mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-24 16:34:46 +02:00
Kevin Thomas
71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/**
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* @file 0x07_i2c.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 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 I2C bus scanning using the i2c driver (i2c.h / i2c.c). I2C1
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* is configured at 100 kHz on SDA=GPIO2 / SCL=GPIO3. A formatted hex table
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* of all responding device addresses is printed over UART and repeated
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* every 5 seconds.
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*
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* Wiring:
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* GPIO2 (SDA) -> I2C device SDA (4.7 kohm pull-up to 3.3 V recommended)
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* GPIO3 (SCL) -> I2C device SCL (4.7 kohm pull-up to 3.3 V recommended)
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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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#include <stdio.h>
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#include "pico/stdlib.h"
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#include "i2c.h"
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#define I2C_PORT 1
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#define I2C_SDA_PIN 2
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#define I2C_SCL_PIN 3
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#define I2C_BAUD 100000
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/**
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* @brief Application entry point for the I2C bus scanner demo
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*
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* Initializes I2C1 at 100 kHz on SDA=GPIO2 / SCL=GPIO3 and prints
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* a formatted hex table of all responding device addresses over UART,
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* repeating every 5 seconds.
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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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i2c_driver_init(I2C_PORT, I2C_SDA_PIN, I2C_SCL_PIN, I2C_BAUD);
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printf("I2C driver initialized: I2C%d @ %d Hz SDA=GPIO%d SCL=GPIO%d\r\n",
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I2C_PORT, I2C_BAUD, I2C_SDA_PIN, I2C_SCL_PIN);
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while (true) {
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i2c_driver_scan(I2C_PORT);
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sleep_ms(5000);
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}
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}
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