renesas-ra/machine_uart: Add the UART.IRQ_RX class constant.

The renesas-ra port supports calling a handler to be called on every byte
received by UART.  For consistency with other ports, the symbol IRQ_RX
is added as the trigger name.

Side change: Add the received UART data to the REPL input buffer only if it
is the REPL UART.  Otherwise, every UART would act as REPL input.
Signed-off-by: robert-hh <robert@hammelrath.com>

ports/renesas-ra/machine_uart.c

@@ -41,6 +41,7 @@
 #define MICROPY_PY_MACHINE_UART_CLASS_CONSTANTS \
     { MP_ROM_QSTR(MP_QSTR_RTS), MP_ROM_INT(UART_HWCONTROL_RTS) }, \
     { MP_ROM_QSTR(MP_QSTR_CTS), MP_ROM_INT(UART_HWCONTROL_CTS) }, \
+    { MP_ROM_QSTR(MP_QSTR_IRQ_RX), MP_ROM_INT(0x10) }, \
 
 static const char *_parity_name[] = {"None", "ODD", "EVEN"};
 

ports/renesas-ra/uart.c

@@ -71,14 +71,18 @@ static void uart_rx_cb(uint32_t ch, int d) {
         // even disable the IRQ.  This should never happen.
         return;
     }
-    #if MICROPY_KBD_EXCEPTION
-    if (keyex_cb[ch]) {
-        (*keyex_cb[ch])(d);
-    }
-    #endif
+    #if defined(MICROPY_HW_UART_REPL)
+    if (ch == MICROPY_HW_UART_REPL) {
+        #if MICROPY_KBD_EXCEPTION
+        if (keyex_cb[ch]) {
+            (*keyex_cb[ch])(d);
+        }
+        #endif
 
-    #if MICROPY_HW_ENABLE_UART_REPL
-    ringbuf_put(&stdin_ringbuf, d);
+        #if MICROPY_HW_ENABLE_UART_REPL
+        ringbuf_put(&stdin_ringbuf, d);
+        #endif
+    }
     #endif
 
     // Check the flags to see if the user handler should be called