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70353C Datasheet(PDF) 48 Page - Microchip Technology |
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70353C Datasheet(HTML) 48 Page - Microchip Technology |
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48 / 76 page  dsPIC33E/PIC24E Family Reference Manual DS70353C-page 21-48 © 2008-2011 Microchip Technology Inc. Example 21-5: Code Example for Filtering Extended Data Frame #include <p33Exxxx.h> /* This code example demonstrates a method to configure the ECAN module to receive Extended ID CAN messages. EID Messages with EID range 0x3FFC0-0x3FFFF will be accepted. */ /* Include fuse configuration code here. Optionally the fuse configuration can be specified via MPLAB IDE Menu operations. */ FUSE_CONFIGURATION_MACROS_COME_HERE #define NUM_OF_ECAN_BUFFERS 32 /* This is the ECAN message buffer declaration. Note the buffer alignment. */ unsigned int ecan1MsgBuf[NUM_OF_ECAN_BUFFERS][8] __attribute__((aligned(NUM_OF_ECAN_BUFFERS * 16))); int main(void) { unsigned long address; /* Place code to set device speed here. For this example the device speed should be set at 40 MHz (i.e., the device is operating at 40 MIPS). */ ConfigureDeviceClockFor40MIPS(); /* The dsPIC33E device features I/O remap. This I/O remap configuration for the ECAN module can be performed here. */ SetIORemapForECANModule(); /* Set up the ECAN1 module to operate at 250 kbps. The ECAN module should be first placed in configuration mode. */ C1CTRL1bits.REQOP = 4; while(C1CTRL1bits.OPMODE != 4); C1CTRL1bits.WIN = 1; /* Set up the CAN module for 250 kbps speed with 10 Tq per bit. */ C1CFG1 = 0x47; // BRP = 8 SJW = 2 Tq C1CFG2 = 0x2D2; C1FCTRL = 0xC01F; // No FIFO, 32 Buffers /* Configure Acceptance Filter Mask 1 * register to mask EID<5:0> * Mask Bits (29-bits) : 0b1 1111 1111 1111 1111 1111 1100 0000 * SID<10:0> : 0b11111111111 ..SID<10:0> or EID<28:18> * EID<17:16> : 0b11 ..EID<17:16> * EID<15:0> : 0b1111111111000000 ..EID<15:0> */ C1RXM1SID = 0xFFEB; C1RXM1EID = 0xFFC0; /* Configure Acceptance Filter 2 to match extended identifier * Filter Bits (29-bits) : 0b0 0000 0000 0011 1111 1111 11xx xxxx * SID<10:0> : 0b00000000000 ..SID<10:0> or EID<28:18> * EID<17:16> : 0b11 ..EID<17:16> * EID<15:0> : 0b1111111111xxxxxx ..EID<15:0> */ C1RXF2SID = 0xB; C1RXF2EID = 0xFFFF; /* Acceptance Filter 2 to use Message Buffer 6 to store message */ C1BUFPNT1bits.F2BP = 0x6; /* Filter 2 enabled for Identifier match with incoming message */ C1FEN1 = 0; C1FEN1bits.FLTEN2 = 0x1; |
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