zephyr: Correct usage of the UART flow control parameter.

Signed-off-by: Daniel Campora <[email protected]>

Author: danicampora

ports/zephyr/machine_uart.c

@@ -91,7 +91,7 @@ static void mp_machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args,
         { MP_QSTR_rxbuf, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = UART_TX_RING_BUF_DEF_SIZE} },
         { MP_QSTR_timeout, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
         { MP_QSTR_timeout_char, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
-        { MP_QSTR_flow, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
+        { MP_QSTR_flow, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
     };
 
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
@@ -136,9 +136,9 @@ static void mp_machine_uart_init_helper(machine_uart_obj_t *self, size_t n_args,
     }
 
     uint8_t flow_ctrl;
-    if (args[ARG_flow].u_obj == mp_const_none) {
+    if (args[ARG_flow].u_int == 0) {
         flow_ctrl = UART_CFG_FLOW_CTRL_NONE;
-    } else if (mp_obj_get_int(args[ARG_flow].u_obj) == (MACHINE_UART_RTS | MACHINE_UART_RTS)) {
+    } else if (args[ARG_flow].u_int == (MACHINE_UART_RTS | MACHINE_UART_CTS)) {
         flow_ctrl = UART_CFG_FLOW_CTRL_RTS_CTS;
     } else {
         mp_raise_msg(&mp_type_OSError, MP_ERROR_TEXT("invalid flow control"));