refactor(serial): add host serial framework

Signed-off-by: sakumisu <1203593632@qq.com>
This commit is contained in:
sakumisu
2025-12-12 22:45:10 +08:00
parent 707e865627
commit da2263728a
43 changed files with 4649 additions and 3297 deletions

View File

@@ -1,4 +1,96 @@
usbh_serial
===============
当前仅支持 rt-thread device 框架,包括 cdc acm, ftdi, cp210x, ch34x, pl2303, 具体使用方式参考 rt-thread device api 即可。
Serial 框架当前支持 cdc acm, ftdi, cp210x, ch34x, pl2303gsm 驱动。当前支持两种使用方式,
一种是使用源生 CherryUSB usbhost serial API 进行操作,另一种是基于平台封装的 API 操作,比如 rt-thread device API。nuttx posix API。
下面演示的是使用 CherryUSB usbhost serial API 进行串口回环测试,并且使用阻塞发送,异步读取的方式:
.. code-block:: C
struct usbh_serial *serial;
serial = usbh_serial_open("/dev/ttyACM0", USBH_SERIAL_O_RDWR | USBH_SERIAL_O_NONBLOCK);
if (serial == NULL) {
serial = usbh_serial_open("/dev/ttyUSB0", USBH_SERIAL_O_RDWR | USBH_SERIAL_O_NONBLOCK);
if (serial == NULL) {
USB_LOG_RAW("no serial device found\r\n");
goto delete;
}
}
struct usbh_serial_termios termios;
memset(&termios, 0, sizeof(termios));
termios.baudrate = 115200;
termios.stopbits = 0;
termios.parity = 0;
termios.databits = 8;
termios.rtscts = false;
termios.rx_timeout = 0;
ret = usbh_serial_control(serial, USBH_SERIAL_CMD_SET_ATTR, &termios);
if (ret < 0) {
USB_LOG_RAW("set serial attr error, ret:%d\r\n", ret);
goto delete_with_close;
}
serial_tx_bytes = 0;
while (1) {
/* for common, we use timeout with 0xffffffff, this is just a test */
ret = usbh_serial_write(serial, serial_tx_buffer, sizeof(serial_tx_buffer));
if (ret < 0) {
USB_LOG_RAW("serial write error, ret:%d\r\n", ret);
goto delete_with_close;
} else {
serial_tx_bytes += ret;
usb_osal_msleep(10); // 11.52 Byte/ms at 115200bps --> 64Byte/5.5ms
if (serial_tx_bytes == SERIAL_TEST_LEN) {
USB_LOG_RAW("send over\r\n");
break;
}
}
}
volatile uint32_t wait_timeout = 0;
serial_rx_bytes = 0;
while (1) {
ret = usbh_serial_read(serial, &serial_rx_data[serial_rx_bytes], SERIAL_TEST_LEN);
if (ret < 0) {
USB_LOG_RAW("serial read error, ret:%d\r\n", ret);
goto delete_with_close;
} else {
serial_rx_bytes += ret;
if (serial_rx_bytes == SERIAL_TEST_LEN) {
USB_LOG_RAW("receive over\r\n");
for (uint32_t i = 0; i < SERIAL_TEST_LEN; i++) {
if (serial_rx_data[i] != 0xa5) {
USB_LOG_RAW("serial loopback data error at index %d, data: 0x%02x\r\n", (unsigned int)i, serial_rx_data[i]);
goto delete_with_close;
}
}
USB_LOG_RAW("serial loopback test success\r\n");
break;
}
}
wait_timeout++;
if (wait_timeout > 500) { // 5s
USB_LOG_RAW("serial read timeout\r\n");
goto delete_with_close;
}
usb_osal_msleep(10);
}
usbh_serial_close(serial);
用户需要考虑以下三种场景:
- USB2TTL 设备 + 启用了波特率,这种情况下需要使用 `usbh_serial_write``usbh_serial_read` 进行收发数据, **并且需要根据波特率控制发送频率,防止对端丢包**
- 纯 USB 设备 + 未启动波特率,这种情况下可以使用 `usbh_serial_cdc_write_async``usbh_serial_cdc_read_async` 进行异步收发数据,阻塞则用 `usbh_serial_write` 并且不需要控制发送频率。不可以使用 `usbh_serial_read`
- 纯 USB 设备 + 启动波特率,同 1但是速率打折扣。不可以使用 `usbh_serial_cdc_write_async``usbh_serial_cdc_read_async`。如果是 GSM 设备需要使用第一种。