添加一些关于midi播放的项目
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terryLP
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/**
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******************************************************************************
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* @file usb_pwr.c
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* @author MCD Application Team
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* @version V4.1.0
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* @date 26-May-2017
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* @brief Connection/disconnection & power management
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "usb_lib.h"
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#include "usb_pwr.h"
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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__IO uint32_t bDeviceState = UNCONNECTED; /* USB device status */
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__IO bool fSuspendEnabled = TRUE; /* true when suspend is possible */
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__IO uint32_t EP[8];
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struct
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{
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__IO RESUME_STATE eState;
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__IO uint8_t bESOFcnt;
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}
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ResumeS;
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__IO uint32_t remotewakeupon=0;
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/* Extern variables ----------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Extern function prototypes ------------------------------------------------*/
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/* Private functions ---------------------------------------------------------*/
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/**
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* Function Name : PowerOn
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* Description :
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* Input : None.
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* Output : None.
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* Return : USB_SUCCESS.
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*/
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RESULT PowerOn(void)
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{
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uint16_t wRegVal;
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#if !defined (USE_NUCLEO)
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/*** cable plugged-in ? ***/
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USB_Cable_Config(ENABLE);
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#endif
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/*** CNTR_PWDN = 0 ***/
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wRegVal = CNTR_FRES;
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_SetCNTR(wRegVal);
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/* The following sequence is recommended:
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1- FRES = 0
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2- Wait until RESET flag = 1 (polling)
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3- clear ISTR register */
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/*** CNTR_FRES = 0 ***/
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wInterrupt_Mask = 0;
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_SetCNTR(wInterrupt_Mask);
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/* Wait until RESET flag = 1 (polling) */
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while((_GetISTR()&ISTR_RESET) == 1);
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/*** Clear pending interrupts ***/
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SetISTR(0);
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/*** Set interrupt mask ***/
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wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM;
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_SetCNTR(wInterrupt_Mask);
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return USB_SUCCESS;
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}
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/**
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* Function Name : PowerOff
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* Description : handles switch-off conditions
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* Input : None.
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* Output : None.
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* Return : USB_SUCCESS.
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**/
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RESULT PowerOff()
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{
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/* disable all interrupts and force USB reset */
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_SetCNTR(CNTR_FRES);
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/* clear interrupt status register */
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_SetISTR(0);
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#if !defined (USE_NUCLEO)
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/* Disable the Pull-Up*/
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USB_Cable_Config(DISABLE);
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#endif
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/* switch-off device */
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_SetCNTR(CNTR_FRES + CNTR_PDWN);
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/* sw variables reset */
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/* ... */
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return USB_SUCCESS;
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}
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/**
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* Function Name : Suspend
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* Description : sets suspend mode operating conditions
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* Input : None.
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* Output : None.
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* Return : USB_SUCCESS.
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*/
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void Suspend(void)
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{
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uint32_t i =0;
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uint16_t wCNTR;
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#ifdef USB_LOW_PWR_MGMT_SUPPORT
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uint32_t tmpreg = 0;
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__IO uint32_t savePWR_CR=0;
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#endif
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/* suspend preparation */
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/* ... */
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/*Store CNTR value */
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wCNTR = _GetCNTR();
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/* This a sequence to apply a force RESET to handle a robustness case */
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/*Store endpoints registers status */
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for (i=0;i<8;i++) EP[i] = _GetENDPOINT(i);
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/* unmask RESET flag */
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wCNTR|=CNTR_RESETM;
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_SetCNTR(wCNTR);
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/*apply FRES */
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wCNTR|=CNTR_FRES;
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_SetCNTR(wCNTR);
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/*clear FRES*/
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wCNTR&=~CNTR_FRES;
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_SetCNTR(wCNTR);
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/*poll for RESET flag in ISTR*/
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while((_GetISTR()&ISTR_RESET) == 0);
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/* clear RESET flag in ISTR */
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_SetISTR((uint16_t)CLR_RESET);
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/*restore Enpoints*/
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for (i=0;i<8;i++)
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_SetENDPOINT(i, EP[i]);
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/* Now it is safe to enter macrocell in suspend mode */
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wCNTR |= CNTR_FSUSP;
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_SetCNTR(wCNTR);
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/* force low-power mode in the macrocell */
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wCNTR = _GetCNTR();
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wCNTR |= CNTR_LPMODE;
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_SetCNTR(wCNTR);
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#ifdef USB_LOW_PWR_MGMT_SUPPORT
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/*prepare entry in low power mode (STOP mode)*/
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/* Select the regulator state in STOP mode*/
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savePWR_CR = PWR->CR;
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tmpreg = PWR->CR;
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/* Clear PDDS and LPDS bits */
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tmpreg &= ((uint32_t)0xFFFFFFFC);
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/* Set LPDS bit according to PWR_Regulator value */
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tmpreg |= PWR_Regulator_LowPower;
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/* Store the new value */
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PWR->CR = tmpreg;
