写一个基于stm32f103c8t6控制nrf05,当接收到信息时,执行中断
时间: 2024-04-15 10:07:16 浏览: 9
首先,需要连接STM32F103C8T6和nRF24L01+。连接图如下:
nRF24L01+ | STM32F103C8T6
---------|-----------------
GND | GND
VCC | 3.3V
CE | PB0
CSN | PB1
SCK | PB13
MOSI | PB15
MISO | PB14
IRQ | PB12
其中,CE、CSN、SCK、MOSI、MISO和IRQ分别连接到STM32F103C8T6的相应引脚。
接下来,需要编写程序。首先,需要初始化GPIO和SPI。初始化代码如下:
```c
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Enable SPI clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
/* Configure SPI pins */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure CE and CSN pins */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure IRQ pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Configure SPI */
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI */
SPI_Cmd(SPI1, ENABLE);
```
然后,需要初始化nRF24L01+。初始化代码如下:
```c
void nRF24L01_Init(void)
{
/* Set CE and CSN high */
GPIO_SetBits(GPIOB, GPIO_Pin_0 | GPIO_Pin_1);
/* Power up and initialize nRF24L01+ */
nRF24L01_WriteReg(NRF_CONFIG, 0x0A);
nRF24L01_WriteReg(NRF_EN_AA, 0x01);
nRF24L01_WriteReg(NRF_EN_RXADDR, 0x01);
nRF24L01_WriteReg(NRF_SETUP_AW, 0x03);
nRF24L01_WriteReg(NRF_SETUP_RETR, 0x03);
nRF24L01_WriteReg(NRF_RF_CH, 0x4C);
nRF24L01_WriteReg(NRF_RF_SETUP, 0x06);
nRF24L01_WriteReg(NRF_STATUS, 0x70);
nRF24L01_WriteReg(NRF_RX_PW_P0, 0x20);
nRF24L01_WriteReg(NRF_FEATURE, 0x06);
/* Flush RX and TX FIFO */
nRF24L01_FlushRX();
nRF24L01_FlushTX();
/* Set CE low */
GPIO_ResetBits(GPIOB, GPIO_Pin_0);
/* Enable IRQ interrupt */
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource12);
EXTI_InitStructure.EXTI_Line = EXTI_Line12;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI15_10_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
```
在初始化nRF24L01+时,需要将IRQ引脚配置为中断引脚,并在中断处理函数中执行相应的操作。中断处理函数代码如下:
```c
void EXTI15_10_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line12) != RESET)
{
uint8_t status = nRF24L01_ReadReg(NRF_STATUS);
if (status & NRF_RX_DR)
{
/* Data received */
uint8_t rx_data[32];
nRF24L01_ReadPayload(rx_data, 32);
/* Do something with received data */
}
EXTI_ClearITPendingBit(EXTI_Line12);
}
}
```
在主函数中,可以调用nRF24L01_Init()函数初始化nRF24L01+,然后等待中断的发生。当接收到数据时,中断处理函数会被调用,并且执行相应的操作。