spi 16 bit mode slave

[ab.antonov9]

Posted on July 09, 2012 at 21:06

I have a problem. I connected to spi stm32f103 and stm32f405. The data is transmitted, but only 8 bits. Initialization codes below. What is the problem?

Code for master (stm32f103):

SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;

SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 15;

SPI_Init(SPI1, &SPI_InitStructure);

SPI_SSOutputCmd(SPI1, ENABLE);

SPI_Cmd(SPI1, ENABLE);

Code for slave (stm32f405):

SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx; //SPI_Direction_2Lines_FullDuplex;

SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;

SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 15;

SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

SPI_Init(SPI1, &SPI_InitStructure);

SPI_I2S_DeInit(SPI1);

SPI_Cmd(SPI1, ENABLE);

#spi-16-bit-mode-slave

[Tesla DeLorean]

Posted on July 09, 2012 at 23:22

Want to do the SPI_I2S_DeInit(SPI1); BEFORE you initialize the SPI not after, and thus destroying all settings.

[ab.antonov9]

Posted on July 10, 2012 at 20:52

Clive, thank you for remark. Really not correct is written. By tests has adjusted spi slave.

Here is my code.

For Master (F103):

SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;

SPI_InitStructure.SPI_Mode = SPI_Mode_Master;

SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

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_16;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 15;

SPI_Init(SPI1, &SPI_InitStructure);

SPI_SSOutputCmd(SPI1, ENABLE);

SPI_Cmd(SPI1, ENABLE);

For Slave (F405):

SPI_I2S_DeInit(SPI1);

SPI_DataSizeConfig(SPI1,SPI_DataSize_16b);

SPI_BiDirectionalLineConfig(SPI1,SPI_Direction_1Line_Rx);

SPI_Cmd(SPI1, ENABLE);

16 bits are sent it is correct.

I do not understand why following code does not work for F405? Where mistake?

SPI_I2S_DeInit(SPI1);

SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx; 

SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;

SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;

SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;

SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 15;

SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;

SPI_Init(SPI1, &SPI_InitStructure);

SPI_Cmd(SPI1, ENABLE);

I have adjusted DMA mode for spi1. Can who needs.

DMA_DeInit(DMA2_Stream0); 

DMA_InitStructure.DMA_Channel=DMA_Channel_3;

DMA_InitStructure.DMA_PeripheralBaseAddr=((uint32_t)SPI1+0x0c);

DMA_InitStructure.DMA_Memory0BaseAddr=(uint32_t)&In_Value;

DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralToMemory;

DMA_InitStructure.DMA_BufferSize=1;

DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;

DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Disable;

DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;

DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;

DMA_InitStructure.DMA_Mode=DMA_Mode_Circular;

DMA_InitStructure.DMA_Priority=DMA_Priority_VeryHigh;

DMA_InitStructure.DMA_FIFOMode=DMA_FIFOMode_Disable;

DMA_InitStructure.DMA_FIFOThreshold=DMA_FIFOThreshold_HalfFull;

DMA_InitStructure.DMA_MemoryBurst=DMA_MemoryBurst_Single;

DMA_InitStructure.DMA_PeripheralBurst=DMA_PeripheralBurst_Single;

DMA_Init(DMA2_Stream0, &DMA_InitStructure);

SPI_DMACmd(SPI1,SPI_I2S_DMAReq_Rx,ENABLE);

DMA_Cmd(DMA2_Stream0, ENABLE);

Clive, You very experienced programmer, can prompt where me to find usb audio example for F4 controller?

[Tesla DeLorean]

Posted on July 10, 2012 at 22:31

Doesn't look unreasonable. Make sure connect the master/slave MOSI and MISO one-to-one, ie not crossed over.

A useful example might be

\STM32F4xx_DSP_StdPeriph_Lib_V1.0.1\Project\STM32F4xx_StdPeriph_Examples\SPI\SPI_TwoBoards\DataExchangeInterrupt

I downloaded my last USB library from here :

http://www.st.com/internet/com/SOFTWARE_RESOURCES/SW_COMPONENT/FIRMWARE/stm32_f105-07_f2_f4_usb-host-device_lib.zip

It has a USB/AUDIO example here :

STM32_USB-Host-Device_Lib_V2.1.0\Project\USB_Device_Examples\AUDIO\

I'd also recommend pulling down the DSP library, and other STM32F4 firmwares/libraries as there are quite a mix of releases and examples. Why this hasn't be done in a more cohesive way I don't know, I've learned to download and archive everything.

[ab.antonov9]

Posted on July 11, 2012 at 21:53

Thanks for the info. I found a working example for F4discovery usb audio.

The sound did not meet my expectations. :(