STM32 驱动无线NRF24L01 完成串口数据传输

/*******************************************************************************
* Function Name : USART2_IRQHandler
* Description : This function handles USART2 global interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
extern u16 Uart2_Get_Flag;
extern u8 Uart2_Get_Data;
extern u8 TX_BUF[256];
void USART2_IRQHandler(void)
{
//接收中断
if(USART_GetITStatus(USART2,USART_IT_RXNE)==SET)
{
Timer2=500;//500MS后nfr2401发送
USART_ClearITPendingBit(USART2,USART_IT_RXNE);
TX_BUF[Uart2_Get_Flag]=USART_ReceiveData(USART2);
Uart2_Get_Flag++;
//USART2_Puts(TX_BUF);
}

//溢出-如果发生溢出需要先读SR,再读DR寄存器 则可清除不断入中断的问题
if(USART_GetFlagStatus(USART2,USART_FLAG_ORE)==SET)
{
USART_ClearFlag(USART2,USART_FLAG_ORE);//读SR
USART_ReceiveData(USART2);//读DR
}
}

在 外部中断中 可以一次传输最少要两次 第一次RX_NU==1 用来接收此次传输的数据长度 用来截取有效串长，第二次RX_NU==2 就收数据放到数组里 若是数据长于32个字节就分多次传输。其中引入 超时机制 若是200/500 MS 后传输还没完成（RX_NU再次 等于1）就放弃接收数据 直接接收再次新的串长度。这个机制很重要但还有待完善。

串口中也一样500MS 还没新的数据进来就说明串口接收完成 之后就发送数据。Uart2_Get_Flag 当然就是串长了。

NRF24L01 可以参考其数据手册 都是中文好说好说~~这里就不提了。

#ifndef _API_DEF_
#define _API_DEF_

// Define interface to nRF24L01

//* Define SPI pins
/*sbit CE = P1^0; // Chip Enable pin signal (output)
sbit CSN = P1^1; // Slave Select pin, (output to CSN, nRF24L01)
sbit IRQ = P1^3; // Interrupt signal, from nRF24L01 (input)
sbit MISO = P1^4; // Master In, Slave Out pin (input)
sbit MOSI = P1^5; // Serial Clock pin, (output)
sbit SCK = P1^7; // Master Out, Slave In pin (output)
*/

// SPI(nRF24L01) commands
#define RF_READ_REG 0x00 // Define read command to register
#define RF_WRITE_REG 0x20 // Define write command to register
#define RD_RX_PLOAD 0x61 // Define RX payload register address
#define WR_TX_PLOAD 0xA0 // Define TX payload register address
#define FLUSH_TX 0xE1 // Define flush TX register command
#define FLUSH_RX 0xE2 // Define flush RX register command
#define REUSE_TX_PL 0xE3 // Define reuse TX payload register command
#define NOP 0xFF // Define No Operation, might be used to read status register

// SPI(nRF24L01) registers(addresses)
#define CONFIG 0x00 // Config register address
#define EN_AA 0x01 // Enable Auto Acknowledgment register address
#define EN_RXADDR 0x02 // Enabled RX addresses register address
#define SETUP_AW 0x03 // Setup address width register address
#define SETUP_RETR 0x04 // Setup Auto. Retrans register address
#define RF_CH 0x05 // RF channel register address
#define RF_SETUP 0x06 // RF setup register address
#define STATUS 0x07 // Status register address
#define OBSERVE_TX 0x08 // Observe TX register address
#define CD 0x09 // Carrier Detect register address
#define RX_ADDR_P0 0x0A // RX address pipe0 register address
#define RX_ADDR_P1 0x0B // RX address pipe1 register address
#define RX_ADDR_P2 0x0C // RX address pipe2 register address
#define RX_ADDR_P3 0x0D // RX address pipe3 register address
#define RX_ADDR_P4 0x0E // RX address pipe4 register address
#define RX_ADDR_P5 0x0F // RX address pipe5 register address
#define TX_ADDR 0x10 // TX address register address
#define RX_PW_P0 0x11 // RX payload width, pipe0 register address
#define RX_PW_P1 0x12 // RX payload width, pipe1 register address
#define RX_PW_P2 0x13 // RX payload width, pipe2 register address
#define RX_PW_P3 0x14 // RX payload width, pipe3 register address
#define RX_PW_P4 0x15 // RX payload width, pipe4 register address
#define RX_PW_P5 0x16 // RX payload width, pipe5 register address
#define FIFO_STATUS 0x17 // FIFO Status Register register address

#endif /* _API_DEF_ */

#ifndef HAL_H
#define HAL_H
//硬件初始化
extern void ChipHalInit(void);
extern void ChipOutHalInit(void);
extern void delay_ms(u16 dly_ms);
extern void USART_Configuration(void);
extern void RF_SPI_Config(void);
extern volatile u16 Timer1,Timer2;
//RF_2401
extern void init_io(void);
extern void test (void);
extern u8 tran;//中断进入标志
extern u8 SPI_Read(u8 reg);
extern u8 SPI_RW(u8 byte);
#define TX_ADR_WIDTH 5 // 5字节宽度的发送/接收地址
#define TX_PLOAD_WIDTH 32 // 接收字节数32个字
#define uchar u8
/*控制引脚*/
#define CE_HGPIOC->BSRR=GPIO_Pin_4
#define CE_LGPIOC->BRR=GPIO_Pin_4

#define CSN_HGPIOB->BSRR=GPIO_Pin_2
#define CSN_LGPIOB->BRR=GPIO_Pin_2

#define IRQ(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_0))
#define IRQ_HGPIOB->BSRR=GPIO_Pin_0

#define LED1GPIOB->BSRR=GPIO_Pin_12
#define LED0GPIOB->BRR=GPIO_Pin_12
#define LED GPIOB->ODR=((GPIOD->ODR)^GPIO_Pin_12)

#define RX_DR ((sta>>6)&0X01)
#define TX_DS ((sta>>5)&0X01)
#define MAX_RT ((sta>>4)&0X01)

//USART
extern void USART2_Putc(unsigned char c);
extern void USART2_Puts(char * str);
extern u16 Uart2_Get_Flag;//串口2接收到数据长度
extern u8 Uart2_Get_Data;//串口2接收的数据
#endif

中断用前注意优先级的设置

#include "STM32Lib\stm32f10x.h"
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

/* 配置中断使用组合1*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/* EXTI0*/
NVIC_InitStructure.NVIC_IRQChannel =EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

/*UART2*/
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}