STM32F103使用模拟IIC读写PCF8563

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feixiang20 回答时间：2017-5-20 22:47:45

#include "PCF8563.h"

#define PCF8563_GPIO       GPIOB
#define PCF8563_SDA             GPIO_Pin_15
#define PCF8563_SCL             GPIO_Pin_14

#define Write_ADD       0xA2       //PCF8563的写地址
#define Read_ADD       0xA3       //PCF8563的读地址

#define PCF8563_Start()                      IIC_Start(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)
#define PCF8563_Send_Byte(n)       IIC_Send_Byte((n), PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)
#define PCF8563_Read_Byte(n)       IIC_Read_Byte((n), PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)
#define PCF8563_Wait_Ack()             IIC_Wait_Ack(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)
#define PCF8563_Stop()                      IIC_Stop(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA)

//************************************
// Method: PCF8563_Init
// FullName:  PCF8563_Init
// Access: public
// Returns: void
// Parameter: void
// Description:       初始化PCF8563的IO口和寄存器
//************************************
void PCF8563_Init(void)
{
      IIC_Init(PCF8563_GPIO, PCF8563_SCL, PCF8563_SDA);
      delay_ms(20);
      PCF8563_Set(CONTROL_STATUS1, 0x00);
      PCF8563_Set(CONTROL_STATUS2, 0x00);
      PCF8563_Set(CLKOUT_CONTROL, 0x81);             //使能CLK输出，1024Hz
}

//************************************
// Method: PCF8563_Read
// FullName:  PCF8563_Read
// Access: public
// Returns: void
// Parameter: PCF8563 * pcf8563
// Description:       读时间年、月、日、时、分
//************************************
void PCF8563_Read(PCF8563 * pcf8563)
{
      PCF8563_Start();
      PCF8563_Send_Byte(Write_ADD);
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(MINUTES);             //分寄存器地址0x03
      PCF8563_Wait_Ack();
      PCF8563_Start();
      PCF8563_Send_Byte(Read_ADD);
      PCF8563_Wait_Ack();
      pcf8563->minutes = PCF8563_Read_Byte(1) & 0X7F;
      pcf8563->hours = PCF8563_Read_Byte(1) & 0X3F;
      pcf8563->days = PCF8563_Read_Byte(1) & 0X3F;
      PCF8563_Read_Byte(1);             //读取星期寄存器，该数据不保存
      pcf8563->months = PCF8563_Read_Byte(1) & 0X1F;
      pcf8563->years = PCF8563_Read_Byte(0);

      PCF8563_Stop();                                     //发送停止信号

      //将时间从BCD编码变成十进制
      pcf8563->minutes = BCDToDec(pcf8563->minutes);
      pcf8563->hours = BCDToDec(pcf8563->hours);
      pcf8563->days = BCDToDec(pcf8563->days);
      pcf8563->months = BCDToDec(pcf8563->months);
      pcf8563->years = BCDToDec(pcf8563->years);
}

//************************************
// Method: PCF8563_Write
// FullName:  PCF8563_Write
// Access: public
// Returns: void
// Parameter: PCF8563 * pcf8563
// Description:       将时间（年、月、日、时、分）写入PCF8563
//************************************
void PCF8563_Write(PCF8563 * pcf8563)
{
      //将时间从十进制变成BCD编码
      pcf8563->minutes = DecToBCD(pcf8563->minutes);
      pcf8563->hours = DecToBCD(pcf8563->hours);
      pcf8563->days = DecToBCD(pcf8563->days);
      pcf8563->months = DecToBCD(pcf8563->months);
      pcf8563->years = DecToBCD(pcf8563->years);

      PCF8563_Start();
      PCF8563_Send_Byte(Write_ADD);
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(MINUTES);             //分寄存器地址0x03
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(pcf8563->minutes);       //发送分
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(pcf8563->hours);       //发送时
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(pcf8563->days);       //发送天
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(0x00);       //发送星期，不关注星期几
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(pcf8563->months);       //发送月
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(pcf8563->years);             //发送年
      PCF8563_Wait_Ack();
      PCF8563_Stop();                                     //发送停止信号
}

//************************************
// Method: PCF8563_Set
// FullName:  PCF8563_Set
// Access: public
// Returns: void
// Parameter: PCF8563_REGISTER regaddr
// Parameter: unsigned char _data
// Description:       设置寄存器的值
//************************************
void PCF8563_Set(PCF8563_REGISTER regaddr, unsigned char _data)
{
      PCF8563_Start();
      PCF8563_Send_Byte(Write_ADD);
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(regaddr);
      PCF8563_Wait_Ack();
      PCF8563_Send_Byte(_data);
      PCF8563_Wait_Ack();
      PCF8563_Stop();
}

//************************************
// Method: DecToBCD
// FullName:  DecToBCD
// Access: public
// Returns: unsigned char
// Parameter: unsigned char _dec
// Description:       十进制转BCD编码
//************************************
unsigned char DecToBCD(unsigned char _dec)
{
      unsigned char temp = 0;
      while (_dec >= 10)
      {
            temp++;
            _dec -= 10;
      }
      return ((unsigned char)(temp << 4) | _dec);
}

//************************************
// Method: BCDToDec
// FullName:  BCDToDec
// Access: public
// Returns: unsigned char
// Parameter: unsigned char _BCD
// Description:       BCD编码转十进制
//************************************
unsigned char BCDToDec(unsigned char _BCD)
{
      unsigned char temp = 0;

      temp = ((unsigned char)(_BCD & (unsigned char)0xF0) >> (unsigned char)0x04) * 10;
      return (temp + (_BCD & (unsigned char)0x0F));
}
复制代码
#include "IIC.h"

