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AW: [lpc2000] CAN DOIE

AW: [lpc2000] CAN DOIE

2005-09-15 by Gromann, Klaus

Hi Fredrik,

there are 2 things in your code that may cause problems :

1) You don't read the frame status register(CANRFS), so you loose the information if it is a 11-bit or a 29 bit identifier as well as the data length information and the remote request bit.

2) It is written in the comment but not done : release the buffer. To do this, you have to write 1 to bit2 in the command register (CANCMR)

brgds
Klaus

-----Ursprüngliche Nachricht-----
Von: lpc2000@yahoogroups.com im Auftrag von albin_martinsson
Gesendet: Do 15.09.2005 15:35
An: lpc2000@yahoogroups.com
Betreff: [lpc2000] CAN DOIE
 
Hello

Im using the CAN-interface in my application. 
My routine for CAN is interrupt-driven, here is an example of my ISR-
code:

I often get Data Overrun - error on the receive channel.
Anyone who has had the same problem? 
I also use the freeRTOS port for the LPC2129. 

B.R

Fredrik Martinsson, Sweden

void ISR_CANRX (void)
{
   tU32 *cBufdst;
   tU32 Buf[3];

   while (C1GSR&0x01) {
      // Save registers temp.
      Buf[0] = C1RID;
      Buf[1] = C1RDA;
      Buf[2] = C1RDB;
      C1CMR = 0x04;                               
      // release receive buffer
            
            
      if (++can_rxbufin>=CAN_QUEUESIZE)can_rxbufin = 0;
      cBufdst = &can_rxbuf[can_rxbufin].CmRID;
                  
      if (can_rxbufin == can_rxbufout) {
         if (++can_rxbufout>=CAN_QUEUESIZE)can_rxbufout = 0;
      }
      if (++can_rxbufsize>CAN_QUEUESIZE)
can_rxbufsize=CAN_QUEUESIZE;
                  
      *cBufdst = Buf[0];
      cBufdst++;
      *cBufdst = Buf[1];
      cBufdst++;
      *cBufdst = Buf[2];
                  
      // Give semaphore to start comTask
      xSemaphoreGiveFromISR( comSem, pdFALSE );
      }
      
   VICVectAddr = 0xFFFFFFFFL;                         
   // acknowledge Interrupt
}






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AW: [lpc2000] CAN DOIE

2005-09-15 by Gromann, Klaus

Hi Frederik,

sorry, I've overseen the line with the request. So this cannot be the problem.
Is it possible that the IRQ is disabled for a longer time period ?
I use the CAN on LPC2294 now for about 8 weeks and got no problems.

brgds
Klaus


-----Ursprüngliche Nachricht-----
Von: lpc2000@yahoogroups.com im Auftrag von Gromann, Klaus {GGRH~Graz}
Gesendet: Do 15.09.2005 16:16
An: lpc2000@yahoogroups.com
Betreff: AW: [lpc2000] CAN DOIE
 
Hi Fredrik,

there are 2 things in your code that may cause problems :

1) You don't read the frame status register(CANRFS), so you loose the information if it is a 11-bit or a 29 bit identifier as well as the data length information and the remote request bit.

2) It is written in the comment but not done : release the buffer. To do this, you have to write 1 to bit2 in the command register (CANCMR)

brgds
Klaus

-----Ursprüngliche Nachricht-----
Von: lpc2000@yahoogroups.com im Auftrag von albin_martinsson
Gesendet: Do 15.09.2005 15:35
An: lpc2000@yahoogroups.com
Betreff: [lpc2000] CAN DOIE

Hello

Im using the CAN-interface in my application. 
My routine for CAN is interrupt-driven, here is an example of my ISR-
code:

I often get Data Overrun - error on the receive channel.
Anyone who has had the same problem? 
I also use the freeRTOS port for the LPC2129. 