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/* Set SLEEPDEEP bit of Cortex System Control Register */
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#if defined(STM32F303xE) || defined(STM32F302x8) || defined(STM32F303xC) || defined (STM32F37X)
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SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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#else
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SCB->SCR |= SCB_SCR_SLEEPDEEP;
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#endif
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/* enter system in STOP mode, only when wakeup flag in not set */
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if((_GetISTR()&ISTR_WKUP)==0)
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{
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__WFI();
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/* Reset SLEEPDEEP bit of Cortex System Control Register */
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#if defined(STM32F303xE) || defined(STM32F302x8) || defined(STM32F303xC) || defined (STM32F37X)
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SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
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#else
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SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);
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#endif
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}
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else
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{
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/* Clear Wakeup flag */
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_SetISTR(CLR_WKUP);
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/* clear FSUSP to abort entry in suspend mode */
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wCNTR = _GetCNTR();
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wCNTR&=~CNTR_FSUSP;
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_SetCNTR(wCNTR);
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/*restore sleep mode configuration */
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/* restore Power regulator config in sleep mode*/
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PWR->CR = savePWR_CR;
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/* Reset SLEEPDEEP bit of Cortex System Control Register */
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#if defined(STM32F303xE) || defined(STM32F302x8) || defined(STM32F303xC) || defined (STM32F37X)
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SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP_Msk);
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#else
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SCB->SCR &= (uint32_t)~((uint32_t)SCB_SCR_SLEEPDEEP);
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#endif
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}
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#endif /* USB_LOW_PWR_MGMT_SUPPORT */
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}
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/**
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* Function Name : Resume_Init
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* Description : Handles wake-up restoring normal operations
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* Input : None.
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* Output : None.
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* Return : USB_SUCCESS.
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*/
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void Resume_Init(void)
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{
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uint16_t wCNTR;
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/* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */
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/* restart the clocks */
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/* ... */
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/* CNTR_LPMODE = 0 */
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wCNTR = _GetCNTR();
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wCNTR &= (~CNTR_LPMODE);
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_SetCNTR(wCNTR);
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#ifdef USB_LOW_PWR_MGMT_SUPPORT
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/* restore full power */
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/* ... on connected devices */
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Leave_LowPowerMode();
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#endif /* USB_LOW_PWR_MGMT_SUPPORT */
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/* reset FSUSP bit */
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_SetCNTR(IMR_MSK);
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/* reverse suspend preparation */
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/* ... */
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}
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/*******************************************************************************
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* Function Name : Resume
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* Description : This is the state machine handling resume operations and
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* timing sequence. The control is based on the Resume structure
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* variables and on the ESOF interrupt calling this subroutine
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* without changing machine state.
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* Input : a state machine value (RESUME_STATE)
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* RESUME_ESOF doesn't change ResumeS.eState allowing
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* decrementing of the ESOF counter in different states.
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* Output : None.
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* Return : None.
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*******************************************************************************/
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void Resume(RESUME_STATE eResumeSetVal)
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{
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uint16_t wCNTR;
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if (eResumeSetVal != RESUME_ESOF)
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ResumeS.eState = eResumeSetVal;
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switch (ResumeS.eState)
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{
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case RESUME_EXTERNAL:
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if (remotewakeupon ==0)
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{
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Resume_Init();
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ResumeS.eState = RESUME_OFF;
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}
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else /* RESUME detected during the RemoteWAkeup signalling => keep RemoteWakeup handling*/
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{
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ResumeS.eState = RESUME_ON;
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}
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break;
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case RESUME_INTERNAL:
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Resume_Init();
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ResumeS.eState = RESUME_START;
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remotewakeupon = 1;
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break;
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case RESUME_LATER:
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ResumeS.bESOFcnt = 2;
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ResumeS.eState = RESUME_WAIT;
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break;
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case RESUME_WAIT:
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ResumeS.bESOFcnt--;
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if (ResumeS.bESOFcnt == 0)
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ResumeS.eState = RESUME_START;
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break;
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case RESUME_START:
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wCNTR = _GetCNTR();
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wCNTR |= CNTR_RESUME;
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_SetCNTR(wCNTR);
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ResumeS.eState = RESUME_ON;
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ResumeS.bESOFcnt = 10;
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break;
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case RESUME_ON:
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ResumeS.bESOFcnt--;
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if (ResumeS.bESOFcnt == 0)
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{
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wCNTR = _GetCNTR();
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wCNTR &= (~CNTR_RESUME);
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_SetCNTR(wCNTR);
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ResumeS.eState = RESUME_OFF;
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remotewakeupon = 0;
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}
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break;
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case RESUME_OFF:
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case RESUME_ESOF:
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default:
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ResumeS.eState = RESUME_OFF;
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break;
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}
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}
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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