Problem about ad sample in cc2530

lun zhang

Other Parts Discussed in Thread: CC2530

hi,

I set 1ms timer in cc2530, i read ad smaple value in 1ms timer interrupt and then start adc conversion, but this influence zigbee communication.If I do not start adc conversion, 1ms timer work good and zigbee communication is ok , I think adc don't take cpu source ,but timer interrupt do.I don't know why this happend,Some code are below:

HAL_ISR_FUNCTION( D_Time4_Interrupt, T4_VECTOR)

{

T4IF=0;
T4CTL=0xd9;

if(ADCCON1 & 0x80)

{

####; //read ad sample

}

ADCCON3=0Xa6; // if i add this instruction ,zigbee communication is not ok, but if i delete it ，communication is ok

}

over 13 years ago

0 YiKai Chen over 13 years ago

Guru 735705 points

1ms timer interrupt for ADC reading is too much over the capability of CC2530. Why do you need to read ADC value so frequently?

0 lun zhang over 13 years ago in reply to YiKai Chen

Prodigy 40 points

I use the parameter from adc reading to control the feedback loop part which needs real-time,it is a solution.

0 YiKai Chen over 13 years ago in reply to lun zhang

Guru 735705 points

If you have to do so, you can try creating a event to do that. Using timer ISR so fast is not a good choice.

0 Greenja over 13 years ago in reply to lun zhang

Guru 22270 points

For a feedback loop (PID) you should be able to get away with up to 10ms for the loop. If you are doing something that requires a tighter control loop, then you should consider a different MCU to handle that. An 8051 based MCU at 32MHz running a tight communications protocal would require some very tight coding to achieve a loop less than 5 ms.

Thanks,

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Problem about ad sample in cc2530