openharmony1.1.3 通过i2c进行温湿度采集

温湿度传感器 也是挂载这个i2c总线上初始化读数据写数据1.1.3 版本的i2c底层接口默认 系统没有开启i2c# CONFIG_I2C_SUPPORT is not setCONFIG_I2C_SUPPORT y开启i2c写一套通过i2c 读写温湿度的文件aht20.h:#ifndef AHT20_H #define AHT20_H #include stdbool.h // 提供 bool 类型 #include iot_errno.h // 提供 IOT_SUCCESS/IOT_FAILURE #include stdint.h unsigned int AHT20_Init(void); unsigned int AHT20_Calibrate(void); unsigned int AHT20_SoftReset(void); unsigned int AHT20_GetMeasureResult(float* temp, float* humi); #endif // AHT20_Haht20.c:/* * Copyright (C) 2021 HiHope Open Source Organization . * Licensed under the Apache License, Version 2.0 (the License); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an AS IS BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include aht20.h #include stdio.h #include string.h // OpenHarmony HAL层I2C头文件替换原海思私有头文件 #include iot_i2c.h // 延时函数头文件 #include hi_time.h // 传感器硬件参数 #define AHT20_I2C_IDX 0 // OpenHarmony标准I2C总线索引 // 传感器命令定义 #define AHT20_INIT_CMD 0xBE // 初始化命令 #define AHT20_CALIBRATE_CMD 0xBA // 校准命令 #define AHT20_MEASURE_CMD 0xAC // 测量命令 #define AHT20_SOFT_RESET_CMD 0xBA // 软复位命令 #define AHT20_STARTUP_TIME 20*1000 // 上电启动时间 #define AHT20_CALIBRATION_TIME 40*1000 // 初始化校准时间 #define AHT20_MEASURE_TIME 75*1000 // 测量时间 #define AHT20_DEVICE_ADDR 0x38 #define AHT20_READ_ADDR ((0x381)|0x1) #define AHT20_WRITE_ADDR ((0x381)|0x0) #define AHT20_CMD_CALIBRATION 0xBE // 初始化校准命令 #define AHT20_CMD_CALIBRATION_ARG0 0x08 #define AHT20_CMD_CALIBRATION_ARG1 0x00 /** * 传感器在采集时需要时间,主机发出测量指令0xAC后延时75毫秒以上再读取转换后的数据并判断返回的状态位是否正常。 * 若状态比特位[Bit7]为0代表数据可正常读取为1时传感器为忙状态主机需要等待数据处理完成。 **/ #define AHT20_CMD_TRIGGER 0xAC // 触发测量命令 #define AHT20_CMD_TRIGGER_ARG0 0x33 #define AHT20_CMD_TRIGGER_ARG1 0x00 // 用于在无需关闭和再次打开电源的情况下重新启动传感器系统软复位所需时间不超过20 毫秒 #define AHT20_CMD_RESET 0xBA // 软复位命令 #define AHT20_CMD_STATUS 0x71 // 获取状态命令 /** * STATUS 命令回复 * 1. 初始化后触发测量之前STATUS 只回复 1B 状态值 * 2. 触发测量之后STATUS 回复6B 1B 状态值 2B 湿度 4b湿度 4b温度 2B 温度 * RH Srh / 2^20 * 100% * T St / 2^20 * 200 - 50 **/ #define AHT20_STATUS_BUSY_SHIFT 7 // bit[7] Busy indication #define AHT20_STATUS_BUSY_MASK (0x1AHT20_STATUS_BUSY_SHIFT) #define AHT20_STATUS_BUSY(status) ((status AHT20_STATUS_BUSY_MASK) AHT20_STATUS_BUSY_SHIFT) #define AHT20_STATUS_MODE_SHIFT 5 // bit[6:5] Mode Status #define AHT20_STATUS_MODE_MASK (0x3AHT20_STATUS_MODE_SHIFT) #define AHT20_STATUS_MODE(status) ((status AHT20_STATUS_MODE_MASK) AHT20_STATUS_MODE_SHIFT) // bit[4] Reserved #define AHT20_STATUS_CALI_SHIFT 3 // bit[3] CAL Enable #define AHT20_STATUS_CALI_MASK (0x1AHT20_STATUS_CALI_SHIFT) #define AHT20_STATUS_CALI(status) ((status AHT20_STATUS_CALI_MASK) AHT20_STATUS_CALI_SHIFT) // bit[2:0] Reserved #define AHT20_STATUS_RESPONSE_MAX 6 #define AHT20_RESOLUTION (120) // 2^20 #define AHT20_MAX_RETRY 10 // 全局变量标记传感器是否初始化完成 static bool g_aht20Initialized false; /** * brief 内部函数I2C读取数据调用OpenHarmony HAL层接口 */ static unsigned int AHT20_I2C_Read(uint8_t* buffer, uint32_t buffLen) { if (buffer NULL || buffLen 0) { return IOT_FAILURE; } // 调用HAL层I2C读函数 return IoTI2cRead(AHT20_I2C_IDX, AHT20_READ_ADDR, buffer, buffLen); } /** * brief 