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denkid1
Guest
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| Help me.. about a CAN Communication |
 Posted: Wed Jan 19, 2005 10:02 am |
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Hello.
I was question this.
but still have a problem.
my english is very poor.
i want to use CAN, but CAN is not response.
i try to programming for 4 days, but I do not success
I need your help.
this codes is a initializing CAN "include "can18xxx8.c" and "can18xxx8.h"
i modified some flag for "500Kbps Baudrates"
| Code: |
void can_init(void) {
can_set_mode(CAN_OP_CONFIG); //must be in config mode before params can be set
can_set_baud();
RXB0CON=0;
RXB0CON.rxm=CAN_RX_VALID;
RXB0CON.rxb0dben=CAN_USE_RX_DOUBLE_BUFFER;
RXB1CON=RXB0CON;
CIOCON.endrhi=CAN_ENABLE_DRIVE_HIGH;
CIOCON.cancap=CAN_ENABLE_CAN_CAPTURE;
can_set_id(RX0MASK, CAN_MASK_ACCEPT_ALL, 1); //set mask 0
can_set_id(RX0FILTER0, 0, 1); //set filter 0 of mask 0
can_set_id(RX0FILTER1, 0, 1); //set filter 1 of mask 0
can_set_id(RX1MASK, CAN_MASK_ACCEPT_ALL, 1); //set mask 1
can_set_id(RX1FILTER2, 0, 1); //set filter 0 of mask 1
can_set_id(RX1FILTER3, 0, 1); //set filter 1 of mask 1
can_set_id(RX1FILTER4, 0, 1); //set filter 2 of mask 1
can_set_id(RX1FILTER5, 0, 1); //set filter 3 of mask 1
set_tris_b((*0xF93 & 0xFB ) | 0x08); //b3 is out, b2 is in
can_set_mode(CAN_OP_NORMAL);
}
////////////////////////////////////////////////////////////////////////
//
// can_set_baud()
//
// Configures the baud rate control registers. All the defines here
// are defaulted in the can-18xxx8.h file. These defaults can, and
// probably should, be overwritten in the main code.
//
// Current defaults are set to work with Microchip's MCP250xxx CAN
// Developers Kit if this PIC is running at 20Mhz.
//
////////////////////////////////////////////////////////////////////////
void can_set_baud(void) {
BRGCON1.brp=4; //baud rate generator prescalar def:4
BRGCON1.sjw=1; //synchronized jump width def:0
BRGCON2.prseg=1; //propagation time select def:2
BRGCON2.seg1ph=3; //phase segment 1 def:5
BRGCON2.sam=0; //sample of the can bus line def:0
BRGCON2.seg2phts=TRUE; //phase segment 2 time select bit def:true (TRUE: freely programmable)
BRGCON3.seg2ph=3; //phase segment 2 time select def:5
BRGCON3.wakfil=FALSE; //selects can bus line filter for wake up bit def:false
}
void can_set_mode(CAN_OP_MODE mode) {
CANCON.reqop=mode;
while( (CANSTAT.opmode) != mode );
}
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this is a main codes
Recieving data and Sending data
| Code: |
while(TRUE)
{
if ( can_kbhit() ) //if data is waiting in buffer...
{
if(can_getd(rx_id, &in_data[0], rx_len, rxstat))
{
}
}
if(ms>2000)
{
ms=0;
can_putd(tx_id, out_data, tx_len,tx_pri,tx_ext,tx_rtr); //put data on transmit buffer
}
}
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CPU : PIC18F258
OSC : 40Mhz (HS with PLL)
help me, please.
i need a help. |
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denkid1
Guest
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| Post.Script. |
| Posted: Wed Jan 19, 2005 10:05 am |
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I use the "2Channel PCI CAN Board"
i wanna commnucation "PCI CAN Board <---> PIC"
help me. |
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Guest
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| Re: Post.Script. |
| Posted: Wed Jan 19, 2005 10:37 am |
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| denkid1 wrote: | I use the "2Channel PCI CAN Board"
i wanna commnucation "PCI CAN Board <---> PIC"
help me.
-------- i can't understand --------------------------------------
PIC (PIN_B2/TXD) <--> TXD(PCA82C251)
PIC (PIN_B3/RXD) <--> RXD(PCA82C251)
--------------------------------------------------------------------
set_tris_b((*0xF93 & 0xFB ) | 0x08); //b3 is out, b2 is in
--------------------------------------------------------------------
out is a RXD? .... PIC PIN_B3 is a RXD..
why these difference?
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