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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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41 | ingob | 18 | #include "usb_lib.h" |
19 | #include "hw_config.h" |
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20 | #include "usb_pwr.h" |
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1 | ingob | 21 | /* Private typedef -----------------------------------------------------------*/ |
22 | /* Private define ------------------------------------------------------------*/ |
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23 | /* Private macro -------------------------------------------------------------*/ |
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24 | /* Private variables ---------------------------------------------------------*/ |
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25 | volatile bool fCellSuspended; |
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26 | volatile u8 bDeviceState=UNCONNECTED; /* USB device status */ |
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27 | volatile bool fSuspendEnabled=TRUE; /* true when suspend is possible */ |
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28 | |||
29 | struct { |
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30 | volatile RESUME_STATE eState; |
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31 | volatile u8 bESOFcnt; |
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32 | } ResumeS; |
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33 | /* Extern variables ----------------------------------------------------------*/ |
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34 | /* Private function prototypes -----------------------------------------------*/ |
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35 | /* Extern function prototypes ------------------------------------------------*/ |
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36 | /* Private functions ---------------------------------------------------------*/ |
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37 | /******************************************************************************* |
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38 | * Function Name : PowerOn |
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39 | * Description : |
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40 | * Input : None. |
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41 | * Output : None. |
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42 | * Return : USB_SUCCESS. |
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43 | *******************************************************************************/ |
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44 | RESULT PowerOn(void) |
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45 | { |
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46 | u16 wRegVal; |
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47 | |||
48 | /*** cable plugged-in ? ***/ |
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49 | /*while(!CablePluggedIn());*/ |
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50 | USB_Cable_Config(ENABLE); |
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51 | |||
52 | /*** CNTR_PWDN = 0 ***/ |
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53 | wRegVal = CNTR_FRES; |
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54 | _SetCNTR(wRegVal); |
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55 | |||
56 | /*** CNTR_FRES = 0 ***/ |
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57 | wInterrupt_Mask = 0; |
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58 | _SetCNTR(wInterrupt_Mask); |
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59 | /*** Clear pending interrupts ***/ |
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60 | _SetISTR(0); |
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61 | /*** Set interrupt mask ***/ |
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62 | wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM; |
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63 | _SetCNTR(wInterrupt_Mask); |
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64 | |||
65 | return USB_SUCCESS; |
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66 | } |
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67 | /******************************************************************************* |
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68 | * Function Name : PowerOff |
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69 | * Description : handles switch-off conditions |
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70 | * Input : None. |
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71 | * Output : None. |
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72 | * Return : USB_SUCCESS. |
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73 | *******************************************************************************/ |
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74 | RESULT PowerOff() |
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75 | { |
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76 | /* disable all ints and force USB reset */ |
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77 | _SetCNTR(CNTR_FRES); |
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78 | /* clear interrupt status register */ |
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79 | _SetISTR(0); |
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80 | /* Disable the Pull-Up*/ |
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81 | USB_Cable_Config(DISABLE); |
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82 | /* switch-off device */ |
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83 | _SetCNTR(CNTR_FRES+CNTR_PDWN); |
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84 | /* sw variables reset */ |
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85 | /* ... */ |
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86 | |||
87 | return USB_SUCCESS; |
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88 | } |
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89 | /******************************************************************************* |
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90 | * Function Name : Suspend |
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91 | * Description : sets suspend mode operating conditions |
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92 | * Input : None. |
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93 | * Output : None. |
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94 | * Return : USB_SUCCESS. |
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95 | *******************************************************************************/ |
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96 | void Suspend(void) |
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97 | { |
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98 | u16 wCNTR; |
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99 | fCellSuspended= TRUE; |
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100 | /* suspend preparation */ |
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101 | /* ... */ |
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102 | |||
103 | /* macrocell enters suspend mode */ |
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104 | wCNTR = _GetCNTR(); |
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105 | wCNTR |= CNTR_FSUSP; |
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106 | _SetCNTR(wCNTR); |
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107 | |||
108 | /* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */ |
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109 | /* power reduction */ |
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110 | /* ... on connected devices */ |
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111 | |||
112 | /* force low-power mode in the macrocell */ |
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113 | wCNTR = _GetCNTR(); |
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114 | wCNTR |= CNTR_LPMODE; |
