diff options
Diffstat (limited to 'src/stm32lib/examples/RTC/LSI_Calib/main.c')
| -rwxr-xr-x | src/stm32lib/examples/RTC/LSI_Calib/main.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/src/stm32lib/examples/RTC/LSI_Calib/main.c b/src/stm32lib/examples/RTC/LSI_Calib/main.c new file mode 100755 index 0000000..612bb5f --- /dev/null +++ b/src/stm32lib/examples/RTC/LSI_Calib/main.c @@ -0,0 +1,323 @@ +/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
+* File Name : main.c
+* Author : MCD Application Team
+* Version : V2.0.1
+* Date : 06/13/2008
+* Description : Main program body
+********************************************************************************
+* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
+* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
+* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
+* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
+* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+*******************************************************************************/
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f10x_lib.h"
+#include <stdio.h>
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+#define RTCClockOutput_Enable /* RTC Clock/64 is output on tamper pin(PC.13) */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+ErrorStatus HSEStartUpStatus;
+
+TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
+TIM_ICInitTypeDef TIM_ICInitStructure;
+RCC_ClocksTypeDef RCC_Clocks;
+vu32 PeriodValue = 0, LsiFreq = 0;
+vu32 OperationComplete = 0;
+
+/* Private function prototypes -----------------------------------------------*/
+void RCC_Configuration(void);
+void GPIO_Configuration(void);
+void RTC_Configuration(void);
+void NVIC_Configuration(void);
+
+/* Private functions ---------------------------------------------------------*/
+/*******************************************************************************
+* Function Name : main
+* Description : Main program.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+int main(void)
+{
+#ifdef DEBUG
+ debug();
+#endif
+
+ /* System Clocks Configuration */
+ RCC_Configuration();
+
+ /* NVIC configuration */
+ NVIC_Configuration();
+
+ /* Configure the GPIOs */
+ GPIO_Configuration();
+
+ /* RTC Configuration */
+ RTC_Configuration();
+
+ /* Wait until Key Push button is pressed */
+ while (GPIO_ReadInputDataBit(GPIOG, GPIO_Pin_8) != 0)
+ {}
+
+ /* Get the Frequency value */
+ RCC_GetClocksFreq(&RCC_Clocks);
+
+ /* Enable TIM5 APB1 clocks */
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
+
+ /* Connect internally the TM5_CH4 Input Capture to the LSI clock output */
+ GPIO_PinRemapConfig(GPIO_Remap_TIM5CH4_LSI, ENABLE);
+
+ /* TIM5 Time base configuration */
+ TIM_TimeBaseStructure.TIM_Prescaler = 0;
+ TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
+ TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
+ TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
+ TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure);
+
+ /* TIM5 Channel4 Input capture Mode configuration */
+ TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;
+ TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
+ TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
+ TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
+ TIM_ICInitStructure.TIM_ICFilter = 0;
+ TIM_ICInit(TIM5, &TIM_ICInitStructure);
+
+ /* Reinitialize the index for the interrupt */
+ OperationComplete = 0;
+
+ /* Enable the TIM5 Input Capture counter */
+ TIM_Cmd(TIM5, ENABLE);
+ /* Reset all TIM5 flags */
+ TIM5->SR = 0;
+ /* Enable the TIM5 channel 4 */
+ TIM_ITConfig(TIM5, TIM_IT_CC4, ENABLE);
+
+ /* Wait the TIM5 measuring operation to be completed */
+ while (OperationComplete != 2)
+ {}
+
+ /* Compute the actual frequency of the LSI. (TIM5_CLK = 2 * PCLK1) */
+ if (PeriodValue != 0)
+ {
+ LsiFreq = (u32)((u32)(RCC_Clocks.PCLK1_Frequency * 2) / (u32)PeriodValue);
+ }
+
+ /* Adjust the RTC prescaler value */
+ RTC_SetPrescaler(LsiFreq - 1);
+
+ /* Wait until last write operation on RTC registers has finished */
+ RTC_WaitForLastTask();
+
+ /* Set GPIOF pin 7 */
+ GPIO_SetBits(GPIOF, GPIO_Pin_7);
+
+ while (1)
+ {
+ /* Inifinite loop */
+ }
+
+}
+
+/*******************************************************************************
+* Function Name : RCC_Configuration
+* Description : Configures the different system clocks.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void RCC_Configuration(void)
+{
+ /* RCC system reset(for debug purpose) */
+ RCC_DeInit();
+
+ /* Enable HSE */
+ RCC_HSEConfig(RCC_HSE_ON);
+
+ /* Wait till HSE is ready */
+ HSEStartUpStatus = RCC_WaitForHSEStartUp();
+
+ if (HSEStartUpStatus == SUCCESS)
+ {
+ /* Enable Prefetch Buffer */
+ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
+
+ /* Flash 2 wait state */
+ FLASH_SetLatency(FLASH_Latency_2);
+
+ /* HCLK = SYSCLK */
+ RCC_HCLKConfig(RCC_SYSCLK_Div1);
+
+ /* PCLK2 = HCLK */
