nrf/spi: Allow for external use of new and transfer function.

This patch also opens up for all arguments to be set as positional
arguments such that an external user of the make_new function can set
provide all parameters as positional arguments.

ports/nrf/modules/machine/spi.c

@@ -4,7 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2013, 2014 Damien P. George
- * Copyright (c) 2016 Glenn Ruben Bakke
+ * Copyright (c) 2016 - 2018 Glenn Ruben Bakke
  * Copyright (c) 2018 Ayke van Laethem
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -152,7 +152,7 @@ STATIC int spi_find(mp_obj_t id) {
     }
 }
 
-STATIC void spi_transfer(const machine_hard_spi_obj_t * self, size_t len, const void * src, void * dest) {
+void spi_transfer(const machine_hard_spi_obj_t * self, size_t len, const void * src, void * dest) {
     nrfx_spi_xfer_desc_t xfer_desc = {
         .p_tx_buffer = src,
 	.tx_length   = len,
@@ -198,13 +198,13 @@ STATIC mp_obj_t machine_spi_make_new(const mp_obj_type_t *type, size_t n_args, s
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_id,       MP_ARG_OBJ, {.u_obj = MP_OBJ_NEW_SMALL_INT(-1)} },
         { MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 1000000} },
-        { MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
-        { MP_QSTR_phase,    MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
-        { MP_QSTR_bits,     MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
-        { MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0 /* SPI_FIRSTBIT_MSB */} },
-        { MP_QSTR_sck,      MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
-        { MP_QSTR_mosi,     MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
-        { MP_QSTR_miso,     MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_polarity, MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_phase,    MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_bits,     MP_ARG_INT, {.u_int = 8} },
+        { MP_QSTR_firstbit, MP_ARG_INT, {.u_int = 0 /* SPI_FIRSTBIT_MSB */} },
+        { MP_QSTR_sck,      MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_mosi,     MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_miso,     MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
     };
 
     // parse args

ports/nrf/modules/machine/spi.h

@@ -4,7 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2013, 2014 Damien P. George
- * Copyright (c) 2016 Glenn Ruben Bakke
+ * Copyright (c) 2016 - 2018 Glenn Ruben Bakke
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -26,6 +26,11 @@
  */
 #include "py/obj.h"
 
+typedef struct _machine_hard_spi_obj_t machine_hard_spi_obj_t;
 extern const mp_obj_type_t machine_hard_spi_type;
 
 void spi_init0(void);
+void spi_transfer(const machine_hard_spi_obj_t * self,
+                  size_t                         len,
+                  const void *                   src,
+                  void *                         dest);