STM32使用Modbus协议读取温湿度
文章目录
- 前言
- 1 移植RT-Thread
-
- 1.1 CubeMX 安装Nano pack
- 1.2 CubeMX创建项目
- 2 Keil修改代码
-
- 2.1 添加文件
- 2.2 移植freeModusRTU
- 2.3 修改代码
- 3 效果展示
- 总结
前言
-
软件版本
STM32CubeMX 6.4 0
Keil 531 -
硬件
STM32F103C8T6
AHT20温湿度传感器
题目要求
用stm32最小核心板+AHT20模块，完成一个 modbus接口的温湿度Slave设备，能够让上位机PC通过modbus协议获取温湿度。主程序采用多任务框架，比如RT-thread Nano。
1 移植RT-Thread
1.1 CubeMX 安装Nano pack
官方下载参考
https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-nano/nano-port-cube/an0041-nano-port-cube
- 获取软件包地址
要获取 RT-Thread Nano 软件包，需要在 CubeMX 中添加
https://www.rt-thread.org/download/cube/RealThread.RT-Thread.pdsc - 打开
CubeMX，从菜单栏help进入Manage embedded software packages界面，点击From Url按钮，进入User Defined Packs Manager界面，其次点击new，填入上述网址，然后点击check.
- 下载安装完成后如下，前面的勾选框变为绿色
1.2 CubeMX创建项目
-
选择Nano组件
点击Softwares Packages->Select Components，进入组件配置界面
选择RealThread， 然后根3.1.5版本的，然后点击OK
这时会新增Software Packs展开就可以看见添加的RealThread.RT_Thread,勾选相应内容
-
RCC配置
-
SYS配置
-
USART1
-
NVIC选择
RT-Thread 操作系统重定义HardFault_Handler、PendSV_Handler、SysTick_Handler中断函数，为了避免重复定义的问题，在生成工程之前，需要在中断配置中，代码生成的选项中，取消选择三个中断函数 -
GPIO
选择B15作为指示灯 -
时钟配置
2 Keil修改代码
AHT20采集详细代码见之前博客
https://blog.csdn.net/apple_52030329/article/details/127854432
2.1 添加文件
在Cube生成项目的文件夹下，在MDK-ARM文件夹下建立AHT文件夹，并在该文件夹下，添加如下文件
在项目中添加文件
2.2 移植freeModusRTU
下载链接：https://github.com/cwalter-at/freemodbus
解压并打开刚刚下载的文件，点进demo里，新建一个STM32MB文件夹
将BARE文件夹里的文件全部复制到刚刚建立的STM32MB文件夹里
再把modbus文件夹全部复制到刚刚新建的STM32MB文件夹，到最后的结果如下图：
打开MDK-ARM文件夹，将STM32MB文件复制到这里
新建名为MB和MB_Port的组，MB内添加STM32MB文件夹下modbus文件夹内所有.c文件，MB_Port内添加STM32MB文件夹下port文件夹内所有.c文件以及根目录的demo.c文件：
添加头文件路径
2.3 修改代码
portserial.c
#include "port.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "usart.h"
/* ----------------------- static functions ---------------------------------*/
void prvvUARTTxReadyISR( void );
void prvvUARTRxISR( void );
/* ----------------------- Start implementation -----------------------------*/
void
vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )
{
/* If xRXEnable enable serial receive interrupts. If xTxENable enable
* transmitter empty interrupts.
*/
if (xRxEnable) //将串口收发中断和modbus联系起来，下面的串口改为自己使能的串口
{
__HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE); //我用的是串口1，故为&huart1
}
else
{
__HAL_UART_DISABLE_IT(&huart1,UART_IT_RXNE);
}
if (xTxEnable)
{
__HAL_UART_ENABLE_IT(&huart1,UART_IT_TXE);
}
else
{
__HAL_UART_DISABLE_IT(&huart1,UART_IT_TXE);
}
}
BOOL
xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
{
return TRUE;
}
BOOL
xMBPortSerialPutByte( CHAR ucByte )
{
/* Put a byte in the UARTs transmit buffer. This function is called
* by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been
* called. */
if(HAL_UART_Transmit (&huart1 ,(uint8_t *)&ucByte,1,0x01) != HAL_OK ) //添加发送一位代码
return FALSE ;
else
return TRUE;
}
BOOL
xMBPortSerialGetByte( CHAR * pucByte )
{
/* Return the byte in the UARTs receive buffer. This function is called
* by the protocol stack after pxMBFrameCBByteReceived( ) has been called.
