mhu/reflow-oven-control-sw
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Implement option byte writing and set brown out level

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This commit is contained in:
Mario Hüttel
2021-10-16 23:39:23 +02:00
parent decb484d06
commit eb41e5e210
2 changed files with 77 additions and 2 deletions
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46
stm-firmware/stm-periph/option-bytes.c
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@@ -21,6 +21,16 @@
#include <stm-periph/option-bytes.h>
#include <stm32/stm32f4xx.h>
/**
* @brief First key for unlocking hte option byte write access
*/
#define FLASH_OPTION_KEY1 (0x08192A3BUL)
/**
* @brief Second key for unlocking hte option byte write access
*/
#define FLASH_OPTION_KEY2 (0x4C5D6E7FUL)
void stm_option_bytes_read(struct option_bytes *opts)
{
uint32_t opt_reg;
@@ -39,10 +49,42 @@ void stm_option_bytes_read(struct option_bytes *opts)
int stm_option_bytes_program(const struct option_bytes *opts)
{
FLASH->OPTKEYR = 0x08192A3BUL;
FLASH->OPTKEYR = 0x4C5D6E7FUL;
uint32_t reg;
FLASH->OPTKEYR = FLASH_OPTION_KEY1;
FLASH->OPTKEYR = FLASH_OPTION_KEY2;
__DSB();
if (FLASH->OPTCR & FLASH_OPTCR_OPTLOCK) {
/* Unlocking failed */
return -1;
}
reg = FLASH->OPTCR;
reg &= ~FLASH_OPTCR_BOR_LEV;
reg &= ~FLASH_OPTCR_nRST_STDBY;
reg &= ~FLASH_OPTCR_nRST_STOP;
reg &= ~FLASH_OPTCR_nWRP;
reg &= ~FLASH_OPTCR_RDP;
reg &= ~FLASH_OPTCR_WDG_SW;
reg |= (opts->brown_out_level << 2) & FLASH_OPTCR_BOR_LEV;
reg |= (opts->nrst_standby << 7) & FLASH_OPTCR_nRST_STDBY;
reg |= (opts->nrst_stop << 6) & FLASH_OPTCR_nRST_STOP;
reg |= (opts->nwrpi << 16) & FLASH_OPTCR_nWRP;
reg |= (opts->read_protection << 8) & FLASH_OPTCR_RDP;
reg |= (opts->wdg_sw << 5) & FLASH_OPTCR_WDG_SW;
while (FLASH->SR & FLASH_SR_BSY);
FLASH->OPTCR = reg;
FLASH->OPTCR |= FLASH_OPTCR_OPTSTRT;
__DSB();
while (FLASH->SR & FLASH_SR_BSY);
FLASH->OPTCR |= FLASH_OPTCR_OPTLOCK;
__DSB();
return 0;
}