stm32f03单片机spi初始化配置问题 -

标题: stm32f03单片机spi初始化配置问题 [打印本页]

作者: Newbe 时间: 2017-12-11 14:38
标题: stm32f03单片机spi初始化配置问题
时钟配置:
void RC_Configuration()
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1,ENABLE);//使能SPI_1时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);//使能GPIOA时钟
}

gpio配置:
void SPI_GPIO_Configuration()
{
GPIO_InitTypeDef  GPIO_InitStructure;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA,&GPIO_InitStructure);

/*片选*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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(GPIOA,&GPIO_InitStructure);
}

spi配置:
void SPI_Configuration(void)
{
//SPI_1串口参数部分定义，SPI_1参数为时钟平时为低，上升沿采样
SPI_InitTypeDef  SPI_InitStructure;

//SPI1同步参数初始化定义
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
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_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1,&SPI_InitStructure);

SPI_RxFIFOThresholdConfig(SPI1,SPI_RxFIFOThreshold_QF);
SPI_Cmd(SPI1,ENABLE);
//SPI_CalculateCRC(SPI1, DISABLE);
}

以上配置,sck,mosi和miso引脚信号用示波器量都是一样的杂信号,是配置哪里出错了吗?
原理图上gpio引脚都没有复用,如下:

作者: Newbe 时间: 2017-12-11 14:49

测试信号是这样的

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