cc3200: Make UART choose default id when not given.

cc3200/mods/pybpin.c

@@ -174,6 +174,16 @@ void pin_assign_pins_af (mp_obj_t *pins, uint32_t n_pins, uint32_t pull, uint32_
     }
 }
 
+uint8_t pin_find_peripheral_unit (const mp_obj_t pin, uint8_t fn, uint8_t type) {
+    pin_obj_t *pin_o = pin_find(pin);
+    for (int i = 0; i < pin_o->num_afs; i++) {
+        if (pin_o->af_list[i].fn == fn && pin_o->af_list[i].type == type) {
+            return pin_o->af_list[i].unit;
+        }
+    }
+    nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
+}
+
 /******************************************************************************
 DEFINE PRIVATE FUNCTIONS
  ******************************************************************************/

cc3200/mods/pybpin.h

@@ -135,5 +135,6 @@ void pin_init0(void);
 void pin_config(pin_obj_t *self, int af, uint mode, uint type, int value, uint strength);
 pin_obj_t *pin_find(mp_obj_t user_obj);
 void pin_assign_pins_af (mp_obj_t *pins, uint32_t n_pins, uint32_t pull, uint32_t fn, uint32_t unit);
+uint8_t pin_find_peripheral_unit (const mp_obj_t pin, uint8_t fn, uint8_t type);
 
 #endif  // PYBPIN_H_

cc3200/mods/pybuart.c

@@ -352,18 +352,7 @@ STATIC void pyb_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_k
     }
 }
 
-STATIC const mp_arg_t pyb_uart_init_args[] = {
-    { MP_QSTR_baudrate,     MP_ARG_REQUIRED | MP_ARG_INT,  },
-    { MP_QSTR_bits,         MP_ARG_KW_ONLY  | MP_ARG_INT,  {.u_int = 8} },
-    { MP_QSTR_parity,       MP_ARG_KW_ONLY  | MP_ARG_OBJ,  {.u_obj = mp_const_none} },
-    { MP_QSTR_stop,         MP_ARG_KW_ONLY  | MP_ARG_INT,  {.u_int = 1} },
-    { MP_QSTR_pins,         MP_ARG_KW_ONLY  | MP_ARG_OBJ,  {.u_obj = MP_OBJ_NULL} },
-};
-STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
-    // parse args
-    mp_arg_val_t args[MP_ARRAY_SIZE(pyb_uart_init_args)];
-    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(pyb_uart_init_args), pyb_uart_init_args, args);
-
+STATIC mp_obj_t pyb_uart_init_helper(pyb_uart_obj_t *self, mp_arg_val_t *args) {
     // get the baudrate
     if (args[0].u_int <= 0) {
         goto error;
@@ -445,12 +434,41 @@ error:
     nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, mpexception_value_invalid_arguments));
 }
 
-STATIC mp_obj_t pyb_uart_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {
-    // check arguments
-    mp_arg_check_num(n_args, n_kw, 1, MP_ARRAY_SIZE(pyb_uart_init_args), true);
+STATIC const mp_arg_t pyb_uart_init_args[] = {
+    { MP_QSTR_id,                             MP_ARG_OBJ,  {.u_obj = mp_const_none} },
+    { MP_QSTR_baudrate,                       MP_ARG_INT,  {.u_int = 9600} },
+    { MP_QSTR_bits,                           MP_ARG_INT,  {.u_int = 8} },
+    { MP_QSTR_parity,                         MP_ARG_OBJ,  {.u_obj = mp_const_none} },
+    { MP_QSTR_stop,                           MP_ARG_INT,  {.u_int = 1} },
+    { MP_QSTR_pins,         MP_ARG_KW_ONLY  | MP_ARG_OBJ,  {.u_obj = MP_OBJ_NULL} },
+};
+STATIC mp_obj_t pyb_uart_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *all_args) {
+    // parse args
+    mp_map_t kw_args;
+    mp_map_init_fixed_table(&kw_args, n_kw, all_args + n_args);
+    mp_arg_val_t args[MP_ARRAY_SIZE(pyb_uart_init_args)];
+    mp_arg_parse_all(n_args, all_args, &kw_args, MP_ARRAY_SIZE(args), pyb_uart_init_args, args);
 
