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circuitpython/ports/stm32/spibdev.c

133 lines
4.3 KiB

/*
* 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 "systick.h"
#include "led.h"
#include "storage.h"
#if defined(MICROPY_HW_SPIFLASH_SIZE_BITS)
#include "drivers/memory/spiflash.h"
#include "genhdr/pins.h"
static uint32_t flash_tick_counter_last_write;
#if defined(MICROPY_HW_SPIFLASH_MOSI)
// 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 = {
.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,
};
#elif defined(MICROPY_HW_SPIFLASH_IO0)
// External SPI flash uses quad SPI interface
#include "drivers/bus/qspi.h"
STATIC const mp_soft_qspi_obj_t soft_qspi_bus = {
.cs = &MICROPY_HW_SPIFLASH_CS,
.clk = &MICROPY_HW_SPIFLASH_SCK,
.io0 = &MICROPY_HW_SPIFLASH_IO0,
.io1 = &MICROPY_HW_SPIFLASH_IO1,
.io2 = &MICROPY_HW_SPIFLASH_IO2,
.io3 = &MICROPY_HW_SPIFLASH_IO3,
};
STATIC const mp_spiflash_config_t spiflash_config = {
.bus_kind = MP_SPIFLASH_BUS_QSPI,
.bus.u_qspi.data = (void*)&soft_qspi_bus,
.bus.u_qspi.proto = &mp_soft_qspi_proto,
};
#endif
STATIC mp_spiflash_t spiflash;
void spi_bdev_init(void) {
spiflash.config = &spiflash_config;
mp_spiflash_init(&spiflash);
flash_tick_counter_last_write = 0;
}
void spi_bdev_irq_handler(void) {
if ((spiflash.flags & 1) && sys_tick_has_passed(flash_tick_counter_last_write, 1000)) {
mp_spiflash_flush(&spiflash);
led_state(PYB_LED_RED, 0); // indicate a clean cache with LED off
}
}
void spi_bdev_flush(void) {
if (spiflash.flags & 1) {
// we must disable USB irqs to prevent MSC contention with SPI flash
uint32_t basepri = raise_irq_pri(IRQ_PRI_OTG_FS);
mp_spiflash_flush(&spiflash);
led_state(PYB_LED_RED, 0); // indicate a clean cache with LED off
restore_irq_pri(basepri);
}
}
int spi_bdev_readblocks(uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
// 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(&spiflash, block_num * FLASH_BLOCK_SIZE, num_blocks * FLASH_BLOCK_SIZE, dest);
restore_irq_pri(basepri);
return 0;
}
int spi_bdev_writeblocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
// 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(&spiflash, block_num * FLASH_BLOCK_SIZE, num_blocks * FLASH_BLOCK_SIZE, src);
if (spiflash.flags & 1) {
led_state(PYB_LED_RED, 1); // indicate a dirty cache with LED on
flash_tick_counter_last_write = HAL_GetTick();
}
restore_irq_pri(basepri);
return ret;
}
#endif // defined(MICROPY_HW_SPIFLASH_SIZE_BITS)