CC1101是一款无线通信芯片,通常通过SPI(串行外设接口)与微控制器(MCU)进行通信。以下是一个基于STM32微控制器的CC1101编程的基本步骤和示例代码:
1. 初始化SPI和GPIO
首先,需要配置SPI和GPIO引脚。以下是一个示例代码,展示如何在STM32F103微控制器上初始化SPI1接口和GPIOB引脚:
```c
include "stm32f10x.h"
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
// Enable GPIOB clock
RCC->APB2ENR |= (1 << 2);
// Configure GPIOB Pin 0 and 1 as SPI MOSI and MISO
GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Alternate = GPIO_AF_SPI1;
GPIO_Init(GPIOB, &GPIO_InitStruct);
}
void SPI_Configuration(void)
{
SPI_InitTypeDef SPI_InitStruct;
// Enable SPI1 clock
RCC->APB2ENR |= (1 << 12);
// Configure SPI1
SPI_InitStruct.SPI_Mode = SPI_MODE_MASTER;
SPI_InitStruct.SPI_Direction = SPI_DIRECTION_2;
SPI_InitStruct.SPI_DataSize = SPI_DATASIZE_8BIT;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_LOW;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1ST_EDGE;
SPI_InitStruct.SPI_NSS = SPI_NSS_SOFT;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
SPI_InitStruct.SPI_FirstBit = SPI_FIRSTBIT_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStruct);
}
```
2. 初始化CC1101
接下来,需要初始化CC1101芯片。以下是一个示例代码,展示如何初始化CC1101并设置其工作模式:
```c
include "stm32f10x.h"
void CC1101_Init(SPI_HandleTypeDef *hspi)
{
// Reset CC1101
CC1101Reset(hspi);
// Initialize CC1101
CC1101Init(hspi);
// Set SPI clock rate to 2 MHz (16 MHz / 8)
SPI_SetBaudRate(hspi, 2000000);
// Set CS pin high
HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5, GPIO_PIN_SET);
}
```
3. 读写寄存器
CC1101的寄存器可以通过SPI接口进行读写。以下是一个示例代码,展示如何读取和写入寄存器:
```c
include "stm32f10x.h"
void CC1101_WriteReg(SPI_HandleTypeDef *hspi, uint8_t reg, uint8_t value)
{
// Write address
SPI_TransmitData(hspi, reg);
// Write value
SPI_TransmitData(hspi, value);
}
uint8_t CC1101_ReadReg(SPI_HandleTypeDef *hspi, uint8_t reg)
{
uint8_t value;
// Write address
SPI_TransmitData(hspi, reg | 0x80);
// Read value
value = SPI_ReceiveData(hspi);
return value;
}
```
4. 示例程序