内部函数I2C写入数据调用OpenHarmony HAL层接口 */ static unsigned int AHT20_I2C_Write(uint8_t* buffer, uint32_t buffLen) { if (buffer NULL || buffLen 0) { return IOT_FAILURE; } // 调用HAL层I2C写函数 return IoTI2cWrite(AHT20_I2C_IDX, AHT20_WRITE_ADDR, buffer, buffLen); } /** * brief 软件复位AHT20 */ unsigned int AHT20_SoftReset(void) { uint8_t resetCmd AHT20_SOFT_RESET_CMD; unsigned int retval AHT20_I2C_Write(resetCmd, 1); hi_udelay(20000); // 复位后等待20ms if (retval ! IOT_SUCCESS) { printf(AHT20 soft reset failed, err: %u\n, retval); return retval; } return IOT_SUCCESS; } /** * brief 校准AHT20 */ unsigned int AHT20_Calibrate(void) { uint8_t calCmd[3] {AHT20_CALIBRATE_CMD, 0x00, 0x00}; unsigned int retval AHT20_I2C_Write(calCmd, 3); hi_udelay(30000); // 校准等待30ms if (retval ! IOT_SUCCESS) { printf(AHT20 calibrate failed, err: %u\n, retval); return retval; } return IOT_SUCCESS; } /** * brief 初始化AHT20 */ unsigned int AHT20_Init(void) { uint8_t initCmd[3] {AHT20_INIT_CMD, 0x08, 0x00}; unsigned int retval 0; // 1. 软复位传感器 retval AHT20_SoftReset(); if (retval ! IOT_SUCCESS) { return retval; } // 2. 发送初始化命令 hi_udelay(40000); // 复位后等待40ms retval AHT20_I2C_Write(initCmd, 3); if (retval ! IOT_SUCCESS) { printf(AHT20 init cmd failed, err: %u\n, retval); return retval; } // 3. 标记初始化完成 g_aht20Initialized true; return IOT_SUCCESS; } /** * brief 获取温湿度测量结果 * param temp 温度结果指针单位℃ * param humi 湿度结果指针单位%RH * return 成功返回IOT_SUCCESS失败返回对应错误码 */ unsigned int AHT20_GetMeasureResult(float* temp, float* humi) { // 参数合法性检查 if (temp NULL || humi NULL) { return IOT_FAILURE; } if (!g_aht20Initialized) { printf(AHT20 not initialized!\n); return IOT_FAILURE; } uint8_t measureCmd[3] {AHT20_MEASURE_CMD, 0x33, 0x00}; uint8_t dataBuf[6] {0}; unsigned int retval 0; // 1. 发送测量命令 retval AHT20_I2C_Write(measureCmd, 3); if (retval ! IOT_SUCCESS) { printf(AHT20 measure cmd failed, err: %u\n, retval); return retval; } // 2. 等待测量完成最大80ms hi_udelay(80000); // 3. 读取测量数据 retval AHT20_I2C_Read(dataBuf, 6); if (retval ! IOT_SUCCESS) { printf(AHT20 read data failed, err: %u\n, retval); return retval; } // 4. 解析测量状态 if ((dataBuf[0] 0x80) ! 0) { printf(AHT20 measure not ready!\n); return IOT_FAILURE; } // 5. 计算温湿度 uint32_t humiRaw ((uint32_t)dataBuf[1] 12) | ((uint32_t)dataBuf[2] 4) | ((dataBuf[3] 0xF0) 4); *humi (humiRaw / 1048576.0f) * 100.0f; uint32_t tempRaw ((uint32_t)(dataBuf[3] 0x0F) 16) | ((uint32_t)dataBuf[4] 8) | dataBuf[5]; *temp (tempRaw / 1048576.0f) * 200.0f - 50.0f; return IOT_SUCCESS; }#define AHT20_I2C_IDX 0 // OpenHarmony标准I2C总线索引hi3861 就一条总线AHT20第地址#define AHT20_DEVICE_ADDR 0x38#define AHT20_READ_ADDR ((0x381)|0x1)#define AHT20_WRITE_ADDR ((0x381)|0x0)通I2C读写的方法这个是1.1.3 当中的方法 具体看i2c头文件的描述/*** brief 内部函数I2C读取数据调用OpenHarmony HAL层接口*/static unsigned int AHT20_I2C_Read(uint8_t* buffer, uint32_t buffLen) {if (buffer NULL || buffLen 0) {return IOT_FAILURE;}// 调用HAL层I2C读函数return IoTI2cRead(AHT20_I2C_IDX, AHT20_READ_ADDR, buffer, buffLen);}/*** brief 内部函数I2C写入数据调用OpenHarmony HAL层接口*/static unsigned int AHT20_I2C_Write(uint8_t* buffer, uint32_t buffLen) {if (buffer NULL || buffLen 0) {return