*/
if(HAL_UART_Receive (&huart1 ,(uint8_t *)pucByte,1,0x01) != HAL_OK )//添加接收一位代码
return FALSE ;
else
return TRUE;
}
/* Create an interrupt handler for the transmit buffer empty interrupt
* (or an equivalent) for your target processor. This function should then
* call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
* a new character can be sent. The protocol stack will then call
* xMBPortSerialPutByte( ) to send the character.
*/
void prvvUARTTxReadyISR( void )
{
pxMBFrameCBTransmitterEmpty( );
}
/* Create an interrupt handler for the receive interrupt for your target
* processor. This function should then call pxMBFrameCBByteReceived( ). The
* protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
* character.
*/
void prvvUARTRxISR( void )
{
pxMBFrameCBByteReceived( );
}
porttimer.c
/*
* FreeModbus Libary: BARE Port
* Copyright (C) 2006 Christian Walter
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* File: $Id$
*/
/* ----------------------- Platform includes --------------------------------*/
#include "port.h"
#include "stm32f1xx_hal.h"
#include "tim.h"
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
/* ----------------------- static functions ---------------------------------*/
void prvvTIMERExpiredISR( void );
/* ----------------------- Start implementation -----------------------------*/
BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )//定时器初始化直接返回TRUE，已经在mian函数初始化过
{
return TRUE;
}
inline void
vMBPortTimersEnable( )//使能定时器中断，我用的是定时器4，所以为&htim4
{
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
__HAL_TIM_CLEAR_IT(&htim3,TIM_IT_UPDATE);
__HAL_TIM_ENABLE_IT(&htim3,TIM_IT_UPDATE);
__HAL_TIM_SET_COUNTER(&htim3,0);
__HAL_TIM_ENABLE(&htim3);
}
inline void
vMBPortTimersDisable( )//取消定时器中断
{
/* Disable any pending timers. */
__HAL_TIM_DISABLE(&htim3);
__HAL_TIM_SET_COUNTER(&htim3,0);
__HAL_TIM_DISABLE_IT(&htim3,TIM_IT_UPDATE);
__HAL_TIM_CLEAR_IT(&htim3,TIM_IT_UPDATE);
}
/* Create an ISR which is called whenever the timer has expired. This function
* must then call pxMBPortCBTimerExpired( ) to notify the protocol stack that
* the timer has expired.
*/
void prvvTIMERExpiredISR( void )//modbus定时器动作，需要在中断内使用
{
( void )pxMBPortCBTimerExpired( );
}
stm32f1xx_it.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file stm32f1xx_it.c
* @brief Interrupt Service Routines.
******************************************************************************
* @attention
*
* Copyright (c) 2022 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stm32f1xx_it.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */
/* USER CODE END TD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */
extern void prvvUARTTxReadyISR(void);
extern void prvvUARTRxISR(void);
extern void prvvTIMERExpiredISR( void );
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/* External variables --------------------------------------------------------*/
extern DMA_HandleTypeDef hdma_i2c1_rx;
extern DMA_HandleTypeDef hdma_i2c1_tx;
extern I2C_HandleTypeDef hi2c1;
extern TIM_HandleTypeDef htim3;
extern UART_HandleTypeDef huart1;
/* USER CODE BEGIN EV */
/* USER CODE END EV */
/******************************************************************************/
/* Cortex-M3 Processor Interruption and Exception Handlers */
/******************************************************************************/
/**
* @brief This function handles Non maskable interrupt.
*/
void NMI_Handler(void)
{
/* USER CODE BEGIN NonMaskableInt_IRQn 0 */
/* USER CODE END NonMaskableInt_IRQn 0 */
/* USER CODE BEGIN NonMaskableInt_IRQn 1 */
while (1)
{
}
/* USER CODE END NonMaskableInt_IRQn 1 */
}
/**
* @brief This function handles Memory management fault.
