I2C_IIC STM32 中断

stm32 I2c 死循环

发布于 2023-12-22 10:39:23 浏览：1170 订阅该版

求助，i2c硬件驱动程序不稳定，不知道该怎么解决了！
最近增加了i2c硬件中断的驱动程序，用200KHZ以下跑没问题，但是设置到400KHZ后，开机一段时间程序会卡在如下中断中持续触发，中断无法关闭：

```c
void I2C1_EV_IRQHandler(void)
{
    rt_interrupt_enter();

HAL_I2C_EV_IRQHandler(&hard_i2c_bus_obj[0].handle);

rt_interrupt_leave();
}
```

如下图片是400KH还未死循环时的波形

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231222/fba8150a78bf01916c74f7c49b09d190.png.webp)

如下图片时400KHZ死循环瞬间的波形

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231222/1c245b907615a3e7cc993c3cc01bedad.png)

如下是I2C句柄进入HAL_I2C_EV_IRQHandler库函数后内部的变量值

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231222/7b0baf4f37b26631598f6f7445a2888b.png.webp)

I2C的SR1寄存器值为0x80,按照参考手册解释如下

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20231222/84038bfaf2633133775db33ae81e936e.png.webp)
在HAL_I2C_EV_IRQHandler库函数内部进入I2C_MasterTransmit_BTF(hi2c)

```c
/* BTF set -------------------------------------------------------------*/
        else if ((I2C_CHECK_FLAG(sr1itflags, I2C_FLAG_BTF) != RESET) && (I2C_CHECK_IT_SOURCE(itsources, I2C_IT_EVT) != RESET))
        {
          I2C_MasterTransmit_BTF(hi2c);
        }
```

