519 lines
12 KiB
C
519 lines
12 KiB
C
#include "24l01.h"
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#include "string.h"
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#include "stdlib.h"
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#include "stdio.h"
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#ifndef BOOTLOADER
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#include "rthw.h"
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#define IRQ_DISABLE() rt_enter_critical()
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#define IRQ_ENABLE() rt_exit_critical()
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#else
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#define IRQ_DISABLE() { }
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#define IRQ_ENABLE() { }
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#endif
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/*
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+--------------------------+
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|GND |3V3 | |
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|-----------| |
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|CE |CS | |
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|-----------| |
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|SCK |MOSI | |
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|-----------| |
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|MISO |INT | |
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+--------------------------+
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+--------------------------+
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|GND |3V3 | |
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|-----------| |
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|PE3 |PE4 | |
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|-----------| |
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|PE2 |PE6 | |
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|-----------| |
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|PE5 |PB6 | |
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+--------------------------+
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*/
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// 接口函数
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static void nrf24l01_dalay_us(int us)
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{
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#ifndef BOOTLOADER
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rt_hw_us_delay(us);
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#else
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for(int i=0;i<30;i++);
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#endif
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}
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static u32 nrf24l01_det_random(void)
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{
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static int d=0;
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d++;
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return d;
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}
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// 24L01片选信号 PE3
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#define NRF24L01_CE(s) GPIO_WriteBit(GPIOE,GPIO_Pin_3,(BitAction)s)
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// SPI片选信号 PE4
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#define NRF24L01_CSN(s) GPIO_WriteBit(GPIOE,GPIO_Pin_4,(BitAction)s)
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// IRQ主机数据输入 PB6
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#define NRF24L01_IRQ() GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_6)
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typedef struct
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{
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// 总中断服务函数
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void (*irq)(void);
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// 发送完成回调
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void (*send_end_cb)(void *);
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void *send_end_cb_par;
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// 接收到数据回调
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void (*recved_cb)(void *);
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void *recved_cb_par;
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}nrf_struct;
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static nrf_struct g_nrf={0};
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static const u8 TX_ADDRESS[TX_ADR_WIDTH]={0x34,0x43,0x10,0x10,0x01}; //发送地址
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static const u8 RX_ADDRESS[RX_ADR_WIDTH]={0x34,0x43,0x10,0x10,0x01}; //发送地址
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void nrf24l01_spi_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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SPI_InitTypeDef SPI_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI4,ENABLE);
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE,ENABLE);
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GPIO_PinAFConfig(GPIOE, GPIO_PinSource2, GPIO_AF_SPI4);
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GPIO_PinAFConfig(GPIOE, GPIO_PinSource5, GPIO_AF_SPI4);
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GPIO_PinAFConfig(GPIOE, GPIO_PinSource6, GPIO_AF_SPI4);
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
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/*!< SPI SCK pin configuration */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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/*!< SPI MOSI pin configuration */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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/*!< SPI MISO pin configuration */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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/*!< Configure sFLASH Card CS pin in output pushpull mode ********************/
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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//失能SPI外设
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SPI_Cmd(SPI4, DISABLE);
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//设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
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SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
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//设置SPI工作模式:设置为主SPI
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SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
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//设置SPI的数据大小:SPI发送接收8位帧结构
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SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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//串行同步时钟的空闲状态为低电平
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SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
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//串行同步时钟的第1个跳变沿（上升或下降）数据被采样
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SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
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//NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
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SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
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//定义波特率预分频的值:波特率预分频值为256
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SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
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//指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
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SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
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//CRC值计算的多项式
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SPI_InitStructure.SPI_CRCPolynomial = 7;
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//根据SPI_InitStruct中指定的参数初始化外设SPIx寄存器
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SPI_Init(SPI4, &SPI_InitStructure);
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//使能SPI外设
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SPI_Cmd(SPI4, ENABLE);
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}
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// 软件初始化，默认进入接收模式
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void nrf24l01_sort_init(void);
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//初始化24L01的IO口
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void nrf24l01_init(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOE, ENABLE);//使能GPIOB,G时钟
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_EXTIT,ENABLE);
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);//使能SYSCFG时钟
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// GE3 片选推挽输出
