SVS in ARM Micro-controllers

henriaghaei · ‎2016-10-05

Posted on October 05, 2016 at 15:26

Unfortunately, I am sort of thinking of using SVS (Supply Voltage Supervisor) in my STM32f107kc. Why am I saying like this. Because, I am not entirely too sure my flash store my data without having power. Assuming it does not so, I am familiar with SVS in MSP micro-controllers. However, in STM32f107kc as I found out I have the following registers to control the power.

/******************************************************************************/

/* */

/* Power Control */

/* */

/******************************************************************************/

/******************** Bit definition for PWR_CR register ********************/

&sharpdefine PWR_CR_LPDS ((uint16_t)0x0001) /*!< Low-Power Deepsleep */

&sharpdefine PWR_CR_PDDS ((uint16_t)0x0002) /*!< Power Down Deepsleep */

&sharpdefine PWR_CR_CWUF ((uint16_t)0x0004) /*!< Clear Wakeup Flag */

&sharpdefine PWR_CR_CSBF ((uint16_t)0x0008) /*!< Clear Standby Flag */

&sharpdefine PWR_CR_PVDE ((uint16_t)0x0010) /*!< Power Voltage Detector Enable */

&sharpdefine PWR_CR_PLS ((uint16_t)0x00E0) /*!< PLS[2:0] bits (PVD Level Selection) */

&sharpdefine PWR_CR_PLS_0 ((uint16_t)0x0020) /*!< Bit 0 */

&sharpdefine PWR_CR_PLS_1 ((uint16_t)0x0040) /*!< Bit 1 */

&sharpdefine PWR_CR_PLS_2 ((uint16_t)0x0080) /*!< Bit 2 */

/*!< PVD level configuration */

&sharpdefine PWR_CR_PLS_2V2 ((uint16_t)0x0000) /*!< PVD level 2.2V */

&sharpdefine PWR_CR_PLS_2V3 ((uint16_t)0x0020) /*!< PVD level 2.3V */

&sharpdefine PWR_CR_PLS_2V4 ((uint16_t)0x0040) /*!< PVD level 2.4V */

&sharpdefine PWR_CR_PLS_2V5 ((uint16_t)0x0060) /*!< PVD level 2.5V */

&sharpdefine PWR_CR_PLS_2V6 ((uint16_t)0x0080) /*!< PVD level 2.6V */

&sharpdefine PWR_CR_PLS_2V7 ((uint16_t)0x00A0) /*!< PVD level 2.7V */

&sharpdefine PWR_CR_PLS_2V8 ((uint16_t)0x00C0) /*!< PVD level 2.8V */

&sharpdefine PWR_CR_PLS_2V9 ((uint16_t)0x00E0) /*!< PVD level 2.9V */

&sharpdefine PWR_CR_DBP ((uint16_t)0x0100) /*!< Disable Backup Domain write protection */

/******************* Bit definition for PWR_CSR register ********************/

&sharpdefine PWR_CSR_WUF ((uint16_t)0x0001) /*!< Wakeup Flag */

&sharpdefine PWR_CSR_SBF ((uint16_t)0x0002) /*!< Standby Flag */

&sharpdefine PWR_CSR_PVDO ((uint16_t)0x0004) /*!< PVD Output */

&sharpdefine PWR_CSR_EWUP ((uint16_t)0x0100) /*!< Enable WKUP pin */

That I am not familiar with them entirely. On the other hand, in MSP I had to have the following code to enable SVS.

if (SVSCTL&SVSFG){ // If the power goes off

FlshCarma( total_consumed_active_energy ); // Store the lost number here

SVSCTL |= PORON; // enable POR

}

So, I am just wondering what are the major registers I am required to use to enable my SVS in ARM. Any working examples you may suggest?

Thanks!

#stm32f #svs

Walid FTITI_O · ‎2016-10-05

Posted on October 05, 2016 at 18:55

Hi CaEngineer,

The device features an embedded programmable voltage detector (PVD) that monitors the

VDD/VDDA power supply and compares it to the VPVD threshold. An interrupt can be generated when VDD/VDDA drops below the VPVD threshold and/or when VDD/VDDA is higher than the VPVD threshold. The interrupt service routine can then generate a warning message and/or put the MCU into a safe state. The PVD is enabled by software.

I think you are using the

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32054.html

, you would check the PVD firmware example at this path: STM32F10x_StdPeriph_Lib_V3.5.0\Project\STM32F10x_StdPeriph_Examples\PWR\PVD

-Hannibal-