/**
* @brief Initializes LEDs, SDRAM, touch screen, CRC and SRAM.
* @param None
* @retval None
*/
void k_BspInit(void)
{
/* Configure LED1, LED2, LED3 and LED4 */
BSP_LED_Init(LED1);
BSP_LED_Init(LED2);
BSP_LED_Init(LED3);
BSP_LED_Init(LED4);
/* Initialize the SDRAM */
BSP_SDRAM_Init();
/* Initialize the Touch screen */
BSP_TS_Init(480, 272);
/* Enable CRC to Unlock GUI */
__CRC_CLK_ENABLE();
/* Enable Back up SRAM */
__BKPSRAM_CLK_ENABLE();
}
void checkForBootLoaderRequest(void)
{
uint32_t bt;
__PWR_CLK_ENABLE();
__BKPSRAM_CLK_ENABLE();
HAL_PWR_EnableBkUpAccess();
bt = (*(__IO uint32_t *) (BKPSRAM_BASE + 4)) ;
if ( bt == 0xDEADBEEF ) {
(*(__IO uint32_t *) (BKPSRAM_BASE + 4)) = 0xCAFEFEED; // Reset our trigger
// Backup SRAM is write-back by default, ensure value actually reaches memory
// Another solution would be marking BKPSRAM as write-through in Memory Protection Unit settings
SCB_CleanDCache_by_Addr((uint32_t *) (BKPSRAM_BASE + 4), sizeof(uint32_t));
void (*SysMemBootJump)(void);
__SYSCFG_CLK_ENABLE();
SYSCFG->MEMRMP |= SYSCFG_MEM_BOOT_ADD0 ;
uint32_t p = (*((uint32_t *) 0x1ff00000));
__set_MSP(p); //Set the main stack pointer to its defualt values
SysMemBootJump = (void (*)(void)) (*((uint32_t *) 0x1ff00004)); // Point the PC to the System Memory reset vector (+4)
SysMemBootJump();
while (1);
}
}
/**
* @brief This function configures the system to enter Standby mode with RTC
* clocked by LSE or LSI and with Backup SRAM ON for current consumption
* measurement purpose.
* STANDBY Mode with RTC clocked by LSE/LSI and BKPSRAM
* ====================================================
* - RTC Clocked by LSE or LSI
* - Backup SRAM ON
* - IWDG OFF
* - Automatic Wakeup using RTC clocked by LSE/LSI (after ~20s)
* @param None
* @retval None
*/
void StandbyRTCBKPSRAMMode_Measure(void)
{
/* Configure RTC prescaler and RTC data registers as follow:
- Hour Format = Format 24
- Asynch Prediv = Value according to source clock
- Synch Prediv = Value according to source clock
- OutPut = Output Disable
- OutPutPolarity = High Polarity
- OutPutType = Open Drain */
RTCHandle.Instance = RTC;
RTCHandle.Init.HourFormat = RTC_HOURFORMAT_24;
RTCHandle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
RTCHandle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
RTCHandle.Init.OutPut = RTC_OUTPUT_DISABLE;
RTCHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
RTCHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
if(HAL_RTC_Init(&RTCHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*## Configure the Wake up timer ###########################################*/
/* RTC Wakeup Interrupt Generation:
Wakeup Time Base = (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSI))
Wakeup Time = Wakeup Time Base * WakeUpCounter
= (RTC_WAKEUPCLOCK_RTCCLK_DIV /(LSI)) * WakeUpCounter
==> WakeUpCounter = Wakeup Time / Wakeup Time Base
To configure the wake up timer to 20s the WakeUpCounter is set to 0xA017:
RTC_WAKEUPCLOCK_RTCCLK_DIV = RTCCLK_Div16 = 16
Wakeup Time Base = 16 /(~32.768KHz) = ~0,488 ms
Wakeup Time = ~20s = 0,488ms * WakeUpCounter
==> WakeUpCounter = ~20s/0,488ms = 40983 = 0xA017 */
/* Disable Wake-up timer */
if(HAL_RTCEx_DeactivateWakeUpTimer(&RTCHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
/*#### Clear all related wakeup flags ######################################*/
/* Clear PWR wake up Flag */
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
/* Clear RTC Wake Up timer Flag */
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&RTCHandle, RTC_FLAG_WUTF);
/*#### Setting the Wake up time ############################################*/
HAL_RTCEx_SetWakeUpTimer_IT(&RTCHandle, 0xA017, RTC_WAKEUPCLOCK_RTCCLK_DIV16);
/* Enable BKPRAM Clock */
__BKPSRAM_CLK_ENABLE();
/* Enable the Backup SRAM low power Regulator */
HAL_PWREx_EnableBkUpReg();
/*#### Enter the Standby mode ##############################################*/
/* Request to enter STANDBY mode */
HAL_PWR_EnterSTANDBYMode();
}