mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
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Kevin Thomas
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/**
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* @file 0x06_adc.c
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* @brief ADC demonstration: potentiometer voltage + on-chip temperature
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* @author Kevin Thomas
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* @date 2025
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*
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* MIT License
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*
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* Copyright (c) 2025 Kevin Thomas
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* -----------------------------------------------------------------------------
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*
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* Demonstrates 12-bit ADC using the adc driver (adc.h / adc.c). Reads
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* ADC channel 0 (GPIO 26) and reports the voltage in millivolts alongside
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* the on-chip temperature sensor reading every 500 ms over UART.
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*
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* Wiring:
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* GPIO26 -> Wiper of a 10 kohm potentiometer
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* 3.3V -> One end of the potentiometer
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* GND -> Other end of the potentiometer
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*/
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#include <stdio.h>
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#include "pico/stdlib.h"
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#include "adc.h"
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#define ADC_GPIO 26
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#define ADC_CHANNEL 0
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/**
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* @brief Read and print ADC voltage and chip temperature over UART
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*
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* Samples the ADC channel for voltage in millivolts and reads the
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* on-chip temperature sensor, then prints both values.
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*/
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static void _print_adc_readings(void) {
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uint32_t voltage_mv = adc_driver_read_mv();
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float temp_c = adc_driver_read_temp_celsius();
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printf("ADC0: %4lu mV | Chip temp: %.1f C\r\n", voltage_mv, temp_c);
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}
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/**
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* @brief Application entry point for the ADC voltage and temperature demo
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*
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* Initializes the ADC on GPIO26 channel 0 and prints readings
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* every 500 ms over UART.
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*
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* @return int Does not return
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*/
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int main(void) {
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stdio_init_all();
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adc_driver_init(ADC_GPIO, ADC_CHANNEL);
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printf("ADC driver initialized: GPIO%d (channel %d)\r\n", ADC_GPIO, ADC_CHANNEL);
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while (true) {
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_print_adc_readings();
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sleep_ms(500);
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}
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}
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