1 files changed, 78 insertions, 0 deletions
diff --git a/ports/stm32/spibdev.c b/ports/stm32/spibdev.c
new file mode 100644
index 0000000000..5e5123867d
--- /dev/null
+++ b/ports/stm32/spibdev.c
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017-2018 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "py/obj.h"
+#include "storage.h"
+
+#if defined(MICROPY_HW_SPIFLASH_SIZE_BITS)
+
+#include "drivers/memory/spiflash.h"
+#include "genhdr/pins.h"
+
+STATIC const mp_machine_soft_spi_obj_t spiflash_spi_bus = {
+    .base = {&mp_machine_soft_spi_type},
+    .delay_half = MICROPY_PY_MACHINE_SPI_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_t spiflash = {
+    .cs = &MICROPY_HW_SPIFLASH_CS,
+    .spi = (mp_obj_base_t*)&spiflash_spi_bus.base,
+};
+
+void spi_bdev_init(void) {
+    mp_spiflash_init((mp_spiflash_t*)&spiflash);
+}
+
+bool spi_bdev_readblock(uint8_t *dest, uint32_t block) {
+    // we must disable USB irqs to prevent MSC contention with SPI flash
+    uint32_t basepri = raise_irq_pri(IRQ_PRI_OTG_FS);
+
+    mp_spiflash_read((mp_spiflash_t*)&spiflash,
+        block * FLASH_BLOCK_SIZE, FLASH_BLOCK_SIZE, dest);
+
+    restore_irq_pri(basepri);
+
+    return true;
+}
+
+bool spi_bdev_writeblock(const uint8_t *src, uint32_t block) {
+    // we must disable USB irqs to prevent MSC contention with SPI flash
+    uint32_t basepri = raise_irq_pri(IRQ_PRI_OTG_FS);
+
+    int ret = mp_spiflash_write((mp_spiflash_t*)&spiflash,
+        block * FLASH_BLOCK_SIZE, FLASH_BLOCK_SIZE, src);
+
+    restore_irq_pri(basepri);
+
+    return ret == 0;
+}
+
+#endif // defined(MICROPY_HW_SPIFLASH_SIZE_BITS)