ADC method and global variable - MC9S08QG8

neocronos — Thu, 29 Oct 2020 09:02:10 GMT

Hello, I'm working with the MC9S08QG8 and the Processor Expert of the Codewarrior 5.9. I have an ADC bean and I'm using Measure and GetValue8 methods inside a time interrupt:

Code:

void TI1_OnInterrupt(void){ byte medsensor;  bool waitformed;  waitformed = 1;      adc_Measure(waitformed);  adc_GetValue8(&medsensor);    flag = 'Z';}

... and for some weird reason, the global variable flag doesn't keep that 'Z' value, once the program returns to the main, the flag changes it's value to what it had before. I found that making GetValue8 comment (with //) the global variable flag kept the 'Z' value.

GetValue8 code is just:

Code:

byte adc_GetValue8(byte *Values){  if (!OutFlg) {                       /* Is output flag set— */    return ERR_NOTAVAIL;               /* If no then error */  }  Values[0] = adc_OutV[0];             /* Save measured values to the output buffer */  Values[1] = adc_OutV[1];             /* Save measured values to the output buffer */  Values[2] = adc_OutV[2];             /* Save measured values to the output buffer */  Values[3] = adc_OutV[3];             /* Save measured values to the output buffer */  return ERR_OK;                       /* OK */}

Does someone know what is happening?

Thanks

Added p/n to subject.

Message Edited by NLFSJ on 2008-05-21 10:26 PM

Re: ADC method and global variable

allawtterb — Thu, 29 Oct 2020 09:02:12 GMT

You declared medsensor as a single byte but you are trying to put 4 bytes in it. You need to declare medsensor as an array and pass the array.

Code:

void TI1_OnInterrupt(void){ byte medsensor[4];  bool waitformed;  waitformed = 1;      adc_Measure(waitformed);  adc_GetValue8(medsensor);    flag = 'Z';}

Message Edited by allawtterb on 2008-05-20 03:32 PM

Re: ADC method and global variable

neocronos — Thu, 22 May 2008 09:01:01 GMT

My mistake. Thanks!!

topic ADC method and global variable - MC9S08QG8 in 8-bit Microcontrollers

ADC method and global variable - MC9S08QG8

Re: ADC method and global variable

Re: ADC method and global variable