Question

I am using STM32F103ZE
I am not getting SPI data correctly.
Master is transmitting correctly.
But always read as zero where a non zero value has been sent.

Master config: (MSP430)

The master configuration is correct. (I tested it.)
Master Mode, MSB First, 8-bit SPI, 
Inactive state is high, SS grounded, 1 MHz clock, no dividers

Slave Config (STM32F103ZE)

    Using SPI2.
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx
    SPI_InitStructure.SPI_Mode = SPI_Mode_Slave
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB
    SPI_InitStructure.SPI_CRCPolynomial = 7

Anybody have an ANSWER,

Thanks
Hari

Answer 1

I know, the question is quite old. Still, since I have faced the same problem the last days, I’ll try to give an answer for future readers.

The following code works on the STM32F407, which is used on the STM32 discovery board. What I can see from the datasheet, the SPI peripheral is the same as on the STM32F103, so
I expect the code to run on the other microcontroller without modifications.

#include "stm32f4xx.h"

[... configure the pins SCK, MISO, MOSI and NSS ...]

// Configure the SPI as: Slave, 8 bit data, clock high when idle, capture on 
// 1st edge, baud rate prescaler 2, MSB first.
SPI1->CR1 = SPI_CR1_CPOL;
// No interrupts, no DMA and Motorola frame format.
SPI1->CR2 = 0;
// Enable the peripheral.
SPI1->CR1 |= SPI_CR1_SPE;

// Wait until some data has been sent to the slave and print it.
while ((SPI1->SR & SPI_SR_RXNE) == 0);
printf("Received: %d\n", SPI1->DR);

Two things are different in this initialization procedure from the code posted in the question:

1. Do not select bidirectional mode for ordinary SPI with the 3 lines SCK, MISO and MOSI.
   Both MISO and MOSI are unidirectional lines.

2. I use hardware slave select management, i.e. the bit SSM is not set. This way, the
   SPI peripheral can automatically detect when the device has been asserted (the pin
   NSS goes low) and will
   store the MOSI bits in a shift register. When enough bits have been read (8 or
   16 depending on the selected data format),
   the flag RXNE is set in the status register and the transmitted value can be read
   from the register DR.

Hope that helps.