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
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.c
Description: user bluetooth interface
Author : tangmingfei2013@126.com
Date : 2024/09/15
*/
#include "bsp_uart.h"
#include "bluetooth.h"
#include "hal_data.h"
#include "app_bluetooth.h"
#define TRANSFER_LENGTH 128
static 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 infor
err = 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.c
Description: app UI
Author : tangmingfei2013@126.com
Date : 2024/06/03
*/
#include "app_bluetooth.h"
#include "app_main.h"
#include "bluetooth.h"
#define PROT_FRAME_LEN 16
Stru_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 command
stru_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 */
