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flash_internal: add function to probe actual flash size

This commit is contained in:
King Kévin 2020-03-08 18:17:37 +01:00
parent 2b3b4431e2
commit 1ac92ec4ac
2 changed files with 95 additions and 2 deletions
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90
lib/flash_internal.c
View File

@ -12,7 +12,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** library to read/write internal flash (code)
/** library to read/write internal flash
* @file
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2016-2020
@ -319,3 +319,91 @@ int32_t flash_internal_eeprom_write(const uint8_t *eeprom, uint16_t size)
}
return rc;
}
uint16_t flash_internal_probe_size(void)
{
if (0 == DESIG_FLASH_SIZE) { // no flash size advertised
return 0;
}
// get max flash size based on device identifier (DEV_ID)
uint32_t flash_size_max = 0; // max flash size (in bytes)
switch (DBGMCU_IDCODE & DBGMCU_IDCODE_DEV_ID_MASK) { // get page size based on family code
case 0x412: // low-density, 16-32 kB flash
flash_size_max = 32;
break;
case 0x410: // medium-density, 64-128 kB flash
flash_size_max = 128;
break;
case 0x414: // high-density, 256-512 kB flash
flash_size_max = 512;
break;
case 0x430: // XL-density, 768-1024 kB flash
flash_size_max = 1024;
break;
case 0x418: // connectivity, 64-256 kB flash
flash_size_max = 256;
break;
case 0: // DBGMCU_IDCODE is only accessible in debug mode (this is a known issue documented in STM32F10xxC/D/E Errata sheet, without workaround)
default: // unknown
if ((*(uint32_t*)0x1FFFF000 & 0xFFFE0000) == 0x20000000) { // non-connectivity system memory start detected (MSP address pointing to SRAM
switch (DESIG_FLASH_SIZE) {
case 16:
case 32:
flash_size_max = 32; // low-density, 16-32 kB flash
break;
case 64:
case 128:
flash_size_max = 128; // medium-density, 64-128 kB flash
break;
case 256:
case 512:
flash_size_max = 512; // high-density, 256-512 kB flash
break;
case 768:
case 1024:
flash_size_max = 1024; // XL-density, 768-1024 kB flash
break;
default:
break;
}
} else { // connectivity system memory start is at 0x1FFFB000
flash_size_max = 256; // connectivity, 64-256 kB flash
}
break;
}
if (0 == flash_size_max) { // could not determine max flash size
return 0;
}
flash_size_max *= 1024; // get in bytes
// test if page is writable, starting with last one
uint32_t flash_size; // tested flash size (in bytes)
const uint16_t test_data = 0x2342; // the data we will write and read to test page
flash_unlock(); // unlock flash to be able to write it
for (flash_size = DESIG_FLASH_SIZE * 1024 - flash_internal_page_size(); flash_size < flash_size_max; flash_size += flash_internal_page_size()) { // don't exceed max size else it will erase the first page (weird behaviour)
uint32_t address = FLASH_BASE + flash_size;
flash_erase_page(address); // erase current page
if (flash_get_status_flags() != FLASH_SR_EOP) { // operation went wrong
break;
}
flash_program_half_word(address, test_data); // writes test data
if (flash_get_status_flags() != FLASH_SR_EOP) { // operation went wrong
break;
}
if (test_data != *((uint16_t*)address)) { // verify data is written correctly
break;
}
flash_erase_page(address); // erase test data
if (flash_get_status_flags() != FLASH_SR_EOP) { // operation went wrong
break;
}
}
flash_lock();
if (flash_size < DESIG_FLASH_SIZE * 1024) { // less than advertised size
return 0;
} else {
return flash_size / 1024;
}
}

7
lib/flash_internal.h
View File

@ -12,7 +12,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
/** library to read/write internal flash (API)
/** library to read/write internal flash
* @file
* @author King Kévin <kingkevin@cuvoodoo.info>
* @date 2016-2020
@ -57,3 +57,8 @@ bool flash_internal_eeprom_read(uint8_t *eeprom, uint16_t size);
* @return number of bytes written (including preserved data), or negative in case of error
*/
int32_t flash_internal_eeprom_write(const uint8_t *eeprom, uint16_t size);
/** probe the real size of the internal flash
* @return tested size (in KiB), or 0 if less than advertised
* @warning it will write the last page of the advertised size
*/
uint16_t flash_internal_probe_size(void);