Display ADC via Potentiometer on OLED

Lab 112

Lab Objective:

This lab demonstrates the process of reading a potentiometer sensor value through an Analog-to-Digital Converter (ADC) and display with OLED on a PSoC 6 microcontroller.

🔥 Requirements

Resources

Links

🚩 Let start

Create Application

Coding

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

main.c

#include "cyhal.h"
#include "cybsp.h"
#include "stdio.h"
#include "cy8ckit_028_sense.h"
#include "GUI.h"

// Define function
void lcd_print_top(const char * s);
void lcd_print_bot(const char * s);
void lcd_print_line_n(const char * s,int linenum);

cyhal_i2c_t i2c;
cyhal_i2c_cfg_t i2c_cfg = {
    .is_slave = false,
    .address = 0,
    .frequencyhal_hz = 400000
};




int main(void)
{
    cy_rslt_t result;
	cyhal_adc_t adc_obj;
	cyhal_adc_channel_t adc_chan_0_obj;
    char str[80];

    /* Initialize the device and board peripherals */
    result = cybsp_init();
    CY_ASSERT(result == CY_RSLT_SUCCESS);
    __enable_irq();

    /* Initialize i2c */
    result = cyhal_i2c_init(&i2c, CY8CKIT_028_SENSE_PIN_I2C_SDA, CY8CKIT_028_SENSE_PIN_I2C_SCL, NULL);
    CY_ASSERT(result == CY_RSLT_SUCCESS);
    result = cyhal_i2c_configure(&i2c, &i2c_cfg);
    CY_ASSERT(result == CY_RSLT_SUCCESS);

    /* Initialize the OLED display */
    result = mtb_ssd1306_init_i2c(&i2c);
    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);


    GUI_Init();

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

        sprintf(str,"Applied ES Lab");
        lcd_print_line_n(str,2);

        sprintf(str,"Lab 112 ADC read");
        lcd_print_line_n(str,4);

        lcd_print_bot("Template");
        cyhal_system_delay_ms(1000);
    }

}


 // Create function for OLED

void lcd_print_top(const char * s){
	GUI_GotoXY(0,0);
	GUI_DispString(s);
}

void lcd_print_bot(const char * s){
	GUI_GotoXY(0,50);
	GUI_DispString(s);
}

void lcd_print_line_n(const char * s,int linenum){ //linenum is 1-6
	int line = (linenum-1)*10;
	GUI_GotoXY(0,line);
	GUI_DispString(s);
}

Build the Application

Launching the Application

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

Result

🎉 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)

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.