B.R

Fredrik Martinsson, Sweden

void ISR_CANRX (void)
{
   tU32 *cBufdst;
   tU32 Buf[3];

   while (C1GSR&0x01) {
      // Save registers temp.
      Buf[0] = C1RID;
      Buf[1] = C1RDA;
      Buf[2] = C1RDB;
      C1CMR = 0x04;                               
      // release receive buffer
            
            
      if (++can_rxbufin>=CAN_QUEUESIZE)can_rxbufin = 0;
      cBufdst = &can_rxbuf[can_rxbufin].CmRID;
                  
      if (can_rxbufin == can_rxbufout) {
         if (++can_rxbufout>=CAN_QUEUESIZE)can_rxbufout = 0;
      }
      if (++can_rxbufsize>CAN_QUEUESIZE)
can_rxbufsize=CAN_QUEUESIZE;
                  
      *cBufdst = Buf[0];
      cBufdst++;
      *cBufdst = Buf[1];
      cBufdst++;
      *cBufdst = Buf[2];
                  
      // Give semaphore to start comTask
      xSemaphoreGiveFromISR( comSem, pdFALSE );
      }
      
   VICVectAddr = 0xFFFFFFFFL;                         
   // acknowledge Interrupt
}






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[Non-text portions of this message have been removed]

Re: CAN DOIE

2005-09-16 by albin_martinsson

Hi Klaus,

The thing is that I really dont know if the IRQ is disabled for a 
longer time, im using the freeRTOS port for LPC2129 so. If anyone 
here knows, your can pleas tell me, or I will start to have a look 
inside the code for the freeRTOS.

BTW Klaus, in your system, how many systems are talking on the same 
bus? Im using 3 units talking and the Bus Load not greater than 20-
30%. 

B.R 
/Fredrik


--- In lpc2000@yahoogroups.com, "Gromann, Klaus" 
<klaus.gromann@r...> wrote:
> Hi Frederik,
> 
> sorry, I've overseen the line with the request. So this cannot be 
the problem.
> Is it possible that the IRQ is disabled for a longer time period ?
> I use the CAN on LPC2294 now for about 8 weeks and got no problems.
> 
> brgds
> Klaus
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: lpc2000@yahoogroups.com im Auftrag von Gromann, Klaus 
{GGRH~Graz}
> Gesendet: Do 15.09.2005 16:16
> An: lpc2000@yahoogroups.com
> Betreff: AW: [lpc2000] CAN DOIE
>  
> Hi Fredrik,
> 
> there are 2 things in your code that may cause problems :
> 
> 1) You don't read the frame status register(CANRFS), so you loose 
the information if it is a 11-bit or a 29 bit identifier as well as 
the data length information and the remote request bit.
> 
> 2) It is written in the comment but not done : release the buffer. 
To do this, you have to write 1 to bit2 in the command register 
(CANCMR)
> 
> brgds
> Klaus
> 
> -----Ursprüngliche Nachricht-----
> Von: lpc2000@yahoogroups.com im Auftrag von albin_martinsson
> Gesendet: Do 15.09.2005 15:35
> An: lpc2000@yahoogroups.com
> Betreff: [lpc2000] CAN DOIE
> 
> Hello
> 
> Im using the CAN-interface in my application. 
> My routine for CAN is interrupt-driven, here is an example of my 
ISR-
> code:
> 
> I often get Data Overrun - error on the receive channel.
> Anyone who has had the same problem? 
> I also use the freeRTOS port for the LPC2129. 
> 
> B.R
> 
> Fredrik Martinsson, Sweden
> 
> void ISR_CANRX (void)
> {
>    tU32 *cBufdst;
>    tU32 Buf[3];
> 
>    while (C1GSR&0x01) {
>       // Save registers temp.
>       Buf[0] = C1RID;
>       Buf[1] = C1RDA;
>       Buf[2] = C1RDB;
>       C1CMR = 0x04;                               
>       // release receive buffer
>             
>             
>       if (++can_rxbufin>=CAN_QUEUESIZE)can_rxbufin = 0;
>       cBufdst = &can_rxbuf[can_rxbufin].CmRID;
>                   
>       if (can_rxbufin == can_rxbufout) {
>          if (++can_rxbufout>=CAN_QUEUESIZE)can_rxbufout = 0;
>       }
>       if (++can_rxbufsize>CAN_QUEUESIZE)
> can_rxbufsize=CAN_QUEUESIZE;
>                   
>       *cBufdst = Buf[0];
>       cBufdst++;
>       *cBufdst = Buf[1];
>       cBufdst++;
>       *cBufdst = Buf[2];
>                   
>       // Give semaphore to start comTask
>       xSemaphoreGiveFromISR( comSem, pdFALSE );
>       }
>       
>    VICVectAddr = 0xFFFFFFFFL;                         
>    // acknowledge Interrupt
> }
> 
> 
> 
> 
> 
> 
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