Thank you for you response AnjanaM_61
I have use the hal_adc example and got result in serial terminal. But in CYBT-343026-01 documents, they have mentioned as - ADC for audio (12 bits) and DC measurement (10 bits).
accorcing to the code
raw_val = wiced_hal_adc_read_raw_sample( ADC_INPUT_P33); //which is GPIO_3 pin no 22
voltage_val = wiced_hal_adc_read_voltage( ADC_INPUT_P33);
WICED_BT_TRACE("Raw value of ADC Channel %d \t: %d\t\t", CHANNEL_TO_MEASURE_DC_VOLT, raw_val);
WICED_BT_TRACE("Voltage value of ADC Channel %d(in mV) : %d\r\n\n", CHANNEL_TO_MEASURE_DC_VOLT, voltage_val);
i am getting output of voltage with 0.050mv difference. but the raw count is -18333 to 17937. in datasheet they have mentioned 10 bits(1024) adc for DC measurement.
And ANALOG core supply i.e VDDC is the internal voltage?
And in CYW920706WCDEVAL Hardware User Guide
it is mentioned J30 = Short this jumper to connect GPIO P15 to VDDIO for battery monitoring applications.
i am not using EVAL Board. and they have not mentioned any pad name GPIO_5 or P15.
In adc.h file ADC_INPUT_P33 = 0x15, //GPIO 5 so does that men i am using the same adc channel.
About ADC Electrical Characteristics in CYBT-343026-01 (CYW20706-A2) . this has some technical details.
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Hi AkJa_4647796 ,
CYBT-343026-01 uses 10 bit for DC measurements & 12 bit for Audio channels.
The full scale count is the supplied voltage (3.3V)
There are two APIs :
wiced_hal_adc_read_raw_sample This will read a 16 bit in 1 sample directly from the register. In this case the full scale value is in signed 16 bits
wiced_hal_adc_read_voltage will do averaging and from the first 10 bits and give an averaged value of say 7 samples. This is done by firmware internally .
So if you wants to sample at very high rate, then you can use raw samples (wiced_hal_adc_read_raw_sample ) but that may have noise. So you have to get few samples and then take an average.
i am applying 2.75 volt to ADC pin (P38 = 11 pin of cybt-343026-01 pad), but while reading adc voltage i am getting output as 2666mv (approx 0.1v difference)
voltage_val = wiced_hal_adc_read_voltage(ADC_INPUT_P38);
WICED_BT_TRACE("Voltage value of ADC Channel %d(in mV) : %d\r\n\n", ADC_INPUT_P38, voltage_val);
What could be the problem?