-// One-character buffer used for newline conversion code, per UART
-static int s_peek_char[UART_NUM] = { NONE, NONE, NONE };
+
 // Per-UART non-blocking flag. Note: default implementation does not honor this
 // flag, all reads are non-blocking. This option becomes effective if UART
 // driver is used.
@@ -98,15 +113,22 @@ static void uart_end_select();
 
 // Functions used to write bytes to UART. Default to "basic" functions.
 static tx_func_t s_uart_tx_func[UART_NUM] = {
-        &uart_tx_char, &uart_tx_char, &uart_tx_char
+        &uart_tx_char,
+        &uart_tx_char,
+#if UART_NUM > 2
+        &uart_tx_char
+#endif
 };
 
 // Functions used to read bytes from UART. Default to "basic" functions.
 static rx_func_t s_uart_rx_func[UART_NUM] = {
-        &uart_rx_char, &uart_rx_char, &uart_rx_char
+        &uart_rx_char,
+        &uart_rx_char,
+#if UART_NUM > 2
+        &uart_rx_char
+#endif
 };
 
-
 static int uart_open(const char * path, int flags, int mode)
 {
     // this is fairly primitive, we should check if file is opened read only,