1 // ************************************************************************** 2 // Custom DPA Handler code example - User peripheral implementation - PWM * 3 // ************************************************************************** 4 // Copyright (c) MICRORISC s.r.o. 5 // 6 // File: $RCSfile: CustomDpaHandler-UserPeripheral-PWM.c,v $ 7 // Version: $Revision: 1.34 $ 8 // Date: $Date: 2021/04/26 15:13:51 $ 9 // 10 // Revision history: 11 // 2018/10/25 Release for DPA 3.03 12 // 2017/03/13 Release for DPA 3.00 13 // 2016/09/12 Release for DPA 2.28 14 // 2015/08/05 Release for DPA 2.20 15 // 2014/10/31 Release for DPA 2.10 16 // 2014/04/30 Release for DPA 2.00 17 // 18 // ********************************************************************* 19 20 // Online DPA documentation https://doc.iqrf.org/DpaTechGuide/ 21 22 // This example works only at STD mode, not at LP mode 23 24 // Default IQRF include (modify the path according to your setup) 25 #include "IQRF.h" 26 27 // Default DPA header (modify the path according to your setup) 28 #include "DPA.h" 29 // Default Custom DPA Handler header (modify the path according to your setup) 30 #include "DPAcustomHandler.h" 31 32 // Structure for CMD_PWM_SET 33 typedef struct 34 { 35 uns8 Prescaler; 36 uns8 Period; 37 uns8 Duty; 38 } STRUCTATTR TPerPwmSet_Request; 39 40 TPerPwmSet_Request PerPwmSet_Request @ _DpaMessage.Request.PData; 41 42 //############################################################################################ 43 44 // Must be the 1st defined function in the source code in order to be placed at the correct FLASH location! 45 //############################################################################################ 46 bit CustomDpaHandler() 47 //############################################################################################ 48 { 49 // Handler presence mark 50 clrwdt(); 51 52 // Detect DPA event to handle 53 switch ( GetDpaEvent() ) 54 { 55 // ------------------------------------------------- 56 case DpaEvent_Interrupt: 57 // Do an extra quick background interrupt work 58 // ! 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. 59 // ! 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. 60 // ! 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. 61 // ! Only global variables or local ones marked by static keyword can be used to allow reentrancy. 62 // ! Make sure race condition does not occur when accessing those variables at other places. 63 // ! 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. 64 // ! Do not call any OS functions except setINDFx(). 65 // ! Do not use any OS variables especially for writing access. 66 // ! 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. 67 68 DpaHandleReturnTRUE: 69 return TRUE; 70 71 // ------------------------------------------------- 72 case DpaEvent_DpaRequest: 73 // Called to interpret DPA request for peripherals 74 // ------------------------------------------------- 75 // Peripheral enumeration 76 if ( IsDpaEnumPeripheralsRequest() ) 77 { 78 // We implement 1 user peripheral 79 _DpaMessage.EnumPeripheralsAnswer.UserPerNr = 1; 80 FlagUserPer( _DpaMessage.EnumPeripheralsAnswer.UserPer, PNUM_USER + 0 ); 81 _DpaMessage.EnumPeripheralsAnswer.HWPID = 0x000F; 82 _DpaMessage.EnumPeripheralsAnswer.HWPIDver = 0xabcd; 83 84 goto DpaHandleReturnTRUE; 85 } 86 // ------------------------------------------------- 87 // Get information about peripheral 88 else if ( IsDpaPeripheralInfoRequest() ) 89 { 90 if ( _PNUM == PNUM_USER + 0 ) 91 { 92 _DpaMessage.PeripheralInfoAnswer.PerT = PERIPHERAL_TYPE_PWM; 93 _DpaMessage.PeripheralInfoAnswer.PerTE = PERIPHERAL_TYPE_EXTENDED_WRITE; 94 goto DpaHandleReturnTRUE; 95 } 96 97 break; 98 } 99 // ------------------------------------------------- 100 else 101 { 102 // Handle peripheral command 103 if ( _PNUM == PNUM_USER + 0 ) 104 { 105 // Check command 106 if ( _PCMD != 0 ) 107 DpaApiReturnPeripheralError( ERROR_PCMD ); 108 109 // Check data length 110 if ( _DpaDataLength != sizeof( PerPwmSet_Request ) ) 111 DpaApiReturnPeripheralError( ERROR_DATA_LEN ); 112 113 // Read module info into bufferINFO 114 moduleInfo(); 115 116 // We use FSR0 to access PerPwmSet structure and to avoid to many MOVLB MCU instructions 117 FSR0 = (uns16)&PerPwmSet_Request; 118 119 #define _Prescaler FSR0[offsetof(TPerPwmSet_Request,Prescaler)] 120 #define _Period FSR0[offsetof(TPerPwmSet_Request,Period)] 121 #define _Duty FSR0[offsetof(TPerPwmSet_Request,Duty)] 122 123 // prescaler has to be in range 0 - 3 124 // 2 LSbs of duty cycle is coded into 4 and 5 bit of prescaler 0b00xx0000 125 if ( ( 0x03 < _Prescaler ) && ( 0x03 < ( _Prescaler >> 4 ) ) ) 126 DpaApiReturnPeripheralError( ERROR_DATA ); 127 128 // Definitions used for TR72 having connected pins 129 #define _OUT_A5 TRISA.5 130 #define _OUT_B4 TRISB.4 131 #define _OUT_C6 TRISC.6 132 #define _PIN_C6 LATC.6 133 134 // PWM setup 135 if ( 0x00 == _Prescaler && 0x00 == _Period && 0x00 == _Duty ) 136 { 137 // Stop PWM 138 _PIN_C6 = 0; 139 140 T6CON = 0; 141 CCPTMRS0 = 0; 142 CCP3CON = 0; 143 } 144 else 145 { // Start PWM 146 // TR module with connected pins? 147 if ( bufferINFO[5].7 == 0 ) 148 { 149 _OUT_A5 = 1; 150 _OUT_B4 = 1; 151 } 152 153 // PWM duty cycle 154 CCPR3L = _Duty; 155 // Change duty cycle only 156 CCP3CON = 0b00001100 | ( _Prescaler & 0b00110000 ); 157 158 if ( _Period != PR6 || ( ( _Prescaler ^ T6CON ) & 0b00000011 ) != 0 ) 159 { 160 // Prescaler 161 T6CON = _Prescaler & 0b00000011; 162 163 // Set timer6 as CCP3 timer 164 CCPTMRS0 = 0b00100000; 165 // CCP3 single mode coded from prescaler byte 166 // Select RC6 as P3A function output 167 CCP3SEL = 0; 168 169 PR6 = _Period; // PWM period 170 171 TMR6IF = 0; 172 TMR6ON = 1; 173 // To send a complete duty cycle and period on the first PWM 174 while ( !TMR6IF ); 175 } 176 177 _OUT_C6 = 0; 178 } 179 180 WriteNoError: 181 _DpaDataLength = 0; 182 goto DpaHandleReturnTRUE; 183 } 184 } 185 } 186 187 return FALSE; 188 } 189 190 //############################################################################################ 191 // 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) 192 #include "DPAcustomHandler.h" 193 //############################################################################################