SPI_InitStructure
时间: 2024-07-10 11:00:33 浏览: 88
关于SPI通信协议的NSS
SPI_InitStructure(简称SPI_InitStructure)通常是指用于配置Serial Peripheral Interface(SPI)接口的一种结构体或枚举类型,在许多微控制器的硬件抽象层(HAL)库中常见。它包含了SPI通信的各种参数,如时钟频率、数据模式、数据位宽、片选信号的行为等。
在STM32系列的CubeMX或Keil的库中,SPI_InitStructure可能是这样定义的:
```c
typedef struct {
uint32_t Cr1; // SPI Control Register 1
uint32_t Cr2; // SPI Control Register 2
SPI_BaudRatePrescalerTypeDef Prescaler; // Baud Rate Prescaler
uint32_t CPOL; // Clock Polarity
uint32_t CPHA; // Clock Phase
uint32_t NSS; // Chip Select
FunctionalState NewState; // Enable or Disable the peripheral
} SPI_InitTypeDef;
```
要初始化SPI,开发者会创建一个SPI_InitTypeDef实例,并设置相应的参数,然后传递给`HAL_SPI_Init()`函数来配置SPI接口。
例如,设置一个基本的SPI初始化:
```c
SPI_InitTypeDef SPI_InitStructure;
SPI_InitStructure.CR1 = SPI_CR1_SPE | SPI_CR1_MSTR; // Enable SPI and Master mode
SPI_InitStructure.CR2 = 0; // No special settings for CR2
SPI_InitStructure.Prescaler = SPI_BAUDRATEPRESCALER_2; // Set prescaler to divide clock by 2
SPI_InitStructure.CPOL = SPI_CPOL_HIGHPOLARITY; // Active high clock polarity
SPI_InitStructure.CPHA = SPI_CPHA_1EDGE; // Sample data on first edge of clock
SPI_InitStructure.NSS = SPI_NSS_SOFT; // Software control of chip select
SPI_InitStructure.NewState = ENABLE; // Enable the SPI
HAL_SPI_Init(&hspi1, &SPI_InitStructure); // hspi1 是SPI实例的句柄
```
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