亚洲春色中文字幕久久久-三上亚,一吻二脱三床四吻胸,国产真实伦对白视频全集,在线毛片观看,精品成品入口黄网,国产毛aⅴ片久久久,亚洲AV色香蕉一区二区三区老师,萧皇后A级艳片,色情日本视频更新,99久久亚洲精品日本无码

標(biāo)題: Si4438如何拿到PART_INFO里的信息？附STM32單片機(jī)程序 [打印本頁]

作者: my854412644 時(shí)間: 2020-2-13 15:12
標(biāo)題: Si4438如何拿到PART_INFO里的信息？附STM32單片機(jī)程序
我用STM32F0xx通過SPI通信連接Si4438.
SPI已經(jīng)配置好了，發(fā)送PART_INFO指令到Si4438，但是返回的數(shù)據(jù)不對。請各位大神指導(dǎo)下，謝謝。

************Si4438函數(shù)****************************

void Si44xx_Wait_Cts(u8 cnt)
{
      u8 l_ReadCtsTimes = 0;
      SPI_CS_LOW();
      while(1)
      {
                     delay_us(2);
                     SPI_ExchangeByte( READ_CMD_BUFF );
                     if( SPI_ExchangeByte(0xFF)==0xFF )
                     {
                                    break;
                     }else if( cnt<l_ReadCtsTimes++ )
                     {
                                    break;
                     }
      }
      SPI_CS_HIGH();
}
void Si44xx_Write_Cmds( u8 *cmd, u8 len )
{
      Si44xx_Wait_Cts(2);
      SPI_CS_LOW();
      delay_us(2);
      while(len--)
      {
            SPI_ExchangeByte( *cmd );
            cmd++;
      }
      SPI_CS_HIGH();
      Si44xx_Wait_Cts(50);
}
void Si44xx_Read_Response( u8 *pRead, u8 Length )
{
      SPI_CS_LOW();
      delay_us(2);
      SPI_ExchangeByte( READ_CMD_BUFF );
      while( Length-- )
      {
                     *pRead = SPI_ExchangeByte( 0xFF );
                     pRead++;
      }
      SPI_CS_HIGH();
}

uint8_t Si44xx_Get_Device_Status( void )
{
      SI44xxCmd[0] = REQUEST_DEVICE_STATE;
      SI44xxCmd[1] = 0x00;
      SI44xxCmd[2] = 0x00;
      Si44xx_Write_Cmds( SI44xxCmd, 1 );
      Si44xx_Read_Response( SI44xxCmd, 3 );
      return (SI44xxCmd[1]&0x0F);
}

void SI446X_PART_INFO( u8 *buffer )
{
            u8 cmd = PART_INFO;
Si44xx_Write_Cmds( &cmd, 1 );
Si44xx_Read_Response( buffer, 8 );

}

**********************************************
**************SPI*****************************

uint8_t SPI_ExchangeByte( uint8_t TxByte )
{
      uint8_t l_Data = 0;
      uint16_t l_WaitTime = 0;

      while( RESET == SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) )             //等待發(fā)送緩沖區(qū)為空
      {
            if( SPI_WAIT_TIMEOUT == ++l_WaitTime )
            {
                     break;                      //如果等待超時(shí)則退出
            }
      }
      l_WaitTime = SPI_WAIT_TIMEOUT / 2;             //重新設(shè)置接收等待時(shí)間(因?yàn)镾PI的速度很快，正常情況下在發(fā)送完成之后會(huì)立即收到數(shù)據(jù)，等待時(shí)間不需要過長)
      SPI1->DR = TxByte;       //發(fā)送數(shù)據(jù)

      while( RESET == SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) )             //等待接收緩沖區(qū)非空
      {
            if( SPI_WAIT_TIMEOUT == ++l_WaitTime )
            {
                     break;                      //如果等待超時(shí)則退出
            }
      }

      l_Data = (uint8_t)SPI1->DR;             //讀取接收數(shù)據(jù)

      return l_Data;             //返回
}

*******************************************************************

作者: my854412644 時(shí)間: 2020-2-13 15:44
使用外部MCU控制Si4438無線收發(fā)器時(shí)，發(fā)現(xiàn)MCU讀取Si4438的芯片信息的值全是0xFF

歡迎光臨 (http://www.denmoz.com/bbs/)