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RT-Thread based Software Package Development Guide

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中文版

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To use CherryUSB package, you need to select it in the RT-Thread package manager. The specific path is as follows:

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-> RT-Thread online packages
+    -> system packages
+        --- CherryUSB: tiny and portable USB stack for embedded system with USB IP
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+            CherryUSB Options  ---->
+                    USB Speed (FS)  --->
+                    [*] Enable usb device mode
+                    [*]   Enable usb cdc acm device
+                    [ ]   Enable usb hid device
+                    [ ]   Enable usb dfu device
+                    [ ]   Enable usb msc device
+                    [ ]   Enable usb hub device
+                    [ ]   Enable usb audio device
+                    [ ]   Enable usb video device
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+            Version (latest)  --->
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Based ON STM32 Platform

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Please note that stm32 series have two usb ip. For usb ip, like stm32f0、stm32f1、stm32f3, for usb otg ip(as we know it is from synopsys),like stm32f4、stm32f7 and so on.

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Use USB Device

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  • Firstly,you should have a bsp project,and then go to board\CubeMX_Config directory, open file that suffix name with .ioc in STM32CubeMX.

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  • Enable USB or USB_OTG_FS or USB_OTG_HS in Connectivity List,enable USB IRQ in NVIC Setting.

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STM32CubeMX USB setting

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  • Enable USB Clock for 48Mhz in Clock configuration.

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STM32CubeMX USB clock

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  • Generate code.

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  • Copy SystemClock_Config into board.c.

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  • ~~Copy MX_USB_OTG_FS_PCD_Init or MX_USB_OTG_HS_PCD_Init into main.c if you use usb_dc_hal.c.Also, USB Irq from it.c needs the same.~~

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  • Implement usb_dc_low_level_init and copy codes in from HAL_PCD_MspInit.

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void usb_dc_low_level_init(void)
+{
+    /* Peripheral clock enable */
+    __HAL_RCC_USB_CLK_ENABLE();
+    /* USB interrupt Init */
+    HAL_NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 0, 0);
+    HAL_NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
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+}
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  • Implement printf or modify with rt_kprintf in usb_utils.h, usb stack needs.

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  • Now we can call some functions provided by usb_stack.Your should register descriptors、interfaces and endpoint callback firstly, and then call usb_dc_init. Example is as follows:

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int main(void)
+{
+    extern void cdc_init(void);
+    cdc_init();
+    usb_dc_init();
+    while (1)
+    {
+        uint8_t data_buffer[10] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x31, 0x32, 0x33, 0x34, 0x35 };
+        usbd_ep_write(0x81, data_buffer, 10, NULL);
+        rt_thread_mdelay(500);
+    }
+}
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CDC Demo Demonstration

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CDC Demo

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Video manual

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If you have problem from steps above, you can see this video：Use USB Stack in RT-Thread package manager。

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