     // work out the uart id
-    int32_t uart_id = mp_obj_get_int(args[0]);
+    uint8_t uart_id;
+    if (args[0].u_obj == mp_const_none) {
+        if (args[5].u_obj != MP_OBJ_NULL) {
+            mp_obj_t *pins;
+            mp_uint_t n_pins = 2;
+            mp_obj_get_array(args[5].u_obj, &n_pins, &pins);
+            // check the Tx pin (or the Rx if Tx is None)
+            if (pins[0] == mp_const_none) {
+                uart_id = pin_find_peripheral_unit(pins[1], PIN_FN_UART, PIN_TYPE_UART_RX);
+            } else {
+                uart_id = pin_find_peripheral_unit(pins[0], PIN_FN_UART, PIN_TYPE_UART_TX);
+            }
+        } else {
+            // default id
+            uart_id = 0;
+        }
+    } else {
+        uart_id = mp_obj_get_int(args[0].u_obj);
+    }
 
     if (uart_id < PYB_UART_0 || uart_id > PYB_UART_1) {
         nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, mpexception_os_resource_not_avaliable));
@@ -461,18 +479,17 @@ STATIC mp_obj_t pyb_uart_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t
     self->base.type = &pyb_uart_type;
     self->uart_id = uart_id;
 
-    if (n_args > 1 || n_kw > 0) {
-        // start the peripheral
-        mp_map_t kw_args;
-        mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
-        pyb_uart_init_helper(self, n_args - 1, args + 1, &kw_args);
-    }
+    // start the peripheral
+    pyb_uart_init_helper(self, &args[1]);
 
     return self;
 }
 
-STATIC mp_obj_t pyb_uart_init(mp_uint_t n_args, const mp_obj_t *args, mp_map_t *kw_args) {
-    return pyb_uart_init_helper(args[0], n_args - 1, args + 1, kw_args);
+STATIC mp_obj_t pyb_uart_init(mp_uint_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    // parse args
+    mp_arg_val_t args[MP_ARRAY_SIZE(pyb_uart_init_args) - 1];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(args), &pyb_uart_init_args[1], args);
+    return pyb_uart_init_helper(pos_args[0], args);
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_KW(pyb_uart_init_obj, 1, pyb_uart_init);
 

cc3200/qstrdefsport.h

@@ -143,6 +143,7 @@ Q(init)
 Q(deinit)
 Q(any)
 Q(sendbreak)
+Q(id)
 Q(baudrate)
 Q(bits)
 Q(stop)

tests/wipy/uart.py

@@ -24,11 +24,23 @@ pyb.repl_uart(None)
 for uart_id in uart_id_range:
     uart = UART(uart_id, 38400)
     print(uart)
-    uart.init(baudrate=57600, stop=1, parity=None, pins=uart_pins[uart_id][0])
+    uart.init(57600, 8, None, 1, pins=uart_pins[uart_id][0])
     uart.init(baudrate=9600, stop=2, parity=0, pins=uart_pins[uart_id][1])
-    uart.init(baudrate=115200, parity=1, pins=uart_pins[uart_id][0])
+    uart.init(baudrate=115200, parity=1, stop=1, pins=uart_pins[uart_id][0])
+    uart = UART(baudrate=1000000)
     uart.sendbreak()
 
+uart = UART()
+print(uart)
+uart = UART(baudrate=38400, pins=('GP12', 'GP13'))
+print(uart)
+uart = UART(pins=('GP12', 'GP13'))
+print(uart)
+uart = UART(pins=(None, 'GP17'))
+print(uart)
+uart = UART(baudrate=57600, pins=('GP16', 'GP17'))
+print(uart)
+
 # now it's time for some loopback tests between the uarts
 uart0 = UART(0, 1000000, pins=uart_pins[0][0])
 print(uart0)
@@ -50,6 +62,8 @@ print(buf)
 print(uart1.readinto(buf) == 2)
 print(buf)
 
+# try initializing without the id
+uart0 = UART(baudrate=1000000, pins=uart_pins[0][0])
 uart0.write(b'1234567890')
 pyb.delay(2) # because of the fifo interrupt levels
 print(uart1.any() == 10)
@@ -127,6 +141,11 @@ try:
 except Exception:
     print('Exception')
 
+try:
+    UART(2, 9600)
+except Exception:
+    print('Exception')    
+
 for uart_id in uart_id_range:
     uart = UART(uart_id, 1000000)
     uart.deinit()

tests/wipy/uart.py.exp

 UART(0, baudrate=38400, bits=8, parity=None, stop=1)
 UART(1, baudrate=38400, bits=8, parity=None, stop=1)
+UART(0, baudrate=9600, bits=8, parity=None, stop=1)
+UART(0, baudrate=38400, bits=8, parity=None, stop=1)
+UART(0, baudrate=9600, bits=8, parity=None, stop=1)
+UART(1, baudrate=9600, bits=8, parity=None, stop=1)
+UART(1, baudrate=57600, bits=8, parity=None, stop=1)
 UART(0, baudrate=1000000, bits=8, parity=None, stop=1)
 UART(1, baudrate=1000000, bits=8, parity=None, stop=1)
 True
@@ -40,6 +45,7 @@ Exception
 Exception
 Exception
 Exception
+Exception
 UART(0)
 UART(0, baudrate=115200, bits=8, parity=None, stop=1)
 UART(1)