light sleep: add uart new final state machine support for esp32s3

components/hal/esp32s3/include/hal/uart_ll.h

@@ -33,6 +33,9 @@ extern "C" {
 #define UART_LL_MIN_WAKEUP_THRESH (2)
 #define UART_LL_INTR_MASK         (0x7ffff) //All interrupt mask
 
+#define UART_LL_FSM_IDLE          (0x0)
+#define UART_LL_FSM_TX_WAIT_SEND  (0xf)
+
 // Define UART interrupts
 typedef enum {
     UART_INTR_RXFIFO_FULL      = (0x1 << 0),

components/soc/esp32s3/include/soc/uart_caps.h

@@ -23,6 +23,9 @@ extern "C" {
 
 #define SOC_UART_NUM           (3)
 
+// UART has an extra TX_WAIT_SEND state when the FIFO is not empty and XOFF is enabled
+#define SOC_UART_SUPPORT_FSM_TX_WAIT_SEND   (1)
+
 #ifdef __cplusplus
 }
 #endif