[bsp/stm32l496-st-nucleo] add usb device cdc configration

Author: chenyingchun0312

bsp/stm32/stm32l496-st-nucleo/README_zh.md

@@ -96,6 +96,10 @@ msh >
 
 本章节更多详细的介绍请参考 [STM32 系列 BSP 外设驱动使用教程](../docs/STM32系列BSP外设驱动使用教程.md)。
 
+
+
+5. USBD CDC使用，参考文章[STM32L496 USB CDC适配](https://club.rt-thread.org/ask/article/2959.html)
+
 ## 注意事项
 
 - 开机时如果不能打印 RT-Thread 版本信息，请重新选择 PC 端串口调试软件的串口号或将 BSP 中串口的 GPIO 速率调低

bsp/stm32/stm32l496-st-nucleo/applications/SConscript

@@ -6,11 +6,9 @@ src = Split('''
 main.c
 ''')
 
-if GetDepend(['BSP_USING_SPI_LCD']):
-    src += ['lcd_sample.c']
-
-if GetDepend(['PKG_USING_NRF24L01']):
-    src += ['nrf24l01_init.c']
+if GetDepend(['BSP_USING_USBD']):
+    if GetDepend(['RT_USB_DEVICE_CDC']):
+        src += ['uart_sample.c']
 
 CPPPATH = [str(Dir('#')), cwd]
 

bsp/stm32/stm32l496-st-nucleo/applications/uart_sample.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-08-15     misonyo      first implementation.
+ */
+/*
+ * 程序清单：这是一个 串口 设备使用例程
+ * 例程导出了 uart_sample 命令到控制终端
+ * 命令调用格式：uart_sample uart2
+ * 命令解释：命令第二个参数是要使用的串口设备名称，为空则使用默认的串口设备
+ * 程序功能：通过串口输出字符串"hello RT-Thread!"，然后错位输出输入的字符
+*/
+
+#include <rtthread.h>
+
+#define SAMPLE_UART_NAME       "vcom"      /* 串口设备名称 */
+
+/* 用于接收消息的信号量 */
+static struct rt_semaphore rx_sem;
+static rt_device_t serial;
+
+/* 接收数据回调函数 */
+static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
+{
+    /* 串口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 serial_thread_entry(void *parameter)
+{
+    char ch;
+
+    while (1)
+    {
+        /* 从串口读取一个字节的数据，没有读取到则等待接收信号量 */
+        while (rt_device_read(serial, -1, &ch, 1) != 1)
+        {
+            /* 阻塞等待接收信号量，等到信号量后再次读取数据 */
+            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
+        }
+        /* 读取到的数据通过串口错位输出 */
+        ch = ch + 1;
+        rt_device_write(serial, 0, &ch, 1);
+    }
+}
+
+static int uart_sample(int argc, char *argv[])
+{
+    rt_err_t ret = RT_EOK;
+    char uart_name[RT_NAME_MAX];
+    char str[] = "hello RT-Thread!\r\n";
+
+    if (argc == 2)
+    {
+        rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
+    }
+    else
+    {
+        rt_strncpy(uart_name, SAMPLE_UART_NAME, RT_NAME_MAX);
+    }
+
+    /* 查找串口设备 */
+    serial = rt_device_find(uart_name);
+    if (!serial)
+    {
+        rt_kprintf("find %s failed!\n", uart_name);
+        return RT_ERROR;
+    }
+
+    /* 初始化信号量 */
+    rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
+    /* 以中断接收及轮询发送方式打开串口设备 */
+    rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
+    //rt_device_open(serial, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX);
+    /* 设置接收回调函数 */
+    rt_device_set_rx_indicate(serial, uart_input);
+    /* 发送字符串 */
+    rt_device_write(serial, 0, str, (sizeof(str) - 1));
+
+    /* 创建 serial 线程 */
+    rt_thread_t thread = rt_thread_create("serial", serial_thread_entry, RT_NULL, 1024, 25, 10);
+    /* 创建成功则启动线程 */
+    if (thread != RT_NULL)
+    {
+        rt_thread_startup(thread);
+    }
+    else
+    {
+        ret = RT_ERROR;
+    }
+
+    return ret;
+}
+/* 导出到 msh 命令列表中 */
+MSH_CMD_EXPORT(uart_sample, uart device sample);

bsp/stm32/stm32l496-st-nucleo/board/Kconfig

@@ -60,6 +60,11 @@ menu "On-chip Peripheral Drivers"
     config BSP_USING_ON_CHIP_FLASH
         bool "Enable on-chip FLASH"
         default n
+
+    config BSP_USING_USBD
+        bool "Enable OTGFS as USB device"
+        select RT_USING_USB_DEVICE
+        default n 
 
     source "../libraries/HAL_Drivers/Kconfig"