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.

Files at this revision

API Documentation at this revision

Revision 21:ee9f2fa6bdbc, committed 2014-03-27

Comitter:
mbed_official
Date:
Thu Mar 27 09:45:42 2014 +0000
Parent:
20:d38b72fed893
Child:
22:a4b9c279b437
Commit message:
Synchronized with git revision 3d49a491d4dd16466354746d3c329428840f5a03

Full URL: https://github.com/mbedmicro/mbed/commit/3d49a491d4dd16466354746d3c329428840f5a03/

Fixed readNB() bug

Changed in this revision

USBHID/USBHID.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/USBHID/USBHID.cpp	Thu Feb 27 09:45:46 2014 +0000
+++ b/USBHID/USBHID.cpp	Thu Mar 27 09:45:42 2014 +0000
@@ -59,6 +59,9 @@
     uint32_t bytesRead = 0;
     bool result;
     result = USBDevice::readEP_NB(EPINT_OUT, report->data, &bytesRead, MAX_HID_REPORT_SIZE);
+    // if readEP_NB did not succeed, does not issue a readStart
+    if (!result)
+        return false;
     report->length = bytesRead;
     if(!readStart(EPINT_OUT, MAX_HID_REPORT_SIZE))
         return false;