IOT_FAILURE;}// 调用HAL层I2C写函数return IoTI2cWrite(AHT20_I2C_IDX, AHT20_WRITE_ADDR, buffer, buffLen);}第一个最底层BUILD.gnimport(//build/lite/config/component/lite_component.gni) lite_component(iothardware) { features [ :aht20, # ] } static_library(aht20) { sources [ aht20.c, ] include_dirs [ //utils/native/lite/include, //kernel/liteos_m/components/cmsis/2.0, //base/iot_hardware/interfaces/kits/wifiiot_lite, //base/iot_hardware/peripheral/interfaces/kits, ] }在 ~/openharmony3/1.1.3/applications/sample/wifi-iot/app下 新建目录aht20_test目录下放2个文件 aht20_test.c 与BUILD.gn。 这里 aht20_test.c 就是根据厂家文档的 test 目录下的那个.c文件进行的修改aht20_test.c 与BUILD.gnaht20_test.c/* * Copyright (C) 2021 HiHope Open Source Organization . * Licensed under the Apache License, Version 2.0 (the License); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an AS IS BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include aht20.h // 引入驱动头文件 #include stdio.h #include unistd.h // OpenHarmony系统头文件使用HAL层接口替代海思私有头文件 #include ohos_init.h #include cmsis_os2.h #include hi_gpio.h #include hi_io.h #include iot_i2c.h // HAL层I2C接口头文件 #include iot_errno.h // HAL层错误码定义 // 任务函数循环采集温湿度 void Aht20TestTask(void* arg) { (void)arg; // 消除未使用参数警告 unsigned int retval 0; // 错误码类型统一为unsigned int匹配HAL层 float temp 0.0f, humi 0.0f; // 步骤1配置GPIO13/GPIO14为I2C0功能Hi3861默认I2C0引脚 hi_io_set_func(HI_IO_NAME_GPIO_13, HI_IO_FUNC_GPIO_13_I2C0_SDA); // SDA引脚 hi_io_set_func(HI_IO_NAME_GPIO_14, HI_IO_FUNC_GPIO_14_I2C0_SCL); // SCL引脚 // 步骤2初始化I2C0使用HAL层接口波特率400kHz retval IoTI2cInit(0, 400 * 1000); // 替换为HAL层初始化函数 if (retval ! IOT_SUCCESS) { // 使用HAL层错误码IOT_SUCCESS printf(I2C0 init failed, err: %u\n, retval); return; } // 步骤3初始化AHT20传感器 retval AHT20_Init(); if (retval ! IOT_SUCCESS) { // 与驱动中错误码统一 printf(AHT20 init failed, err: %u\n, retval); return; } printf(AHT20 init success!\n); // 步骤4循环采集并打印数据1秒/次 while (1) { retval AHT20_GetMeasureResult(temp, humi); if (retval IOT_SUCCESS) { printf(AHT20: Temp %.2f℃, Humi %.2f%%RH\n, temp, humi); } else { printf(AHT20 read failed, err: %u\n, retval); } sleep(1); // 延时1秒 } } // 任务创建函数注册为OpenHarmony启动项 void Aht20Test(void) { osThreadAttr_t taskAttr; // CMSIS-OS2任务属性结构体 // 配置任务属性 taskAttr.name Aht20TestTask; // 任务名称 taskAttr.attr_bits 0U; // 任务属性默认0 taskAttr.cb_mem NULL; // 回调函数内存无 taskAttr.cb_size 0U; // 回调函数内存大小无 taskAttr.stack_mem NULL; // 任务栈内存使用系统分配 taskAttr.stack_size 4096; // 任务栈大小4KB taskAttr.priority osPriorityNormal; // 任务优先级正常 // 创建任务 if (osThreadNew(Aht20TestTask, NULL, taskAttr) NULL) { printf(Create Aht20TestTask failed!\n); } } // 注册任务系统启动时自动执行Aht20Test APP_FEATURE_INIT(Aht20Test);BUILD.gn:static_library(aht20_test) { sources [ aht20_test.c, ] include_dirs [ /home/dragon/openharmony/1.1.3/applications/sample/wifi-iot/app/iothardware, //utils/native/lite/include, //kernel/liteos_m/kal, //base/iot_hardware/peripheral/interfaces/kits, ] deps [ /home/dragon/openharmony/1.1.3/applications/sample/wifi-iot/app/iothardware:aht20, ] }第5步修改app 下的 BUILD.gnimport(//build/lite/config/component/lite_component.gni) lite_component(app) { features [ aht20_test:aht20_test, ] }