topic Re: ADC mid values in LPC Microcontrollers

ADC mid values

Alexshea — Tue, 14 Jun 2022 17:43:38 GMT

@xiangjun_rong Hello, now thanks to you my code works with all adc channels, however when I used interrupt I used a function to calculate the mid values of 200 samples of my sensors, but now I don't use adc interrupt and I don't know how can I use the function to calculate the mid value.

So as you can see I used to calculate the mid value when I used adc interrupt, but now I don't know how properly can I use calcTemp function. I once again added the intact project

Thanks in advance,

Alex

void calcTemp(uint16_t voltage, float temp) {

calcVolt=(volatge*3.6F)/4096;
temp=(calcVolt*1000.0F);

total+=temp;
countOfSum++;
if(countOfSum==200)
{
countOfSum=0;
realTemp=total/200.0F;
total=0;
flagOfTemp=1;

}
else
ADC_StartCmd(LPC_ADC,ADC_START_NOW);

}

void ADC_IRQHandler()
{
if(ADC_ChannelGetStatus(LPC_ADC,ADC_CHANNEL_0,ADC_DATA_DONE)==0)
{
float temp;
volatge=ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_0);
/*
3 4096
x volt
x=volt*3/4096
*/

calcTemp(volatge,temp);

}
if(ADC_ChannelGetStatus(LPC_ADC,ADC_CHANNEL_1,ADC_DATA_DONE)==0)
{
float temp;
volatge=ADC_ChannelGetData(LPC_ADC,ADC_CHANNEL_1);

calcTemp(volatge,temp);
}
}

Re: ADC mid values

xiangjun_rong — Wed, 15 Jun 2022 03:05:02 GMT

Hi,

void main()

{

......................

Pls try to modify your code like:

#define TOTAL_AVERAGE_NUMBER 200
uint16_t uivoltage;
float temp, totalTemp;
//channel 0 average temperature

//uint16_t temp1=HW_ADC_Read(0);
totalTemp=0;
for (uint16_t i=0; i<TOTAL_AVERAGE_NUMBER; i++)
{
uivoltage=HW_ADC_Read(0);
temp=calcTemp(uivoltage);
totalTemp+=temp;

}
temp=totalTemp/TOTAL_AVERAGE_NUMBER; //the temp is the average temperature in float format.

//channel 1 average temperature

//uint16_t temp1=HW_ADC_Read(1);
totalTemp=0;
for (uint16_t i=0; i<TOTAL_AVERAGE_NUMBER; i++)
{
uivoltage=HW_ADC_Read(1);
temp=calcTemp(uivoltage);
totalTemp+=temp;

}
temp=totalTemp/TOTAL_AVERAGE_NUMBER; //the temp is the average temperature in float format.

.........

}

float calcTemp(uint16_t voltage)
{
float temp;
temp=(volatge*3.6F)/4.096;
return temp;
}

Hope it can help you

XiangJun Rong

Re: ADC mid values

Alexshea — Wed, 15 Jun 2022 12:50:23 GMT

Thank you so much. Will try that

Re: ADC mid values

Alexshea — Fri, 05 Aug 2022 07:43:18 GMT

@xiangjun_rong Hi, I used the code that you recommended, but it doesn't work and I don't receive any temperature. Could you please check the code once again. I added the whole project as you asked