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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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70353C датащи(PDF) 41 Page - Microchip Technology |
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70353C датащи(HTML) 41 Page - Microchip Technology |
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41 / 76 page  © 2008-2011 Microchip Technology Inc. DS70353C-page 21-41 Section 21. Enhanced Controller Area Network (ECAN™) 21 A code example to transmit an extended remote frame using message buffer 2 is shown in Example 21-3. Example 21-3: Code Example for Transmitting Extended Remote Frame #include <p33Exxxx.h> /* This code example demonstrates a method to configure the ECAN module to transmit Extended ID CAN Remote frames */ /* 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 = 0; /* Set up the CAN module for 250kbps speed with 10 Tq per bit. */ C1CFG1 = 0x47; // BRP = 8 SJW = 2 Tq C1CFG2 = 0x2D2; C1FCTRL = 0xC01F; // No FIFO, 32 Buffers /* Assign 32x8word Message Buffers for ECAN1 in device RAM. This example uses DMA0 for TX. Refer to 21.8.1 “DMA Operation for Transmitting Data” for details on DMA channel configuration for ECAN transmit. */ DMA0CONbits.SIZE = 0x0; DMA0CONbits.DIR = 0x1; DMA0CONbits.AMODE = 0x2; DMA0CONbits.MODE = 0x0; DMA0REQ = 70; DMA0CNT = 7; DMA0PAD = (volatile unsigned int)&C1TXD; DMA0STAL = (unsigned int) &ecan1msgBuf; DMA0STAH = (unsigned int) &ecan1msgBuf; DMA0CONbits.CHEN = 0x1; |
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