使用硬件的I2C感觉要比模拟的好用，速度还快。使用64MHz的HSI,
// IIC_add=IIC_24C02_ADD; //器件地址
void I2C1_INIT(void)
{
RCC_CR |= 1; //HSION
RCC_D2CCIP2R |=Bit1_13; // HSI->I2C 64MHz
RCC_APB1LENR |= Bit1_21; //I2C1EN
__NOP();
RCC_APB1LRSTR |= Bit1_21; //RST
__NOP();
RCC_APB1LRSTR &= Bit0_21;
RCC_AHB4ENR |= Bit1_1; //GPIOB
GPIOB_MODER &=0xFFFF0FFF;
GPIOB_MODER |=0x0000A000;
GPIOB_OTYPER |=Bit1_7 ;
GPIOB_OSPEEDR |= 0x0000F000;
GPIOB_PUPDR &=0xFFFF0FFF;
GPIOB_PUPDR |=0x00005000; //上拉
GPIOB_AFRL |=0x44000000; //AF4 I2C
IIC_add=IIC_SD3078_ADD; //器件地址
I2C1_CR1 = 0;
I2C1_TIMINGR = 0x00602173; //速率 100KHz=0x10707DBC / 400KHz=0x00602173 / 1MHz=0x00300B29
I2C1_TIMOUTR =0x00;
I2C1_CR2 = 0;
I2C1_ICR = 0x3F38; //清ISR
I2C1_OAR1 = 0;
I2C1_OAR2 = 0;
}
HAL_StatusTypeDef I2C_tx(uint8_t iic_ad, uint8_t *IIC_p, uint8_t IIC_n) //起始地址 + RAM地址+ 数量
{
uint32_t Regset;
I2C1->ICR = 0x3F38; //清ISR
I2C1->CR1 = 1;
Regset=IIC_n+1; //add+data
Regset<<=16; //NBYTES
Regset|=Bit1_25; //AutoEnd
//Regset &=Bit0_12; //7addres
//Regset &=Bit0_11; //7addres
Regset &= Bit0_10; //W0 R1
Regset |= IIC_add; //起始地址
I2C1->CR2 = Regset;
I2C1->CR2 |=Bit1_13; //START
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
Regset=0x0000FFFF;
while((I2C1->CR2 &Bit1_13)==Bit1_13)
{ //等待发送起始地址START=0
Regset--;
if(Regset==0) return HAL_ERROR;
}
I2C1->TXDR=iic_ad;
while(IIC_n--)
{
Regset=0x0000FFFF;
while((I2C1->ISR&1)==0)
{
Regset--;
if(Regset==0) return HAL_ERROR;
}
I2C1->TXDR=*(IIC_p++);
}
Regset=0x0000FFFF;
while((I2C1->ISR&1)==0)
{ //发送最后数据
Regset--;
if(Regset==0) return HAL_ERROR;
}
I2C1->CR2 |= Bit1_14; //STOP
Regset=0x0000FFFF;
while((I2C1->ISR&Bit1_15)==Bit1_15)
{ //等待结束
Regset--;
if(Regset==0) return HAL_ERROR;
}
I2C1->CR1 = 0;
return HAL_OK;
}
HAL_StatusTypeDef I2C_rx(uint8_t iic_ad, uint8_t *IIC_p,uint8_t IIC_n)
{
uint32_t Regset;
if(I2C_tx(iic_ad, IIC_p, 1)!=HAL_OK ) return HAL_ERROR ;
//IIC_add = IIC_SD3078_ADD;
//I2C1->CR1 = 0;
I2C1->ICR = 0x3F38; //清ISR
I2C1->CR1 = 1;
I2C1->CR2 = 0;
Regset=IIC_n;
Regset<<=16; //NBYTES
Regset|=Bit1_25; //AutoEnd
//Regset &=Bit0_12; //7addres
//Regset &=Bit0_11; //7addres
Regset |= Bit1_10; //R1
Regset |= IIC_add; //从地址
I2C1->CR2 = Regset;
I2C1->CR2 |=Bit1_13; //START
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
Regset=0x0000FFFF;
while((I2C1->CR2 &Bit1_13)==Bit1_13)
{ //等待发送从地址 START=0
Regset--;
if(Regset==0) return HAL_ERROR;
}
while(IIC_n--)
{
Regset=0x0000FFFF;
while((I2C1->ISR&Bit1_2)==0)
{ //接收为空
Regset--;
if(Regset==0) return HAL_ERROR;
}
*(IIC_p++)=I2C1->RXDR;
}
I2C1->CR2 |= Bit1_14; //STOP
Regset=0x0000FFFF;
while((I2C1->ISR&Bit1_15)==Bit1_15)
{ //等待结束
Regset--;
if(Regset==0) return HAL_ERROR;
}
I2C1->CR1 = 0;
return HAL_OK;
}
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