STM32如何配置使用SPI通信

SPI是一种高速的，全双工，同步的通信总线，原理和使用简单，占用引脚资源少， 是一种常用的通信方式。

STM32通常有2~3个SPI接口

根据STM32手册的使用方法：

1. Enable peripheral clock 

2. Enable SCK, MOSI, MISO and NSS GPIO clocks 

3. Peripherals alternate function:

 Connect the pin to the desired peripherals' Alternate Function (AF) 

 Call GPIO_Init() function.

4. Program the Polarity, Phase, First Data, Baud Rate Prescaler, Slave Management,Peripheral Mode and CRC Polynomial values using the SPI_Init() function in SPI mode.

5. Configure the FIFO threshold using SPI_RxFIFOThresholdConfig() to select at which hreshold the RXNE event is genera