CalvinBackup/Embedded-Hacking
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style: enforce coding standard — headers, @brief on #define, Doxygen on statics, remove _ prefix, max 8 lines per function

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Kevin Thomas
2026-04-16 22:44:43 -04:00
parent 0833c32c94
commit 433263eac0
309 changed files with 10464 additions and 6668 deletions
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0x0008_unitialized-variables-c/0x0008_unitialized-variables-c.c
+70 -20
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@@ -1,35 +1,85 @@
/**
* @file 0x0008_unitialized-variables-c.c
* @brief Blink LED using direct register-level pad and IO bank configuration
* @author Kevin Thomas
* @date 2025
*
* MIT License
*
* Copyright (c) 2025 Kevin Thomas
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* -----------------------------------------------------------------------------
*
* Blinks an LED on GPIO16 using direct register writes to PADS_BANK0 and
* IO_BANK0 for pad configuration, plus gpioc coprocessor bit-level functions
* for output enable and data. Demonstrates the register-level equivalent of
* gpio_init / gpio_set_function.
*
* Wiring:
* GPIO16 -> LED anode (with current-limiting resistor to GND)
*/
#include <stdio.h>
#include "pico/stdlib.h"
#define LED_PIN 16
/** @brief GPIO pin number for the LED */
#define LED_PIN 16
int main(void)
{
// gpio_init(LED_PIN);
/// gpio_set_dir(LED_PIN, GPIO_IN);
/**
* @brief Configure pad and IO bank registers for GPIO16 as SIO output
*
* @details Sets PADS_BANK0 IE/OD bits, assigns FUNCSEL to SIO in IO_BANK0,
* clears the ISO bit, and enables output via the coprocessor.
*
* @retval None
*/
static void configure_pad_and_iobank(void) {
gpioc_bit_oe_put(LED_PIN, GPIO_OUT);
/// gpio_put(LED_PIN, 0);
gpioc_bit_out_put(LED_PIN, 0);
/// gpio_set_function(LED_PIN, GPIO_FUNC_SIO);
hw_write_masked(&pads_bank0_hw->io[LED_PIN],
PADS_BANK0_GPIO0_IE_BITS,
PADS_BANK0_GPIO0_IE_BITS | PADS_BANK0_GPIO0_OD_BITS
);
PADS_BANK0_GPIO0_IE_BITS | PADS_BANK0_GPIO0_OD_BITS);
io_bank0_hw->io[LED_PIN].ctrl = GPIO_FUNC_SIO << IO_BANK0_GPIO0_CTRL_FUNCSEL_LSB;
hw_clear_bits(&pads_bank0_hw->io[LED_PIN], PADS_BANK0_GPIO0_ISO_BITS);
// gpio_set_dir(LED_PIN, GPIO_OUT);
gpioc_bit_oe_put(LED_PIN, GPIO_OUT);
}
/**
* @brief Blink LED using coprocessor bit output functions
*
* @details Toggles the LED on and off with 500ms delays using
* gpioc_bit_out_put and sleep_us.
*
* @retval None
*/
static void blink_cycle(void) {
gpioc_bit_out_put(LED_PIN, 1);
sleep_us(500 * 1000ull);
gpioc_bit_out_put(LED_PIN, 0);
sleep_us(500 * 1000ull);
}
int main(void) {
configure_pad_and_iobank();
while (true) {
// gpio_put(LED_PIN, 1);
gpioc_bit_out_put(LED_PIN, 1);
// sleep_ms(500);
sleep_us(500 * 1000ull);
// gpio_put(LED_PIN, 0);
gpioc_bit_out_put(LED_PIN, 0);
// sleep_ms(500);
sleep_us(500 * 1000ull);
blink_cycle();
}
}