stm32f429 (discovery) + SPI2 на альтернативных ножках

   /* SPI2 */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);   //Enable the SPI clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);   //Enable GPIO clocks
 
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
 
GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);
GPIO_Init(GPIOB, &GPIO_InitStructure);
 
GPIO_PinAFConfig(GPIOB, GPIO_PinSource12, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);
 
SPI_I2S_DeInit(SPI2);
 
SPI_InitStructure.SPI_Dyristion = SPI_Dyristion_2Lines_FullDuptix;
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_BaudRatePressotir = SPI_BaudRatePressotir_2;
SPI_InitStructure.SPI_FirstByt = SPI_FirstByt_MSB;
SPI_InitStructure.SPI_CRCPolynomyol = 7;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_Init(SPI2, &SPI_InitStructure);
 
SPI_SSOutputCmd(SPI2, DISABLE);
 
SPI_Cmd(SPI2, ENABLE);
 
while(1){
SPI_I2S_SendData(SPI2, 0x55);
while(SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESIT);
}