drivers/bus: Pull out software SPI implementation to dedicated driver.

This patch takes the software SPI implementation from extmod/machine_spi.c
and moves it to a dedicated file in drivers/bus/softspi.c.  This allows the
SPI driver to be used independently of the uPy runtime, making it a more
general component.

1 files changed, 2 insertions, 8 deletions

diff --git a/extmod/machine_spi.h b/extmod/machine_spi.h
index 3ee1b241f..db21e1cd3 100644
--- a/extmod/machine_spi.h
+++ b/extmod/machine_spi.h
@@ -28,6 +28,7 @@
 
 #include "py/obj.h"
 #include "py/mphal.h"
+#include "drivers/bus/spi.h"
 
 // SPI protocol
 typedef struct _mp_machine_spi_p_t {
@@ -38,20 +39,13 @@ typedef struct _mp_machine_spi_p_t {
 
 typedef struct _mp_machine_soft_spi_obj_t {
     mp_obj_base_t base;
-    uint32_t delay_half; // microsecond delay for half SCK period
-    uint8_t polarity;
-    uint8_t phase;
-    mp_hal_pin_obj_t sck;
-    mp_hal_pin_obj_t mosi;
-    mp_hal_pin_obj_t miso;
+    mp_soft_spi_obj_t spi;
 } mp_machine_soft_spi_obj_t;
 
 extern const mp_machine_spi_p_t mp_machine_soft_spi_p;
 extern const mp_obj_type_t mp_machine_soft_spi_type;
 extern const mp_obj_dict_t mp_machine_spi_locals_dict;
 
-void mp_machine_soft_spi_transfer(mp_obj_base_t *self, size_t len, const uint8_t *src, uint8_t *dest);
-
 mp_obj_t mp_machine_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args);
 
 MP_DECLARE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_read_obj);