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| Rev | Author | Line No. | Line |
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| 1 | ingob | 1 | /******************** (C) COPYRIGHT 2006 STMicroelectronics ******************** |
| 2 | * File Name : usb_pwr.c |
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| 3 | * Author : MCD Application Team |
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| 4 | * Date First Issued : 10/01/2006 : V1.0 |
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| 5 | * Description : Connection/disconnection & power management |
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| 6 | ******************************************************************************** |
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| 7 | * History: |
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| 8 | * 10/01/2006 : V1.0 |
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| 9 | ******************************************************************************** |
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| 10 | * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS |
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| 11 | * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. |
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| 12 | * AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT, |
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| 13 | * INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE |
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| 14 | * CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING |
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| 15 | * INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. |
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| 16 | *******************************************************************************/ |
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| 17 | /* Includes ------------------------------------------------------------------*/ |
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| 18 | #include "main.h" |
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| 19 | /* Private typedef -----------------------------------------------------------*/ |
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| 20 | /* Private define ------------------------------------------------------------*/ |
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| 21 | /* Private macro -------------------------------------------------------------*/ |
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| 22 | /* Private variables ---------------------------------------------------------*/ |
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| 23 | volatile bool fCellSuspended; |
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| 24 | volatile u8 bDeviceState=UNCONNECTED; /* USB device status */ |
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| 25 | volatile bool fSuspendEnabled=TRUE; /* true when suspend is possible */ |
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| 26 | |||
| 27 | struct { |
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| 28 | volatile RESUME_STATE eState; |
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| 29 | volatile u8 bESOFcnt; |
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| 30 | } ResumeS; |
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| 31 | /* Extern variables ----------------------------------------------------------*/ |
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| 32 | /* Private function prototypes -----------------------------------------------*/ |
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| 33 | /* Extern function prototypes ------------------------------------------------*/ |
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| 34 | /* Private functions ---------------------------------------------------------*/ |
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| 35 | /******************************************************************************* |
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| 36 | * Function Name : PowerOn |
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| 37 | * Description : |
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| 38 | * Input : None. |
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| 39 | * Output : None. |
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| 40 | * Return : USB_SUCCESS. |
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| 41 | *******************************************************************************/ |
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| 42 | RESULT PowerOn(void) |
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| 43 | { |
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| 44 | u16 wRegVal; |
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| 45 | |||
| 46 | /*** cable plugged-in ? ***/ |
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| 47 | /*while(!CablePluggedIn());*/ |
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| 48 | USB_Cable_Config(ENABLE); |
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| 49 | |||
| 50 | /*** CNTR_PWDN = 0 ***/ |
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| 51 | wRegVal = CNTR_FRES; |
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| 52 | _SetCNTR(wRegVal); |
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| 53 | |||
| 54 | /*** CNTR_FRES = 0 ***/ |
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| 55 | wInterrupt_Mask = 0; |
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| 56 | _SetCNTR(wInterrupt_Mask); |
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| 57 | /*** Clear pending interrupts ***/ |
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| 58 | _SetISTR(0); |
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| 59 | /*** Set interrupt mask ***/ |
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| 60 | wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM; |
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| 61 | _SetCNTR(wInterrupt_Mask); |
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| 62 | |||
| 63 | return USB_SUCCESS; |
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| 64 | } |
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| 65 | /******************************************************************************* |
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| 66 | * Function Name : PowerOff |
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| 67 | * Description : handles switch-off conditions |
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| 68 | * Input : None. |
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| 69 | * Output : None. |
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| 70 | * Return : USB_SUCCESS. |
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| 71 | *******************************************************************************/ |
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| 72 | RESULT PowerOff() |
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| 73 | { |
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| 74 | /* disable all ints and force USB reset */ |
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| 75 | _SetCNTR(CNTR_FRES); |
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| 76 | /* clear interrupt status register */ |
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| 77 | _SetISTR(0); |
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| 78 | /* Disable the Pull-Up*/ |
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| 79 | USB_Cable_Config(DISABLE); |
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| 80 | /* switch-off device */ |
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| 81 | _SetCNTR(CNTR_FRES+CNTR_PDWN); |
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| 82 | /* sw variables reset */ |
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| 83 | /* ... */ |
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| 84 | |||
| 85 | return USB_SUCCESS; |
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| 86 | } |
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| 87 | /******************************************************************************* |
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| 88 | * Function Name : Suspend |
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| 89 | * Description : sets suspend mode operating conditions |
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| 90 | * Input : None. |
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| 91 | * Output : None. |
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| 92 | * Return : USB_SUCCESS. |
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| 93 | *******************************************************************************/ |
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| 94 | void Suspend(void) |
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| 95 | { |
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| 96 | u16 wCNTR; |
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| 97 | fCellSuspended= TRUE; |
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| 98 | /* suspend preparation */ |
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| 99 | /* ... */ |
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| 100 | |||