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; //普通输出模式
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //推挽输出
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; //100MHz
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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// GB6 中断输入
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; //输入
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //上拉
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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EXTI_InitTypeDef EXTI_InitStruct={0};
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SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB,EXTI_PinSource6);
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EXTI_InitStruct.EXTI_Line= EXTI_Line6;
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EXTI_InitStruct.EXTI_Mode= EXTI_Mode_Interrupt;
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EXTI_InitStruct.EXTI_Trigger= EXTI_Trigger_Falling;
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EXTI_InitStruct.EXTI_LineCmd= ENABLE;
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EXTI_Init(&EXTI_InitStruct);
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NVIC_InitTypeDef NVIC_InitStructure;
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NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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// 针对NRF的特点初始化SPI的设置
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nrf24l01_spi_init();
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NRF24L01_CE(0); //使能24L01
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NRF24L01_CSN(1); //SPI片选取消
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nrf24l01_sort_init();
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}
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// 去初始化
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void nrf24l01_deinit(void)
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{
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EXTI_InitTypeDef EXTI_InitStruct={0};
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EXTI_InitStruct.EXTI_Line= EXTI_Line6;
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EXTI_InitStruct.EXTI_Mode= EXTI_Mode_Interrupt;
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EXTI_InitStruct.EXTI_Trigger= EXTI_Trigger_Falling;
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EXTI_InitStruct.EXTI_LineCmd= DISABLE;
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EXTI_Init(&EXTI_InitStruct);
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NRF24L01_CE(0);
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}
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void EXTI9_5_IRQHandler(void)
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{
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if(EXTI_GetITStatus(EXTI_Line6)==SET)
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{
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EXTI_ClearITPendingBit(EXTI_Line6);
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if(g_nrf.irq) g_nrf.irq();
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}
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}
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u8 spi_read_write_byte(u8 txdata)
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{
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// 等待发送区空
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while (SPI_I2S_GetFlagStatus(SPI4, SPI_I2S_FLAG_TXE) == RESET){}
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// 通过外设SPIx发送一个byte 数据
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SPI_I2S_SendData(SPI4, txdata);
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// 等待接收完一个byte
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while (SPI_I2S_GetFlagStatus(SPI4, SPI_I2S_FLAG_RXNE) == RESET){}
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// 返回通过SPIx最近接收的数据
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return SPI_I2S_ReceiveData(SPI4);
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}
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//SPI写寄存器
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//reg:指定寄存器地址
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//value:写入的值
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u8 nrf24l01_write_reg(u8 reg,u8 value)
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{
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u8 status;
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NRF24L01_CSN(0); //使能SPI传输
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status =spi_read_write_byte(reg);//发送寄存器号
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spi_read_write_byte(value); //写入寄存器的值
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NRF24L01_CSN(1); //禁止SPI传输
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return(status); //返回状态值
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}
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//读取SPI寄存器值
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//reg:要读的寄存器
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u8 nrf24l01_read_reg(u8 reg)
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{
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u8 reg_val;
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NRF24L01_CSN(0); //使能SPI传输
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spi_read_write_byte(reg); //发送寄存器号
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reg_val=spi_read_write_byte(0XFF);//读取寄存器内容
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NRF24L01_CSN(1); //禁止SPI传输
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return(reg_val); //返回状态值
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}
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//在指定位置读出指定长度的数据
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//reg:寄存器(位置)
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//*pBuf:数据指针
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//len:数据长度
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//返回值,此次读到的状态寄存器值
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u8 nrf24l01_read_buf(u8 reg,u8 *pBuf,u8 len)
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{
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u8 status,u8_ctr;
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NRF24L01_CSN(0); //使能SPI传输
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status=spi_read_write_byte(reg);//发送寄存器值(位置),并读取状态值
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for(u8_ctr=0;u8_ctr<len;u8_ctr++)pBuf[u8_ctr]=spi_read_write_byte(0XFF);//读出数据
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NRF24L01_CSN(1); //关闭SPI传输
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return status; //返回读到的状态值
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}
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//在指定位置写指定长度的数据
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//reg:寄存器(位置)
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//*pBuf:数据指针
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//len:数据长度
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//返回值,此次读到的状态寄存器值
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u8 nrf24l01_write_buf(u8 reg, u8 *pBuf, u8 len)
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{
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u8 status,u8_ctr;
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NRF24L01_CSN(0); //使能SPI传输
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status = spi_read_write_byte(reg);//发送寄存器值(位置),并读取状态值
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for(u8_ctr=0; u8_ctr<len; u8_ctr++)spi_read_write_byte(*pBuf++); //写入数据
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NRF24L01_CSN(1); //关闭SPI传输
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return status; //返回读到的状态值
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}
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//检测24L01是否存在
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//返回值:0，成功;1，失败
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u8 nrf24l01_check(void)
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{
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u8 i;
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u8 old[5];
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nrf24l01_read_buf(TX_ADDR,old,5);
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u8 buf[5]={0XA5,0XA5,0XA5,0XA5,0XA5};
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nrf24l01_write_buf(NRF_WRITE_REG+TX_ADDR,buf,5);//写入5个字节的地址.
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nrf24l01_read_buf(TX_ADDR,buf,5); //读出写入的地址
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for(i=0;i<5;i++)if(buf[i]!=0XA5)break;
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if(i!=5)return 1;//检测24L01错误
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nrf24l01_write_buf(NRF_WRITE_REG+TX_ADDR,old,5);//写入5个字节的地址.
