SPI problem in STM32L

It seems sth is making SPI disabled. I added wait cycle after sending data, but in scope no signal appear.

RCC_AHBPeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); RCC_AHBPeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

Not on the AHB

Dear Pier,

Thanks. I corrected the code.

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);

Yet I don't have signals.

looking at your code. I am wondering about if you are setting up SPI2. I see some of the lower code as duplicate of code you already typed in. You declare master mode two times. the code looks the same.

Dear Gary,
I initialized SPI1 and SPI2 to check if any will work. (both master and independent)

Dear John,
I tested the program in both boards.The one I made with STM32L152VD and STM32L discovery both have same problem.
I check the SCK and MISO by scope while not connected to slave. Is it necessary to connect to slave in SPI while checking by scope?

No much use looking at the MISO signal without a slave. This signal is Master In, Slave Out. So driven by the slave.

It's the MOSI you want to look at - Master Out, Slave In. But then you don't want to send 0xFFFF since that doesn't give you any nice action on the pin.

The clock signal is always owned by the master and should always play when the master tries to send - no need for any slave connected.

Dear Per,
You are right. It was a mistake in typing. I am expecting to see signals on SCK and MOSI.

As I see the following piece of code has been repeated many times by developers the same in the web.
I surprise Y it not works in my discovery board!
I expect to see the signals in scope but I see nothing.

void SPI_RCC_Configuration()
{

                RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB,ENABLE);
                RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2,ENABLE);

}

 void SPI_GPIO_Configuration(void)
{
          GPIO_InitTypeDef GPIO_InitStruct;
                GPIO_InitStruct.GPIO_Pin =  GPIO_Pin_13 | GPIO_Pin_14|GPIO_Pin_15;
                GPIO_InitStruct.GPIO_Speed = GPIO_Speed_40MHz;
                GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
          GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
          GPIO_Init(GPIOB, &GPIO_InitStruct);

                GPIO_InitStruct.GPIO_Pin = GPIO_Pin_12;
                GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
          GPIO_InitStruct.GPIO_OType=GPIO_OType_PP;
                GPIO_Init(GPIOB, &GPIO_InitStruct);
                GPIO_SetBits(GPIOB,GPIO_Pin_12);

}

void SPI_Configuration(void)
{
        SPI_InitTypeDef SPI_InitStruct;

        SPI_RCC_Configuration();

        SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;
        SPI_InitStruct.SPI_Direction= SPI_Direction_2Lines_FullDuplex;
        SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
        SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
        SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
        SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
        SPI_InitStruct.SPI_NSS = SPI_NSS_Hard;
        SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
        SPI_InitStruct.SPI_CRCPolynomial = 7;
        SPI_Init(SPI2, &SPI_InitStruct);

        SPI_GPIO_Configuration();

        SPI_SSOutputCmd(SPI2, ENABLE);
        SPI_Cmd(SPI2, ENABLE);
}

//MAIN.C
#include "stm32l1xx.h"
#include "clock.h"
#include "spi_driver.h"




int main(void)
{
int i;
SystemCoreClockSetHSI();
        SPI_RCC_Configuration();
        SPI_Configuration();
        SPI_GPIO_Configuration();




        while(1)
        {
                SPI2->DR = 1; //sending 1 as data
                for(i=0;i<100000;i++) __nop();
        }




return 0;
}

Why would SPI_GPIO_Configuration be called twice? Once in the SPI_Configuration Function and once in the main() function.

google

SPI problem with hardware NSS management
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