FreeCalypso > hg > fc-tourmaline
annotate src/gpf/osl/os_sem_ir.c @ 51:04aaa5622fa7
disable deep sleep when Iota LEDB is on
TI's Iota chip docs say that CLK13M must be running in order for
LEDB to work, and practical experience on Mot C139 which uses
Iota LEDB for its keypad backlight concurs: if Calypso enters
deep sleep while the keypad backlight is turned on, the light
flickers visibly as the chipset goes into and out of deep sleep.
TI's original L1 sleep manager code had logic to disable deep sleep
when LT_Status() returns nonzero, but that function only works
for B-Sample and C-Sample LT, always returns 0 on BOARD 41 - no
check of Iota LEDB status anywhere. Change this code for our
current hardware: disable deep sleep when Iota LEDB has been
turned on through LLS.
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 19 Oct 2020 05:11:29 +0000 |
parents | 4e78acac3d88 |
children |
rev | line source |
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0
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1 /* |
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2 * This C module is a reconstruction based on the disassembly of |
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3 * os_sem.obj in frame_na7_db_ir.lib from the Leonardo package. |
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4 */ |
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5 |
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6 /* set of included headers from COFF symtab: */ |
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7 #include <stdio.h> |
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8 #include <string.h> |
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9 #include "nucleus.h" |
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10 #include "typedefs.h" |
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11 #include "os.h" |
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12 #include "gdi.h" |
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13 #include "os_types.h" |
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14 #include "os_glob.h" |
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15 |
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16 extern T_OS_SEM_TABLE_ENTRY SemTable[]; |
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17 extern unsigned os_time_to_tick_multiplier; |
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18 |
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19 int |
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20 ReleaseSemaphoreCB(NU_SEMAPHORE *SemCB) |
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21 { |
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22 if (NU_Release_Semaphore(SemCB) == NU_SUCCESS) |
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23 return(OS_OK); |
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24 else |
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25 return(OS_ERROR); |
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26 } |
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27 |
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28 GLOBAL LONG |
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29 os_ReleaseSemaphore(OS_HANDLE TaskHandle, OS_HANDLE SemHandle) |
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30 { |
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31 if (NU_Release_Semaphore(&SemTable[SemHandle].SemCB) == NU_SUCCESS) |
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32 return(OS_OK); |
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33 else |
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34 return(OS_ERROR); |
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35 } |
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36 |
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37 int |
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38 ObtainSemaphoreCB(NU_SEMAPHORE *SemCB, ULONG Timeout, USHORT wait_check) |
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39 { |
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40 UNSIGNED nu_timeout; |
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41 STATUS sts; |
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42 int ret; |
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43 |
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44 ret = OS_OK; |
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45 if (Timeout != OS_SUSPEND) |
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46 nu_timeout = TIME_TO_SYSTEM_TICKS(Timeout); |
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47 else if (wait_check == 1) |
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48 nu_timeout = 1; |
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49 else |
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50 nu_timeout = NU_SUSPEND; |
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51 for (;;) { |
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52 sts = NU_Obtain_Semaphore(SemCB, nu_timeout); |
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53 switch (sts) { |
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54 case NU_SUCCESS: |
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55 return(ret); |
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56 case NU_INVALID_SEMAPHORE: |
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57 return(OS_ERROR); |
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58 case NU_INVALID_SUSPEND: |
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59 nu_timeout = 0; |
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60 continue; |
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61 case NU_TIMEOUT: |
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62 case NU_UNAVAILABLE: |
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63 if (nu_timeout == 1 && wait_check == 1) { |
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64 nu_timeout = NU_SUSPEND; |
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65 ret = OS_WAITED; |
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66 continue; |
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67 } |
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68 return(OS_TIMEOUT); |
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69 default: |
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70 /* |
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71 * Disassembly reveals that the original code |
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72 * has an endless loop here, the equivalent |
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73 * of continue. My guess is that they simply |
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74 * forgot the default case, and so control |
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75 * falls onto the closing brace of the switch |
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76 * and then onto the closing brace of the for |
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77 * loop. But I prefer better error handling, |
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78 * hence the present addition. - Space Falcon |
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79 */ |
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80 return(OS_ERROR); |
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81 } |
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82 } |
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83 } |
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84 |
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85 GLOBAL LONG |
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86 os_ObtainSemaphore(OS_HANDLE TaskHandle, OS_HANDLE SemHandle, ULONG Timeout) |
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87 { |
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88 if (SemHandle > MaxSemaphores) |
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89 return(OS_ERROR); |
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90 return ObtainSemaphoreCB(&SemTable[SemHandle].SemCB, Timeout, 0); |
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91 } |