Renesas R7FA8D1BH (Cortex®-M85)和蓝牙模块通信

目录

概述

1 软硬件

1.1 软硬件环境信息

1.2 开发板信息

1.3 调试器信息

2 硬件架构

2.1 系统架构

2.2 蓝牙模块介绍 

3 软件实现

3.1 FSP配置参数

3.2 代码实现

3.2.1 驱动函数

3.2.2 功能函数

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概述

本文主要介绍Renesas R7FA8D1BH (Cortex®-M85)和蓝牙模块通信的实现方法，具体内容包括整个系统的架构，蓝牙模块功能介绍，FSP配置参数的方法，蓝牙模块驱动代码，功能代码。

1 软硬件

1.1 软硬件环境信息

软硬件信息	版本信息
Renesas MCU	R7FA8D1BH
Keil	MDK ARM 5.38
FSP 版本	5.3.0
调试工具：N32G45XVL-STB	DAP-LINK

1.2 开发板信息

笔者选择使用野火耀阳开发板_瑞萨RA8，该板块的主控MCU为R7FA8D1BHECBD，7FA8D1BHECBD的内核为ARM Contex-M85。

1.3 调试器信息

对于R7FA8D1BHECBD芯片，其使用的内核为Cortex®-M85 Core, ST-LINK-V2或者J-LINK-V9不支持下载和调试功能。笔者经过多次尝试，发现N32G45XVL-STB板卡上自带的DAP-LINK可以下载和调试R7FA8D1BHECBD。

下图为N32G45XVL-STB开发板实物图：

2 硬件架构

2.1 系统架构

系统功能介绍：

1）使用4路PWM控制小车的四个轮子转动，并且控制小车的运行方向

2）蓝牙模块通过UART接口和MCU通信

2.2 蓝牙模块介绍 

 HC-08蓝牙串口通信模块是新一代的基于Bluetooth Specification V4.0 BLE 蓝牙协议的数传模块。无线工作频段为 2.4GHz ISM，调制方式是 GFSK。模块最大发射功率为4dBm，接收灵敏度-93dBm，空旷环境下和 手机可以实现 80 米超远距离通信。其和MCU之间通过串口通信，软件设计也简单便捷，且不需要考虑蓝牙协议栈问题，非常适合做速成产品。

蓝牙模块与MCU之间连接图：

3 软件实现

3.1 FSP配置参数

1）蓝牙模块通信接口配置

配置IO参数

配置通信参数

3.2 代码实现

3.2.1 驱动函数

在3.1步骤中完成参数配置之后，就可以生成配置代码，编写功能代码。

1）初始化函数和数据发送函数

2）字符串发送函数

 