但是进入I2C_MasterTransmit_BTF内部后，if (hi2c->State == HAL_I2C_STATE_BUSY_TX)判断不成立，直接跳出，导致中断无限循环卡死（实际我现在是HAL_I2C_STATE_BUSY_RX，因为是读i2c的寄存器）

```c
static void I2C_MasterTransmit_BTF(I2C_HandleTypeDef *hi2c)
{
  /* Declaration of temporary variables to prevent undefined behavior of volatile usage */
  uint32_t CurrentXferOptions = hi2c->XferOptions;

if (hi2c->State == HAL_I2C_STATE_BUSY_TX)
  {
    if (hi2c->XferCount != 0U)
    {
      /* Write data to DR */
      hi2c->Instance->DR = *hi2c->pBuffPtr;

/* Increment Buffer pointer */
      hi2c->pBuffPtr++;

/* Update counter */
      hi2c->XferCount--;
    }
    else
    {
      /* Call TxCpltCallback() directly if no stop mode is set */
      if ((CurrentXferOptions != I2C_FIRST_AND_LAST_FRAME) && (CurrentXferOptions != I2C_LAST_FRAME) && (CurrentXferOptions != I2C_NO_OPTION_FRAME))
      {
        __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR);

hi2c->PreviousState = I2C_STATE_MASTER_BUSY_TX;
        hi2c->Mode = HAL_I2C_MODE_NONE;
        hi2c->State = HAL_I2C_STATE_READY;

#if (USE_HAL_I2C_REGISTER_CALLBACKS == 1)
        hi2c->MasterTxCpltCallback(hi2c);
#else
        HAL_I2C_MasterTxCpltCallback(hi2c);
#endif /* USE_HAL_I2C_REGISTER_CALLBACKS */
      }
      else /* Generate Stop condition then Call TxCpltCallback() */
      {
        /* Disable EVT, BUF and ERR interrupt */
        __HAL_I2C_DISABLE_IT(hi2c, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR);

/* Generate Stop */
        SET_BIT(hi2c->Instance->CR1, I2C_CR1_STOP);

hi2c->PreviousState = I2C_STATE_NONE;
        hi2c->State = HAL_I2C_STATE_READY;

if (hi2c->Mode == HAL_I2C_MODE_MEM)
        {
          hi2c->Mode = HAL_I2C_MODE_NONE;
#if (USE_HAL_I2C_REGISTER_CALLBACKS == 1)
          hi2c->MemTxCpltCallback(hi2c);
#else
          HAL_I2C_MemTxCpltCallback(hi2c);
#endif /* USE_HAL_I2C_REGISTER_CALLBACKS */
        }
        else
        {
          hi2c->Mode = HAL_I2C_MODE_NONE;

#if (USE_HAL_I2C_REGISTER_CALLBACKS == 1)
          hi2c->MasterTxCpltCallback(hi2c);
#else
          HAL_I2C_MasterTxCpltCallback(hi2c);
#endif /* USE_HAL_I2C_REGISTER_CALLBACKS */
        }
      }
    }
  }
}
```
贴出我写的硬件I2c的驱动程序原代码如下：

```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-12-17     zzzyy       the first version
 */

#include <board.h>
#include "drv_hard_i2c.h"
#include "drv_config.h"
#include<rtthread.h>
#include<rtdevice.h>

#ifdef BSP_USING_HARD_I2C

//#define DRV_DEBUG
#define LOG_TAG              "drv.hwi2c"
#include <drv_log.h>

#if !defined(BSP_USING_HARD_I2C1) && !defined(BSP_USING_HARD_I2C2) && !defined(BSP_USING_HARD_I2C3) && !defined(BSP_USING_HARD_I2C4)
#error "Please define at least one BSP_USING_I2Cx"
#endif

/* stm32 config class */
struct stm32_hard_i2c_config
{
    I2C_TypeDef *Instance;              /* i2c bus name */
    const char *bus_name;               /* i2c bus name */
    rt_uint8_t scl;
    rt_uint8_t sda;
};

static struct stm32_hard_i2c_config hard_i2c_config[] =
{
#ifdef BSP_USING_HARD_I2C1
    HARD_I2C_CONFIG(1),
#endif
#ifdef BSP_USING_HARD_I2C2
    HARD_I2C_CONFIG(2),
#endif
#ifdef BSP_USING_HARD_I2C3
    HARD_I2C_CONFIG(3),
#endif
#ifdef BSP_USING_HARD_I2C4
    HARD_I2C_CONFIG(4),
#endif
};

/* stm32 i2c dirver class */
typedef rt_err_t (*configure)(struct rt_i2c_bus_device *device, struct rt_i2c_configuration configuration);
struct stm32_i2c
{
    I2C_HandleTypeDef handle;           /* i2c handle */
    const struct stm32_hard_i2c_config *config;
    struct rt_i2c_configuration cfg;
    struct rt_i2c_bus_device i2c_bus;
    configure configure;
    rt_sem_t tx_notice;                 /*发送完成信号量*/
    rt_sem_t rx_notice;                 /*接收完成信号量*/
    rt_uint8_t bus_busy_flag;        /*总线忙标志*/
