SPIx->DR = Data; 写不进去是什么原因

alangada · 发表于 2015-10-28 17:01:19

[mw_shl_code=c,true]void SPI2_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; SPI_InitTypeDef SPI_InitStructure; RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE );//PORTB?±?????? RCC_APB1PeriphClockCmd( RCC_APB1Periph_SPI2, ENABLE );//SPI2?±?????? GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //PB13/14/15???????ì???? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure);//??????GPIOB GPIO_SetBits(GPIOB,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); //PB13/14/15???? SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex; //?è??SPI???ò?ò?????ò??????????:SPI?è???????????ò?????¤ SPI_InitStructure.SPI_Mode = SPI_Mode_Master; //?è??SPI?¤×÷????:?è?????÷SPI SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b; //?è??SPI???????ó??:SPI·???????8?????á?? SPI_InitStructure.SPI_CPOL = SPI_CPOL_High; //?®???????±????????×??????????? SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge; //?®???????±????????????±????¨?????ò?????©????±????ù SPI_InitStructure.SPI_NSS = SPI_NSS_Soft; //NSS???????????¨NSS?????©?????í???¨????SSI???©???í:????NSS??????SSI?????? SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256; //?¨???¨?????¤·???????:?¨?????¤·???????256 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB; //???¨??????????MSB??????LSB??????:??????????MSB?????? SPI_InitStructure.SPI_CRCPolynomial = 7; //CRC?????????à???? SPI_Init(SPI2, &SPI_InitStructure); //?ù??SPI_InitStruct?????¨???????????????èSPIx?????÷ SPI_Cmd(SPI2, ENABLE); //????SPI???è SPI2_ReadWriteByte(0xff);//???????? } [/mw_shl_code]