1 // ************************************************************************** 2 // Custom DPA Handler code example - User peripheral implementation - ADC * 3 // ************************************************************************** 4 // Copyright (c) MICRORISC s.r.o. 5 // 6 // File: $RCSfile: CustomDpaHandler-UserPeripheral-ADC.c,v $ 7 // Version: $Revision: 1.28 $ 8 // Date: $Date: 2021/04/26 15:13:51 $ 9 // 10 // Revision history: 11 // 2017/03/13 Release for DPA 3.00 12 // 2015/08/05 Release for DPA 2.20 13 // 2014/10/31 Release for DPA 2.10 14 // 2014/04/30 Release for DPA 2.00 15 // 16 // ********************************************************************* 17 18 // Online DPA documentation https://doc.iqrf.org/DpaTechGuide/ 19 20 // This example implements the user peripherals ADC 21 // PNUM = 0x20 and PCMD = 0 returns 2 bytes with 10b ADC result from pin C5 (AN4) at PData 22 // PNUM = 0x21 and PCMD = 0 returns 2 bytes with 10b ADC result from pin C1 (AN0) at PData 23 // Works with TR-72 having connected pins RA.5, RC.6 and RB.4 24 // At DDC-SE-01 allows to read: 25 // * Light intensity measurement using a photoresistor 26 // * Voltage measurement using a potentiometer 27 28 // Default IQRF include (modify the path according to your setup) 29 #include "IQRF.h" 30 31 // Default DPA header (modify the path according to your setup) 32 #include "DPA.h" 33 // Default Custom DPA Handler header (modify the path according to your setup) 34 #include "DPAcustomHandler.h" 35 36 // Must be the 1st defined function in the source code in order to be placed at the correct FLASH location! 37 //############################################################################################ 38 bit CustomDpaHandler() 39 //############################################################################################ 40 { 41 // Handler presence mark 42 clrwdt(); 43 44 // Detect DPA event to handle 45 switch ( GetDpaEvent() ) 46 { 47 // ------------------------------------------------- 48 case DpaEvent_Interrupt: 49 // Do an extra quick background interrupt work 50 // ! The time spent handling this event is critical.If there is no interrupt to handle return immediately otherwise keep the code as fast as possible. 51 // ! Make sure the event is the 1st case in the main switch statement at the handler routine.This ensures that the event is handled as the 1st one. 52 // ! It is desirable that this event is handled with immediate return even if it is not used by the custom handler because the Interrupt event is raised on every MCU interrupt and the “empty” return handler ensures the shortest possible interrupt routine response time. 53 // ! Only global variables or local ones marked by static keyword can be used to allow reentrancy. 54 // ! Make sure race condition does not occur when accessing those variables at other places. 55 // ! Make sure( inspect.lst file generated by C compiler ) compiler does not create any hidden temporary local variable( occurs when using division, multiplication or bit shifts ) at the event handler code.The name of such variable is usually Cnumbercnt. 56 // ! Do not call any OS functions except setINDFx(). 57 // ! Do not use any OS variables especially for writing access. 58 // ! All above rules apply also to any other function being called from the event handler code, although calling any function from Interrupt event is not recommended because of additional MCU stack usage. 59 60 DpaHandleReturnTRUE: 61 return TRUE; 62 63 // ------------------------------------------------- 64 case DpaEvent_Init: 65 // Do a one time initialization before main loop starts 66 67 // C5 (AN4) as input 68 TRISA.5 = 1; 69 TRISC.6 = 1; 70 TRISB.4 = 1; 71 72 break; 73 74 // ------------------------------------------------- 75 case DpaEvent_DpaRequest: 76 // Called to interpret DPA request for peripherals 77 // ------------------------------------------------- 78 // Peripheral enumeration 79 if ( IsDpaEnumPeripheralsRequest() ) 80 { 81 // We implement 1 user peripheral 82 _DpaMessage.EnumPeripheralsAnswer.UserPerNr = 2; 83 FlagUserPer( _DpaMessage.EnumPeripheralsAnswer.UserPer, PNUM_USER + 0 ); 84 FlagUserPer( _DpaMessage.EnumPeripheralsAnswer.UserPer, PNUM_USER + 1 ); 85 _DpaMessage.EnumPeripheralsAnswer.HWPID = 0x000F; 86 _DpaMessage.EnumPeripheralsAnswer.HWPIDver = 0xabcd; 87 88 goto DpaHandleReturnTRUE; 89 } 90 // ------------------------------------------------- 91 // Get information about peripheral 92 else if ( IsDpaPeripheralInfoRequest() ) 93 { 94 if ( _PNUM == PNUM_USER + 0 || _PNUM == PNUM_USER + 1 ) 95 { 96 _DpaMessage.PeripheralInfoAnswer.PerT = PERIPHERAL_TYPE_ADC; 97 _DpaMessage.PeripheralInfoAnswer.PerTE = PERIPHERAL_TYPE_EXTENDED_READ; 98 goto DpaHandleReturnTRUE; 99 } 100 101 break; 102 } 103 // ------------------------------------------------- 104 else 105 { 106 // Handle peripheral command 107 if ( _PNUM == PNUM_USER + 0 || _PNUM == PNUM_USER + 1 ) 108 { 109 // Check command 110 if ( _PCMD != 0 ) 111 DpaApiReturnPeripheralError( ERROR_PCMD ); 112 113 // Check data length 114 if ( _DpaDataLength != 0 ) 115 DpaApiReturnPeripheralError( ERROR_DATA_LEN ); 116 117 if ( _PNUM == PNUM_USER + 0 ) 118 { 119 // ADC init (for more info see PIC datasheet) pin C5 (AN4) as analog input 120 ANSELA.5 = 1; 121 // ADC setting (AN4 channel) 122 ADCON0 = 0b0.00100.01; 123 } 124 else 125 { 126 // ADC init (for more info see PIC datasheet) pin C1 (AN0) as analog input 127 ANSELA.0 = 1; 128 // ADC setting (AN0 channel) 129 ADCON0 = 0b0.00000.01; 130 } 131 132 // ADC result - right justified, Fosc/8 133 ADCON1 = 0b10010000; 134 135 // start ADC 136 GO = 1; 137 // wait for ADC finish 138 while ( GO ); 139 140 // 10b result is stored in ADRESH and ADRESL 141 _DpaMessage.Response.PData[1] = ADRESH & 0x03; 142 _DpaMessage.Response.PData[0] = ADRESL; 143 _DpaDataLength = sizeof( uns16 ); 144 145 goto DpaHandleReturnTRUE; 146 } 147 } 148 } 149 150 return FALSE; 151 } 152 153 //############################################################################################ 154 // Default Custom DPA Handler header; 2nd include to implement Code bumper to detect too long code of the Custom DPA Handler (modify the path according to your setup) 155 #include "DPAcustomHandler.h" 156 //############################################################################################