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drivers/memory/spiflash: Add MICROPY_HW_SPIFLASH_ENABLE_CACHE option.

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This only needs to be enabled if a board uses FAT FS on external SPI flash.
When disabled (and using external SPI flash) 4k of RAM can be saved.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2020-12-17 16:59:54 +11:00
parent 061cb1a73a
commit e43a74a4db
7 changed files with 27 additions and 0 deletions
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6
ports/stm32/spibdev.c
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@@ -41,19 +41,23 @@ int32_t spi_bdev_ioctl(spi_bdev_t *bdev, uint32_t op, uint32_t arg) {
return 0;
case BDEV_IOCTL_IRQ_HANDLER:
#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
if ((bdev->spiflash.flags & 1) && HAL_GetTick() - bdev->flash_tick_counter_last_write >= 1000) {
mp_spiflash_cache_flush(&bdev->spiflash);
led_state(PYB_LED_RED, 0); // indicate a clean cache with LED off
}
#endif
return 0;
case BDEV_IOCTL_SYNC:
#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
if (bdev->spiflash.flags & 1) {
uint32_t basepri = raise_irq_pri(IRQ_PRI_FLASH); // prevent cache flushing and USB access
mp_spiflash_cache_flush(&bdev->spiflash);
led_state(PYB_LED_RED, 0); // indicate a clean cache with LED off
restore_irq_pri(basepri);
}
#endif
return 0;
case BDEV_IOCTL_BLOCK_ERASE: {
@@ -66,6 +70,7 @@ int32_t spi_bdev_ioctl(spi_bdev_t *bdev, uint32_t op, uint32_t arg) {
return -MP_EINVAL;
}
#if MICROPY_HW_SPIFLASH_ENABLE_CACHE
int spi_bdev_readblocks(spi_bdev_t *bdev, uint8_t *dest, uint32_t block_num, uint32_t num_blocks) {
uint32_t basepri = raise_irq_pri(IRQ_PRI_FLASH); // prevent cache flushing and USB access
mp_spiflash_cached_read(&bdev->spiflash, block_num * FLASH_BLOCK_SIZE, num_blocks * FLASH_BLOCK_SIZE, dest);
@@ -85,6 +90,7 @@ int spi_bdev_writeblocks(spi_bdev_t *bdev, const uint8_t *src, uint32_t block_nu
return ret;
}
#endif // MICROPY_HW_SPIFLASH_ENABLE_CACHE
int spi_bdev_readblocks_raw(spi_bdev_t *bdev, uint8_t *dest, uint32_t block_num, uint32_t block_offset, uint32_t num_bytes) {
uint32_t basepri = raise_irq_pri(IRQ_PRI_FLASH); // prevent cache flushing and USB access