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115 | _SetCNTR(wCNTR); |
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116 | |||
117 | /* switch-off the clocks */ |
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118 | /* ... */ |
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119 | |||
120 | |||
121 | } |
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122 | /******************************************************************************* |
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123 | * Function Name : Resume_Init |
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124 | * Description : Handles wake-up restoring normal operations |
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125 | * Input : None. |
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126 | * Output : None. |
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127 | * Return : USB_SUCCESS. |
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128 | *******************************************************************************/ |
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129 | void Resume_Init(void) |
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130 | { |
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131 | u16 wCNTR; |
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132 | |||
133 | fCellSuspended= FALSE; |
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134 | |||
135 | /* ------------------ ONLY WITH BUS-POWERED DEVICES ---------------------- */ |
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136 | /* restart the clocks */ |
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137 | /* ... */ |
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138 | |||
139 | /* CNTR_LPMODE = 0 */ |
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140 | wCNTR = _GetCNTR(); |
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141 | wCNTR &= (~CNTR_LPMODE); |
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142 | _SetCNTR(wCNTR); |
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143 | |||
144 | /* restore full power */ |
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145 | /* ... on connected devices */ |
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146 | |||
147 | /* reset FSUSP bit */ |
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148 | _SetCNTR(IMR_MSK); |
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149 | |||
150 | /* reverse suspend preparation */ |
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151 | /* ... */ |
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152 | |||
153 | } |
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154 | /******************************************************************************* |
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155 | * Function Name : Resume |
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156 | * Description : This is the state machine handling resume operations and |
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157 | * timing sequence. The control is based on the Resume structure |
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158 | * variables and on the ESOF interrupt calling this subroutine |
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159 | * without changing machine state. |
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160 | * Input : a state machine value (RESUME_STATE) |
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161 | * RESUME_ESOF doesn't change ResumeS.eState allowing |
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162 | * decrementing of the ESOF counter in different states. |
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163 | * Output : None. |
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164 | * Return : None. |
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165 | *******************************************************************************/ |
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166 | void Resume(RESUME_STATE eResumeSetVal) |
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167 | { |
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168 | u16 wCNTR; |
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169 | u16 wRegVal; |
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170 | |||
171 | if(eResumeSetVal != RESUME_ESOF) |
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172 | ResumeS.eState = eResumeSetVal; |
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173 | |||
174 | switch(ResumeS.eState) |
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175 | { |
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176 | case RESUME_EXTERNAL: |
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177 | Resume_Init(); |
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178 | wRegVal = GetFNR(); |
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179 | if(wRegVal & FNR_RXDP) //10 & 11 false conditions |
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180 | { |
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181 | Suspend(); |
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182 | } |
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183 | ResumeS.eState = RESUME_OFF; |
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184 | break; |
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185 | case RESUME_INTERNAL: |
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186 | Resume_Init(); |
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187 | ResumeS.eState = RESUME_START; |
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188 | break; |
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189 | case RESUME_LATER: |
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190 | ResumeS.bESOFcnt = 2; |
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191 | ResumeS.eState = RESUME_WAIT; |
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192 | break; |
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193 | case RESUME_WAIT: |
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194 | ResumeS.bESOFcnt--; |
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195 | if(ResumeS.bESOFcnt == 0) |
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196 | ResumeS.eState = RESUME_START; |
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197 | break; |
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198 | case RESUME_START: |
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199 | wCNTR = _GetCNTR(); |
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200 | wCNTR |= CNTR_RESUME; |
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201 | _SetCNTR(wCNTR); |
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202 | ResumeS.eState = RESUME_ON; |
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203 | ResumeS.bESOFcnt = 10; |
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204 | break; |
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205 | case RESUME_ON: |
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206 | ResumeS.bESOFcnt--; |
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207 | if(ResumeS.bESOFcnt == 0) |
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208 | { |
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209 | wCNTR = _GetCNTR(); |
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210 | wCNTR &= (~CNTR_RESUME); |
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211 | _SetCNTR(wCNTR); |
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212 | ResumeS.eState = RESUME_OFF; |
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213 | } |
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214 | break; |
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215 | case RESUME_OFF: |
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216 | case RESUME_ESOF: |
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217 | default: |
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218 | ResumeS.eState = RESUME_OFF; |
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219 | break; |
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220 | } |
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221 | } |
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222 | /******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/ |