};

static struct stm32_i2c hard_i2c_bus_obj[sizeof(hard_i2c_config) / sizeof(hard_i2c_config[0])] = {0};

static rt_err_t stm32_hard_i2c_init(struct stm32_i2c *i2c_drv)
{
    RT_ASSERT(i2c_drv != RT_NULL);
    I2C_HandleTypeDef *i2c_handle = &i2c_drv->handle;
    struct rt_i2c_configuration *cfg = &i2c_drv->cfg;

i2c_handle->Init.ClockSpeed = cfg->speed ;
    if (cfg->speed > RT_I2C_SPEED_400KHZ)
    {
        i2c_handle->Init.ClockSpeed = RT_I2C_SPEED_400KHZ;
    }
    i2c_handle->Init.DutyCycle = I2C_DUTYCYCLE_2;
    i2c_handle->Init.OwnAddress1 = 0;
    i2c_handle->Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    i2c_handle->Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
    i2c_handle->Init.OwnAddress2 = 0;
    i2c_handle->Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
    i2c_handle->Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;

LOG_D("sys freq: %d, i2c freq: %d",
          HAL_RCC_GetSysClockFreq(),
          i2c_handle->Init.ClockSpeed);

if (HAL_I2C_Init(i2c_handle) != HAL_OK)
    {
        return RT_EIO;
    }

LOG_D("%s init done", i2c_drv->config->bus_name);
    return RT_EOK;
}

static rt_err_t hard_i2c_configure(struct rt_i2c_bus_device *device,
                              struct rt_i2c_configuration configuration)
{
    RT_ASSERT(device != RT_NULL);

struct stm32_i2c *i2c_drv =  rt_container_of(device, struct stm32_i2c, i2c_bus);
    i2c_drv->cfg = configuration;
    return stm32_hard_i2c_init(i2c_drv);
}

/**
 * if i2c is locked, this function will unlock it
 *
 * @param stm32 config class
 *
 * @return RT_EOK indicates successful unlock.
 */
static rt_err_t stm32_i2c_bus_unlock(struct stm32_i2c *i2c_drv)
{
    rt_int32_t i = 0;
    rt_err_t ret = RT_EOK;

I2C_HandleTypeDef *handle = &i2c_drv->handle;
    const struct stm32_hard_i2c_config *config = i2c_drv->config;

//    rt_enter_critical();

if (PIN_HIGH == rt_pin_read(config->sda))
    {
        goto __exit;
    }

rt_pin_mode(config->scl, PIN_MODE_OUTPUT_OD);
    rt_pin_mode(config->sda, PIN_MODE_OUTPUT_OD);

rt_pin_write(config->sda, PIN_HIGH);

/*发送9次clk*/
    while (i++ < 9)
    {
        rt_pin_write(config->scl, PIN_HIGH);
        rt_hw_us_delay(20);
        rt_pin_write(config->scl, PIN_LOW);
        rt_hw_us_delay(20);
    }

if (PIN_LOW == rt_pin_read(config->sda))
    {
        ret = -RT_EIO;
    }
    else
    {
        /*成功检测到ACK,发送停止*/
        rt_pin_write(config->sda, PIN_LOW);
        rt_hw_us_delay(1);
        rt_pin_write(config->scl, PIN_HIGH);
        rt_hw_us_delay(10);
        rt_pin_write(config->sda, PIN_HIGH);
    }

/*硬件初始化*/

__exit:
    HAL_I2C_MspInit(handle);

//    rt_exit_critical();
    return ret;
}

static rt_err_t stm32_i2c_rst_busy(struct rt_i2c_bus_device *bus)
{
    rt_err_t ret = RT_EOK;

struct stm32_i2c *i2c_drv =  rt_container_of(bus, struct stm32_i2c, i2c_bus);
    I2C_HandleTypeDef *handle = &i2c_drv->handle;

rt_enter_critical();

/*有问题，没弄明白原因*/
    /* Disable EVT and ERR interrupt */
//    __HAL_I2C_DISABLE_IT(handle, I2C_IT_EVT | I2C_IT_BUF | I2C_IT_ERR);
//    HAL_I2C_DeInit(handle);
    /*禁用i2c*/
    __HAL_I2C_DISABLE(handle);

if (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY) != RESET)
    {
        i2c_drv->bus_busy_flag = 1;

ret = stm32_i2c_bus_unlock(i2c_drv);

if (ret != RT_EOK)
        {
            goto __exit;
        }

}

/*复位控制器*/
    handle->Instance->CR1 |= I2C_CR1_SWRST;
    handle->Instance->CR1 &= ~I2C_CR1_SWRST;

if (__HAL_I2C_GET_FLAG(handle, I2C_FLAG_BUSY) != RESET)
    {
        ret = -RT_EIO;
        goto __exit;
    }
    i2c_drv->bus_busy_flag = 0;

__exit:
    /*软复位i2c控制器后，必须重新初始化*/
    HAL_I2C_Init(handle);
    rt_exit_critical();
   return ret;
}

