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.

USBMIDI/USBMIDI.cpp

Committer:
tolaipner
Date:
2014-03-30
Revision:
24:4ed3e25c3edc
Parent:
11:eeb3cbbaa996

File content as of revision 24:4ed3e25c3edc:

/* Copyright (c) 2010-2011 mbed.org, MIT License
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include "stdint.h"
#include "USBMIDI.h"


USBMIDI::USBMIDI(uint16_t vendor_id, uint16_t product_id, uint16_t product_release): USBDevice(vendor_id, product_id, product_release) {
    midi_evt = NULL;
    USBDevice::connect();
}

void USBMIDI::write(MIDIMessage m) {
    USBDevice::write(EPBULK_IN, m.data, 4, MAX_PACKET_SIZE_EPBULK);
}


void USBMIDI::attach(void (*fptr)(MIDIMessage)) {
    midi_evt = fptr;
}


bool USBMIDI::EP2_OUT_callback() {
    uint8_t buf[64];
    uint32_t len;
    readEP(EPBULK_OUT, buf, &len, 64);

    if (midi_evt != NULL) {
        for (uint32_t i=0; i<len; i+=4) {
            midi_evt(MIDIMessage(buf+i));
        }
    }

    // We reactivate the endpoint to receive next characters
    readStart(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);
    return true;
}



// Called in ISR context
// Set configuration. Return false if the
// configuration is not supported.
bool USBMIDI::USBCallback_setConfiguration(uint8_t configuration) {
    if (configuration != DEFAULT_CONFIGURATION) {
        return false;
    }

    // Configure endpoints > 0
    addEndpoint(EPBULK_IN, MAX_PACKET_SIZE_EPBULK);
    addEndpoint(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);

    // We activate the endpoint to be able to receive data
    readStart(EPBULK_OUT, MAX_PACKET_SIZE_EPBULK);
    return true;
}


uint8_t * USBMIDI::stringIinterfaceDesc() {
    static uint8_t stringIinterfaceDescriptor[] = {
        0x0c,                           //bLength
        STRING_DESCRIPTOR,              //bDescriptorType 0x03
        'A',0,'u',0,'d',0,'i',0,'o',0   //bString iInterface - Audio
    };
    return stringIinterfaceDescriptor;
}

uint8_t * USBMIDI::stringIproductDesc() {
    static uint8_t stringIproductDescriptor[] = {
        0x16,                                                       //bLength
        STRING_DESCRIPTOR,                                          //bDescriptorType 0x03
        'M',0,'b',0,'e',0,'d',0,' ',0,'A',0,'u',0,'d',0,'i',0,'o',0 //bString iProduct - Mbed Audio
    };
    return stringIproductDescriptor;
}


uint8_t * USBMIDI::configurationDesc() {
    static uint8_t configDescriptor[] = {
        // configuration descriptor
        0x09, 0x02, 0x65, 0x00, 0x02, 0x01, 0x00, 0xc0, 0x50,

        // The Audio Interface Collection
        0x09, 0x04, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x00, // Standard AC Interface Descriptor
        0x09, 0x24, 0x01, 0x00, 0x01, 0x09, 0x00, 0x01, 0x01, // Class-specific AC Interface Descriptor
        0x09, 0x04, 0x01, 0x00, 0x02, 0x01, 0x03, 0x00, 0x00, // MIDIStreaming Interface Descriptors
        0x07, 0x24, 0x01, 0x00, 0x01, 0x41, 0x00,             // Class-Specific MS Interface Header Descriptor

        // MIDI IN JACKS
        0x06, 0x24, 0x02, 0x01, 0x01, 0x00,
        0x06, 0x24, 0x02, 0x02, 0x02, 0x00,

        // MIDI OUT JACKS
        0x09, 0x24, 0x03, 0x01, 0x03, 0x01, 0x02, 0x01, 0x00,
        0x09, 0x24, 0x03, 0x02, 0x06, 0x01, 0x01, 0x01, 0x00,

        // OUT endpoint descriptor
        0x09, 0x05, 0x02, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00,
        0x05, 0x25, 0x01, 0x01, 0x01,

        // IN endpoint descriptor
        0x09, 0x05, 0x82, 0x02, 0x40, 0x00, 0x00, 0x00, 0x00,
        0x05, 0x25, 0x01, 0x01, 0x03,
    };
    return configDescriptor;
}