Implement option byte writing and set brown out level
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decb484d06
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@ -49,6 +49,7 @@
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#include <reflow-controller/temp-profile/temp-profile-executer.h>
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#include <reflow-controller/settings/spi-eeprom.h>
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#include <reflow-controller/main-cycle-counter.h>
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#include <stm-periph/option-bytes.h>
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static void setup_nvic_priorities(void)
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{
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@ -211,6 +212,35 @@ static inline void handle_boot_status(void)
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}
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}
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/**
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* @brief Read out the option bytes of the STM32 and program them to the desired values.
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*
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* - This function currently forces the brown out level to Level 3.
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*/
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static void check_and_program_opt_bytes(void)
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{
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struct option_bytes opts;
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int err;
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/** - Read option bytes */
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stm_option_bytes_read(&opts);
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if (opts.brown_out_level != 0) {
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/* Set the brown out level to level 3 => highest brown out limit. */
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opts.brown_out_level = 0;
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/** - Program the option bytes if brown out level was not set correctly */
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err = stm_option_bytes_program(&opts);
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/** - If programming failes, enter panic mode */
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if (err)
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panic_mode();
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/** - If programming is successful, reset the system to apply new settings */
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NVIC_SystemReset();
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}
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}
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/**
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* @brief Setup the system.
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*
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@ -220,6 +250,9 @@ static inline void setup_system(void)
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{
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float tmp;
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/** - Read the option bytes and if necessary program them to the desired values */
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check_and_program_opt_bytes();
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/** - Setup the NVIC priorities of the core peripherals using interrupts */
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setup_nvic_priorities();
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@ -21,6 +21,16 @@
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#include <stm-periph/option-bytes.h>
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#include <stm32/stm32f4xx.h>
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/**
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* @brief First key for unlocking hte option byte write access
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*/
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#define FLASH_OPTION_KEY1 (0x08192A3BUL)
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/**
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* @brief Second key for unlocking hte option byte write access
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*/
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#define FLASH_OPTION_KEY2 (0x4C5D6E7FUL)
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void stm_option_bytes_read(struct option_bytes *opts)
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{
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uint32_t opt_reg;
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@ -39,10 +49,42 @@ void stm_option_bytes_read(struct option_bytes *opts)
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int stm_option_bytes_program(const struct option_bytes *opts)
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{
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FLASH->OPTKEYR = 0x08192A3BUL;
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FLASH->OPTKEYR = 0x4C5D6E7FUL;
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uint32_t reg;
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FLASH->OPTKEYR = FLASH_OPTION_KEY1;
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FLASH->OPTKEYR = FLASH_OPTION_KEY2;
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__DSB();
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if (FLASH->OPTCR & FLASH_OPTCR_OPTLOCK) {
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/* Unlocking failed */
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return -1;
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}
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reg = FLASH->OPTCR;
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reg &= ~FLASH_OPTCR_BOR_LEV;
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reg &= ~FLASH_OPTCR_nRST_STDBY;
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reg &= ~FLASH_OPTCR_nRST_STOP;
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reg &= ~FLASH_OPTCR_nWRP;
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reg &= ~FLASH_OPTCR_RDP;
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reg &= ~FLASH_OPTCR_WDG_SW;
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reg |= (opts->brown_out_level << 2) & FLASH_OPTCR_BOR_LEV;
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reg |= (opts->nrst_standby << 7) & FLASH_OPTCR_nRST_STDBY;
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reg |= (opts->nrst_stop << 6) & FLASH_OPTCR_nRST_STOP;
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reg |= (opts->nwrpi << 16) & FLASH_OPTCR_nWRP;
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reg |= (opts->read_protection << 8) & FLASH_OPTCR_RDP;
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reg |= (opts->wdg_sw << 5) & FLASH_OPTCR_WDG_SW;
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while (FLASH->SR & FLASH_SR_BSY);
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FLASH->OPTCR = reg;
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FLASH->OPTCR |= FLASH_OPTCR_OPTSTRT;
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__DSB();
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while (FLASH->SR & FLASH_SR_BSY);
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FLASH->OPTCR |= FLASH_OPTCR_OPTLOCK;
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__DSB();
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return 0;
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}
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