mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-07-19 02:17:34 +02:00
Kevin Thomas
c46bcba401
Public function docstrings belong exclusively in .h headers per coding convention. Only static helper functions and static variables retain docstrings in .c files. Removed 413 duplicate docstrings across 185 files (15 CBM + 15 C SDK projects). All 30 projects rebuild with zero errors.
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/**
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******************************************************************************
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* @file main.c
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* @author Kevin Thomas
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* @brief ADC demonstration: potentiometer voltage and chip temperature.
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*
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* Demonstrates 12-bit ADC using the bare-metal ADC driver. Reads
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* ADC channel 0 (GPIO26) and reports the voltage in millivolts
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* alongside the on-chip temperature sensor reading every 500 ms
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* over UART.
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*
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* Wiring:
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* GPIO0 -> UART TX (USB-to-UART adapter RX)
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* GPIO1 -> UART RX (USB-to-UART adapter TX)
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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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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_adc.h"
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#include "rp2350_uart.h"
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#include "rp2350_xosc.h"
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#include "rp2350_delay.h"
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#define SAMPLE_DELAY_MS 500
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/**
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* @brief Reverse a character buffer in place.
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* @param buf pointer to the buffer
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* @param len number of characters to reverse
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* @retval None
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*/
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static void _reverse(char *buf, uint8_t len)
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{
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for (uint8_t i = 0; i < len / 2; i++) {
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char tmp = buf[i];
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buf[i] = buf[len - 1 - i];
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buf[len - 1 - i] = tmp;
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}
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}
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/**
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* @brief Print an unsigned 32-bit integer as a decimal string over UART.
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* @param val value to print
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* @retval None
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*/
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static void _print_uint32(uint32_t val)
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{
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char buf[11];
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uint8_t len = 0;
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do { buf[len++] = (char)('0' + val % 10); val /= 10; } while (val > 0);
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_reverse(buf, len);
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buf[len] = '\0';
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uart_puts(buf);
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}
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/**
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* @brief Print a signed temperature in tenths of degrees as XX.X over UART.
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* @param tenths temperature in tenths of degrees Celsius
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* @retval None
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*/
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static void _print_temp(int32_t tenths)
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{
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if (tenths < 0) { uart_puts("-"); tenths = -tenths; }
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_print_uint32((uint32_t)(tenths / 10));
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char frac[2] = { (char)('0' + tenths % 10), '\0' };
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uart_puts(".");
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uart_puts(frac);
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}
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/**
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* @brief Print ADC voltage and chip temperature readings over UART.
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* @retval None
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*/
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static void _print_readings(void)
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{
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uint32_t mv = adc_read_mv();
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int32_t temp = adc_read_temp_tenths();
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uart_puts("ADC0: ");
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_print_uint32(mv);
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uart_puts(" mV | Chip temp: ");
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_print_temp(temp);
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uart_puts(" C\r\n");
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}
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int main(void)
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{
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xosc_enable_adc_clk();
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adc_release_reset();
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adc_init();
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while (1) {
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_print_readings();
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delay_ms(SAMPLE_DELAY_MS);
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}
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}
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