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60 second delay in external interrupt routine

 
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zephyrtr



Joined: 07 May 2010
Posts: 3

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60 second delay in external interrupt routine
PostPosted: Sun May 16, 2010 5:26 am     Reply with quote
I need to implement an external interrupt service routine that has 60 second delay in it. The ISR will calibrate a robotic device in this time interval. I know that generally using long delays in interrupts is not a good practice. Also I noticed that when I use a long delay in ISR the compiler gives a warning(I have no idea about it)

How can I implement a successful ISR in CCS,with a 60 second delay?

Any help will be welcomed.
Code:

#int_ext

void compass_calibration(void);

void calibration_isr(){
   compass_calibration();
}


Code:

void compass_calibration(){
   
   output_low(pin_b1);
   compass_sync();
   spi_write(0xAA);  //slm
   spi_write(0x06);  //setconfig
   spi_write(0x05);  //cpid - period
   spi_write(0x04);  //period data uint8
   spi_write(0x00);  //terminator
   output_high(pin_b1);
   
   delay_ms(5);
   
   output_low(pin_b1);
   spi_write(0xAA);  //slm
   spi_write(0x0A);  //startcal
   spi_write(0x00);  //terminator
   output_high(pin_b1);
 
/*  output_low(pin_b0);
   while( !input(pin_b3) );
   output_high(pin_b0);*/
   motor_rotate(125,125);
   delay_ms(65000);
   motor_rotate(70,70);
   
   output_low(pin_b1);   
   compass_sync();
   spi_write(0xAA);  //slm
   spi_write(0x0B);  //stopcal
   spi_write(0x00);  //terminator
   output_high(pin_b1);
   
}
Douglas Kennedy



Joined: 07 Sep 2003
Posts: 755
Location: Florida

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PostPosted: Sun May 16, 2010 9:06 am     Reply with quote
Use one interrupt to start another.
The external interrupt starts a timer interrupt that say increments a second counter. The main routine loops waiting for the seconds to reach 60.
It then can reset the seconds counter and disable the timer so a repeat of the whole sequence can occur. The two interrupts free the main routine from being blocked by the delay_ms etc.
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