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用stm32通过i2c读bq34z100-g1电池信息失败

Other Parts Discussed in Thread: BQ34Z100-G1, BQ34110

//IO方向设置
#define SDA_IN() {GPIOH->MODER&=~(3<<(5*2));GPIOH->MODER|=0<<5*2;} //PH5输入模式
#define SDA_OUT() {GPIOH->MODER&=~(3<<(5*2));GPIOH->MODER|=1<<5*2;} //PH5输出模式
//IO操作
#define IIC_SCL PHout(4) //SCL
#define IIC_SDA PHout(5) //SDA
#define READ_SDA PHin(5) //输入SDA

i2c的配置

void IIC_Init(void)
{
GPIO_InitTypeDef GPIO_Initure;

__HAL_RCC_GPIOH_CLK_ENABLE(); 
//PH4,5³õʼ»¯ÉèÖÃ
GPIO_Initure.Pin=GPIO_PIN_4|GPIO_PIN_5;
GPIO_Initure.Mode=GPIO_MODE_OUTPUT_PP; //推挽输出
GPIO_Initure.Pull=GPIO_PULLUP; //上拉
GPIO_Initure.Speed=GPIO_SPEED_HIGH; //快速
HAL_GPIO_Init(GPIOH,&GPIO_Initure);

IIC_SDA=1;
IIC_SCL=1;
}

//产生i2c起始信号
void IIC_Start(void)
{
SDA_OUT(); //sda线输出
IIC_SDA=1;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SDA=0;//START:when CLK is high,DATA change form high to low
delay_us(2);
IIC_SCL=0;//钳住I2C总线,准备发送和接受数据 
delay_us(2);
}
//产生i2c停止信号
void IIC_Stop(void)
{
SDA_OUT();//sda线输出
IIC_SCL=0;
IIC_SDA=0;//STOP:when CLK is high DATA change form low to high
delay_us(4);
IIC_SCL=1;
IIC_SDA=1;//发送II2C总线结束信号
delay_us(4);
}
//等待应答信号到来
//返回值:1,接收应答失败

//             0,接收应答成功

u8 IIC_Wait_Ack(void)
{
u8 ucErrTime=0;
SDA_IN(); //SDA设置为输入
IIC_SDA=1;delay_us(1);
IIC_SCL=1;delay_us(1);
while(READ_SDA)
{
ucErrTime++;
if(ucErrTime>250)
{
IIC_Stop();
return 1;
}
}
IIC_SCL=0;//时钟输出0
return 0;
}
//产生ACK应答
void IIC_Ack(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=0;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//不产省ACK应答 
void IIC_NAck(void)
{
IIC_SCL=0;
SDA_OUT();
IIC_SDA=1;
delay_us(2);
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
}
//IIC发送一个字节
//返回从机有无应答
//1,有应答
//0,无应答 
void IIC_Send_Byte(u8 txd)
{
u8 t;
SDA_OUT();
IIC_SCL=0;//拉低时钟开始传输数据
for(t=0;t<8;t++)
{
IIC_SDA=(txd&0x80)>>7;
txd<<=1;
delay_us(2); 
IIC_SCL=1;
delay_us(2);
IIC_SCL=0;
delay_us(2);
}
}
//读一个字节,ack=1时,发送ACK,ack=0,发送NACK
u8 IIC_Read_Byte(unsigned char ack)
{
unsigned char i,receive=0;
SDA_IN();//SDA设置为输入
for(i=0;i<8;i++ )
{
IIC_SCL=0;
delay_us(2);
IIC_SCL=1;
receive<<=1;
if(READ_SDA)receive++;
delay_us(1);
}
if (!ack)
IIC_NAck();//发送ACK
else
IIC_Ack(); //发送ACK
return receive;
}

uint8_t bq34_data[100]={0};
#define NACK 1
#define ACK 0

uint8_t cmd=0x02;

for(x=0;x<100;x++)
{
IIC_Start();

IIC_Send_Byte(0xaa);
IIC_Wait_Ack();
IIC_Send_Byte(cmd);

delay_us(80);
IIC_Wait_Ack();
IIC_Start();
IIC_Send_Byte(0xab);

IIC_Wait_Ack();
delay_us(100);

bq34_data[x]=IIC_Read_Byte(NACK);
IIC_Send_Byte(NACK);
delay_us(10);
IIC_Stop();
HAL_Delay(100);
printf("%c",bq34_data[x]);
}

接收100次数据,结果没一个数据正确的