mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-20 14:54:50 +02:00
Kevin Thomas
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
/**
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* @file main.c
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* @brief I2C demonstration: scan all 7-bit addresses and report devices.
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* @author Kevin Thomas
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* @date 2026
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*
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* Demonstrates I2C bus scanning using the bare-metal I2C driver.
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* I2C1 is configured at 100 kHz on SDA=GPIO2 / SCL=GPIO3. A
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* formatted hex table of all responding device addresses is
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* printed over UART and repeated every 5 seconds.
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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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* GPIO2 -> I2C device SDA (4.7 kohm pull-up to 3.3 V)
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* GPIO3 -> I2C device SCL (4.7 kohm pull-up to 3.3 V)
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* 3.3V -> I2C device VCC
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* GND -> I2C device GND
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*
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* MIT License
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*
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* Copyright (c) 2026 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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#include "rp2350_i2c.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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/** @brief Delay between I2C bus scans in milliseconds */
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#define SCAN_DELAY_MS 5000
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int main(void)
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{
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xosc_set_clk_ref();
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i2c_release_reset();
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i2c_init();
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uart_puts("I2C driver initialized: I2C1 @ 100 kHz SDA=GPIO2 SCL=GPIO3\r\n");
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while (1)
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{
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i2c_scan();
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delay_ms(SCAN_DELAY_MS);
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}
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}
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