STM32F030与RC522SPI通讯

只看该作者 · 2016-6-22 22:41

void delay_ns(u32 ns)
{
  u32 i;
  for(i=0;i<ns;i++)
  {
__nop();
__nop();
__nop();
  }
}

void IC_Card_SPIInit(void)
{
SPI_InitTypeDef    SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); //¿ªÆôSPI1Ê±ÖÓ

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;  //PB0--RST PB1--NSS
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB,GPIO_Pin_0);
//GPIO_SetBits(GPIOB,GPIO_Pin_0|GPIO_Pin_1);

/*
*****************************************************************
* SPI½Ó¿Ú¶¨Òå,GPIOA.5--SCK  GPIOA.6--MISO  GPIOA.7--MOSI  GPIOB.0--RST GPIOB.1--NSS *
*****************************************************************
*/
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_0);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_0);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; //PA5/6/7¸´ÓÃ
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //PA5/6/7ÍÆÍìÊä³ö
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;//GPIO_PuPd_UP; //
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7); //PA5/6/7ÉÏÀ

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;    //ÉèÖÃSPIµ¥Ïò»òÕßË«ÏòµÄÊý¾ÝÄ£Ê½:SPIÉèÖÃÎªË«ÏßË«ÏòÈ«Ë«¹¤
SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //ÉèÖÃSPI¹¤×÷Ä£Ê½:ÉèÖÃÎªÖ÷SPI
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //ÉèÖÃSPIµÄÊý¾Ý´óÐ¡:SPI·¢ËÍ½ÓÊÕ8Î»Ö¡½á¹¹
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low; //´®ÐÐÍ¬²½Ê±ÖÓµÄ¿ÕÏÐ×´Ì¬ÎªµÍµçÆ½
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge; //´®ÐÐÍ¬²½Ê±ÖÓµÄµÚÒ»¸öÌø±äÑØ£¨ÉÏÉý»òÏÂ½µ£©Êý¾Ý±»²ÉÑù
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSSÐÅºÅÓÉÓ²¼þ£¨NSS¹Ü½Å£©»¹ÊÇÈí¼þ£¨Ê¹ÓÃSSIÎ»£©¹ÜÀí:ÄÚ²¿NSSÐÅºÅÓÐSSIÎ»¿ØÖÆ
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //¶¨Òå²¨ÌØÂÊÔ¤·ÖÆµµÄÖµ:²¨ÌØÂÊÔ¤·ÖÆµÖµÎª256
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //Ö¸¶¨Êý¾Ý´«Êä´ÓMSBÎ»»¹ÊÇLSBÎ»¿ªÊ¼:Êý¾Ý´«Êä´ÓMSBÎ»¿ªÊ¼
SPI_InitStructure.SPI_CRCPolynomial = 7; //CRCÖµ¼ÆËãµÄ¶àÏîÊ½
SPI_Init(SPI1, &SPI_InitStructure);  //¸ù¾ÝSPI_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õÊ¼»¯ÍâÉèSPIx¼Ä´æÆ÷

//SPI_RxFIFOThresholdConfig(SPI1, SPI_RxFIFOThreshold_QF);//ÅäÖÃ SPI µÄ FIFO ½ÓÊÕãÐÖµ(½ÓÊÕ8bits¾ÍÖÃ SPI_I2S_FLAG_RXNE)

SPI_Cmd(SPI1, ENABLE); //Ê¹ÄÜSPIÍâÉè
}