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spiFlash: add a workaround for microchip SST26VF032B / SST26VF032BA

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This commit is contained in:
Gwenhael Goavec-Merou
2021-05-05 06:59:02 +02:00
parent c82257c9ba
commit 6ae29125ed
2 changed files with 51 additions and 5 deletions
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src/spiFlash.cpp
+45 -5
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@@ -60,6 +60,12 @@
#define FLASH_WRVECR 0x61
#define FLASH_RDVECR 0x65
/* microchip SST26VF032B / SST26VF032BA */
/* Read Block Protection Register */
#define FLASH_RBPR 0x72
/* Global Block Protection unlock */
#define FLASH_ULBPR 0x98
SPIFlash::SPIFlash(SPIInterface *spi, int8_t verbose):_spi(spi), _verbose(verbose)
{
}
@@ -147,14 +153,23 @@ int SPIFlash::read(int base_addr, uint8_t *data, int len)
int SPIFlash::erase_and_prog(int base_addr, uint8_t *data, int len)
{
if (_jedec_id == 0)
read_id();
/* check Block Protect Bits */
uint8_t status = read_status_reg();
if ((status & 0x1c) !=0) {
if (write_enable() != 0)
return -1;
if (disable_protection() != 0)
if (_jedec_id == 0xbf2642bf) { // microchip SST26VF032B
if (!global_unlock())
return -1;
} else {
uint8_t status = read_status_reg();
if ((status & 0x1c) !=0) {
if (write_enable() != 0)
return -1;
if (disable_protection() != 0)
return -1;
}
}
ProgressBar progress("Writing", len, 50, _verbose < 0);
if (sectors_erase(base_addr, len) == -1)
return -1;
@@ -304,3 +319,28 @@ int SPIFlash::disable_protection()
} else
return 0;
}
/* microchip SST26VF032B has a dedicated register
* to read sectors (un)lock status and another one to unlock
* sectors
*/
bool SPIFlash::global_unlock()
{
if (write_enable() != 0)
return false;
_spi->spi_put(FLASH_ULBPR, NULL, NULL, 0);
if (_spi->spi_wait(FLASH_RDSR, 0xff, 0, 1000) < 0)
return false;
/* check if all sectors are unlocked */
uint8_t rx2[10];
_spi->spi_put(FLASH_RBPR, NULL, rx2, 10);
printf("Non Volatile\n");
for (int i = 0; i < 10; i++) {
if (rx2[i] != 0)
return false;
}
return true;
}