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docs(can): improve dev_can.h docs for batched RX example

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wdfk-prog
2026-02-02 15:32:10 +08:00
committed by R b b666
parent 1eaa85c581
commit 06e829b1b3
1 changed files with 29 additions and 9 deletions
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38
components/drivers/include/drivers/dev_can.h
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@@ -132,22 +132,42 @@ enum CANBAUD
* res = rt_device_control(can_dev, RT_CAN_CMD_START, &cmd_arg);
* RT_ASSERT(res == RT_EOK);
*
* #define CAN_RX_BATCH_SIZE 8
*
* while (1)
* {
* // Block and wait for the semaphore, which is released by the receive callback.
* rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
*
* // Read one frame of data from the CAN device's general message queue.
* rx_msg.hdr_index = -1;
* rt_device_read(can_dev, 0, &rx_msg, sizeof(rx_msg));
*
* // Print the received message's ID and data.
* rt_kprintf("Received a message. ID: 0x%x, Data: ", rx_msg.id);
* for (int i = 0; i < rx_msg.len; i++)
* // Drain all pending frames in batches.
* struct rt_can_msg rx_buf[CAN_RX_BATCH_SIZE];
* rt_ssize_t read_size;
* rt_size_t count;
* do
* {
* rt_kprintf("%02x ", rx_msg.data[i]);
* for (rt_size_t i = 0; i < CAN_RX_BATCH_SIZE; i++)
* {
* rx_buf[i].hdr_index = -1;
* }
*
* read_size = rt_device_read(can_dev, 0, rx_buf, sizeof(rx_buf));
* if (read_size <= 0)
* {
* break;
* }
* count = (rt_size_t)(read_size / sizeof(rx_buf[0]));
* for (rt_size_t i = 0; i < count; i++)
* {
* // Print the received message's ID and data.
* rt_kprintf("Received a message. ID: 0x%x, Data: ", rx_buf[i].id);
* for (int j = 0; j < rx_buf[i].len; j++)
* {
* rt_kprintf("%02x ", rx_buf[i].data[j]);
* }
* rt_kprintf("\n");
* }
* }
* rt_kprintf("\n");
* while(count == CAN_RX_BATCH_SIZE);
* }
* }
*