static rt_size_t i2c_hard_xfer(struct rt_i2c_bus_device *bus,
                              struct rt_i2c_msg         msgs[],
                              rt_uint32_t               num)
{
    struct rt_i2c_msg *msg;
    struct stm32_i2c *i2c_drv =  rt_container_of(bus, struct stm32_i2c, i2c_bus);
    I2C_HandleTypeDef *handle = &i2c_drv->handle;
    rt_int32_t ret;
    HAL_StatusTypeDef hal_status;
    rt_uint8_t rst_flag = 0;

if (num == 0) return 0;

if (i2c_drv->bus_busy_flag)
    {
__i2c_start:
        ret = stm32_i2c_rst_busy(bus);
        if (ret != RT_EOK)
        {
            goto __exit;
        }
        rst_flag = 1;
    }
    if (num == 1)
    {
        msg = &msgs[0];
        if (msg->flags & RT_I2C_RD)
        {
            hal_status = HAL_I2C_Master_Receive_IT(handle, (msg->addr << 1), msg->buf, msg->len);
            if (hal_status != HAL_OK)
            {
                if (rst_flag)
                {
                    ret = -hal_status;
                    goto __exit;
                }
                /*复位重试*/
                goto __i2c_start;

}

ret = rt_sem_take(i2c_drv->rx_notice, (10 * msg->len));
            if (ret != RT_EOK)
            {
                HAL_I2C_Master_Abort_IT(handle, msg->addr << 1);
                goto __exit;
            }
        }
        else
        {
            hal_status = HAL_I2C_Master_Transmit_IT(handle, msg->addr << 1, msg->buf, msg->len);

if (hal_status != HAL_OK)
            {
                if (rst_flag)
                {
                    ret = -hal_status;
                    goto __exit;
                }
                /*复位重试*/
                goto __i2c_start;

}
            ret = rt_sem_take(i2c_drv->tx_notice, (10 * msg->len));
            if (ret != RT_EOK)
            {
                HAL_I2C_Master_Abort_IT(handle, msg->addr << 1);
                goto __exit;
            }
        }
        ret = 1;
    }
    else if (num == 2)
    {
        msg = &msgs[0];
        if (((msgs[0].flags & RT_I2C_WR) == RT_I2C_WR) &&((msgs[1].flags & RT_I2C_RD) == RT_I2C_RD))
        {
            hal_status = HAL_I2C_Mem_Read_IT(handle, (msg->addr << 1), *(msg->buf), I2C_MEMADD_SIZE_8BIT, msg[1].buf,
                    msg[1].len);

if (hal_status != HAL_OK)
            {
                if (rst_flag)
                {
                    ret = -hal_status;
                    goto __exit;
                }
                /*复位重试*/
                goto __i2c_start;

}

ret = rt_sem_take(i2c_drv->rx_notice, (10 * msg->len));
            if (ret != RT_EOK)
            {
                ;
                goto __exit;
            }
        }
        else
        {
            hal_status = HAL_I2C_Mem_Write_IT(handle, msg->addr << 1, *(msg->buf), I2C_MEMADD_SIZE_8BIT, msg[1].buf,
                    msg[1].len);

if (hal_status != HAL_OK)
            {
                if (rst_flag)
                {
                    ret = -hal_status;
                    goto __exit;
                }
                /*复位重试*/
                goto __i2c_start;

}

ret = rt_sem_take(i2c_drv->tx_notice, (10 * msg->len));
            if (ret != RT_EOK)
            {
                ;
                goto __exit;
            }
        }

ret = 2;
    }
    else
    {
        ret = -RT_EINVAL;
    }

return ret;

__exit:
    return ret;
}

static const struct rt_i2c_bus_device_ops i2c_hard_bus_ops =
{
        .master_xfer = i2c_hard_xfer,
        .slave_xfer = RT_NULL,
        .i2c_bus_control = RT_NULL,
};

static int rt_hw_i2c_bus_init(void)
{
    rt_err_t ret = RT_EOK;
    char str[RT_NAME_MAX*2] = "";
    struct rt_i2c_configuration config ={0};

for (int i = 0; i < sizeof(hard_i2c_config) / sizeof(hard_i2c_config[0]); i++)