*/
void MemManage_Handler(void)
{
/* USER CODE BEGIN MemoryManagement_IRQn 0 */
/* USER CODE END MemoryManagement_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
/* USER CODE END W1_MemoryManagement_IRQn 0 */
}
}
/**
* @brief This function handles Prefetch fault, memory access fault.
*/
void BusFault_Handler(void)
{
/* USER CODE BEGIN BusFault_IRQn 0 */
/* USER CODE END BusFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_BusFault_IRQn 0 */
/* USER CODE END W1_BusFault_IRQn 0 */
}
}
/**
* @brief This function handles Undefined instruction or illegal state.
*/
void UsageFault_Handler(void)
{
/* USER CODE BEGIN UsageFault_IRQn 0 */
/* USER CODE END UsageFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_UsageFault_IRQn 0 */
/* USER CODE END W1_UsageFault_IRQn 0 */
}
}
/**
* @brief This function handles Debug monitor.
*/
void DebugMon_Handler(void)
{
/* USER CODE BEGIN DebugMonitor_IRQn 0 */
/* USER CODE END DebugMonitor_IRQn 0 */
/* USER CODE BEGIN DebugMonitor_IRQn 1 */
/* USER CODE END DebugMonitor_IRQn 1 */
}
/******************************************************************************/
/* STM32F1xx Peripheral Interrupt Handlers */
/* Add here the Interrupt Handlers for the used peripherals. */
/* For the available peripheral interrupt handler names, */
/* please refer to the startup file (startup_stm32f1xx.s). */
/******************************************************************************/
/**
* @brief This function handles DMA1 channel6 global interrupt.
*/
void DMA1_Channel6_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel6_IRQn 0 */
/* USER CODE END DMA1_Channel6_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_i2c1_tx);
/* USER CODE BEGIN DMA1_Channel6_IRQn 1 */
/* USER CODE END DMA1_Channel6_IRQn 1 */
}
/**
* @brief This function handles DMA1 channel7 global interrupt.
*/
void DMA1_Channel7_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel7_IRQn 0 */
/* USER CODE END DMA1_Channel7_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_i2c1_rx);
/* USER CODE BEGIN DMA1_Channel7_IRQn 1 */
/* USER CODE END DMA1_Channel7_IRQn 1 */
}
/**
* @brief This function handles TIM3 global interrupt.
*/
void TIM3_IRQHandler(void)
{
/* USER CODE BEGIN TIM3_IRQn 0 */
/* USER CODE END TIM3_IRQn 0 */
HAL_TIM_IRQHandler(&htim3);
/* USER CODE BEGIN TIM3_IRQn 1 */
/* USER CODE END TIM3_IRQn 1 */
}
/**
* @brief This function handles I2C1 event interrupt.
*/
void I2C1_EV_IRQHandler(void)
{
/* USER CODE BEGIN I2C1_EV_IRQn 0 */
/* USER CODE END I2C1_EV_IRQn 0 */
HAL_I2C_EV_IRQHandler(&hi2c1);
/* USER CODE BEGIN I2C1_EV_IRQn 1 */
/* USER CODE END I2C1_EV_IRQn 1 */
}
/**
* @brief This function handles USART1 global interrupt.