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return 0; //检测到24L01
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}
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// 设置地址，我的，对方的
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void nrf24l01_set_addr(u8 my[5],u8 dst[5])
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{
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//写TX节点地址
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nrf24l01_write_buf(NRF_WRITE_REG+TX_ADDR,(u8*)dst,TX_ADR_WIDTH);
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//设置RX节点地址,主要为了使能ACK
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nrf24l01_write_buf(NRF_WRITE_REG+RX_ADDR_P0,(u8*)my,RX_ADR_WIDTH);
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}
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// 设置通信信道
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void nrf24l01_set_chan(u8 chan)
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{
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//设置RF通道为chan
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nrf24l01_write_reg(NRF_WRITE_REG+RF_CH,chan&0x3f);
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}
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// 设置接收到数据的回调函数
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void nrf24l01_set_recv_cb(void(*fun)(void *t),void *t)
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{
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g_nrf.recved_cb=fun;
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g_nrf.recved_cb_par=t;
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}
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// 设置发送数据完成的回调函数
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void nrf24l01_set_send_cb(void(*fun)(void *t),void *t)
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{
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g_nrf.send_end_cb=fun;
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g_nrf.send_end_cb_par=t;
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}
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// 设置产生中断时的回调函数
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void nrf24l01_set_irq_cb(void(*fun)(void))
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{
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g_nrf.irq=fun;
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}
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// 软件初始化，默认进入接收模式
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void nrf24l01_sort_init(void)
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{
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g_nrf.irq=nrf24l01_irq;
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NRF24L01_CE(0);
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//写TX节点地址
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nrf24l01_write_buf(NRF_WRITE_REG+TX_ADDR,(u8*)TX_ADDRESS,TX_ADR_WIDTH);
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//设置RX节点地址,主要为了使能ACK
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nrf24l01_write_buf(NRF_WRITE_REG+RX_ADDR_P0,(u8*)RX_ADDRESS,RX_ADR_WIDTH);
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//禁止自动应答
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nrf24l01_write_reg(NRF_WRITE_REG+EN_AA,0x00);
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//使能通道0的接收地址
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nrf24l01_write_reg(NRF_WRITE_REG+EN_RXADDR,0x01);
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//选择通道0的有效数据宽度
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nrf24l01_write_reg(NRF_WRITE_REG+RX_PW_P0,RX_PLOAD_WIDTH);
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//禁止自动重发
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nrf24l01_write_reg(NRF_WRITE_REG+SETUP_RETR,0x0);
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//设置RF通道为40
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nrf24l01_write_reg(NRF_WRITE_REG+RF_CH,40);
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//设置TX发射参数,0db增益,2Mbps,低噪声增益开启
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nrf24l01_write_reg(NRF_WRITE_REG+RF_SETUP,0x0f);
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//接收模式，0xf;发送模式0xe，开启crc16
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nrf24l01_write_reg(NRF_WRITE_REG+CONFIG,0x0f);
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u8 sta=0;
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sta=nrf24l01_read_reg(STATUS);
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// 清除TX_DS或MAX_RT中断标志
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nrf24l01_write_reg(NRF_WRITE_REG+STATUS,sta);
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// 如果rxfifo中有数据，则不会再产生接收中断，这里清除RX FIFO寄存器
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nrf24l01_write_reg(FLUSH_RX,0xff);
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//CE为高
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NRF24L01_CE(1);
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}
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// 发送数据
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// data，要发送的数据指针
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// len，数据长度，不能超过32字节
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int nrf24l01_send(void *data)
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{
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NRF24L01_CE(0);
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//接收模式，0xf;发送模式0xe，开启crc16
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nrf24l01_write_reg(NRF_WRITE_REG+CONFIG,0x0e);
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//写数据到TX BUF 32个字节
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nrf24l01_write_buf(WR_TX_PLOAD,data,TX_PLOAD_WIDTH);
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NRF24L01_CE(1);
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return 0;
|
||
}
|
||
|
||
|
||
|
||
|
||
// 读取接收到的数据 ,返回0成功
|
||
// buf，接收数据缓冲
|
||
int nrf24l01_read(void *buf)
|
||
{
|
||
nrf24l01_read_buf(RD_RX_PLOAD,buf,RX_PLOAD_WIDTH);//读取数据
|
||
return 0;
|
||
}
|
||
|
||
|
||
|
||
// nrf的中断服务函数
|
||
void nrf24l01_irq(void)
|
||
{
|
||
u8 sta=0;
|
||
sta=nrf24l01_read_reg(STATUS); //读取状态寄存器的值
|
||
nrf24l01_write_reg(NRF_WRITE_REG+STATUS,sta); //清除TX_DS或MAX_RT中断标志
|
||
if(sta&TX_OK)//发送完成
|
||
{
|
||
//发送完成之后自动切换为接收模式
|
||
NRF24L01_CE(0);
|
||
nrf24l01_write_reg(NRF_WRITE_REG+CONFIG,0x0f);
|
||
NRF24L01_CE(1);
|
||
if(g_nrf.send_end_cb)
|
||
g_nrf.send_end_cb(g_nrf.send_end_cb_par);
|
||
}
|
||
else if(sta&RX_OK)
|
||
{
|
||
if(g_nrf.recved_cb)
|
||
g_nrf.recved_cb(g_nrf.recved_cb_par);
|
||
// 读取之后，清除RX FIFO寄存器
|
||
nrf24l01_write_reg(FLUSH_RX,0xff);
|
||
|
||
}
|
||
|
||
}
|
||
|
||
|
||
|
||
|
||
|
||
|