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add fat layout

This commit is contained in:
hathach 2018-06-20 14:26:08 +07:00
parent 56cf2b087f
commit 6d11aa018a
1 changed files with 25 additions and 5 deletions
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30
src/usb/msc_flash.c
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@ -442,15 +442,35 @@ fat12_boot_sector_t const _boot_sect =
.fs_type = "FAT12 "
};
/* 0 ______________
* | Boot Sector | Fat copies = 1, Fat size = 7
* |_____________| Root Dir = 16*8 (4KB), sector per cluster = 1
* 1 | FAT0 |
* . | |
* . | ( 7x512 ) |
* 7 |_____________|
* 8 | Root Dir |
* . | |
* . | ( 8x512 ) |
* 15|_____________|
* 16| |
* . | |
* . | |
* . | Data |
* . | |
* . | |
* |_____________|
*/
static inline bool fat12_formatted(void)
{
const uint8_t* boot_sect = (uint8_t* ) lba2addr(0);
return (boot_sect[510] == 0x55) && (boot_sect[511] == 0xAA);
}
static void fat12_write_cluster(uint16_t cluster_num, uint8_t const* buf, uint32_t bufsize)
static void fat12_write_sector(uint32_t lba, uint8_t const* buf, uint32_t bufsize)
{
uint32_t addr = lba2addr(cluster_num*8);
uint32_t addr = lba2addr(lba);
nrf_nvmc_page_erase( addr );
nrf_nvmc_write_words(addr, (uint32_t const*) buf, bufsize/4);
@ -470,7 +490,7 @@ static void fat12_mkfs(void)
memcpy(_page_cached+MSC_FLASH_BLOCK_SIZE, "\xF8\xFF\xFF\xFF\x0F\x00", 6);
// Erase and Write first cluster.
fat12_write_cluster(0, _page_cached, FL_PAGE_SIZE);
fat12_write_sector(0, _page_cached, FL_PAGE_SIZE);
//------------- Root Directory cluster -------------//
uint8_t const readme_contents[] = "Adafruit Feather nRF52840";
@ -508,14 +528,14 @@ static void fat12_mkfs(void)
};
// Erase and Write cluster.
fat12_write_cluster(1, _page_cached, FL_PAGE_SIZE);
fat12_write_sector(8, _page_cached, FL_PAGE_SIZE);
//------------- Readme Content cluster -------------//
memclr_(_page_cached, sizeof(_page_cached));
memcpy(_page_cached, readme_contents, sizeof(readme_contents)-1);
// Erase and Write cluster.
fat12_write_cluster(2, _page_cached, FL_PAGE_SIZE);
fat12_write_sector(16, _page_cached, FL_PAGE_SIZE);
}
#endif