STM8S_StdPeriph_Examples/AWU/AWU_ActiveHaltMode/main.c

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/**
  ******************************************************************************
  * @file    AWU_ActiveHaltMode\main.c
  * @author  MCD Application Team
  * @version  V2.2.0
  * @date     30-September-2014
  * @brief   This file contains the main function for AWU Active Halt Mode example.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8s.h"
#include "stm8s_eval.h"
#include "stm8s_eval_lcd.h"

/**
  * @addtogroup AWU_ActiveHaltMode
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Global variables ----------------------------------------------------------*/
bool ButtonPressed = FALSE;
/* Private function prototypes -----------------------------------------------*/
void Delay (uint16_t nCount);
uint32_t LSIMeasurment(void);
static void CLK_Config(void);
void AWU_Config(void);
static void GPIO_Config(void);
static void LCD_Config(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief Example main entry point.
  * @param  None
  * @retval None
  */
void main(void)
{
    uint16_t i = 0;
    uint16_t j = 0;
   
    /* Clock configuration -----------------------------------------*/
    CLK_Config();
    
    /* GPIO Configuration ---------------------------------------*/
    GPIO_Config();

    /* Configure LCD mounted on STM8-128 EVAL board ----------------*/
    LCD_Config();
    
    /*AWU configuration --------------------------------------------*/
    AWU_Config();

    /* Enable general interrupts */
    enableInterrupts();

    while (1)
    {
        /* Check button status */
        if (ButtonPressed == TRUE) /* Button is pressed */
        {

            ButtonPressed = FALSE;

            /* Clear LCD */
            LCD_Clear();
            LCD_SetCursorPos(LCD_LINE1, 0);
            LCD_Print(" Preparing to ");
            LCD_SetCursorPos(LCD_LINE2, 0);
            LCD_Print("    sleep...  ");

            /* LEDs toggle quickly */
            for (j = 0; j < 20; j++)
            {
                STM_EVAL_LEDToggle(LED1);
                STM_EVAL_LEDToggle(LED2);
                STM_EVAL_LEDToggle(LED3);
                STM_EVAL_LEDToggle(LED4);
                for (i = 0; i < 2; i++)
                {
                    Delay((uint16_t)60000);
                }
            }

            /* Switch LEDs OFF */
            STM_EVAL_LEDOff(LED1);
            STM_EVAL_LEDOff(LED2);
            STM_EVAL_LEDOff(LED3);
            STM_EVAL_LEDOff(LED4);
            
            /* Clear LCD */
            LCD_Clear();

            halt(); /* Program halted */

            /* Program re-starts here, thanks to AWU */
            LCD_Clear();
            
            /* Print "Running..." on LCD line1*/
            LCD_SetCursorPos(LCD_LINE1, 0);
            LCD_Print("  Running...  ");
            /* Print "Press Key" on LCD line2*/
            LCD_SetCursorPos(LCD_LINE2, 0);
            LCD_Print("  Press Key   ");
        }
        else
        {
            /* Toggle LEDs slowly */
            STM_EVAL_LEDToggle(LED1);
            STM_EVAL_LEDToggle(LED2);
            STM_EVAL_LEDToggle(LED3);
            STM_EVAL_LEDToggle(LED4);
            for (i = 0; i < 15; i++)
            {
                Delay((uint16_t)60000);
            }
        }
    }
}

/**
  * @brief  Configure system clock to run at 16Mhz
  * @param  None
  * @retval None
  */
static void CLK_Config(void)
{
    /* Initialization of the clock */
    /* Clock divider to HSI/1 */
    CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);
}

/**
  * @brief  Configure the AWU time base to 12s
  * @param  None
  * @retval None
  */
void AWU_Config(void)
{
    /* Initialization of AWU */
     /* LSI calibration for accurate auto wake up time base*/
    AWU_LSICalibrationConfig(LSIMeasurment());
    
     /* The delay corresponds to the time we will stay in Halt mode */
    AWU_Init(AWU_TIMEBASE_12S);
}

/**
  * @brief  Configure GPIO for LEDs and buttons available on the evaluation board
  * @param  None
  * @retval None
  */
static void GPIO_Config(void)
{
    /* Initialize LEDs mounted on STM8-128 EVAL board */
    STM_EVAL_LEDInit(LED1);
    STM_EVAL_LEDInit(LED2);
    STM_EVAL_LEDInit(LED3);
    STM_EVAL_LEDInit(LED4);

    /* Initialize KEY pushbutton mounted on STM8-128 EVAL board */
    STM_EVAL_PBInit(BUTTON_KEY, BUTTON_MODE_EXTI);
}

