WouoUI/Third-party-design/platform-test/User/iic.c

#include "iic.h"
//*****************************************************************/
//<2F><>ʼ<EFBFBD>ź<EFBFBD>
void IIC_Start(void)
{
	SDA_OUT();
	IIC_SDA(HIGH);
	IIC_SCL(HIGH);
	IIC_Delay();
	IIC_SDA(LOW);
	IIC_Delay();
	IIC_SCL(LOW);
}

/*****************************************************************/
//ֹͣ<CDA3>ź<EFBFBD>
void IIC_Stop(void)
{
	SDA_OUT();
	IIC_SCL(LOW);
	IIC_SDA(LOW);
	IIC_Delay();
	IIC_SCL(HIGH);
	IIC_SDA(HIGH);
	IIC_Delay();
}

/*****************************************************************/
//<2F>ȴ<EFBFBD><C8B4><EFBFBD>Ӧ<EFBFBD>ź<EFBFBD>
//<2F><><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>1<EFBFBD><31><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6>ʧ<EFBFBD><CAA7>
//        0<><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD>ɹ<EFBFBD>
uint8_t	IIC_Wait_Ack(void)
{
	uint8_t Time = 0;

	SDA_IN();
	IIC_SDA(HIGH);
	IIC_Delay();
	IIC_SCL(HIGH);
	IIC_Delay();
	while(READ_SDA)
	{
		Time++;
		IIC_Delay();
		if(Time>250)
		{
			SDA_OUT();
			IIC_Stop();
			return 1;
		}
	}
	SDA_OUT();
	IIC_SCL(LOW);
	return 0;
}

/***************************************************************/
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>ź<EFBFBD>
void IIC_Ack(void)
{
	IIC_SCL(LOW);
	SDA_OUT();
	IIC_SDA(LOW);
	IIC_Delay();
	IIC_SCL(HIGH);
	IIC_Delay();
	IIC_SCL(LOW);
}

/**************************************************************/
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<EFBFBD>ź<EFBFBD>
void IIC_NAck(void)
{
	IIC_SCL(LOW);
	SDA_OUT();
	IIC_SDA(HIGH);
	IIC_Delay();
	IIC_SCL(HIGH);
	IIC_Delay();
	IIC_SCL(LOW);
}

/*************************************************************/
//<2F><><EFBFBD><EFBFBD>һ<EFBFBD><D2BB><EFBFBD>ֽ<EFBFBD>
void IIC_Send_Byte(uint8_t Txd)
{
	uint8_t t;
	SDA_OUT();
	IIC_SCL(LOW);
	for(t = 0;t<8;t++)
	{
		IIC_SDA((Txd&0x80)>>7);
		Txd<<=1;
		IIC_SCL(HIGH);
		IIC_Delay();
		IIC_SCL(LOW);
		IIC_Delay();
	}
}

/**************************************************************/
//<2F><>ȡһ<C8A1><D2BB><EFBFBD>ֽڣ<D6BD>ack=1ʱ<31><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ACK<43><4B>ack=0<><30><EFBFBD><EFBFBD><EFBFBD><EFBFBD>nACK
uint8_t IIC_Read_Byte(uint8_t Ack)
{
	uint8_t i,receive = 0;
	SDA_IN();
	for(i = 0;i<8;i++)
	{
		IIC_SCL(LOW);
		IIC_Delay();
		IIC_SCL(HIGH);
		IIC_Delay();
		IIC_Delay();
		receive<<=1;
		if(READ_SDA)
		{
			receive++;
		}
		IIC_Delay();
	}
	SDA_OUT();
	if(!Ack)
		IIC_NAck();
	else
		IIC_Ack();
	return receive;
}

/**************************************************************/
//IIC<49><43>ʱ
void IIC_Delay(void)
{
	//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><D6B8> 1/72M=0.01389us
//	co_delay_10us(1);
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
//	__NOP();__NOP();__NOP();__NOP();__NOP();
	LL_mDelay(1);
}


void SDA_OUT(void)
{
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = LCD_SDA_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
  LL_GPIO_Init(LCD_SCL_GPIO_Port, &GPIO_InitStruct);
}

void SDA_IN(void)
{
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = LCD_SDA_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_INPUT;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
//  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
  LL_GPIO_Init(LCD_SCL_GPIO_Port, &GPIO_InitStruct);
}

//<2F><>ʼ<EFBFBD><CABC>IIC
void IIC_Init(void)
{
  LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);
  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = LCD_SCL_Pin|LCD_SDA_Pin;
  GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
  LL_GPIO_Init(LCD_SCL_GPIO_Port, &GPIO_InitStruct);
}