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