Implement a driver for the Microphone / audio sensor (MP23ABS1) in Sensotile.Box

[jimakos96]

Is your feature request related to a problem? Please describe.
I would like to develop an application which can do audio sampling from the audio sensor in the Sensotile Box

Describe the solution you'd like
I simply like to use the Zephyr ADC API for audio receiving .

Describe alternatives you've considered
I tried to use the STM32HAL drivers functions for the ADC but i wasn't succesful

[erwango]

@jimakos96 I think this is already available using I2S. @avisconti do you confirm ?

[avisconti]

@jimakos96 I think this is already available using I2S. @avisconti do you confirm ?

Unfortnately not. Th Sensortile.box board has a MP23ABS1 microphone with an analog output. All the work I have done was on STM digital microphone with pdm output (like MP34DT05). In the latter case the pdm output can be interfaced to I2S and there is a sample here: zephyr/samples/shields/x_nucleo_iks02a1/microphone

In case of analog microphone I think that the only way is infact to use the ADC to convert from analog to digital, but I do not have much experience on it. So, it would be an interesting exercise for @jimakos96

[erwango]

@jimakos96 instead of the HAL driver, I'd suggest using the ADC zephyr driver

[jimakos96]

ok I will try to implement it using the adc driver for getting audio out of the internal microphone .

[jimakos96]

Hello
I am trying to get some samples from the microphone using the zephyr adc driver using the following code

#include <zephyr.h>
#include <sys/printk.h>

#include <drivers/gpio.h>
#include <usb/usb_device.h>
#include <drivers/uart.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>

#include <drivers/adc.h>
#include <string.h>
uint16_t temp_data[8];

static const struct adc_channel_cfg channel_cfg_0 = {
.channel_id = 8,
};

const struct adc_sequence sequence = {
.channels = BIT(0),
.buffer = temp_data,
.buffer_size = sizeof(temp_data),
.resolution = 12,
};

void main(void)
{

if (usb_enable(NULL)) {
	return;
}
    int ret;
    const struct device *adc_dev = device_get_binding(DT_LABEL(DT_ALIAS(mic)));
    adc_channel_setup(adc_dev, &channel_cfg_0);

    while (1) {
            ret = adc_read(adc_dev, &sequence);
            if (ret != 0) {
                    printk("adc_read() failed with code %d", ret);
            } else {
                    printk("adc_read() value %d\n", temp_data[0]);
            }
    }

}

aliases {
mic= &adc1;
};
&adc1 {
pinctrl-0 = <&adc1_in8_pa3>;
status = "okay";
};

But i am not getting anything .In the board folder i have added the above.