AN4228 datasheet(62/90 Pages) STMICROELECTRONICS

62 / 90 page

Firmware migration using the library

AN4228

62/90

DocID024110 Rev 5

BKP_WriteBackupRegister(BKP_DR1, 0x3210);

/* Read data from Backup data register 1 */

BKPdata = BKP_ReadBackupRegister(BKP_DR1);

In STM32F3 series, you have to update this code as follows:

uint16_t BKPdata = 0;

...

/* PWR Clock Enable */

_APB1PeriphClockCmd(_APB1Periph_PWR, ENABLE);

/* Enable write access to RTC domain */

PWR_RTCAccessCmd(ENABLE);

/* Write data to Backup data register 1 */

RTC_WriteBackupRegister(RTC_BKP_DR1, 0x3220);

/* Read data from Backup data register 1 */

BKPdata = RTC_ReadBackupRegister(RTC_BKP_DR1);

The main changes in the source code in STM32F3 series versus STM32F1 series are

described below:



There is no BKP peripheral



Write to/read from Backup data registers are performed through the RTC driver



Backup data registers naming changed from BKP_DRx to RTC_BKP_DRx, and

numbering starts from 0 instead of 1.

4.12

CEC application code

You can easily update your CEC application code by replacing STM32F10x functions by the

corresponding function of the STM32F3xx library.

The table below presents the CEC driver API correspondence between STM32F10x and

STM32F37x Libraries.

AN4228 Datasheet(PDF) 62 Page - STMicroelectronics