kopia lustrzana https://github.com/micropython/micropython
153 wiersze
4.3 KiB
C
153 wiersze
4.3 KiB
C
#include <stdint.h>
|
|
#include "std.h"
|
|
|
|
#include "misc.h"
|
|
#include "led.h"
|
|
#include "flash.h"
|
|
#include "storage.h"
|
|
|
|
#define BLOCK_SIZE (512)
|
|
#define CACHE_MEM_START_ADDR (0x10000000) // CCM data RAM, 64k
|
|
#define FLASH_PART1_START_BLOCK (0x100)
|
|
#define FLASH_PART1_NUM_BLOCKS (224) // 16k+16k+16k+64k=112k
|
|
#define FLASH_MEM_START_ADDR (0x08004000) // sector 1, 16k
|
|
|
|
static bool is_initialised = false;
|
|
static uint32_t cache_flash_sector_id;
|
|
static uint32_t cache_flash_sector_start;
|
|
static uint32_t cache_flash_sector_size;
|
|
static bool cache_dirty;
|
|
|
|
static void cache_flush() {
|
|
if (cache_dirty) {
|
|
// sync the cache RAM buffer by writing it to the flash page
|
|
flash_write(cache_flash_sector_start, (const uint32_t*)CACHE_MEM_START_ADDR, cache_flash_sector_size / 4);
|
|
cache_dirty = false;
|
|
// indicate a clean cache with LED off
|
|
led_state(PYB_LED_R1, 0);
|
|
}
|
|
}
|
|
|
|
static uint8_t *cache_get_addr_for_write(uint32_t flash_addr) {
|
|
uint32_t flash_sector_start;
|
|
uint32_t flash_sector_size;
|
|
uint32_t flash_sector_id = flash_get_sector_info(flash_addr, &flash_sector_start, &flash_sector_size);
|
|
if (cache_flash_sector_id != flash_sector_id) {
|
|
cache_flush();
|
|
memcpy((void*)CACHE_MEM_START_ADDR, (const void*)flash_sector_start, flash_sector_size);
|
|
cache_flash_sector_id = flash_sector_id;
|
|
cache_flash_sector_start = flash_sector_start;
|
|
cache_flash_sector_size = flash_sector_size;
|
|
}
|
|
cache_dirty = true;
|
|
// indicate a dirty cache with LED on
|
|
led_state(PYB_LED_R1, 1);
|
|
return (uint8_t*)CACHE_MEM_START_ADDR + flash_addr - flash_sector_start;
|
|
}
|
|
|
|
void storage_init() {
|
|
if (!is_initialised) {
|
|
cache_flash_sector_id = 0;
|
|
cache_dirty = false;
|
|
is_initialised = true;
|
|
}
|
|
}
|
|
|
|
uint32_t storage_get_block_size() {
|
|
return BLOCK_SIZE;
|
|
}
|
|
|
|
uint32_t storage_get_block_count() {
|
|
return FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS;
|
|
}
|
|
|
|
void storage_flush() {
|
|
cache_flush();
|
|
}
|
|
|
|
static void build_partition(uint8_t *buf, int boot, int type, uint32_t start_block, uint32_t num_blocks) {
|
|
buf[0] = boot;
|
|
|
|
if (num_blocks == 0) {
|
|
buf[1] = 0;
|
|
buf[2] = 0;
|
|
buf[3] = 0;
|
|
} else {
|
|
buf[1] = 0xff;
|
|
buf[2] = 0xff;
|
|
buf[3] = 0xff;
|
|
}
|
|
|
|
buf[4] = type;
|
|
|
|
if (num_blocks == 0) {
|
|
buf[5] = 0;
|
|
buf[6] = 0;
|
|
buf[7] = 0;
|
|
} else {
|
|
buf[5] = 0xff;
|
|
buf[6] = 0xff;
|
|
buf[7] = 0xff;
|
|
}
|
|
|
|
buf[8] = start_block;
|
|
buf[9] = start_block >> 8;
|
|
buf[10] = start_block >> 16;
|
|
buf[11] = start_block >> 24;
|
|
|
|
buf[12] = num_blocks;
|
|
buf[13] = num_blocks >> 8;
|
|
buf[14] = num_blocks >> 16;
|
|
buf[15] = num_blocks >> 24;
|
|
}
|
|
|
|
bool storage_read_block(uint8_t *dest, uint32_t block) {
|
|
//printf("RD %u\n", block);
|
|
if (block == 0) {
|
|
// fake the MBR so we can decide on our own partition table
|
|
|
|
for (int i = 0; i < 446; i++) {
|
|
dest[i] = 0;
|
|
}
|
|
|
|
build_partition(dest + 446, 0, 0x01 /* FAT12 */, FLASH_PART1_START_BLOCK, FLASH_PART1_NUM_BLOCKS);
|
|
build_partition(dest + 462, 0, 0, 0, 0);
|
|
build_partition(dest + 478, 0, 0, 0, 0);
|
|
build_partition(dest + 494, 0, 0, 0, 0);
|
|
|
|
dest[510] = 0x55;
|
|
dest[511] = 0xaa;
|
|
|
|
return true;
|
|
|
|
} else if (FLASH_PART1_START_BLOCK <= block && block < FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS) {
|
|
// non-MBR block, just copy straight from flash
|
|
uint8_t *src = (uint8_t*)FLASH_MEM_START_ADDR + (block - FLASH_PART1_START_BLOCK) * BLOCK_SIZE;
|
|
memcpy(dest, src, BLOCK_SIZE);
|
|
return true;
|
|
|
|
} else {
|
|
// bad block number
|
|
return false;
|
|
}
|
|
}
|
|
|
|
bool storage_write_block(const uint8_t *src, uint32_t block) {
|
|
//printf("WR %u\n", block);
|
|
if (block == 0) {
|
|
// can't write MBR, but pretend we did
|
|
return true;
|
|
|
|
} else if (FLASH_PART1_START_BLOCK <= block && block < FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS) {
|
|
// non-MBR block, copy to cache
|
|
uint32_t flash_addr = FLASH_MEM_START_ADDR + (block - FLASH_PART1_START_BLOCK) * BLOCK_SIZE;
|
|
uint8_t *dest = cache_get_addr_for_write(flash_addr);
|
|
memcpy(dest, src, BLOCK_SIZE);
|
|
return true;
|
|
|
|
} else {
|
|
// bad block number
|
|
return false;
|
|
}
|
|
}
|