    {
        hard_i2c_bus_obj[i].config = &hard_i2c_config[i];
        hard_i2c_bus_obj[i].handle.Instance = hard_i2c_config[i].Instance;
        hard_i2c_bus_obj[i].i2c_bus.ops = &i2c_hard_bus_ops;
        hard_i2c_bus_obj[i].configure = hard_i2c_configure;
        if (i==0)
        {
#ifdef BSP_HARD_I2C1_SPEED
            config.speed = BSP_HARD_I2C1_SPEED;
#else
            config.speed = RT_I2C_SPEED_100KHZ;
#endif
        }
        else if(i == 1)
        {
#ifdef BSP_HARD_I2C2_SPEED
            config.speed = BSP_HARD_I2C2_SPEED;
#else
            config.speed = RT_I2C_SPEED_100KHZ;
#endif
        }
        else
        {
            config.speed = RT_I2C_SPEED_100KHZ;
        }
        ret = hard_i2c_bus_obj[i].configure(&hard_i2c_bus_obj[i].i2c_bus,config);

/*解锁*/
        ret = stm32_i2c_bus_unlock(&hard_i2c_bus_obj[i]);
        RT_ASSERT(ret == RT_EOK);

ret = rt_i2c_bus_device_register(&hard_i2c_bus_obj[i].i2c_bus,hard_i2c_bus_obj[i].config->bus_name);
        RT_ASSERT(ret == RT_EOK);
        LOG_D("%s bus init done", hard_i2c_bus_obj[i].config->bus_name);
        strcpy(str,hard_i2c_bus_obj[i].config->bus_name);
        strcat(str,"_tx");
        hard_i2c_bus_obj[i].tx_notice = rt_sem_create(str, 0, RT_IPC_FLAG_FIFO);
        strcpy(str,hard_i2c_bus_obj[i].config->bus_name);
        strcat(str,"_rx");
        hard_i2c_bus_obj[i].rx_notice = rt_sem_create(str, 0, RT_IPC_FLAG_FIFO);
    }
    return ret;
}

#ifdef BSP_USING_HARD_I2C1
void I2C1_EV_IRQHandler(void)
{
    rt_interrupt_enter();

HAL_I2C_EV_IRQHandler(&hard_i2c_bus_obj[0].handle);

rt_interrupt_leave();
}

void I2C1_ER_IRQHandler(void)
{
    rt_interrupt_enter();

HAL_I2C_ER_IRQHandler(&hard_i2c_bus_obj[0].handle);

rt_interrupt_leave();
}
#endif

#ifdef BSP_USING_HARD_I2C2
void I2C2_EV_IRQHandler(void)
{
    rt_interrupt_enter();

HAL_I2C_EV_IRQHandler(&hard_i2c_bus_obj[1].handle);

rt_interrupt_leave();
}

void I2C2_ER_IRQHandler(void)
{
    rt_interrupt_enter();

HAL_I2C_ER_IRQHandler(&hard_i2c_bus_obj[1].handle);

rt_interrupt_leave();
}
#endif

/*void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c)
{
    ;

}*/

void HAL_I2C_MasterTxCpltCallback(I2C_HandleTypeDef *hi2c)
{
    /* enter interrupt */
    rt_interrupt_enter();

struct stm32_i2c *i2c_drv = rt_container_of(hi2c, struct stm32_i2c, handle);

rt_sem_release(i2c_drv->tx_notice);

/* leave interrupt */
    rt_interrupt_leave();
}
void HAL_I2C_MasterRxCpltCallback(I2C_HandleTypeDef *hi2c)
{
    /* enter interrupt */
    rt_interrupt_enter();

struct stm32_i2c *i2c_drv = rt_container_of(hi2c, struct stm32_i2c, handle);

rt_sem_release(i2c_drv->rx_notice);

/* leave interrupt */
    rt_interrupt_leave();
}

void HAL_I2C_MemTxCpltCallback(I2C_HandleTypeDef *hi2c)
{
    /* enter interrupt */
    rt_interrupt_enter();

struct stm32_i2c *i2c_drv = rt_container_of(hi2c, struct stm32_i2c, handle);

rt_sem_release(i2c_drv->tx_notice);

/* leave interrupt */
    rt_interrupt_leave();
}
void HAL_I2C_MemRxCpltCallback(I2C_HandleTypeDef *hi2c)
{
    /* enter interrupt */
    rt_interrupt_enter();

struct stm32_i2c *i2c_drv = rt_container_of(hi2c, struct stm32_i2c, handle);

rt_sem_release(i2c_drv->rx_notice);

/* leave interrupt */
    rt_interrupt_leave();
}

int rt_hw_i2c_init(void)
{
    return rt_hw_i2c_bus_init();
}
INIT_BOARD_EXPORT(rt_hw_i2c_init);

#endif
```
2024年1月4日更新:
	问题已经解决，原因在于中断优先级。
	我这个项目用到了uart1、uart2、i2c1和i2c2,以及几个外部输入中断，最终设置如下：
	1. rt-thread默认把SysTick和PendSV优先级设置为0xFF，就是最低；
	2. rt-thread默认把硬件定时器中断设置为3；
	3. rt-thread默认外部输入中断设置为5；
	4. rt-thread默认没有设置串口中断，那就是默认值0了，所以CubeMX中手动把两个uart设置为2；
	5. i2c1和i2c2在CubeMx中分别设置为0和1（我的项目中不能设置成一致，要不依然存在中断优先的问题，为什么i2c1是0，那是因为i2c1是进行读和写了，i2c2只进行写，只有i2c1存在BTF标志位置1的问题）；

