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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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 Posted: Tue Oct 20, 2009 3:15 pm |
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| Quote: |
#define EXT_CAN_CS PIN_D1
#define EXT_CAN_SI PIN_C4
#define EXT_CAN_SO PIN_C5
#define EXT_CAN_SCK PIN_C3
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These pins are wrong. They are swapped.
It should be done like this:
| Code: |
#define EXT_CAN_CS PIN_D1
#define EXT_CAN_SI PIN_C5
#define EXT_CAN_SO PIN_C4
#define EXT_CAN_SCK PIN_C3
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girichavana
Joined: 21 Oct 2008
Posts: 17
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| Posted: Tue Oct 20, 2009 11:36 pm |
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Hi,
Thank you.
With the above modifications I got the loopback mode perfectly.
Now I am trying to transmit the data b/w each other.
I will be thankful if you provide any sample code to tx-rx. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Oct 21, 2009 12:20 am |
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Look at the link that I gave you on the first page of this thread
that has code for two boards to talk to each other. |
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girichavana
Joined: 21 Oct 2008
Posts: 17
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| Posted: Wed Oct 21, 2009 2:22 am |
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Thanks a lot
I got some ack b/w the two nodes
With some other information i will get back to you
Thanks and regards |
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girichavana
Joined: 21 Oct 2008
Posts: 17
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| Posted: Wed Oct 21, 2009 5:48 am |
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Hi,
I worked with your test program and it is working fine
Now I modified your code to work like a chatting system b/w two PC's as shown below
PC-1 <-----> NODE1 <-----> NODE2 <-----> PC-2
NODE1 Code:
| Code: |
//NODE - 1
#include <16F877A.h>
#fuses HS,NOPROTECT,NOLVP,NOWDT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#define CAN_DO_DEBUG FALSE
#define EXT_CAN_CS PIN_D1
#define EXT_CAN_SI PIN_C5
#define EXT_CAN_SO PIN_C4
#define EXT_CAN_SCK PIN_C3
#define BOARD1_ID 24
#define BOARD2_ID 25
#define use_portb_lcd // LCD port
#include "lcd.c"
#include <can-mcp251x.c>
static unsigned char ch;
static int1 temp_flag=0;
#INT_RDA
void RS232_Handler()
{
ch = getch();
temp_flag=1;
}
void main(void)
{
struct rx_stat rxstat;
int32 rx_id;
int32 tx_id;
int8 rx_len;
int8 buffer[8];
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
puts("Can Sample");
lcd_init();
lcd_putc("\f Can Sample \n");
lcd_putc(" NODE --- 1 ");
can_init();
lcd_putc("\f Can Init Cmptd\n");
lcd_putc(" NODE --- 1 ");
puts("Init Completed");
while(1)
{
if(temp_flag==1)
{
disable_interrupts(GLOBAL);
buffer[0]=ch;
can_putd(BOARD2_ID, buffer, 1, 1, 1, 0);
temp_flag=0;
enable_interrupts(GLOBAL);
puts("Ch transmitted");
}
if(can_kbhit()) // Message available ?
{
// If so, get the message.
if(can_getd(rx_id, buffer, rx_len, rxstat))
{
lcd_putc("\f");
lcd_gotoxy(1,1);printf(lcd_putc,"CSTAT=%2x",buffer[0]);
lcd_gotoxy(10,1);printf(lcd_putc,"CTRL=%2x",rx_id);
if(rx_id == BOARD1_ID) // Is it for this board ?
{
lcd_gotoxy(1,2);lcd_putc("Node-2 Data Rcvd");
puts("Data Rcvd Node-2");
}
}
}
}
}
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Node2 code:
| Code: |
//NODE - 2
#include <16F877A.h>
#fuses HS,NOPROTECT,NOLVP,NOWDT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#define CAN_DO_DEBUG FALSE
#define EXT_CAN_CS PIN_D1
#define EXT_CAN_SI PIN_C5
#define EXT_CAN_SO PIN_C4
#define EXT_CAN_SCK PIN_C3
#define BOARD1_ID 24
#define BOARD2_ID 25
#define use_portb_lcd // LCD port
#include "lcd.c"
#include <can-mcp251x.c>
static unsigned char ch;
static int1 temp_flag=0;
#INT_RDA
void RS232_Handler()
{
ch = getch();
temp_flag=1;
}
void main(void)
{
struct rx_stat rxstat;
int32 rx_id;
int32 tx_id;
int8 rx_len;
int8 buffer[8];
enable_interrupts(INT_RDA);
enable_interrupts(GLOBAL);
puts("Can Sample");
lcd_init();
lcd_putc("\f Can Sample \n");
lcd_putc(" NODE --- 2 ");
can_init();
lcd_putc("\f Can Init Cmptd\n");
lcd_putc(" NODE --- 2 ");
puts("Init Completed");
while(1)
{
if(temp_flag==1)
{
disable_interrupts(GLOBAL);
buffer[0]=ch;
can_putd(BOARD1_ID, buffer, 1, 1, 1, 0);
temp_flag=0;
enable_interrupts(GLOBAL);
puts("Ch transmitted");
}
if(can_kbhit()) // Message available ?
{
// If so, get the message.
if(can_getd(rx_id, buffer, rx_len, rxstat))
{
lcd_putc("\f");
lcd_gotoxy(1,1);printf(lcd_putc,"CSTAT=%2x",buffer[0]);
lcd_gotoxy(10,1);printf(lcd_putc,"CTRL=%2x",rx_id);
if(rx_id == BOARD2_ID) // Is it for this board ?
{
lcd_gotoxy(1,2);lcd_putc("Node-1 Data Rcvd");
puts("Data Rcvd Node-1");
}
}
}
}
} |
With the above code I am getting the data transmission from PC2 to PC1
but its not transmitting data from PC1 to PC2.
Please Help |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Oct 21, 2009 12:20 pm |
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| You made the program. You should debug it. |
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taito
Joined: 07 Oct 2013
Posts: 1
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| changing the crystal |
| Posted: Mon Oct 07, 2013 10:52 pm |
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If I were to change the crystal to 20Mhz and try to transmit CAN at 500kbps will the code above suffice for the 16f877a?
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