ARMmbed
/
mbed-os
mirror of https://github.com/ARMmbed/mbed-os.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Implemented Erase functionality

pull/7774/head
Deepika 2017-06-27 17:08:31 -05:00
parent d82f084f11
commit b31e9754da
2 changed files with 47 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
features/filesystem/sd/SDBlockDevice.cpp
View File

@ -511,7 +511,40 @@ int SDBlockDevice::read(void *b, bd_addr_t addr, bd_size_t size)
int SDBlockDevice::erase(bd_addr_t addr, bd_size_t size)
{
return 0;
if (!is_valid_erase(addr, size)) {
return SD_BLOCK_DEVICE_ERROR_PARAMETER;
}
_lock.lock();
if (!_is_initialized) {
_lock.unlock();
return SD_BLOCK_DEVICE_ERROR_NO_INIT;
}
int status = BD_ERROR_OK;
uint8_t response = 0xFF;
size -= _block_size;
// SDSC Card (CCS=0) uses byte unit address
// SDHC and SDXC Cards (CCS=1) use block unit address (512 Bytes unit)
if (SDCARD_V2HC == _card_type) {
size = size / _block_size;
addr = addr / _block_size;
}
// Start lba sent in start command
if (BD_ERROR_OK != (status = _cmd(CMD32_ERASE_WR_BLK_START_ADDR, addr))) {
_lock.unlock();
return status;
}
// End lba = addr+size sent in end addr command
if (BD_ERROR_OK != (status = _cmd(CMD33_ERASE_WR_BLK_END_ADDR, addr+size))) {
_lock.unlock();
return status;
}
status = _cmd(CMD38_ERASE, 0x0);
_lock.unlock();
return status;
}
bd_size_t SDBlockDevice::get_read_size() const
@ -526,7 +559,7 @@ bd_size_t SDBlockDevice::get_program_size() const
bd_size_t SDBlockDevice::get_erase_size() const
{
return _block_size;
return _erase_size;
}
bd_size_t SDBlockDevice::size() const
@ -827,6 +860,14 @@ uint32_t SDBlockDevice::_sd_sectors() {
debug_if(SD_DBG, "Standard Capacity: c_size: %d \n", c_size);
debug_if(SD_DBG, "Sectors: 0x%x : %ld\n", blocks, blocks);
debug_if(SD_DBG, "Capacity: 0x%x : %lld MB\n", capacity, (capacity/(1024U*1024U)));
// ERASE_BLK_EN = 1: Erase in multiple of 512 bytes supported
if (ext_bits(csd, 46, 46)) {
_erase_size = BLOCK_SIZE_HC;
} else {
// ERASE_BLK_EN = 1: Erase in multiple of SECTOR_SIZE supported
_erase_size = ext_bits(csd, 45, 39);
}
break;
case 1:
@ -836,6 +877,8 @@ uint32_t SDBlockDevice::_sd_sectors() {
debug_if(SD_DBG, "SDHC/SDXC Card: hc_c_size: %d \n", hc_c_size);
debug_if(SD_DBG, "Sectors: 0x%x : %ld\n", blocks, blocks);
debug_if(SD_DBG, "Capacity: 0x%x : %ld MB\n", capacity, (capacity/(1024U*1024U)));
// ERASE_BLK_EN is fixed to 1, which means host can erase one or multiple of 512 bytes.
_erase_size = BLOCK_SIZE_HC;
break;
default:

3
features/filesystem/sd/SDBlockDevice.h
View File

@ -210,7 +210,8 @@ private:
void _deselect();
mutable Mutex _lock;
unsigned _block_size;
uint32_t _block_size;
uint32_t _erase_size;
bool _is_initialized;
bool _dbg;
};