RT-thread Studio 2.2.5
CubeMX 6.6.1
rt-thread驱动包 4.0.3
找到CAN1,并勾选激活,然后直接获取代码(无需任何操作)。然后关闭CubeMX窗口会弹出一个提示框,告诉你:
原先 drivers目录下:stm32f4xx_hal_conf.h文件 重命名为:stm32f4xx_hal_conf_bak.h(即该配置文件失效了)。并在cubemx/lnc目录下重新生成了新的配置文件。
注意:要在 ”cubemx/lnc/stm32f4xx_hal_conf.h“ 中取消对 ”#define HAL_UART_MODULE_ENABLED“ 的注释。因为控制台中有用到串口,这里不取消注释会报错。
- /* 在board.h中添加宏定义 启用CAN*/
- #define BSP_USING_CAN
- #define BSP_USING_CAN1
这两个文件在下面这个目录中:
X:\RT-ThreadStudio\repo\Extract\RT-Thread_Source_Code\RT-Thread\4.0.3\bsp\stm32\libraries\HAL_Drivers
- /*
- * 程序清单:这是一个 CAN 设备使用例程
- * 例程导出了 can_sample 命令到控制终端
- * 命令调用格式:can_sample can1
- * 命令解释:命令第二个参数是要使用的 CAN 设备名称,为空则使用默认的 CAN 设备
- * 程序功能:通过 CAN 设备发送一帧,并创建一个线程接收数据然后打印输出。
- */
-
- #include
- #include "rtdevice.h"
-
- #define CAN_DEV_NAME "can1" /* CAN 设备名称 */
-
- static struct rt_semaphore rx_sem; /* 用于接收消息的信号量 */
- static rt_device_t can_dev; /* CAN 设备句柄 */
-
- /* 接收数据回调函数 */
- static rt_err_t can_rx_call(rt_device_t dev, rt_size_t size)
- {
- /* CAN 接收到数据后产生中断,调用此回调函数,然后发送接收信号量 */
- rt_sem_release(&rx_sem);
-
- return RT_EOK;
- }
-
- static void can_rx_thread(void *parameter)
- {
- int i;
- rt_err_t res;
- struct rt_can_msg rxmsg = {0};
-
- /* 设置接收回调函数 */
- rt_device_set_rx_indicate(can_dev, can_rx_call);
-
- #ifdef RT_CAN_USING_HDR
- struct rt_can_filter_item items[5] =
- {
- RT_CAN_FILTER_ITEM_INIT(0x100, 0, 0, 0, 0x700, RT_NULL, RT_NULL), /* std,match ID:0x100~0x1ff,hdr 为 - 1,设置默认过滤表 */
- RT_CAN_FILTER_ITEM_INIT(0x300, 0, 0, 0, 0x700, RT_NULL, RT_NULL), /* std,match ID:0x300~0x3ff,hdr 为 - 1 */
- RT_CAN_FILTER_ITEM_INIT(0x211, 0, 0, 0, 0x7ff, RT_NULL, RT_NULL), /* std,match ID:0x211,hdr 为 - 1 */
- RT_CAN_FILTER_STD_INIT(0x486, RT_NULL, RT_NULL), /* std,match ID:0x486,hdr 为 - 1 */
- {0x555, 0, 0, 0, 0x7ff, 7,} /* std,match ID:0x555,hdr 为 7,指定设置 7 号过滤表 */
- };
- struct rt_can_filter_config cfg = {5, 1, items}; /* 一共有 5 个过滤表 */
- /* 设置硬件过滤表 */
- res = rt_device_control(can_dev, RT_CAN_CMD_SET_FILTER, &cfg);
- RT_ASSERT(res == RT_EOK);
- #endif
-
- while (1)
- {
- /* hdr 值为 - 1,表示直接从 uselist 链表读取数据 */
- rxmsg.hdr = -1;
- /* 阻塞等待接收信号量 */
- rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
- /* 从 CAN 读取一帧数据 */
- rt_device_read(can_dev, 0, &rxmsg, sizeof(rxmsg));
- /* 打印数据 ID 及内容 */
- rt_kprintf("ID:%x", rxmsg.id);
- for (i = 0; i < 8; i++)
- {
- rt_kprintf("%2x", rxmsg.data[i]);
- }
-
- rt_kprintf("\n");
- }
- }
-
- int can_sample(int argc, char *argv[])
- {
- struct rt_can_msg msg = {0};
- rt_err_t res;
- rt_size_t size;
- rt_thread_t thread;
- char can_name[RT_NAME_MAX];
-
- if (argc == 2)
- {
- rt_strncpy(can_name, argv[1], RT_NAME_MAX);
- }
- else
- {
- rt_strncpy(can_name, CAN_DEV_NAME, RT_NAME_MAX);
- }
- /* 查找 CAN 设备 */
- can_dev = rt_device_find(can_name);
- if (!can_dev)
- {
- rt_kprintf("find %s failed!\n", can_name);
- return RT_ERROR;
- }
-
- /* 初始化 CAN 接收信号量 */
- rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
-
- /* 以中断接收及发送方式打开 CAN 设备 */
- res = rt_device_open(can_dev, RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_INT_RX);
- RT_ASSERT(res == RT_EOK);
- /* 创建数据接收线程 */
- thread = rt_thread_create("can_rx", can_rx_thread, RT_NULL, 1024, 25, 10);
- if (thread != RT_NULL)
- {
- rt_thread_startup(thread);
- }
- else
- {
- rt_kprintf("create can_rx thread failed!\n");
- }
-
- msg.id = 0x78; /* ID 为 0x78 */
- msg.ide = RT_CAN_STDID; /* 标准格式 */
- msg.rtr = RT_CAN_DTR; /* 数据帧 */
- msg.len = 8; /* 数据长度为 8 */
- /* 待发送的 8 字节数据 */
- msg.data[0] = 0x00;
- msg.data[1] = 0x11;
- msg.data[2] = 0x22;
- msg.data[3] = 0x33;
- msg.data[4] = 0x44;
- msg.data[5] = 0x55;
- msg.data[6] = 0x66;
- msg.data[7] = 0x77;
- /* 发送一帧 CAN 数据 */
- size = rt_device_write(can_dev, 0, &msg, sizeof(msg));
- if (size == 0)
- {
- rt_kprintf("can dev write data failed!\n");
- }
-
- return res;
- }
- /* 导出到 msh 命令列表中 */
- MSH_CMD_EXPORT(can_sample, can device sample);