drivers/memory/spiflash: Change to use low-level SPI object not uPy one.

This patch alters the SPI-flash memory driver so that it uses the new
low-level C SPI protocol (from drivers/bus/spi.h) instead of the uPy SPI
protocol (from extmod/machine_spi.h).  This allows the SPI-flash driver to
be used independently from the uPy runtime.

drivers/memory/spiflash.c

@@ -162,7 +162,7 @@ void mp_spiflash_init(mp_spiflash_t *self) {
     if (self->config->bus_kind == MP_SPIFLASH_BUS_SPI) {
         mp_hal_pin_write(self->config->bus.u_spi.cs, 1);
         mp_hal_pin_output(self->config->bus.u_spi.cs);
-        self->config->bus.u_spi.proto->init(self->config->bus.u_spi.data, 0, NULL, (mp_map_t*)&mp_const_empty_map);
+        self->config->bus.u_spi.proto->ioctl(self->config->bus.u_spi.data, MP_SPI_IOCTL_INIT);
     } else {
         self->config->bus.u_qspi.proto->ioctl(self->config->bus.u_qspi.data, MP_QSPI_IOCTL_INIT);
     }

drivers/memory/spiflash.h

@@ -26,8 +26,8 @@
 #ifndef MICROPY_INCLUDED_DRIVERS_MEMORY_SPIFLASH_H
 #define MICROPY_INCLUDED_DRIVERS_MEMORY_SPIFLASH_H
 
+#include "drivers/bus/spi.h"
 #include "drivers/bus/qspi.h"
-#include "extmod/machine_spi.h"
 
 enum {
     MP_SPIFLASH_BUS_SPI,
@@ -40,7 +40,7 @@ typedef struct _mp_spiflash_config_t {
         struct {
             mp_hal_pin_obj_t cs;
             void *data;
-            const mp_machine_spi_p_t *proto;
+            const mp_spi_proto_t *proto;
         } u_spi;
         struct {
             void *data;

ports/stm32/spibdev.c

@@ -40,23 +40,20 @@ static uint32_t flash_tick_counter_last_write;
 
 // External SPI flash uses standard SPI interface
 
-STATIC const mp_machine_soft_spi_obj_t spiflash_spi_bus = {
-    .base = {&mp_machine_soft_spi_type},
-    .spi = {
+STATIC const mp_soft_spi_obj_t soft_spi_bus = {
     .delay_half = MICROPY_HW_SOFTSPI_MIN_DELAY,
     .polarity = 0,
     .phase = 0,
     .sck = &MICROPY_HW_SPIFLASH_SCK,
     .mosi = &MICROPY_HW_SPIFLASH_MOSI,
     .miso = &MICROPY_HW_SPIFLASH_MISO,
-    }
 };
 
 STATIC const mp_spiflash_config_t spiflash_config = {
     .bus_kind = MP_SPIFLASH_BUS_SPI,
     .bus.u_spi.cs = &MICROPY_HW_SPIFLASH_CS,
-    .bus.u_spi.data = (void*)&spiflash_spi_bus,
-    .bus.u_spi.proto = &mp_machine_soft_spi_p,
+    .bus.u_spi.data = (void*)&soft_spi_bus,
+    .bus.u_spi.proto = &mp_soft_spi_proto,
 };
 
 #elif defined(MICROPY_HW_SPIFLASH_IO0)