path: root/src/stm32lib/examples/NVIC/DMA_WFIMode/main.c

/******************** (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 "platform_config.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define USART1_DR_Address    0x40013804

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
NVIC_InitTypeDef  NVIC_InitStructure;
DMA_InitTypeDef  DMA_InitStructure;

vu32 LowPowerMode = 0;
u16 DST_Buffer[10]= {0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void EXTI_Configuration(void);
void DMA_Configuration(void);
void USART_Configuration(void);
u8 Buffercmp16(u16* pBuffer1, u16* pBuffer2, u16 BufferLength);
void Delay(vu32 nCount);

/* Private functions ---------------------------------------------------------*/

/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* Configure the system clocks */
  RCC_Configuration();

  /* Configure GPIOs */
  GPIO_Configuration();

  /* Configures the EXTI Lines */
  EXTI_Configuration();
  
  /* Configures the DMA Channel */
  DMA_Configuration();
  
  /* Configures the USART1 */
  USART_Configuration();
    
#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

  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  
  /* Enable the DMA1 Channel 5 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the EXTI9_5  Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_Init(&NVIC_InitStructure);
    
  while (1)
  {
    if(LowPowerMode == 1)
    {

      GPIO_ResetBits(GPIO_LED, GPIO_Pin_7 | GPIO_Pin_8);

      /* Request to enter WFI mode */
      __WFI();
      LowPowerMode = 0;
    }

    Delay(0xFFFFF);
    GPIO_WriteBit(GPIO_LED, GPIO_Pin_6, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIO_LED, GPIO_Pin_6)));
  }
}

/*******************************************************************************
* 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 USART1, GPIOA, GPIO_LED, GPIO_KEY_BUTTON and AFIO clocks */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | 
                         RCC_APB2Periph_GPIO_LED | RCC_APB2Periph_GPIO_KEY_BUTTON |
                         RCC_APB2Periph_AFIO, ENABLE);  

  /* DMA1 clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the used GPIO pins.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

  /* Configure GPIO_LED Pin 6, GPIO_LED Pin 7 and GPIO_LED Pin 8 as
     Output push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 |GPIO_Pin_7 | GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIO_LED, &GPIO_InitStructure);
  
  /* Configure USART1 Rx (PA.10) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure GPIO KEY Button Pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_PIN_KEY_BUTTON;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIO_KEY_BUTTON, &GPIO_InitStructure);  
}

/*******************************************************************************
* Function Name  : EXTI_Configuration
* Description    : Configures the used EXTI line.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;

  /* Connect KEY Button EXTI Line to GPIO KEY Button Pin */
  GPIO_EXTILineConfig(GPIO_PORT_SOURCE_KEY_BUTTON, GPIO_PIN_SOURCE_KEY_BUTTON);

  /* Configure KEY Button EXTI Line to generate an interrupt on falling edge */  
  EXTI_InitStructure.EXTI_Line = EXTI_LINE_KEY_BUTTON;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);  
}

/*******************************************************************************
* Function Name  : DMA_Configuration
* Description    : Configures the used DMA Channel.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void DMA_Configuration(void)
{
  DMA_InitTypeDef  DMA_InitStructure;

  /* DMA1 Channel5 Config */
  DMA_DeInit(DMA1_Channel5);
  DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)DST_Buffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 10;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);

  /* Enable Channel5 Transfer complete interrupt */
  DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
  
  /* DMA1 Channel5 enable */
  DMA_Cmd(DMA1_Channel5, ENABLE);
}

/*******************************************************************************
* Function Name  : USART_Configuration
* Description    : Configures the USART1.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void USART_Configuration(void)
{
  USART_InitTypeDef  USART_InitStructure;

/* USART1 configuration ------------------------------------------------------*/
  /* USART1 configured as follow:
        - BaudRate = 9600 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

  USART_Init(USART1, &USART_InitStructure);
  
  USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
  
  /* Enable the USART1 */  
  USART_Cmd(USART1, ENABLE);
}

/*******************************************************************************
* Function Name  : Buffercmp16
* Description    : Compares two buffers.
* Input          : - pBuffer1, pBuffer2: buffers to be compared.
*                : - BufferLength: buffer's length
* Output         : None
* Return         : 0: pBuffer1 identical to pBuffer2
*                  1: pBuffer1 differs from pBuffer2
*******************************************************************************/
u8 Buffercmp16(u16* pBuffer1, u16* pBuffer2, u16 BufferLength)
{
  while(BufferLength--)
  {
    if(*pBuffer1 != *pBuffer2)
    {
      return 1;
    }

    pBuffer1++;
    pBuffer2++;
  }
  return 0;
}

/*******************************************************************************
* Function Name  : Delay
* Description    : Inserts a delay time.
* Input          : nCount: specifies the delay time length.
* Output         : None
* Return         : None
*******************************************************************************/
void Delay(vu32 nCount)
{
  for(; nCount != 0; nCount--);
}

#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****/