/**
  * @brief  Configure the LCD available on the evaluation board
  * @param  None
  * @retval None
  */
static void LCD_Config(void)
{
    /* Init the Eval board LCD */
    STM8S_EVAL_LCD_Init();

    /* Clear LCD */
    LCD_Clear();
 
    /* Print "Running..." on LCD line1*/
    LCD_SetCursorPos(LCD_LINE1, 0);
    LCD_Print("  Running...  ");
    /* Print "Press Key" on LCD line2*/
    LCD_SetCursorPos(LCD_LINE2, 0);
    LCD_Print("  Press Key   ");
}

/**
  * @brief  Measure the LSI frequency using timer IC1 and update the calibration registers.
  * @note   It is recommended to use a timer clock frequency of at least 10MHz in order 
        *         to obtain a better in the LSI frequency measurement.
        * @param  None
  * @retval None
  */
uint32_t LSIMeasurment(void)
{
  
  uint32_t lsi_freq_hz = 0x0;
  uint32_t fmaster = 0x0;
  uint16_t ICValue1 = 0x0;
  uint16_t ICValue2 = 0x0;

  /* Get master frequency */
  fmaster = CLK_GetClockFreq();

  /* Enable the LSI measurement: LSI clock connected to timer Input Capture 1 */
  AWU->CSR |= AWU_CSR_MSR;

#if defined (STM8S903) || defined (STM8S103) || defined (STM8S003)
  /* Measure the LSI frequency with TIMER Input Capture 1 */
  
  /* Capture only every 8 events!!! */
  /* Enable capture of TI1 */
        TIM1_ICInit(TIM1_CHANNEL_1, TIM1_ICPOLARITY_RISING, TIM1_ICSELECTION_DIRECTTI, TIM1_ICPSC_DIV8, 0);
        
  /* Enable TIM1 */
  TIM1_Cmd(ENABLE);
  
  /* wait a capture on cc1 */
  while((TIM1->SR1 & TIM1_FLAG_CC1) != TIM1_FLAG_CC1);
  /* Get CCR1 value*/
  ICValue1 = TIM1_GetCapture1();
  TIM1_ClearFlag(TIM1_FLAG_CC1);
  
  /* wait a capture on cc1 */
  while((TIM1->SR1 & TIM1_FLAG_CC1) != TIM1_FLAG_CC1);
  /* Get CCR1 value*/
  ICValue2 = TIM1_GetCapture1();
  TIM1_ClearFlag(TIM1_FLAG_CC1);
  
  /* Disable IC1 input capture */
  TIM1->CCER1 &= (uint8_t)(~TIM1_CCER1_CC1E);
  /* Disable timer2 */
  TIM1_Cmd(DISABLE);
  
#else  
  /* Measure the LSI frequency with TIMER Input Capture 1 */
  
  /* Capture only every 8 events!!! */
  /* Enable capture of TI1 */
  TIM3_ICInit(TIM3_CHANNEL_1, TIM3_ICPOLARITY_RISING, TIM3_ICSELECTION_DIRECTTI, TIM3_ICPSC_DIV8, 0);

  /* Enable TIM3 */
  TIM3_Cmd(ENABLE);

        /* wait a capture on cc1 */
  while ((TIM3->SR1 & TIM3_FLAG_CC1) != TIM3_FLAG_CC1);
        /* Get CCR1 value*/
  ICValue1 = TIM3_GetCapture1();
  TIM3_ClearFlag(TIM3_FLAG_CC1);

  /* wait a capture on cc1 */
  while ((TIM3->SR1 & TIM3_FLAG_CC1) != TIM3_FLAG_CC1);
    /* Get CCR1 value*/
  ICValue2 = TIM3_GetCapture1();
        TIM3_ClearFlag(TIM3_FLAG_CC1);

  /* Disable IC1 input capture */
  TIM3->CCER1 &= (uint8_t)(~TIM3_CCER1_CC1E);
  /* Disable timer3 */
  TIM3_Cmd(DISABLE);
#endif /* STM8S903 || STM8S103*/

  /* Compute LSI clock frequency */
  lsi_freq_hz = (8 * fmaster) / (ICValue2 - ICValue1);
  
  /* Disable the LSI measurement: LSI clock disconnected from timer Input Capture 1 */
  AWU->CSR &= (uint8_t)(~AWU_CSR_MSR);

 return (lsi_freq_hz);
}

/**
  * @brief Delay.
  * @param nCount
  * @retval None
  */
void Delay(uint16_t nCount)
{
    /* Decrement nCount value */
    while (nCount != 0)
    {
        nCount--;
    }
}
#ifdef USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t 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

/**
  * @}
  */


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