+ RCC_PCLK2Config(RCC_HCLK_Div1);
+
+ /* PCLK1 = HCLK/2 */
+ RCC_PCLK1Config(RCC_HCLK_Div2);
+
+ /* PLLCLK = 8MHz * 9 = 72 MHz */
+ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
+
+ /* Enable PLL */
+ RCC_PLLCmd(ENABLE);
+
+ /* Wait till PLL is ready */
+ while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
+ {}
+
+ /* Select PLL as system clock source */
+ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
+
+ /* Wait till PLL is used as system clock source */
+ while (RCC_GetSYSCLKSource() != 0x08)
+ {}
+ }
+
+ /* Enable GPIOG, GPIOF and AFIO clocks */
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG | RCC_APB2Periph_GPIOF
+ | RCC_APB2Periph_AFIO, ENABLE);
+}
+
+/*******************************************************************************
+* Function Name : NVIC_Configuration
+* Description : Configures the nested vectored interrupt controller.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void NVIC_Configuration(void)
+{
+ NVIC_InitTypeDef NVIC_InitStructure;
+
+#ifdef VECT_TAB_RAM
+ /* Set the Vector Table base location at 0x20000000 */
+ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
+#else /* VECT_TAB_FLASH */
+ /* Set the Vector Table base location at 0x08000000 */
+ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
+#endif
+
+ /* Configure one bit for preemption priority */
+ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
+
+ /* Enable the RTC Interrupt */
+ NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQChannel;
+ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
+ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
+ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+ NVIC_Init(&NVIC_InitStructure);
+
+ /* Enable the TIM5 Interrupt */
+ NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQChannel;
+ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
+ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
+ NVIC_Init(&NVIC_InitStructure);
+}
+
+/*******************************************************************************
+* Function Name : GPIO_Configuration
+* Description : Configures the different GPIO ports.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void GPIO_Configuration(void)
+{
+ GPIO_InitTypeDef GPIO_InitStructure;
+
+ /* Configure GPIOF pin 6 and pin 7 as Output push-pull */
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+ GPIO_Init(GPIOF, &GPIO_InitStructure);
+
+ /* Configure Key Button GPIO Pin as input floating */
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
+ GPIO_Init(GPIOG, &GPIO_InitStructure);
+}
+
+/*******************************************************************************
+* Function Name : RTC_Configuration
+* Description : Configures the RTC.
+* Input : None
+* Output : None
+* Return : None
+*******************************************************************************/
+void RTC_Configuration(void)
+{
+ /* Enable PWR and BKP clocks */
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
+
+ /* Allow access to BKP Domain */
+ PWR_BackupAccessCmd(ENABLE);
+
+ /* Reset Backup Domain */
+ BKP_DeInit();
+
+ /* Enable the LSI OSC */
+ RCC_LSICmd(ENABLE);
+ /* Wait till LSI is ready */
+ while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
+ {}
+ /* Select the RTC Clock Source */
+ RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
+
+ /* Enable RTC Clock */
+ RCC_RTCCLKCmd(ENABLE);
+
+ /* Wait for RTC registers synchronization */
+ RTC_WaitForSynchro();
+
+ /* Wait until last write operation on RTC registers has finished */
+ RTC_WaitForLastTask();
+
+ /* Enable the RTC Second */
+ RTC_ITConfig(RTC_IT_SEC, ENABLE);
+
+ /* Wait until last write operation on RTC registers has finished */
+ RTC_WaitForLastTask();
+
+ /* Set RTC prescaler: set RTC period to 1sec */
+ RTC_SetPrescaler(40000);
+
+ /* Wait until last write operation on RTC registers has finished */
+ RTC_WaitForLastTask();
+
+ /* To output second signal on Tamper pin, the tamper functionality
+ must be disabled (by default this functionality is disabled) */
+ BKP_TamperPinCmd(DISABLE);
+
+ /* Enable the RTC Second Output on Tamper Pin */
+ BKP_RTCOutputConfig(BKP_RTCOutputSource_Second);
+}
+
+#ifdef DEBUG
+/*******************************************************************************
+* Function Name : assert_failed
+* Description : Reports the name of the source file and the source line number
+* where the assert_param error has occurred.
+* Input : - file: pointer to the source file name
+* - line: assert_param error line source number
+* Output : None
+* Return : None
+*******************************************************************************/
+void assert_failed(u8* file, u32 line)
+{
+ /* User can add his own implementation to report the file name and line number,
+ ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
+
+ /* Infinite loop */
+ while (1)
+ {}
+}
+#endif
+
+/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/
|