8 changed files with 273 additions and 8 deletions
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/*
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* Copyright (c) 2025, Your Name |
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* |
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* SPDX-License-Identifier: Apache-2.0 |
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* |
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* Change Logs: |
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* Date Author Notes |
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* 2025-12-27 Developer First version for ADS1115 on RT-Thread |
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*/ |
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#include <rtthread.h> |
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#include <rtdevice.h> |
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#include <board.h> |
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#include "Variable.h" |
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#define DBG_TAG "sensor.ads1115" |
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#define DBG_LVL DBG_LOG |
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#include <rtdbg.h> |
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/* ADS1115 I2C 地址（A0 引脚接地时为 0x48） */ |
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#define ADS1115_I2C_ADDR 0x48 |
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/* 使用的 I2C 总线设备名 */ |
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#define ADS1115_I2C_BUS_NAME "i2c2" // 根据你的板子修改，如 "i2c1"
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/* ADS1115 寄存器地址 */ |
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#define ADS1115_REG_CONVERT 0x00 |
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#define ADS1115_REG_CONFIG 0x01 |
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static struct rt_i2c_bus_device *i2c_bus = RT_NULL; |
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/**
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* 向 ADS1115 写入配置寄存器 |
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*/ |
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static rt_err_t ads1115_write_config(rt_uint16_t config) |
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{ |
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rt_uint8_t buf[3] = { |
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ADS1115_REG_CONFIG, |
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(rt_uint8_t)(config >> 8), |
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(rt_uint8_t)(config & 0xFF) |
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}; |
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struct rt_i2c_msg msgs[1] = { |
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{ |
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.addr = ADS1115_I2C_ADDR, |
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.flags = RT_I2C_WR, |
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.buf = buf, |
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.len = 3, |
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} |
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}; |
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if (rt_i2c_transfer(i2c_bus, msgs, 1) != 1) |
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{ |
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LOG_E("Failed to write config register."); |
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return -RT_ERROR; |
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} |
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return RT_EOK; |
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} |
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/**
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* 从 ADS1115 读取转换结果 |
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*/ |
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static rt_err_t ads1115_read_conversion(rt_int16_t *value) |
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{ |
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rt_uint8_t buf[2] = {0}; |
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struct rt_i2c_msg msgs[2] = { |
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{ |
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.addr = ADS1115_I2C_ADDR, |
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.flags = RT_I2C_WR, |
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.buf = (rt_uint8_t[]){ADS1115_REG_CONVERT}, |
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.len = 1, |
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}, |
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{ |
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.addr = ADS1115_I2C_ADDR, |
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.flags = RT_I2C_RD, |
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.buf = buf, |
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.len = 2, |
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} |
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}; |
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if (rt_i2c_transfer(i2c_bus, msgs, 2) != 2) |
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{ |
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LOG_E("Failed to read conversion register."); |
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return -RT_ERROR; |
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} |
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*value = (rt_int16_t)((buf[0] << 8) | buf[1]); |
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return RT_EOK; |
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} |
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/**
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* 读取指定通道的 ADC 值（单端输入） |
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* channel: 0 ~ 3 (对应 AIN0~AIN3 对 GND) |
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* 返回：RT_EOK 或错误码 |
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*/ |
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static rt_err_t ads1115_read_channel(rt_uint8_t channel, rt_int16_t *raw_value) |
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{ |
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if (channel > 3) |
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{ |
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LOG_E("Invalid channel: %d", channel); |
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return -RT_EINVAL; |
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} |
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// 配置：OS=1, MUX=100+ch (单端), PGA=001 (±4.096V), MODE=1 (single), DR=100 (128SPS)
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rt_uint16_t config = 0x8000 | // OS = 1
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((0x04 | channel) << 12) | // MUX: AINx vs GND
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(0x01 << 9) | // PGA = ±4.096V
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(0x01 << 8) | // MODE = single-shot
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(0x04 << 5); // DR = 128 SPS
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if (ads1115_write_config(config) != RT_EOK) |
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{ |
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return -RT_ERROR; |
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} |
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rt_thread_mdelay(10); // 等待转换完成（128SPS ≈ 8ms）
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return ads1115_read_conversion(raw_value); |
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} |
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/**
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* 将原始 ADC 值转换为毫伏（mV） |
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* 假设使用 ±2.048V 量程（PGA=1），则 LSB = 2.048V / 32768 ≈ 0.0625 mV/LSB |
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* 但因为是单端且参考地，实际范围 0~2.048V → 满量程 2.048V = 32768 LSB |
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* 所以：Voltage(mV) = raw * (2048 / 32768) = raw * 0.0625 |
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*/ |
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static rt_int32_t ads1115_raw_to_mv(rt_int16_t raw) |
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{ |
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/* 注意：单端模式下，raw 应为正数（0 ~ 32767）*/ |
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return (rt_int32_t)(((rt_int64_t)raw * 125) / 1000); // 等价于 raw * 0.0625 * 1000
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} |
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/**
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* ADS1115 读取线程（示例：读取 AIN0） |
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*/ |
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static void ads1115_thread_entry(void *parameter) |
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{ |
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rt_int16_t raw = 0 ,mt = 3600; |
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while (1) |
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{ |
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if(mt>3600) |
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{ |
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if (ads1115_read_channel(0, &raw) == RT_EOK) |
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{ |
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pow_bat = ads1115_raw_to_mv(raw); |
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} |
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else |
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{ |
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LOG_E("Failed to read ADS1115 P_BAT"); |
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} |
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} |
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else |
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{ |
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mt = 0; |
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} |
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if (ads1115_read_channel(1, &raw) == RT_EOK) |
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{ |
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pow_code = ads1115_raw_to_mv(raw); |
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} |
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else |
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{ |
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LOG_E("Failed to read ADS1115 P_CODE"); |
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} |
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if (ads1115_read_channel(2, &raw) == RT_EOK) |
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{ |
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pow_dev1 = ads1115_raw_to_mv(raw); |
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} |
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else |
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{ |
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LOG_E("Failed to read ADS1115 P_DEV1"); |
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} |
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if (ads1115_read_channel(3, &raw) == RT_EOK) |
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{ |
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pow_dev2 = ads1115_raw_to_mv(raw); |
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} |
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else |
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{ |
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LOG_E("Failed to read ADS1115 P_DEV2"); |
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} |
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rt_thread_mdelay(1000); // 每 秒读取一次
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} |
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} |
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/**
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* ADS1115 驱动初始化函数 |
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*/ |
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static int rt_hw_ads1115_init(void) |
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{ |
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i2c_bus = rt_i2c_bus_device_find(ADS1115_I2C_BUS_NAME); |
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if (i2c_bus == RT_NULL) |
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{ |
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LOG_E("Failed to find I2C bus: %s", ADS1115_I2C_BUS_NAME); |
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return -RT_ENOSYS; |
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} |
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LOG_I("Found I2C bus: %s", ADS1115_I2C_BUS_NAME); |
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/* 创建读取线程 */ |
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rt_thread_t tid = rt_thread_create("ads1115", |
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ads1115_thread_entry, |
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RT_NULL, |
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512, |
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RT_THREAD_PRIORITY_MAX - 2, |
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10); |
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if (tid != RT_NULL) |
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{ |
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rt_thread_startup(tid); |
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} |
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else |
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{ |
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LOG_E("Failed to create ADS1115 thread."); |
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return -RT_ERROR; |
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} |
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return RT_EOK; |
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} |
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/* 自动初始化 */ |
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INIT_APP_EXPORT(rt_hw_ads1115_init); |
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