Reading potentiometer sensor value via an ADC HAL

Lab 107

Lab Objective:

This lab demonstrates the process of reading a potentiometer sensor value through an Analog-to-Digital Converter (ADC) using a Hardware Abstraction Layer (HAL) on a PSoC 6 microcontroller.

🔥 Requirements

Resources	Links
Computer	💻
ModusToolbox™ software v3.0 or later	Link
CY8CKIT-062S2-43012 Infineon Board	Link
Technical Report	dropbox

🚩 Let start

Create Application

Create Application

Coding

• Coding: Open the main.c file and add the following code to the main(void) function.

main.c

#include "cy_pdl.h"
#include "cyhal.h"
#include "cybsp.h"
#include "cy_retarget_io.h"


int main(void)
{
    cy_rslt_t result;
	cyhal_adc_t adc_obj;
	cyhal_adc_channel_t adc_chan_0_obj;

    /* Initialize the device and board peripherals */
    result = cybsp_init() ;
    if (result != CY_RSLT_SUCCESS)
    {
        CY_ASSERT(0);
    }

    __enable_irq();

    /* Initialize retarget-io to use the debug UART port */
	result = cy_retarget_io_init(CYBSP_DEBUG_UART_TX, CYBSP_DEBUG_UART_RX, CY_RETARGET_IO_BAUDRATE);
	CY_ASSERT(result == CY_RSLT_SUCCESS);

	/* ADC conversion result. */
	int adc_out;

	/* Initialize ADC. The ADC block which can connect to pin 10[6] is selected */
	result = cyhal_adc_init(&adc_obj, P10_6, NULL);

	// ADC configuration structure
	const cyhal_adc_config_t ADCconfig ={
		.continuous_scanning = false,
		.resolution = 12,
		.average_count = 1,
		.average_mode_flags = 0,
		.ext_vref_mv = 0,
		.vneg = CYHAL_ADC_VNEG_VREF,
		.vref = CYHAL_ADC_REF_VDDA,
		.ext_vref = NC,
		.is_bypassed = false,
		.bypass_pin = NC
	};

	// Configure to use VDD as Vref
	result = cyhal_adc_configure(&adc_obj, &ADCconfig);

	/* Initialize ADC channel, allocate channel number 0 to pin 10[6] as this is the first channel initialized */
	const cyhal_adc_channel_config_t channel_config = { .enable_averaging = false, .min_acquisition_ns = 220, .enabled = true };
	result = cyhal_adc_channel_init_diff(&adc_chan_0_obj, &adc_obj, P10_6, CYHAL_ADC_VNEG, &channel_config);

    for (;;)
    {
    	/* Read the ADC conversion result for corresponding ADC channel. Repeat as necessary. */
		adc_out = cyhal_adc_read_uv(&adc_chan_0_obj);
		printf("ADC = %d\r\n", adc_out);
		cyhal_system_delay_ms(100);
    }
}

Build the Application

Build Application

Launching the Application

Launching

Note: Before launching the program to the board, make sure that you have already connected the board to the computer through a USB cable.

set up USB cable

Result

Once the device is set up, run the program. The microcontroller will continuously read the potentiometer's analog value, convert it to a digital signal through the ADC, and then convert that signal to millivolts using the PDL functions.

🎉 Congratulations! You can now complete Lab105

Supported toolchains (make variable 'TOOLCHAIN')

• GNU Arm® embedded compiler v10.3.1 (GCC_ARM) - Default value of TOOLCHAIN

• Arm® compiler v6.16 (ARM)

• IAR C/C++ compiler v9.30.1 (IAR)

Supported kits (make variable 'TARGET')

• PSoC™ 62S2 Wi-Fi Bluetooth® pioneer kit (CY8CKIT-062S2-43012)

• PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit (CYW9P62S1-43438EVB-01)

• PSoC™ 62S1 Wi-Fi Bluetooth® pioneer kit (CYW9P62S1-43012EVB-01)

• PSoC™ 62S3 Wi-Fi Bluetooth® prototyping kit (CY8CPROTO-062S3-4343W)

Related resources

Resources	Links
ModusToolbox™ Software Training	link

Other resources

Infineon provides a wealth of data at www.infineon.com to help you select the right device, and quickly and effectively integrate it into your design.

Document history

Document title: BILL_MTB-107 – Read potentiometer sensor value via an ADC HAL

Version	Description of change
1.0.0	Lab 107: Learn basic GPIO control with PSoC 6, using ADC read potentiometer sensor value via HAL

Authors:

• Assoc. Prof. Wiroon Sriborrirux

• Mr. Sriengchhun Chheang

• Mr. Sabol Socare

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