这样，就不会发生i2c状态寄存器中BTF位提前置1导致死循环的问题了，系统始终优先处理i2c中断。
再次感谢评论区对我的帮助！

oxlm 2024-01-01

这家伙很懒，什么也没写！

不简单呀

不简单呀 2024-01-03

这家伙很懒，什么也没写！

开坦克的贝塔

开坦克的贝塔 2024-01-03

这家伙很懒，什么也没写！

不简单呀

不简单呀 2024-01-03

这家伙很懒，什么也没写！

在drv_common.c中，如下

```c
/* SysTick configuration */
void rt_hw_systick_init(void)
{
#if defined (SOC_SERIES_STM32H7)
    HAL_SYSTICK_Config((HAL_RCCEx_GetD1SysClockFreq()) / RT_TICK_PER_SECOND);
#else
    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / RT_TICK_PER_SECOND);
#endif
    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
    HAL_NVIC_SetPriority(SysTick_IRQn, 2, 0);
}
```
原先是0，我改成2了，把i2c1和i2c2改成0和1了，然后就可以正常跑起来了。
你看到的是PendSV和SysTick优先级的同时设定，在context_gcc.S中，如下

```c
/*
 * void rt_hw_context_switch_to(rt_uint32 to);
 * R0 --> to
 */
    .global rt_hw_context_switch_to
    .type rt_hw_context_switch_to, %function
rt_hw_context_switch_to:
    LDR     R1, =rt_interrupt_to_thread
    STR     R0, [R1]

/* set from thread to 0 */
    LDR     R1, =rt_interrupt_from_thread
    MOV     R0, #0
    STR     R0, [R1]

/* set interrupt flag to 1 */
    LDR     R1, =rt_thread_switch_interrupt_flag
    MOV     R0, #1
    STR     R0, [R1]

/* set the PendSV and SysTick exception priority */
    LDR     R0, =SHPR3
    LDR     R1, =PENDSV_PRI_LOWEST
    LDR.W   R2, [R0,#0]             /* read */
    ORR     R1, R1, R2              /* modify */
    STR     R1, [R0]                /* write-back */

LDR     R0, =ICSR               /* trigger the PendSV exception (causes context switch) */
    LDR     R1, =PENDSVSET_BIT
    STR     R1, [R0]

/* restore MSP */
    LDR     r0, =SCB_VTOR
    LDR     r0, [r0]
    LDR     r0, [r0]
    NOP
    MSR     msp, r0

/* enable interrupts at processor level */
    CPSIE   F
    CPSIE   I

/* ensure PendSV exception taken place before subsequent operation */
    DSB
    ISB

/* never reach here! */

```
😓确实，我仔细看了0xE000ED20寄存器的描述，[23:16]是PendSV的优先级，[31:24]是SysTick的优先级，都设置为0xFF了，而且系统初始化中，这个步骤晚于第一次C语言中设置SysTick的优先级。我这次被你成功说迷糊了，也不知道为什么了，确实按照理论，PendSV和SysTick本来就是最低优先级啊！？

oxlm

oxlm 2024-01-04

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不简单呀

不简单呀 2024-01-04

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[@开坦克的贝塔](https://club.rt-thread.org/u/d746c36dc0bb1aa0)
看到你提的这个问题，我又仔细看了我的代码，终于找到了我当初解决问题的根本，如下代码是CubeMx自动生成的，

