topic Re: CAN reciever interrupt flage problem in S12 / MagniV Microcontrollers

CAN reciever interrupt flage problem

kdn — Thu, 01 Jan 2015 03:22:39 GMT

I am using CAN module of MC9S12XHZ512 microcontroller, I successfully archive transmitting of data from my microcontroller, but problem is that I am able to receive data only one time after that my controller get hang, I think that I have not clear my CAN receiver interrupt flag, can anyone tell me where I can get CAN receiver interrupt flag in datasheet, I post my interrupt code for CAN below. Do MC9S12XHZ512 compiler support sprintf function.

#pragma CODE_SEG __NEAR_SEG NON_BANKED

interrupt void Vcan1RxISR(void)

{

unsigned char RxBuffer[8],u8Length=8;

unsigned int R,temp;

LCD_Cmd(0x80);

R = CAN1RXDSR0;

Convert(R);

LCD_Data(D);

delay();

LCD_Data(C);

delay();

LCD_Data(B);

delay();;

LCD_Data(A);

delay();

PORTA = 0xFF;

CAN1RFLG_RXF = 1;

}

Re: CAN reciever interrupt flage problem

iggi — Wed, 07 Jan 2015 14:16:48 GMT

The flag should be cleared as following, for example:

CANTFLG = 0x01; //Clear the TXE flag in the CTFLG register to indicate this buffer is full

/* The following is another method to clear the TXE flag to indicate this buffer is full in assembly language.

Notice that the LDA and STA instructions are used. DO NOT USE THE BSET Instructions.

#asm

LDAA #0x01;

STAA $0x106;

#endasm

Here is the link to an appnote Scalable Controller Area Network (MSCAN) Interrupts which is a bit old, but still usefull for your purpose.

Regards,

iggi

Re: CAN reciever interrupt flage problem

kdn — Wed, 07 Jan 2015 14:29:25 GMT

I have written at end of my code

CANTFLG = 0x01;

but way is different

CAN1RFLG_RXF = 1;

I think CAN1RFLG_RXF show CAN receiver FIFO is full , I am looking for CAN receiver interrupt flag.

regard

kushal nandanwar

Re: CAN reciever interrupt flage problem

kdn — Wed, 07 Jan 2015 14:31:29 GMT

volatile unsigned int

volatile means ?

Re: CAN reciever interrupt flage problem

lama — Thu, 08 Jan 2015 08:24:43 GMT

Hi,

http://www.barrgroup.com/Embedded-Systems/How-To/C-Volatile-Keyword

Best regards,

Ladislav

Re: CAN reciever interrupt flage problem

kdn — Thu, 08 Jan 2015 09:31:25 GMT

I am getting this error

Re: CAN reciever interrupt flage problem

kdn — Thu, 08 Jan 2015 11:30:29 GMT

This code is not working for input capture mode

#pragma CODE_SEG __NEAR_SEG NON_BANKED

interrupt void IC0_ISR(void)

{

// new_capture = TC0; //save the value of input capture register

LCD_Cmd(0x80);

PORTA = 0xFF;

t[i]=TC0;

i++;

if(i==2) {

i=0;

// 6.0742270546073012209196379760675e-8

time_interval=(t[1]-t[0]);

time_period=(float)(0.0000256* time_interval);

frequency= 1/time_period;

sprintf(buffer,"%f",frequency);

for(j=0;j<4;j++)

{

LCD_Data(buffer[j]);

}

TFLG1 = 0x01; //clear interrupt flag

}

interrupt void TOI_ISR(void)

{

TFLG2 = 0x80; //clear interrupt flag

}

unsigned int TM;

/* User includes (#include below this line is not maintained by Processor Expert) */

void main(void)

{

/* Write your local variable definition here */

/*** Processor Expert internal initialization. DON'T REMOVE THIS CODE!!! ***/

PE_low_level_init();

/*** End of Processor Expert internal initialization. ***/

/* Write your code here */

LCDIni();

// LCD_Cmd(0x01);

LCD_Cmd(0x80);

LCD_Data('T');

PPST_PPST0 = 0; //set pull-up

PERT_PERT0 = 1; //enable pull-up

TSCR1 = 0xE7; //enable timer, stop timer during wait and freeze, disable fast flag clear

TIOS_IOS0 = 0; //channel 0 as an input capture

TCTL4 = 0x01; //capture on rising edge

TIE_C0I = 0x01; //enable interrupt on channel 1

TSCR2 = 0x80; //timer overflow interrupt enable, timer prescaler is 0

for(;;){}

/*** Processor Expert end of main routine. DON'T WRITE CODE BELOW!!! ***/

/*** Processor Expert end of main routine. DON'T MODIFY THIS CODE!!! ***/

} /*** End of main routine. DO NOT MODIFY THIS TEXT!!! ***/