STM32F103RCT6

只看该作者 · 2015-5-6 13:52

你好

我在用STM32 I2C通信的时候发现一个问题，我的STM32是主机，主要是从外部设备读取数据，但是当发送STOP信号后SDA引脚没有上升沿信号，在进行第二次通信的时候就无法通信了。
请问这个问题应该怎样解决呢？下面是我的程序
I2C_GenerateSTART(I2C1, ENABLE);

TIM_Cmd(TIM2, ENABLE);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))          //EV5
{
if(timeout==1)
{
TIM_Cmd(TIM2, DISABLE);
timeout=0;
cnt=0;
LCD_PutString(10,40,"The device is not responsed",White,Magenta);
return;
}
LCD_PutChar(100, 40, 0x30+((StandTime-cnt)&0x0f), Black, Yellow);
}
TIM_Cmd(TIM2, DISABLE);

I2C_Send7bitAddress(I2C1, 0x27<<1, I2C_Direction_Receiver);
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));  //EV6
/*½ÓÊÜ8 BYTEÊý¾Ý*/
LCD_PutString(20,40,"The I2C data is:",Black,Yellow);
for(i=0,col=40;i<2;i++,col+=14)
{
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));       //EV7
I2C_Receive_Data[i] = I2C_ReceiveData(I2C1);
LCD_PutChar(col, 60, 0x30+((I2C_Receive_Data[i]>>4)&0x0f), Black, Yellow);
col+=7;
LCD_PutChar(col, 60, 0x30+(I2C_Receive_Data[i]&0x0f), Black, Yellow);
}

for(i=2,col=82;i<8;i++,col+=14)
{
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));       //EV7
I2C_Receive_Data[i] = I2C_ReceiveData(I2C1);
LCD_PutChar(col, 60, I2C_Receive_Data[i], Black, Yellow);
}

// while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED));       //EV7
I2C_GenerateSTOP(I2C1, ENABLE);

只看该作者 · 2015-5-6 13:54

/********************************************************************
I2C³õÊ¼»¯º¯Êý
********************************************************************/
void I2C_Config(void)
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);       //Ê¹ÄÜI2C1Ê±ÖÓ
/*ÅäÖÃI2C1ºÍI2C2½Ó¿Ú*/
GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);

   /* I2C1 configuration ------------------------------------------------------*/
I2C_Cmd(I2C1, ENABLE);
// I2C_Cmd(I2C2, ENABLE);
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;                //I2C×ÜÏßÄ£Ê½
//  I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;       //¿ìËÙÄ£Ê½ÏÂµÄÕ¼¿Õ±È£¬ÕâÀï²»ÓÃ
//  I2C_InitStructure.I2C_OwnAddress1 = I2C1_SLAVE_ADDRESS7; //ÉèÖÃ×ÔÉí7Î»µØÖ·£¬ÕâÀï×÷ÎªÖ÷»ú£¬²»ÓÃ×ÔÉíµØÖ·
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;                //Ê¹ÄÜÓ¦´ð
//  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; //¶¨ÒåÓ¦´ð7Î»µØÖ·
  I2C_InitStructure.I2C_ClockSpeed = I2CClockSpeed;
  I2C_Init(I2C1, &I2C_InitStructure);

只看该作者 · 2015-5-6 13:56

在发送结束信号后 SDA信号没有上升沿，所以总是在上电后的第二次发送了起始信号后就没有反应。请指教，谢谢！