STM32 SPI1 通讯

只看该作者 · 2009-12-4 16:42

SPI1驱动如下：
void SPI_LIS33_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef  SPI_InitStructure;
/* Enable SPI1 and GPIOA clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);
/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
//  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
//  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
//  GPIO_Init(GPIOA, &GPIO_InitStructure);
SPI_LIS33_CS_HIGH();
/* SPI1 configuration */
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_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI1  */
SPI_Cmd(SPI1, ENABLE);
}
在用示波器测量时，miso和mosi均没有信号，读出来的值要么全是零，要么全是255.请大家帮帮忙分析一下。

只看该作者 · 2009-12-4 18:13

只看该作者 · 2009-12-5 20:53

高手帮下吧，我是来学习的，这段代码对于我很有参考价值

1万 · 2009-12-6 00:19

别着急，慢慢来:)

只看该作者 · 2009-12-7 11:05

不能慢慢来啊。已经急死我了。。。:'(

只看该作者 · 2011-5-4 17:01

什么情况啊我也碰到了:'(

只看该作者 · 2011-5-5 13:11

void SPI_Configuration(void)
{
SPI_InitTypeDef SPI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure); //PA5-SCK1,PA6-MISO1,PA7-MOSI1为推挽复用输出

/* 1 bit for pre-emption priority, 3 bits for subpriority */
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);

NVIC_InitStructure.NVIC_IRQChannel = SPI1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;
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_64;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);

SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_TXE, DISABLE);
SPI_I2S_ITConfig(SPI1, SPI_I2S_IT_RXNE, DISABLE);
SPI_Cmd(SPI1, ENABLE);
}

只看该作者 · 2011-5-5 14:21

AFIO开了没....

只看该作者 · 2011-5-5 14:54

“在用示波器测量时，miso和mosi均没有信号，读出来的值要么全是零，要么全是255.请大家帮帮忙分析一下”
你是怎么读的？

STM32 SPI1 通讯

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