main.c

STM32 库文件

/**
  ******************************************************************************
  * @file I2C/SMBus/main.c 
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  Main program body
  ******************************************************************************
  * @copy
  *
  * 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.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"

/** @addtogroup StdPeriph_Examples
  * @{
  */

/** @addtogroup I2C_SMBus
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define I2C1_SLAVE_ADDRESS7    0x10
#define I2C2_SLAVE_ADDRESS7    0x30
#define SMBusDefaultHeader     0xC2
#define Command                0x01
#define ClockSpeed             20000

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
I2C_InitTypeDef  I2C_InitStructure;
__IO uint8_t ReceivedCommand = 0, PECValue = 0;
volatile FlagStatus Status = RESET;
    
/* Private functions ---------------------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);

/**
  * @brief  Main program
  * @param  None
  * @retval : None
  */
int main(void)
{
  /* System clocks configuration ---------------------------------------------*/
  RCC_Configuration();
  
  /* GPIO configuration ------------------------------------------------------*/
  GPIO_Configuration();

  /* Enable I2C1 and I2C2 ----------------------------------------------------*/
  I2C_Cmd(I2C1, ENABLE);
  I2C_Cmd(I2C2, ENABLE);

  /* I2C1 configuration: SMBus Host ------------------------------------------*/
  I2C_InitStructure.I2C_Mode = I2C_Mode_SMBusHost;
  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
  I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7;
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_ClockSpeed = ClockSpeed;
  I2C_Init(I2C1, &I2C_InitStructure);

  /* I2C2 configuration: SMBus Device ----------------------------------------*/
  I2C_InitStructure.I2C_Mode = I2C_Mode_SMBusDevice;
  I2C_InitStructure.I2C_OwnAddress1 = I2C2_SLAVE_ADDRESS7;
  I2C_Init(I2C2, &I2C_InitStructure);

  /* Enable I2C2 ARP */
  I2C_ARPCmd(I2C2, ENABLE);

  /* Enable I2C1 and I2C2 PEC Transmission */
  I2C_CalculatePEC(I2C1, ENABLE);
  I2C_CalculatePEC(I2C2, ENABLE);

  /*----- Transmission Phase -----*/
  /* Send I2C1 START condition */
  I2C_GenerateSTART(I2C1, ENABLE);
  /* Test on I2C1 EV5 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT)); 
  /* Send Slave address */
  I2C_Send7bitAddress(I2C1, SMBusDefaultHeader, I2C_Direction_Transmitter);
  /* Test on I2C1 EV6 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); 

  /* Get I2C2 SMBDEFAULT flag status */
  Status = I2C_GetFlagStatus(I2C2, I2C_FLAG_SMBDEFAULT); 

  /* Send Command */
  I2C_SendData(I2C1, Command);
  /* Clear ADDR flag: read operation to I2C_SR1 register followed by a read 
  operation to I2C_SR2 register */
  (void)(I2C_GetFlagStatus(I2C2, I2C_FLAG_ADDR));
  (void)(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
 
  /* Wait for I2C2 received data */
  while(!I2C_GetFlagStatus(I2C2, I2C_FLAG_RXNE)); 
  /* Store received data on I2C2 */
  ReceivedCommand = I2C_ReceiveData(I2C2);
  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); 

  /* Enable Transfer PEC next for I2C1 and I2C2 */
  I2C_TransmitPEC(I2C1, ENABLE);
  I2C_TransmitPEC(I2C2, ENABLE);
  /* Wait for I2C2 received data */
  while(!I2C_GetFlagStatus(I2C2, I2C_FLAG_RXNE));  
  /* Store received PEC on I2C2 */
  PECValue = I2C_ReceiveData(I2C2);
  /* Test on I2C1 EV8 and clear it */
  while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));

  /* Send I2C1 STOP Condition */
  I2C_GenerateSTOP(I2C1, ENABLE);
  /* Test on I2C2 EV4 and clear it */
  while(!I2C_CheckEvent(I2C2, I2C_EVENT_SLAVE_STOP_DETECTED));
  /* Clear I2C2 STOPF flag: read operation to I2C_SR1 followed by a 
     write operation to I2C_CR1 */
  (void)(I2C_GetFlagStatus(I2C2, I2C_FLAG_STOPF));
  I2C_Cmd(I2C2, ENABLE); 

  while (1)
  {
  }
}

/**
  * @brief  Configures the different system clocks.
  * @param  None
  * @retval : None
  */
void RCC_Configuration(void)
{
  /* Setup the microcontroller system. Initialize the Embedded Flash Interface,  
     initialize the PLL and update the SystemFrequency variable. */
  SystemInit();

/* Enable peripheral clocks --------------------------------------------------*/
  /* GPIOB Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
  /* I2C1 and I2C2 Periph clock enable */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1 | RCC_APB1Periph_I2C2, ENABLE);
}

/**
  * @brief  Configures the different GPIO ports.
  * @param  None
  * @retval : None
  */
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure I2C1 pins: SCL and SDA ----------------------------------------*/
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Configure I2C2 pins: SCL and SDA ----------------------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}

#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

/**
  * @}
  */ 

/**
  * @}
  */ 

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/