stm32/boards/STM32L476DISC: Provide SPI-flash bdev config.

This board shows how to configure external SPI flash as the main storage
medium.  It uses software SPI.

1 files changed, 22 insertions, 0 deletions

diff --git a/ports/stm32/boards/STM32L476DISC/bdev.c b/ports/stm32/boards/STM32L476DISC/bdev.c
new file mode 100644
index 000000000..50a02498a
--- /dev/null
+++ b/ports/stm32/boards/STM32L476DISC/bdev.c
@@ -0,0 +1,22 @@
+#include "storage.h"
+#include "genhdr/pins.h"
+
+// External SPI flash uses standard SPI interface
+
+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,
+};
+
+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*)&soft_spi_bus,
+    .bus.u_spi.proto = &mp_soft_spi_proto,
+};
+
+spi_bdev_t spi_bdev;