此段代码是i2c硬件相关的，

```c
/**
* @brief I2C MSP Initialization
* This function configures the hardware resources used in this example
* @param hi2c: I2C handle pointer
* @retval None
*/
void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hi2c->Instance==I2C1)
  {
  /* USER CODE BEGIN I2C1_MspInit 0 */

/* USER CODE END I2C1_MspInit 0 */

__HAL_RCC_GPIOB_CLK_ENABLE();
    /**I2C1 GPIO Configuration
    PB6     ------> I2C1_SCL
    PB7     ------> I2C1_SDA
    */
    GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* Peripheral clock enable */
    __HAL_RCC_I2C1_CLK_ENABLE();
    /* I2C1 interrupt Init */
    HAL_NVIC_SetPriority(I2C1_EV_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(I2C1_EV_IRQn);
    HAL_NVIC_SetPriority(I2C1_ER_IRQn, 14, 0);
    HAL_NVIC_EnableIRQ(I2C1_ER_IRQn);
  /* USER CODE BEGIN I2C1_MspInit 1 */

/* USER CODE END I2C1_MspInit 1 */
  }
  else if(hi2c->Instance==I2C2)
  {
  /* USER CODE BEGIN I2C2_MspInit 0 */

/* USER CODE END I2C2_MspInit 0 */

__HAL_RCC_GPIOB_CLK_ENABLE();
    /**I2C2 GPIO Configuration
    PB10     ------> I2C2_SCL
    PB11     ------> I2C2_SDA
    */
    GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* Peripheral clock enable */
    __HAL_RCC_I2C2_CLK_ENABLE();
    /* I2C2 interrupt Init */
    HAL_NVIC_SetPriority(I2C2_EV_IRQn, 1, 0);
    HAL_NVIC_EnableIRQ(I2C2_EV_IRQn);
    HAL_NVIC_SetPriority(I2C2_ER_IRQn, 14, 0);
    HAL_NVIC_EnableIRQ(I2C2_ER_IRQn);
  /* USER CODE BEGIN I2C2_MspInit 1 */

/* USER CODE END I2C2_MspInit 1 */
  }

}
```
此段代码是uart硬件相关的，
```c
/**
* @brief UART MSP Initialization
* This function configures the hardware resources used in this example
* @param huart: UART handle pointer
* @retval None
*/
void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(huart->Instance==USART1)
  {
  /* USER CODE BEGIN USART1_MspInit 0 */

/* USER CODE END USART1_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_USART1_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();
    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USART1 interrupt Init */
    HAL_NVIC_SetPriority(USART1_IRQn, 2, 0);
    HAL_NVIC_EnableIRQ(USART1_IRQn);
  /* USER CODE BEGIN USART1_MspInit 1 */

/* USER CODE END USART1_MspInit 1 */
  }
  else if(huart->Instance==USART2)
  {
  /* USER CODE BEGIN USART2_MspInit 0 */

/* USER CODE END USART2_MspInit 0 */
    /* Peripheral clock enable */
    __HAL_RCC_USART2_CLK_ENABLE();

__HAL_RCC_GPIOA_CLK_ENABLE();
    /**USART2 GPIO Configuration
    PA2     ------> USART2_TX
    PA3     ------> USART2_RX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_2;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

GPIO_InitStruct.Pin = GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/* USART2 interrupt Init */
    HAL_NVIC_SetPriority(USART2_IRQn, 2, 0);
    HAL_NVIC_EnableIRQ(USART2_IRQn);
  /* USER CODE BEGIN USART2_MspInit 1 */

/* USER CODE END USART2_MspInit 1 */
  }

}
```
解决问题的根本原因在于uart中断，默认uart没有设置中断，也就是默认是0，我当初先设置i2c为0，问题依旧，然后把systick的就手动改成2了，同时也把uart也改成2了，然后就误以为原因在于systick,太感谢你的提醒了，要不真没找到根本原因！

不简单呀

不简单呀 2024-01-04

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3 个回答

用RTT跑流水灯 2023-12-31

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不简单呀 2024-01-03

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CrazyH 2024-01-02

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