10 CAN设备打开成功，但是无法发送数据！

发布于 2022-05-27 17:56:15 浏览：996 订阅该版

lljwork2021 2022-05-30

车联网

RTT_STUDY 2022-06-06

笨鸟先飞

RTT_STUDY 2022-06-06

笨鸟先飞

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4 个回答

小小李sunny 2022-05-27

这家伙很懒，什么也没写！

RTT_STUDY 2022-06-06

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哈喽你好啊 2022-05-27

这家伙很懒，什么也没写！

编程菜鸟 2022-05-28

代码改变世界

# drv_can.c修改波特率表格（网上有stm32波特率计算工具或自己计算）
```c
#elif defined (SOC_SERIES_STM32F4)  /* 42MHz or 45MHz */
#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx)|| defined(STM32F417xx) ||\
    defined(STM32F401xC) || defined(STM32F401xE) /* 42MHz(max) */
static const struct stm32_baud_rate_tab can_baud_rate_tab[] =
{
    {CAN1MBaud, (CAN_SJW_2TQ | CAN_BS1_15TQ  | CAN_BS2_5TQ | 2)},
    {CAN800kBaud, (CAN_SJW_2TQ | CAN_BS1_9TQ  | CAN_BS2_3TQ | 4)},
    {CAN500kBaud, (CAN_SJW_2TQ | CAN_BS1_11TQ  | CAN_BS2_2TQ | 6)},
    {CAN250kBaud, (CAN_SJW_2TQ | CAN_BS1_6TQ  | CAN_BS2_1TQ | 21)},
    {CAN125kBaud, (CAN_SJW_2TQ | CAN_BS1_6TQ  | CAN_BS2_1TQ | 42)},
    {CAN100kBaud, (CAN_SJW_2TQ | CAN_BS1_12TQ  | CAN_BS2_2TQ | 28)},
    {CAN50kBaud, (CAN_SJW_2TQ | CAN_BS1_6TQ  | CAN_BS2_1TQ | 105)},
    {CAN20kBaud, (CAN_SJW_2TQ | CAN_BS1_12TQ  | CAN_BS2_2TQ | 140)},
    {CAN10kBaud, (CAN_SJW_2TQ | CAN_BS1_6TQ  | CAN_BS2_1TQ | 525)}
};
#else  /* APB1 45MHz(max) */
```
# 找到CAN设备后，增加CAN波特率设置，
```c
rt_device_control(can_dev, RT_CAN_CMD_SET_BAUD, (void *)CAN500kBaud);
```