3）配置baud函数

 4）接收中断回调函数

源代码文件：

 /*FILE NAME  :  bluetooth.cDescription:  user bluetooth interface Author     :  tangmingfei2013@126.comDate       :  2024/09/15*/
#include "bsp_uart.h"
#include "bluetooth.h" 
#include "hal_data.h"
#include "app_bluetooth.h"#define TRANSFER_LENGTH       128static uint8_t  g_out_of_band_received[TRANSFER_LENGTH];
static uint32_t g_transfer_complete = 0;
static uint32_t g_receive_complete  = 0;
static uint32_t g_out_of_band_index = 0;static void r_sci_b_uart1_set_baud (uint32_t baud_rate);
void r_sci_b_uart1_sendArry ( uint8_t *str, uint32_t len);void blueTooth_Init( void )
{r_sci_b_uart1_set_baud( SCI_B_UART_BAUDRATE_9600 );
}void blueTooth_send( void )
{static int sec;rtc_time_t get_time;user_get_currentRtc(&get_time);if( get_time.tm_sec != sec  ){sec = get_time.tm_sec;r_sci_b_uart1_sendArry(g_out_of_band_received,TRANSFER_LENGTH );}
}void r_sci_b_uart1_sendArry ( uint8_t *str, uint32_t len)
{fsp_err_t err;// send the messsage inforerr = R_SCI_B_UART_Write(&g_uart1_ctrl,str, len);assert(FSP_SUCCESS == err);while (!g_transfer_complete){R_BSP_SoftwareDelay(1, BSP_DELAY_UNITS_MICROSECONDS);}g_transfer_complete = 0;
}static void r_sci_b_uart1_set_baud (uint32_t baud_rate)
{fsp_err_t err ;sci_b_baud_setting_t baud_setting;bool                 enable_bitrate_modulation = false;uint32_t             error_rate_x_1000         = SCI_B_UART_BAUDRATE_ERROR_PERCENT_5;err = R_SCI_B_UART_BaudCalculate(baud_rate, enable_bitrate_modulation, error_rate_x_1000, &baud_setting);assert(FSP_SUCCESS == err);err = R_SCI_B_UART_BaudSet(&g_uart1_ctrl, (void *) &baud_setting);assert(FSP_SUCCESS == err);/* Open the transfer instance with initial configuration. */err = R_SCI_B_UART_Open(&g_uart1_ctrl, &g_uart1_cfg);assert(FSP_SUCCESS == err);}void g_uart1_Callback (uart_callback_args_t * p_args)
{/* Handle the UART event */switch (p_args->event){/* Received a character */case UART_EVENT_RX_CHAR:{/* Only put the next character in the receive buffer if there is space for it */if (g_out_of_band_index < TRANSFER_LENGTH){/* Write either the next one or two bytes depending on the receive data size */if (UART_DATA_BITS_8 >= g_uart1_cfg.data_bits){g_out_of_band_received[g_out_of_band_index] = (uint8_t) p_args->data;g_out_of_band_index++;bluetoothCmd_DataRecvByte( (uint8_t) p_args->data );}else{uint16_t * p_dest = (uint16_t *) &g_out_of_band_received[g_out_of_band_index];*p_dest              = (uint16_t) p_args->data;g_out_of_band_index += 2;}}else{g_out_of_band_index = 0;}break;}/* Receive complete */case UART_EVENT_RX_COMPLETE:{g_receive_complete = 1;break;}/* Transmit complete */case UART_EVENT_TX_COMPLETE:{g_transfer_complete = 1;break;}default:{}}
}/* End of this file */

3.2.2 功能函数

1） 蓝牙模块接收数据函数

2）发送数据接口

 

3）发送log函数

 源代码文件：

 /*FILE NAME  :  app_bluetooth.cDescription:  app UIAuthor     :  tangmingfei2013@126.comDate       :  2024/06/03*/
#include "app_bluetooth.h"
#include "app_main.h" 
#include "bluetooth.h" #define PROT_FRAME_LEN       16Stru_BlueCmd stru_BlueCmd;static uint8_t recv_buf[PROT_FRAME_LEN];
static uint8_t rev_cnt = 0;void bluetoothCmd_DataRecvByte(uint8_t data )
{recv_buf[rev_cnt++] =  data;if( rev_cnt >= PROT_FRAME_LEN)rev_cnt = 0;// bluetooth commandstru_BlueCmd.recStatus +=1;if( stru_BlueCmd.recStatus > PROT_FRAME_LEN )stru_BlueCmd.recStatus = 0;if( rev_cnt >= 2 ){rev_cnt = 0;stru_BlueCmd.mcmd = recv_buf[0];stru_BlueCmd.mode = recv_buf[1];}
}static void SendInterface(uint8_t* pu8_buf, uint16_t u16_len )
{r_sci_b_uart1_sendArry(pu8_buf, u16_len);
}static void bluetooth_sendString( uint8_t *ss )
{uint8_t buff[2];uint8_t index = 0;while ( ss[index]!='\0' ){buff[0]= ss[index];SendInterface(buff, 1);index++;}
}void bluetooth_sengLog( void )
{static uint8_t step = 0;Struc_SensorPack *pSensorData;uint8_t dataBuff[128];pSensorData = &stru_SensorData;switch( step ){default:case 0:memset((char*)dataBuff, '\0', sizeof(dataBuff));//sprintf((char*)dataBuff, "log:%d,%.2f,", pSensorData->luxValue,pSensorData->sr_value);// bluetooth_sendString( dataBuff );step = 1;break;case 1://memset((char*)dataBuff, '\0', sizeof(dataBuff));sprintf((char*)dataBuff, "log:%.2f,%.2f,%d,%.2f:end", pSensorData->temperature*0.01, pSensorData->humidity*0.01, pSensorData->luxValue,pSensorData->mcuTemp_value*0.01);bluetooth_sendString( dataBuff );step = 0;break;}
}/* End of this file */