I2C驱动AT24C02

一、硬件电路

设备地址

二、使用步骤

static int ATC02I2CWrite(uint8_t *pdata,uint16_t length){
	HAL_StatusTypeDef status =  HAL_I2C_Master_Transmit(&hi2c1, (0x50<<1), pdata, length, 0xFF);
	if(status != ESUCCESS){
		return -EIO;
		}

	return ESUCCESS;
}

static int ATC02I2CRead(uint8_t *pdata,uint16_t length){
	HAL_StatusTypeDef status =  HAL_I2C_Master_Receive(&hi2c1, (0x50<<1), pdata, length, 0xFF);
	if(status != ESUCCESS){
		return -EIO;
	}

	return ESUCCESS;
}

字节写:

static int ByteWrite(uint8_t addr,uint8_t pdata){
	uint8_t data[2] = {addr,pdata};
	int ret = ATC02I2CWrite(data,2);
	if(ret != ESUCCESS){
		return -EIO;
	}

	osDelay(5);
	return ESUCCESS;
}

页写入:

static int PageWrite(uint8_t addr,uint8_t *pdata,uint8_t length){
	uint8_t data[9] = {addr};
	memcpy(&data[1],pdata,length);
	int ret = ATC02I2CWrite(data,length+1);
	if(ret != ESUCCESS){
		return -EIO;
	}
	return ESUCCESS;
}

任意写:

static int ATC02Write(uint8_t addr,uint8_t *pdata,uint16_t length){
	uint8_t pages = (length + addr%ATC02_PAGE_SIZE)/ATC02_PAGE_SIZE+1;

	int ret = 0;
	if(pages == 1){
		ret = PageWrite(addr,pdata,length);
		if(ret != ESUCCESS){
		return -EIO;
	}
	}else{
		uint8_t firstWriteByte = ATC02_PAGE_SIZE - addr%ATC02_PAGE_SIZE;
		if(firstWriteByte != 0){
			ret = PageWrite(addr,pdata,firstWriteByte);
			if(ret != ESUCCESS){
				return -EIO;
			}

			addr = addr + firstWriteByte;
			pdata = pdata + firstWriteByte;
			length = length - firstWriteByte;
		}

		uint8_t length1 = 0;
		while(length){

			if(length > ATC02_PAGE_SIZE){
				length1 = 8;
			}else{
				length1 = length;
			}

			ret = PageWrite(addr,pdata,length1);
			if(ret != ESUCCESS){
				return -EIO;
			}

			addr = addr + length1;
			pdata = pdata + length1;
			length = length - length1;

		}
	
	}

	return ESUCCESS;
}

任意读:

static int ATC02Read(uint8_t addr,uint8_t *pdata,uint16_t length){
	int ret = ATC02I2CWrite(&addr,1);
	if(ret != ESUCCESS){
		return -EIO;
	}

	ret = ATC02I2CRead(pdata,length);
	if(ret != ESUCCESS){
		return -EIO;
	}
	return ESUCCESS;
}