cc3200/pybspi: Remove static mode=SPI.MASTER parameter for latest HW API.

Per the latest HW API, "SPI" class implements only master side of the
protocol, so mode=SPI.MASTER (which was static for WiPy anyway) is not
required (or allowed). This change is required to correspond to updated
documentation of machine.SPI class which no longer lists "mode".

cc3200/mods/pybspi.c

@@ -148,7 +148,7 @@ STATIC void pybspi_transfer (pyb_spi_obj_t *self, const char *txdata, char *rxda
 STATIC void pyb_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
     pyb_spi_obj_t *self = self_in;
     if (self->baudrate > 0) {
-        mp_printf(print, "SPI(0, SPI.MASTER, baudrate=%u, bits=%u, polarity=%u, phase=%u, firstbit=SPI.MSB)",
+        mp_printf(print, "SPI(0, baudrate=%u, bits=%u, polarity=%u, phase=%u, firstbit=SPI.MSB)",
                   self->baudrate, (self->wlen * 8), self->polarity, self->phase);
     } else {
         mp_print_str(print, "SPI(0)");
@@ -156,13 +156,8 @@ STATIC void pyb_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
 }
 
 STATIC mp_obj_t pyb_spi_init_helper(pyb_spi_obj_t *self, const mp_arg_val_t *args) {
-    // verify that mode is master
-    if (args[0].u_int != SPI_MODE_MASTER) {
-        goto invalid_args;
-    }
-
     uint bits;
-    switch (args[2].u_int) {
+    switch (args[1].u_int) {
     case 8:
         bits = SPI_WL_8;
         break;
@@ -177,27 +172,27 @@ STATIC mp_obj_t pyb_spi_init_helper(pyb_spi_obj_t *self, const mp_arg_val_t *arg
         break;
     }
 
-    uint polarity = args[3].u_int;
-    uint phase = args[4].u_int;
+    uint polarity = args[2].u_int;
+    uint phase = args[3].u_int;
     if (polarity > 1 || phase > 1) {
         goto invalid_args;
     }
 
-    uint firstbit = args[5].u_int;
+    uint firstbit = args[4].u_int;
     if (firstbit != PYBSPI_FIRST_BIT_MSB) {
         goto invalid_args;
     }
 
     // build the configuration
-    self->baudrate = args[1].u_int;
-    self->wlen = args[2].u_int >> 3;
+    self->baudrate = args[0].u_int;
+    self->wlen = args[1].u_int >> 3;
     self->config = bits | SPI_CS_ACTIVELOW | SPI_SW_CTRL_CS | SPI_4PIN_MODE | SPI_TURBO_OFF;
     self->polarity = polarity;
     self->phase = phase;
     self->submode = (polarity << 1) | phase;
 
     // assign the pins
-    mp_obj_t pins_o = args[6].u_obj;
+    mp_obj_t pins_o = args[5].u_obj;
     if (pins_o != mp_const_none) {
         mp_obj_t *pins;
         if (pins_o == MP_OBJ_NULL) {
@@ -223,7 +218,6 @@ invalid_args:
 
 static const mp_arg_t pyb_spi_init_args[] = {
     { MP_QSTR_id,                             MP_ARG_INT,  {.u_int = 0} },
-    { MP_QSTR_mode,                           MP_ARG_INT,  {.u_int = SPI_MODE_MASTER} },
     { MP_QSTR_baudrate,     MP_ARG_KW_ONLY  | MP_ARG_INT,  {.u_int = 1000000} },    // 1MHz
     { MP_QSTR_bits,         MP_ARG_KW_ONLY  | MP_ARG_INT,  {.u_int = 8} },
     { MP_QSTR_polarity,     MP_ARG_KW_ONLY  | MP_ARG_INT,  {.u_int = 0} },