*/
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
/* USER CODE END USART1_IRQn 0 */
HAL_UART_IRQHandler(&huart1);
/* USER CODE BEGIN USART1_IRQn 1 */
if(__HAL_UART_GET_IT_SOURCE(&huart1, UART_IT_RXNE)!= RESET)
{
prvvUARTRxISR();//接收中断
}
if(__HAL_UART_GET_IT_SOURCE(&huart1, UART_IT_TXE)!= RESET)
{
prvvUARTTxReadyISR();//发送中断
}
HAL_NVIC_ClearPendingIRQ(USART1_IRQn);
HAL_UART_IRQHandler(&huart1);
/* USER CODE END USART1_IRQn 1 */
}
/* USER CODE BEGIN 1 */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim) //定时器中断回调函数，用于连接porttimer.c文件的函数
{
/* NOTE : This function Should not be modified, when the callback is needed,
the __HAL_TIM_PeriodElapsedCallback could be implemented in the user file
*/
prvvTIMERExpiredISR( );
}
/* USER CODE END 1 */
demo.c
/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "AHT20-21_DEMO_V1_3.h"
/* ----------------------- Defines ------------------------------------------*/
#define REG_INPUT_START 0
#define REG_INPUT_NREGS 5
/* ----------------------- Static variables ---------------------------------*/
static USHORT usRegInputStart = REG_INPUT_START;
//static
uint16_t usRegInputBuf[REG_INPUT_NREGS];
uint16_t InputBuff[5];
uint32_t CT_data[2]={0,0};
volatile int c1,c2,t1,t2;
eMBErrorCode
eMBRegInputCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs )
{
eMBErrorCode eStatus = MB_ENOERR;
int iRegIndex;
int i;
AHT20_Read_CTdata_crc(CT_data); //crc校验后，读取AHT20的温度和湿度数据
c1 = CT_data[0]*1000/1024/1024; //计算得到湿度值c1（放大了10倍）
t1 = CT_data[1]*2000/1024/1024-500;//计算得到温度值t1（放大了10倍）
c2 = c1/10 + (c1/10)%10;
t2 = t1/10 + (t1/10)%10;
InputBuff[0] = t2;
InputBuff[1] = c2;
InputBuff[2] = 0x01;
InputBuff[3] = 0x01;
if( ( usAddress >= REG_INPUT_START )
&& ( usAddress + usNRegs <= REG_INPUT_START + REG_INPUT_NREGS ) )
{
iRegIndex = ( int )( usAddress - usRegInputStart );
for(i=0;i<usNRegs;i++)
{
*pucRegBuffer=InputBuff[i+usAddress-1]>>8;
pucRegBuffer++;
*pucRegBuffer=InputBuff[i+usAddress-1]&0xff;
pucRegBuffer++;
}
}
else
{
eStatus = MB_ENOREG;
}
return eStatus;
}
eMBErrorCode
eMBRegHoldingCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNRegs,
eMBRegisterMode eMode )
{
return MB_ENOREG;
}
eMBErrorCode
eMBRegCoilsCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNCoils,
eMBRegisterMode eMode )
{
return MB_ENOREG;
}
eMBErrorCode
eMBRegDiscreteCB( UCHAR * pucRegBuffer, USHORT usAddress, USHORT usNDiscrete )
{
return MB_ENOREG;
}
创建任务，在Application/USER文件夹下新建app_rt_thread.c文件
添加以下代码
#include "rtthread.h"
#include "main.h"
#include "stdio.h"
#include "usart.h"
#include "AHT20-21_DEMO_V1_3.h"
#include "mb.h"
#include "mbport.h"
struct rt_thread led1_thread;
rt_uint8_t rt_led1_thread_stack[128];
void led1_task_entry(void *parameter);
//初始化线程函数
void MX_RT_Thread_Init(void)
{
//初始化LED1线程
rt_thread_init(&led1_thread,"led1",led1_task_entry,RT_NULL,&rt_led1_thread_stack[0],sizeof(rt_led1_thread_stack),3,20);
//开启线程调度
rt_thread_startup(&led1_thread);
}
//主任务
void MX_RT_Thread_Process(void)
{
( void )eMBPoll( );//启动modbus侦听
}
//LED1任务
void led1_task_entry(void *parameter)
{
while(1)
{
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_15, GPIO_PIN_RESET);
rt_thread_delay(500);
HAL_GPIO_WritePin(GPIOB,GPIO_PIN_15, GPIO_PIN_SET);
rt_thread_delay(500);
}
}
找到Middlewares/RT-Thread/RTOS/kernel文件夹下的board.c文件，修改串口USART2为USART1
找到Application/User/Core里app_rt_thread.c下的rtconfig.h
mian.c
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2022 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "dma.h"
#include "i2c.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
#include "mb.h"
#include "mbport.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include 3 效果展示
将上述代码修改好后，编译烧录。
由于疫情原因返校回家，目前手上没有AHT20传感器，等返校后效果会补上。若连接传感器后，实现效果应为使用Modbusposs接收数据可以看到温度和湿度的数值，同时作为指示灯的小灯泡会闪烁。
总结
本次实验进一步学习了解了Modbus协议的应用，同时还完成了RT-Thread的移植。
参考：
https://blog.csdn.net/weixin_46129506/article/details/121914039
https://blog.csdn.net/qq_47281915/article/details/122328414
https://blog.csdn.net/weixin_56102526/article/details/121952050