//#define SDA_H()       SET_BIT(GPIO->BSRR,SDA_Pin)
//#define SDA_L()       SET_BIT(GPIO->BRR,SDA_Pin)
//#define SCL_H()       SET_BIT(GPIO->BSRR,SCL_Pin)
//#define SCL_L()       SET_BIT(GPIO->BRR,SCL_Pin)
#define SDA_H()       (GPIO->BSRR|=SDA_Pin)
#define SDA_L()       (GPIO->BRR|=SDA_Pin)
#define SCL_H()       (GPIO->BSRR|=SCL_Pin)
#define SCL_L()       (GPIO->BRR|=SCL_Pin)

//************************************
// Method: IIC_Init
// FullName:  IIC_Init
// Access: public
// Returns: void
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       初始化IIC，设置SDA、SCL为开漏输出，初始为高电平
//************************************
void IIC_Init(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);       //本次应用中，两个IIC器件均在GPIOB上

      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;             //开漏输出
      GPIO_InitStructure.GPIO_Pin = SCL_Pin | SDA_Pin;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
      GPIO_Init(GPIO, &GPIO_InitStructure);

      //GPIO->BSRR |= SDA_Pin;
      //GPIO->BRR |= SCL_Pin;
      GPIO_SetBits(GPIO, SDA_Pin | SCL_Pin);       //SDA、SCL初始状态为高电平
}

//************************************
// Method: IIC_Start
// FullName:  IIC_Start
// Access: public
// Returns: void
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       产生起始信号，SCL为高电平时，SDA下降沿
//************************************
void IIC_Start(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      SDA_H();
      SCL_H();
      delay_us(4);
      SDA_L();       //开始信号
      delay_us(4);
      SCL_L();       //拉低SCL电平，准备发送或接收数据
}

//************************************
// Method: IIC_Stop
// FullName:  IIC_Stop
// Access: public
// Returns: void
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       产生停止信号，SCL为高电平时，SDA上升沿
//************************************
void IIC_Stop(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      SCL_L();
      SDA_L();
      delay_us(4);
      SCL_H();
      SDA_H();
      delay_us(4);
}

//************************************
// Method: IIC_Send_Byte
// FullName:  IIC_Send_Byte
// Access: public
// Returns: void
// Parameter: u8 txd
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       IIC发送一个字节
//************************************
void IIC_Send_Byte(u8 txd, GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      u8 t;
      SCL_L();       //拉低时钟开始数据传输
      for (t=0;t<8;t++)
      {
            GPIO_WriteBit(GPIO, SDA_Pin, (BitAction)((txd & 0x80) >> 7));
            txd <<= 1;
            delay_us(2);
            SCL_H();
            delay_us(2);
            SCL_L();
            delay_us(2);
      }
}

//************************************
// Method: IIC_Read_Byte
// FullName:  IIC_Read_Byte
// Access: public
// Returns: u8
// Parameter: unsigned char ack
//                               ack=1，发送ACK
//                               ack=0，发送NACK
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       读一个字节，SCL低电平时，改变SDA
//************************************
u8 IIC_Read_Byte(unsigned char ack, GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      unsigned char i, receive = 0;
      SDA_H();       //释放总线
      for (i = 0; i < 8; i++)
      {
            SCL_L();
            delay_us(2);
            SCL_H();
            receive <<= 1;
            if (GPIO_ReadInputDataBit(GPIO, SDA_Pin))
            {
                     receive++;
            }
            //receive |= READ_BIT(GPIO->IDR, SDA_Pin);
            delay_us(1);
      }
      if (!ack)
            IIC_NAck(GPIO, SCL_Pin, SDA_Pin);//发送nACK
      else
            IIC_Ack(GPIO, SCL_Pin, SDA_Pin); //发送ACK
      return receive;
}

//************************************
// Method: IIC_Wait_Ack
// FullName:  IIC_Wait_Ack
// Access: public
// Returns: u8       1-接收应答失败，0-接收应答成功
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       等待应答信号到来
//************************************
u8 IIC_Wait_Ack(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      u8 ucErrTime = 0;
      SDA_H();             //释放总线
      delay_us(1);
      SCL_H();
      delay_us(1);

      while (READ_BIT(GPIO->IDR,SDA_Pin))
      {
            ucErrTime++;
            if (ucErrTime > 250)
            {
                     IIC_Stop(GPIO, SCL_Pin, SDA_Pin);
                     return 1;
            }
      }
      SCL_L();
      return 0;
}

//************************************
// Method: IIC_Ack
// FullName:  IIC_Ack
// Access: public
// Returns: void
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       产生ACK应答，设备在接收或发送到一个字节后能拉低SDA电平
//************************************
void IIC_Ack(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      SCL_L();
      SDA_L();
      delay_us(2);
      SCL_H();
      delay_us(2);
      SCL_L();
}

//************************************
// Method: IIC_NAck
// FullName:  IIC_NAck
// Access: public
// Returns: void
// Parameter: GPIO_TypeDef * GPIO
// Parameter: uint16_t SCL_Pin
// Parameter: uint16_t SDA_Pin
// Description:       产生NACK应答，设备在接收或发送到一个字节后能拉低SDA电平
//************************************
void IIC_NAck(GPIO_TypeDef * GPIO, uint16_t SCL_Pin, uint16_t SDA_Pin)
{
      SCL_L();
      SDA_H();
      delay_us(2);
      SCL_H();
      delay_us(2);
      SCL_L();
}

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