I want to measure voltages at all 8 channels but when I am enabling all channels its sending the values once only and after that its not sending anything, my requirement is i don't want to use any handler,i am using polling method simultaneously to sample ADC,please suggest if any code available or any support message for the same.
Yes I want to sample all 8 channels, continuously without using handler,I want to prefer sampleconvert() func because there is need afterwards, ii am not using any timer and don't want use it. I just want to sample all ADC pins continuously.
Akshay Khairkar said:Yes I want to sample all 8 channels, continuously without using handler,I want to prefer sampleconvert() func because there is need afterwards, ii am not using any timer and don't want use it. I just want to sample all ADC pins continuously.
This means that you will have to reconfigure for every channel, and call the sample function in a loop.
Which SDK version are you using?
I understand that you do not want to use a handler or a timer, but is there a particular reason for this? Your general application performance might be considerably worse if you do nothing to time or otherwise control when and how fast the samplings happen - but you are of course free to do so.
Best regards,
Karl
I have now updated my previous reply to a working link, thank you for letting me know.
The contents of the link is what I also pasted into my previous comment, namely that you still need to initialize the ADC.
In the code you have shared you are only creating a default config structure, but you are not actually using it for anything.
Please see the ADC Example from the SDK, to see how you may go about initializing the ADC.
Best regards,
Karl
Sorry but I am not able to get can you please directly write the for sampling 2 channel ADC, as i not that good in programming this, can you please write the code for my above shown example code for sampling 2 channel ADC
Could you try to run the ADC example from the SDK that I referenced earlier, and see if you can get that up and running on your board?
Please do, and try to understand what is being done in the examples code.
In order to sample the 2 channels without using any timers or event handler, and with the default ADC and channel configuration, what you would have to add to your application might look something like this:
#include "nrf_drv_adc.h"
static const nrf_drv_adc_channel_t m_channel_config_1 = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_1);
static const nrf_drv_adc_channel_t m_channel_config_2 = NRF_DRV_ADC_DEFAULT_CHANNEL(NRF_ADC_CONFIG_INPUT_2);
static volatile nrf_adc_value_t sample_channel_1 = 0;
static volatile nrf_adc_value_t sample_channel_2 = 0;
static void adc_init(void)
{
ret_code_t err_code;
nrf_drv_adv_config_t config = NRF_DRV_ADC_DEFAULT_CONFIG;
err_code = nrf_drv_adc_init(&config, NULL)
APP_ERROR_CHECK(err_code);
}
static void user_adc_sample_channel_1(void)
{
nrf_drv_adc_sample_convert(&m_channel_config_1, &sample_channel_1);
}
static void user_adc_sample_channel_2(void)
{
nrf_drv_adc_sample_convert(&m_channel_config_2, &sample_channel_2);
}
I think there some misunderstanding nrf_adv_convert_single i didn't found any of reference in nrf SDK nrf_adc_convert_single if it is this then it takes only one argument i.e Analog i/p
Please correct me i am missing some thing.
That was a typo on my end, sorry.
Here is the nrf_drv_adc_sample_convert API Reference documentation.
Best regards,
Karl
That was a typo on my end, sorry.
Here is the nrf_drv_adc_sample_convert API Reference documentation.
Best regards,
Karl
This i have done already also once again done after your post but still the values are not updating, constant values are coming like 538,507 with load without load
Which pins are you connecting your load to? Are you certain that you are connecting to the right pins? - A connection diagram would be a good way to verify this.
How have you measured the voltage, so that you know it does not correspond to the ADC raw output 538?
What formula are you using to convert the raw ADC outputs to voltage?
Best regards,
Karl
I have BLE 400 Waveshare board i am connecting to AN0 pin and AN1 pin and giving 3.3v on that and also for checking connecting it to ground using 10 bit ADC which can give o/p as 2^10 i.e. upto 1024 certainly with or without i/p its giving same value, there is no formula i am using right now i just want some o/p but its giving the o/p as mentioned above queries.
Please verify that you are using the correct pins on the Waveshare board. Could you share with me the pinout of the waveshare board you are using, and how you are testing it?
Akshay Khairkar said:i am connecting to AN0 pin and AN1 pin
I assume you then have changed the code I provided earlier, to reflect this?
Please share with me the code you are currently running.
Akshay Khairkar said:10 bit ADC which can give o/p as 2^10 i.e. upto 1024 certainly with or without i/p its giving same value, there is no formula i am using right now i just want some o/p but its giving the o/p as mentioned above queries.
I do not know what you mean by "o/p", but I agree that reading values in the 500 range using the 10-bit ADC configuration sounds strange.
Best regards,
Karl
Output (O/p) is nothing but value i am getting after reading ADC, I just want ADC to give me some values according to my input to AN0 or AN1 pin still i am not getting any values.Please suggest me if any other ways if available to read multichannel ADC values or tell me if it is hardware restriction