There are two ways of emulating EEPROM on the STM32F4:
The second option is described here: AN3969.
But google, unfortunately, hasn't been able to provide information on how to use the first option - using the 4Kb of backup SRAM as EEPROM?..
Can anyone help on the topic?
must do these:
Enable the PWR clock
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
Enable access to the backup domain
PWR_BackupAccessCmd(ENABLE);
Enable backup SRAM Clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_BKPSRAM, ENABLE);
Enable the Backup SRAM low power Regulator to retain it's content in VBAT mode
PWR_BackupRegulatorCmd(ENABLE);
and you can write/read datas to sram (these codes from BKP_Domain codes in STM32F4xx_DSP_StdPeriph_Lib) (in my mcu stm32f417 BKPSRAM_BASE=0x40024000)
// Write to Backup SRAM with 32-Bit Data
for (i = 0x0; i < 0x100; i += 4) {
*(__IO uint32_t *) (BKPSRAM_BASE + i) = i;
}
// Check the written Data
for (i = 0x0; i < 0x100; i += 4) {
if ((*(__IO uint32_t *) (BKPSRAM_BASE + i)) != i){
errorindex++;
}
}
then if you want:
// Wait until the Backup SRAM low power Regulator is ready
while(PWR_GetFlagStatus(PWR_FLAG_BRR) == RESET)
{}
you can find these functions in STM32F4xx_DSP_StdPeriph_Lib.