GD32F130G8 SPI0数据读出全为0xFF，求助！

只看该作者 · 2019-10-29 22:26

本帖最后由 ppp_1978 于 2019-10-29 22:30 编辑

   pa15 - CS,pb3 - pb5设置为SPI0读取外部设备,三个IO上用示波器都能看到数据,但是的spi0_data读出来始终为0xFF，硬件没有问题，同样使用这几个IO模拟SPI读写都没有问题，求帮助！
void RCU_Init(void)
{
      rcu_periph_clock_enable(RCU_GPIOA);
      rcu_periph_clock_enable(RCU_GPIOB);
      rcu_periph_clock_enable(RCU_SPI0);
}

void GPIO_Init(void)
{
gpio_mode_set(GPIOA,GPIO_MODE_OUTPUT,GPIO_PUPD_NONE,iCS_PinA15);
gpio_output_options_set(GPIOA,GPIO_OTYPE_PP,GPIO_OSPEED_10MHZ,iCS_PinA15);

gpio_af_set(GPIOB,GPIO_AF_0,iSCK_PinB3|iMISO_PinB4|iMOSI_PinB5);       gpio_mode_set(GPIOB,GPIO_MODE_AF,GPIO_PUPD_NONE,iSCK_PinB3|iMISO_PinB4|iMOSI_PinB5);    gpio_output_options_set(GPIOB,GPIO_OTYPE_PP,GPIO_OSPEED_50MHZ,iSCK_PinB3|iMISO_PinB4|iMOSI_PinB5);
}

void SPI0_Init(void)
{
      spi_parameter_struct spi_init_struct;

      spi_init_struct.trans_mode          = SPI_TRANSMODE_FULLDUPLEX;
      spi_init_struct.device_mode       = SPI_MASTER;
      spi_init_struct.frame_size          = SPI_FRAMESIZE_8BIT;
      spi_init_struct.clock_polarity_phase = SPI_CK_PL_HIGH_PH_2EDGE;
      spi_init_struct.nss                = SPI_NSS_SOFT;
      spi_init_struct.prescale          = SPI_PSC_8;
      spi_init_struct.endian             = SPI_ENDIAN_MSB;
      spi_init(SPI0,&spi_init_struct);

      spi_enable(SPI0);
}

#define uchar                unsigned char
#define SPI0_Enable()    gpio_bit_reset(GPIOA,iCS_PinA15)
#define SPI0_Disable()    gpio_bit_set(GPIOA,iCS_PinA15)

void SPI0_RegByte_Write(uchar addr_reg,uchar data_reg)
{
      SPI0_Enable();

      while(spi_i2s_flag_get(SPI0,SPI_FLAG_TBE) == 0);
      spi_i2s_data_transmit(SPI0,addr_reg);
      while(spi_i2s_flag_get(SPI0,SPI_FLAG_RBNE) == 0);
      spi_i2s_data_receive(SPI0);

      while(spi_i2s_flag_get(SPI0,SPI_FLAG_TBE) == 0);
      spi_i2s_data_transmit(SPI0,data_reg);
      while(spi_i2s_flag_get(SPI0,SPI_FLAG_RBNE) == 0);
      spi_i2s_data_receive(SPI0);

      SPI0_Disable();
}

uchar SPI0_RegByte_Read(uchar addr_reg)
{
      uchar mSPI0_Temp;

      SPI0_Enable();

      while(spi_i2s_flag_get(SPI0,SPI_FLAG_TBE) == 0);
      spi_i2s_data_transmit(SPI0,addr_reg|0x80);
      while(spi_i2s_flag_get(SPI0,SPI_FLAG_RBNE) == 0);
      mSPI0_Temp = spi_i2s_data_receive(SPI0);

      while(spi_i2s_flag_get(SPI0,SPI_FLAG_TBE) == 0);
      spi_i2s_data_transmit(SPI0);
      while(spi_i2s_flag_get(SPI0,SPI_FLAG_RBNE) == 0);
      mSPI0_Temp = spi_i2s_data_receive(SPI0);

      ISPI0_Disable();

      return mSPI0_Temp;
}

只看该作者 · 2019-10-30 10:34

我也是服了，明明分析仪抓到miso上的数据对的，spi0的数据寄存器就读出来0xFF

只看该作者 · 2019-10-30 13:49

本帖最后由 lvben5d 于 2019-10-30 13:50 编辑

我给你发我试过OK的SPI驱动函数吧。 SPI 一般4种模式  M0 M3会常用一些。我的是F130芯片，但是你改F103库函数行只都一样。
void spi0_sendbyte(u8 byte)
{
      spi_i2s_data_send(SPI0, byte);
      while(RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE)) ;
}

u8 spi0_recvbyte()
{
      u8 byte=0xFF;
      spi_i2s_data_send(SPI0, byte);
      while(RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE)) {}
      return byte;
}

u8 spi0_sendrecvbyte(u8 byte)
{
      while(RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE))  ;
      spi_i2s_data_send(SPI0, byte);
      while(RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE)) {}
      return spi_i2s_data_receive(SPI0);
}

ps: 你检查下SPI 模式是否符合器件支持的那两种。GD32的SPI是从索引0开始标