| 101 | /* macrocell enters suspend mode */ |
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| 102 | wCNTR = _GetCNTR(); |
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| 103 | wCNTR |= CNTR_FSUSP; |
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| 104 | _SetCNTR(wCNTR); |
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| 105 | |||
| 106 | /* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */ |
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| 107 | /* power reduction */ |
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| 108 | /* ... on connected devices */ |
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| 109 | |||
| 110 | /* force low-power mode in the macrocell */ |
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| 111 | wCNTR = _GetCNTR(); |
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| 112 | wCNTR |= CNTR_LPMODE; |
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| 113 | _SetCNTR(wCNTR); |
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| 114 | |||
| 115 | /* switch-off the clocks */ |
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| 116 | /* ... */ |
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| 117 | |||
| 118 | |||
| 119 | } |
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| 120 | /******************************************************************************* |
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| 121 | * Function Name : Resume_Init |
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| 122 | * Description : Handles wake-up restoring normal operations |
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| 123 | * Input : None. |
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| 124 | * Output : None. |
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| 125 | * Return : USB_SUCCESS. |
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| 126 | *******************************************************************************/ |
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| 127 | void Resume_Init(void) |
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| 128 | { |
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| 129 | u16 wCNTR; |
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| 130 | |||
| 131 | fCellSuspended= FALSE; |
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| 132 | |||
| 133 | /* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */ |
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| 134 | /* restart the clocks */ |
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| 135 | /* ... */ |
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| 136 | |||
| 137 | /* CNTR_LPMODE = 0 */ |
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| 138 | wCNTR = _GetCNTR(); |
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| 139 | wCNTR &= (~CNTR_LPMODE); |
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| 140 | _SetCNTR(wCNTR); |
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| 141 | |||
| 142 | /* restore full power */ |
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| 143 | /* ... on connected devices */ |
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| 144 | |||
| 145 | /* reset FSUSP bit */ |
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| 146 | _SetCNTR(IMR_MSK); |
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| 147 | |||
| 148 | /* reverse suspend preparation */ |
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| 149 | /* ... */ |
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| 150 | |||
| 151 | } |
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| 152 | /******************************************************************************* |
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| 153 | * Function Name : Resume |
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| 154 | * Description : This is the state machine handling resume operations and |
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| 155 | * timing sequence. The control is based on the Resume structure |
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| 156 | * variables and on the ESOF interrupt calling this subroutine |
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| 157 | * without changing machine state. |
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| 158 | * Input : a state machine value (RESUME_STATE) |
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| 159 | * RESUME_ESOF doesn't change ResumeS.eState allowing |
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| 160 | * decrementing of the ESOF counter in different states. |
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| 161 | * Output : None. |
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| 162 | * Return : None. |
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| 163 | *******************************************************************************/ |
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| 164 | void Resume(RESUME_STATE eResumeSetVal) |
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| 165 | { |
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| 166 | u16 wCNTR; |
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| 167 | u16 wRegVal; |
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| 168 | |||
| 169 | if(eResumeSetVal != RESUME_ESOF) |
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| 170 | ResumeS.eState = eResumeSetVal; |
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| 171 | |||
| 172 | switch(ResumeS.eState) |
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| 173 | { |
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| 174 | case RESUME_EXTERNAL: |
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| 175 | Resume_Init(); |
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| 176 | wRegVal = GetFNR(); |
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| 177 | if(wRegVal & FNR_RXDP) //10 & 11 false conditions |
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| 178 | { |
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| 179 | Suspend(); |
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| 180 | } |
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| 181 | ResumeS.eState = RESUME_OFF; |
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| 182 | break; |
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| 183 | case RESUME_INTERNAL: |
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| 184 | Resume_Init(); |
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| 185 | ResumeS.eState = RESUME_START; |
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| 186 | break; |
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| 187 | case RESUME_LATER: |
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| 188 | ResumeS.bESOFcnt = 2; |
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| 189 | ResumeS.eState = RESUME_WAIT; |
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| 190 | break; |
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| 191 | case RESUME_WAIT: |
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| 192 | ResumeS.bESOFcnt--; |
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| 193 | if(ResumeS.bESOFcnt == 0) |
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| 194 | ResumeS.eState = RESUME_START; |
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| 195 | break; |
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| 196 | case RESUME_START: |
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| 197 | wCNTR = _GetCNTR(); |
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| 198 | wCNTR |= CNTR_RESUME; |
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| 199 | _SetCNTR(wCNTR); |
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| 200 | ResumeS.eState = RESUME_ON; |
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| 201 | ResumeS.bESOFcnt = 10; |
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| 202 | break; |
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| 203 | case RESUME_ON: |
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| 204 | ResumeS.bESOFcnt--; |
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| 205 | if(ResumeS.bESOFcnt == 0) |
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| 206 | { |
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| 207 | wCNTR = _GetCNTR(); |
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| 208 | wCNTR &= (~CNTR_RESUME); |
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| 209 | _SetCNTR(wCNTR); |
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| 210 | ResumeS.eState = RESUME_OFF; |
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| 211 | } |
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| 212 | break; |
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| 213 | case RESUME_OFF: |
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| 214 | case RESUME_ESOF: |
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| 215 | default: |
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| 216 | ResumeS.eState = RESUME_OFF; |
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| 217 | break; |
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| 218 | } |
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| 219 | } |
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| 220 | /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/ |