SPI1 mit SPL für einen 411RE, sollte aber Pin-Kompatibel mit dem 446 sein. Für CS muss noch ein Pin konfiguriert werden.
Code:
#include "SPI.h"


void Spi_Init(SPI_TypeDef *SPIx)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    SPI_InitTypeDef  SPI_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    // Periph clock enable
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);

    // Configure SPI pins: SCK, MOSI
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_7;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_DOWN;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // Configure pins: MISO
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_Init(GPIOA, &GPIO_InitStructure);


    // Reset SPI Interface
    SPI_I2S_DeInit(SPIx);

    // SPI configuration
    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_Low;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPIx, &SPI_InitStructure);

    SPI_CalculateCRC(SPIx, DISABLE);

    // Enable the SPI
    SPI_Cmd(SPIx, ENABLE);
}

uint8_t Spi_ReadByte(SPI_TypeDef *SPIx)
{
    return Spi_WriteByte(SPIx, 0xFF);
}

uint8_t Spi_WriteByte(SPI_TypeDef *SPIx, uint8_t _data)
{
    // Loop while DR register is not empty
    while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_TXE) == RESET);

    // Send byte through the SPIx peripheral
    SPI_I2S_SendData(SPIx, _data);

    while(SPI_I2S_GetFlagStatus(SPIx, SPI_I2S_FLAG_RXNE) == RESET);

    // Return the byte read from the SPI bus
    return (uint8_t)SPI_I2S_ReceiveData(SPIx); }
mfg