STM32F4 I2C3做slave中断后systick不能进中断

CCXX

使用STM32F401的I2C3做smbus slave，I2C3不接host的时候一切正常。当I2C host以100KHz每500ms发一包数据，slave接收中断后导致操作系统不能调度，debug发现是systick不能进中断了，我试过把I2C3的优先级调到最低也是这样。i2c3使用PA8和PB4，初始化和中断函数如下，麻烦大家帮忙分一下，谢谢。

1. void pcie_smbus_init(void)
   
2. {
   
3.     RCC->AHB1ENR |= 0xff;
   
4.     GPIOA->MODER &= ~(0x3 << (8 * 2));
   
5.     GPIOA->MODER |=  (0x2 << (8 * 2));
   
6.     GPIOA->OTYPER |=  1 << 8;
   
7.     GPIOA->PUPDR &= ~(0x3 << (8 * 2));
   
8.     GPIOA->PUPDR |=  (0x1 << (8 * 2));
   
9.     GPIOA->AFR[1] = 4;
   
10. 
    
11.     GPIOB->MODER &= ~(0x3 << (4 * 2));
    
12.     GPIOB->MODER |=  (0x2 << (4 * 2));
    
13.     GPIOB->OTYPER |=  1 << 4;
    
14.     GPIOB->PUPDR &= ~(0x3 << (4 * 2));
    
15.     GPIOB->PUPDR |=  (0x1 << (4 * 2));
    
16.     GPIOB->AFR[0] = 9 << (4 * 4);
    
17. 
    
18.     RCC->APB1ENR |= 1 << 23;
    
19.     I2C3->CR1 = 0;
    
20.     I2C3->CR2 |= 1 << 10;
    
21.     I2C3->CR2 |= 1 << 9;
    
22.     I2C3->CR2 |= 1 << 8;
    
23.     I2C3->CR2 |= 42;
    
24. 
    
25.     I2C3->OAR1 = 0xa0;
    
26.     I2C3->OAR2 = 0x50 | 0x01;
    
27.     I2C3->SR1 = 0;
    
28.     I2C3->SR2 = 0;
    
29.     I2C3->CCR = 210;
    
30.     I2C3->TRISE = 0x2b;
    
31. 
    
32.     I2C3->CR1 |= 1 << 1;
    
33.     I2C3->CR1 |= 1 << 0;
    
34.     I2C3->CR1 |= 1 << 10;
    
35. 
    
36.     NVIC->IP[I2C3_EV_IRQn] = 0 << 4;
    
37.     NVIC->ISER[I2C3_EV_IRQn / 32] |= (1 << (I2C3_EV_IRQn % 32));
    
38.     NVIC->IP[I2C3_ER_IRQn] = 0 << 4;
    
39.     NVIC->ISER[I2C3_ER_IRQn / 32] |= (1 << (I2C3_ER_IRQn % 32));
    
40. }

复制代码

1. unsigned char g_smbus_buffer[256] = {0};
   
2. unsigned int g_count = 0;
   
3. void I2C3_EV_IRQHandler(void)
   
4. {
   
5.     volatile unsigned short sr1 = 0;
   
6.     volatile unsigned short sr2 = 0;
   
7. 
   
8.     sr1 = I2C3->SR1;
   
9.     sr2 = I2C3->SR2;
   
10. 
    
11.     if((sr2 & 0x0005) == 0x0000)
    
12.     {
    
13.         if((sr1 & (1 << 0)) == (1 << 0))//start
    
14.         {
    
15.         }
    
16.         if((sr1 & (1 << 1)) == (1 << 1))//addr matched
    
17.         {
    
18.             g_count = 0;
    
19.             memset(g_smbus_buffer, 0, sizeof(g_smbus_buffer));
    
20.         }
    
21.         if((sr1 & (1 << 2)) == (1 << 2))//byte finished
    
22.         {
    
23.         }
    
24.         if((sr1 & (1 << 4)) == (1 << 4))//stop
    
25.         {
    
26.         }
    
27.         if((sr1 & (1 << 6)) == (1 << 6))//recv data
    
28.         {
    
29.             g_smbus_buffer[g_count++] = I2C3->DR;
    
30.         }
    
31.     }
    
32. }
    
33. 
    
34. void I2C3_ER_IRQHandler(void)
    
35. {
    
36.     volatile unsigned short sr1 = 0;
    
37.     sr1 = I2C3->SR1;
    
38. 
    
39.     if((sr1 & (1 << 11)) == (1 << 11))//OVR
    
40.     {
    
41.         I2C3->CR1 &= ~(1 << 11);
    
42.     }
    
43.     if((sr1 & (1 << 10)) == (1 << 10))//AF
    
44.     {
    
45.         I2C3->CR1 &= ~(1 << 10);
    
46.     }
    
47.     if((sr1 & (1 << 9)) == (1 << 9))//ARLO
    
48.     {
    
49.         I2C3->CR1 &= ~(1 << 9);
    
50.     }
    
51.     if((sr1 & (1 << 8)) == (1 << 8))//BERR
    
52.     {
    
53.         I2C3->CR1 &= ~(1 << 8);
    
54.     }
    
55. }

复制代码

CCXX

虽然进不了systicck中断，但是 i2c3接收数据是正常的，systick看起来也正常

Tlava

帮顶   

lpwithv

没用过32的硬件i2c，之前听说有问题不敢用

八度空间

F3和F0的硬件iic主和从设备模式都是可以，速度100K