182 lines
3.5 KiB
C
182 lines
3.5 KiB
C
#include "iic.h"
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//*****************************************************************/
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//起始信号
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void IIC_Start(void)
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{
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SDA_OUT();
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IIC_SDA(HIGH);
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IIC_SCL(HIGH);
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IIC_Delay();
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IIC_SDA(LOW);
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IIC_Delay();
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IIC_SCL(LOW);
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}
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/*****************************************************************/
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//停止信号
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void IIC_Stop(void)
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{
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SDA_OUT();
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IIC_SCL(LOW);
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IIC_SDA(LOW);
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IIC_Delay();
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IIC_SCL(HIGH);
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IIC_SDA(HIGH);
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IIC_Delay();
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}
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/*****************************************************************/
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//等待答应信号
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//返回值：1，接收应答失败
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// 0，接收应答成功
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uint8_t IIC_Wait_Ack(void)
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{
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uint8_t Time = 0;
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SDA_IN();
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IIC_SDA(HIGH);
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IIC_Delay();
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IIC_SCL(HIGH);
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IIC_Delay();
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while(READ_SDA)
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{
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Time++;
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IIC_Delay();
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if(Time>250)
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{
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SDA_OUT();
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IIC_Stop();
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return 1;
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}
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}
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SDA_OUT();
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IIC_SCL(LOW);
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return 0;
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}
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/***************************************************************/
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//产生答应信号
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void IIC_Ack(void)
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{
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IIC_SCL(LOW);
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SDA_OUT();
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IIC_SDA(LOW);
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IIC_Delay();
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IIC_SCL(HIGH);
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IIC_Delay();
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IIC_SCL(LOW);
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}
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/**************************************************************/
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//不产生答应信号
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void IIC_NAck(void)
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{
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IIC_SCL(LOW);
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SDA_OUT();
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IIC_SDA(HIGH);
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IIC_Delay();
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IIC_SCL(HIGH);
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IIC_Delay();
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IIC_SCL(LOW);
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}
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/*************************************************************/
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//发送一个字节
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void IIC_Send_Byte(uint8_t Txd)
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{
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uint8_t t;
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SDA_OUT();
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IIC_SCL(LOW);
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for(t = 0;t<8;t++)
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{
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IIC_SDA((Txd&0x80)>>7);
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Txd<<=1;
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IIC_SCL(HIGH);
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IIC_Delay();
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IIC_SCL(LOW);
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IIC_Delay();
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}
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}
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/**************************************************************/
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//读取一个字节，ack=1时，发送ACK，ack=0，发送nACK
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uint8_t IIC_Read_Byte(uint8_t Ack)
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{
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uint8_t i,receive = 0;
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SDA_IN();
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for(i = 0;i<8;i++)
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{
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IIC_SCL(LOW);
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IIC_Delay();
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IIC_SCL(HIGH);
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IIC_Delay();
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IIC_Delay();
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receive<<=1;
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if(READ_SDA)
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{
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receive++;
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}
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IIC_Delay();
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}
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SDA_OUT();
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if(!Ack)
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IIC_NAck();
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else
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IIC_Ack();
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return receive;
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}
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/**************************************************************/
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//IIC延时
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void IIC_Delay(void)
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{
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//单周期指令 1/72M=0.01389us
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// co_delay_10us(1);
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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// __NOP();__NOP();__NOP();__NOP();__NOP();
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LL_mDelay(1);
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}
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void SDA_OUT(void)
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{
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LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = LCD_SDA_Pin;
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GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
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GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
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LL_GPIO_Init(LCD_SCL_GPIO_Port, &GPIO_InitStruct);
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}
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void SDA_IN(void)
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{
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LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = LCD_SDA_Pin;
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GPIO_InitStruct.Mode = LL_GPIO_MODE_INPUT;
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GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
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// GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
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LL_GPIO_Init(LCD_SCL_GPIO_Port, &GPIO_InitStruct);
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}
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//初始化IIC
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void IIC_Init(void)
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{
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOB);
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LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
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GPIO_InitStruct.Pin = LCD_SCL_Pin|LCD_SDA_Pin;
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GPIO_InitStruct.Mode = LL_GPIO_MODE_OUTPUT;
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GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
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GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_OPENDRAIN;
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LL_GPIO_Init(LCD_SCL_GPIO_Port, &GPIO_InitStruct);
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}
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