rp2040: fix audio glitch at soft-reload
The internal flash cache wasn't being properly used, because `write_blocks` unconditionally performed the flash write. Fixing this so that the write's not done until `internal_flash_flush` fixes the problem in my test program with i2sout & synthio. as a future optimization, `flash_read_blocks` could learn to read out of the cache, but that's probably not super important.
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@ -95,14 +95,16 @@ void port_internal_flash_flush(void) {
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if (_cache_lba == NO_CACHE) {
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return;
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}
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// Make sure we don't have an interrupt while we do flash operations.
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common_hal_mcu_disable_interrupts();
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flash_range_erase(CIRCUITPY_CIRCUITPY_DRIVE_START_ADDR + _cache_lba, SECTOR_SIZE);
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flash_range_program(CIRCUITPY_CIRCUITPY_DRIVE_START_ADDR + _cache_lba, _cache, SECTOR_SIZE);
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common_hal_mcu_enable_interrupts();
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_cache_lba = NO_CACHE;
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common_hal_mcu_enable_interrupts();
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}
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mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
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port_internal_flash_flush(); // we never read out of the cache, so we have to write it if dirty
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memcpy(dest,
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(void *)(XIP_BASE + CIRCUITPY_CIRCUITPY_DRIVE_START_ADDR + block * FILESYSTEM_BLOCK_SIZE),
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num_blocks * FILESYSTEM_BLOCK_SIZE);
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@ -118,6 +120,7 @@ mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32
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uint8_t block_offset = block_address % blocks_per_sector;
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if (_cache_lba != block_address) {
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port_internal_flash_flush();
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memcpy(_cache,
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(void *)(XIP_BASE + CIRCUITPY_CIRCUITPY_DRIVE_START_ADDR + sector_offset),
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SECTOR_SIZE);
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@ -133,11 +136,6 @@ mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t lba, uint32
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FILESYSTEM_BLOCK_SIZE);
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block++;
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}
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// Make sure we don't have an interrupt while we do flash operations.
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common_hal_mcu_disable_interrupts();
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flash_range_erase(CIRCUITPY_CIRCUITPY_DRIVE_START_ADDR + sector_offset, SECTOR_SIZE);
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flash_range_program(CIRCUITPY_CIRCUITPY_DRIVE_START_ADDR + sector_offset, _cache, SECTOR_SIZE);
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common_hal_mcu_enable_interrupts();
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}
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return 0; // success
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