Tomas Cerskus / USBDevice

USB device stack with Nucleo F401RE support. NOTE: the default clock config needs to be changed to in order for USB to work.

Fork of USBDevice by Tomas Cerskus

Slightly modified original USBDevice library to support F401RE.

On F401RE the data pins of your USB connector should be attached to PA12 (D+) and PA11(D-). It is also required to connect the +5V USB line to PA9.

F401RE requires 48MHz clock for USB. Therefore in order for this to work you will need to change the default clock settings:

Clock settings for USB

#include "stm32f4xx_hal.h"

RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = 16;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = 16;
RCC_OscInitStruct.PLL.PLLN = 336;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
RCC_OscInitStruct.PLL.PLLQ = 7;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
    error("RTC error: LSI clock initialization failed."); 
}

NOTE: Changing the clock frequency might affect the behavior of other libraries. I only tested the Serial library.

UPDATE: Clock settings should not to be changed anymore! Looks like the newer mbed library has the required clock enabled.

USBSerial/CircBuffer.h@1:80ab0d068708, 2012-07-17 (annotated)

Committer:
samux
Date:
Tue Jul 17 14:30:29 2012 +0000
Revision:
1:80ab0d068708
Child:
14:d495202c90f4
Update USBDevice lib

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 1:80ab0d068708 1 /* Copyright (c) 2010-2011 mbed.org, MIT License
samux 1:80ab0d068708 2 *
samux 1:80ab0d068708 3 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
samux 1:80ab0d068708 4 * and associated documentation files (the "Software"), to deal in the Software without
samux 1:80ab0d068708 5 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
samux 1:80ab0d068708 6 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
samux 1:80ab0d068708 7 * Software is furnished to do so, subject to the following conditions:
samux 1:80ab0d068708 8 *
samux 1:80ab0d068708 9 * The above copyright notice and this permission notice shall be included in all copies or
samux 1:80ab0d068708 10 * substantial portions of the Software.
samux 1:80ab0d068708 11 *
samux 1:80ab0d068708 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
samux 1:80ab0d068708 13 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
samux 1:80ab0d068708 14 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
samux 1:80ab0d068708 15 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
samux 1:80ab0d068708 16 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
samux 1:80ab0d068708 17 */
samux 1:80ab0d068708 18
samux 1:80ab0d068708 19 #ifndef CIRCBUFFER_H
samux 1:80ab0d068708 20 #define CIRCBUFFER_H
samux 1:80ab0d068708 21
samux 1:80ab0d068708 22 template <class T>
samux 1:80ab0d068708 23 class CircBuffer {
samux 1:80ab0d068708 24 public:
samux 1:80ab0d068708 25 CircBuffer(int length) {
samux 1:80ab0d068708 26 write = 0;
samux 1:80ab0d068708 27 read = 0;
samux 1:80ab0d068708 28 size = length + 1;
samux 1:80ab0d068708 29 buf = (T *)malloc(size * sizeof(T));
samux 1:80ab0d068708 30 };
samux 1:80ab0d068708 31
samux 1:80ab0d068708 32 bool isFull() {
samux 1:80ab0d068708 33 return ((write + 1) % size == read);
samux 1:80ab0d068708 34 };
samux 1:80ab0d068708 35
samux 1:80ab0d068708 36 bool isEmpty() {
samux 1:80ab0d068708 37 return (read == write);
samux 1:80ab0d068708 38 };
samux 1:80ab0d068708 39
samux 1:80ab0d068708 40 void queue(T k) {
samux 1:80ab0d068708 41 if (isFull()) {
samux 1:80ab0d068708 42 read++;
samux 1:80ab0d068708 43 read %= size;
samux 1:80ab0d068708 44 }
samux 1:80ab0d068708 45 buf[write++] = k;
samux 1:80ab0d068708 46 write %= size;
samux 1:80ab0d068708 47 }
samux 1:80ab0d068708 48
samux 1:80ab0d068708 49 uint16_t available() {
samux 1:80ab0d068708 50 return (write >= read) ? write - read : size - read + write;
samux 1:80ab0d068708 51 };
samux 1:80ab0d068708 52
samux 1:80ab0d068708 53 bool dequeue(T * c) {
samux 1:80ab0d068708 54 bool empty = isEmpty();
samux 1:80ab0d068708 55 if (!empty) {
samux 1:80ab0d068708 56 *c = buf[read++];
samux 1:80ab0d068708 57 read %= size;
samux 1:80ab0d068708 58 }
samux 1:80ab0d068708 59 return(!empty);
samux 1:80ab0d068708 60 };
samux 1:80ab0d068708 61
samux 1:80ab0d068708 62 private:
samux 1:80ab0d068708 63 volatile uint16_t write;
samux 1:80ab0d068708 64 volatile uint16_t read;
samux 1:80ab0d068708 65 uint16_t size;
samux 1:80ab0d068708 66 T * buf;
samux 1:80ab0d068708 67 };
samux 1:80ab0d068708 68
samux 1:80ab0d068708 69 #endif