Nucleo-L432KC store data in Flash using mbed

Question

Posted on December 15, 2017 at 05:11Hello,I am using my Nucleo-L432KC for a project and my client wants to use mbed online compiler. I am trying to save some variables into the flash memory (because there is no EEPROM) and unfortunately there is no library for this on mbed. Can the FLASH_WriteProtection and FLASH_EraseProgram example of CubeMX help me with this? I saw some functions about writing into the Flash memory but I haven't seen those to read from Flash. Where should I start to write this library for my own?Can any one please show me some ways or give me some advices? Thank you very much.\Duy#nucleo-l432kc-flash #flash #nucleo-l432kc #stm32l4

Geoffrey1 · Answer

Posted on December 15, 2017 at 12:48Here's the C code I use (not in mbed) on the stm32l432. You'll need to include the appropriate header file and change the interface for C++. I'd view this as a rough starting point and not production code.#define FLASH_KEY1 ((uint32_t)0x45670123U) /*!< Flash key1 */#define FLASH_KEY2 ((uint32_t)0xCDEF89ABU) /*!< Flash key2: used with FLASH_KEY1 */static inline uint32_t FLASH_Errors(void) { return FLASH->SR & (FLASH_SR_EOP | FLASH_SR_OPERR | FLASH_SR_PROGERR | FLASH_SR_WRPERR | FLASH_SR_PGAERR | FLASH_SR_SIZERR | FLASH_SR_PGSERR | FLASH_SR_MISERR | FLASH_SR_FASTERR | FLASH_SR_RDERR | FLASH_SR_OPTVERR);}static inline void FLASH_ClearAllErrors(void) { SET_BIT(FLASH->SR, FLASH_SR_EOP | FLASH_SR_OPERR | FLASH_SR_PROGERR | FLASH_SR_WRPERR | FLASH_SR_PGAERR | FLASH_SR_SIZERR | FLASH_SR_PGSERR | FLASH_SR_MISERR | FLASH_SR_FASTERR | FLASH_SR_RDERR | FLASH_SR_OPTVERR); SET_BIT(FLASH->ECCR, FLASH_ECCR_ECCC | FLASH_ECCR_ECCD);}uint32_t flash_err = 0;void FLASH_PageErase(uint32_t Page) { // Check and clear all error programming flags // due to a previous programming. If not, PGSERR is set. FLASH_ClearAllErrors(); // set up write Page &= 255; // clear any invalid bits MODIFY_REG(FLASH->CR, FLASH_CR_PNB, (Page << POSITION_VAL(FLASH_CR_PNB))); SET_BIT(FLASH->CR, FLASH_CR_PER); SET_BIT(FLASH->CR, FLASH_CR_STRT); while (FLASH->SR & FLASH_SR_BSY); CLEAR_BIT(FLASH->CR, FLASH_CR_PER); flash_err = FLASH_Errors();}void FLASH_Unlock(void){ // Authorize the FLASH Registers access WRITE_REG(FLASH->KEYR, FLASH_KEY1); WRITE_REG(FLASH->KEYR, FLASH_KEY2);}void FLASH_Lock(void){ // Set the LOCK Bit to lock the FLASH Registers access SET_BIT(FLASH->CR, FLASH_CR_LOCK);}// See page 82 of reference manualvoid FLASH_Program_DoubleWord(uint32_t Address, uint32_t Data0, uint32_t Data1){ // only aligned addresses if (Address & 0x7) return; FLASH_ClearAllErrors(); // Set PG bit SET_BIT(FLASH->CR, FLASH_CR_PG); // Program the double word *(__IO uint32_t*)Address = Data0; *(__IO uint32_t*)(Address+4) = Data1; while (FLASH->SR & FLASH_SR_BSY); // Check that EOP flag is set in the FLASH_SR register // (meaning that the programming operation has succeed), and clear it by software. if (FLASH->SR & FLASH_SR_EOP) CLEAR_BIT(FLASH->SR, FLASH_SR_EOP); // Reset PG bit CLEAR_BIT(FLASH->CR, FLASH_CR_PG); flash_err = FLASH_Errors()

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