我做STM32和STC12LE5412的SPI通讯，STM32在接受到USART1发出的0x55后就连续发送20个字节，但是在发送第一个字节的时候要将NSS拉低（NSS脚被软件配置为用户自用），接着将剩余的19个字节发送出去。STM32为主，STC12为从。
我的程序如下，结果是STC12可以正确的收到STM32发出的数据，但是STM32接受不到STC12的数据。请高手帮帮看看我的程序是不是有问题。STC12的软件硬件设置都可以保证没有问题。谢谢了！！
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "stdio.h"
/* Local includes ------------------------------------------------------------*/
/* Private typedef -----------------------------------------------------------*/
/* Private define --------------------------------------------------*/
#define BufferSize 20
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
u8 SPI1_Buffer_Tx[BufferSize] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20};
u8 SPI1_Buffer_Rx[BufferSize]={};
ErrorStatus HSEStartUpStatus;
/* Private functions ---------------------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void USART_Configuration(void) ;
void SPI_Configuration(void) ;
void Delay(vu32 nCount)
{
for(; nCount != 0; nCount--);
}
void SPI1_SUB(void)
{
u8 i;
USART_ClearFlag(USART1,USART_FLAG_RXNE);
GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_RESET); //设置联系线为低电平 NSS
SPI_SendData(SPI1,SPI1_Buffer_Tx[0]); //SPI1发送第一个数据；
while(SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE)==RESET) //等待，直到SPI1数据发送完毕
while(SPI_GetFlagStatus(SPI1,SPI_FLAG_RXNE)==RESET) //等待，直到SPI1接受到数据
SPI1_Buffer_Rx[0]=SPI_ReceiveData(SPI1); //将数据放入缓冲区
USART_SendData(USART1,SPI1_Buffer_Rx[0]);
Delay(200);//保证联系信号持续时间足够
GPIO_WriteBit(GPIOA, GPIO_Pin_4, Bit_SET); // 恢复联系线
for(i=19;i>0;i--) //发送剩余的19个数据，接受和发送的过程如上
{
SPI_SendData(SPI1,SPI1_Buffer_Tx[20-i]);
while(SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE)==RESET)
while(SPI_GetFlagStatus(SPI1,SPI_FLAG_RXNE)==RESET)
SPI1_Buffer_Rx[20-i]=*(vu32 *)SPI1_DR_Address;
USART_SendData(USART1,SPI1_Buffer_Rx[20-i]);
}
}
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
/* System clocks configuration ---------------------------------------------*/
RCC_Configuration();
/* NVIC configuration ------------------------------------------------------*/
NVIC_Configuration();
/* GPIO configuration ------------------------------------------------------*/
GPIO_Configuration();
/* 通用串口设置*/
USART_Configuration();
SPI_Configuration();
USART_Cmd(USART1, ENABLE);
/* Enable SPI1 */
SPI_CalculateCRC(SPI1,DISABLE); //不需要校验
SPI_Cmd(SPI1, ENABLE);
while(1)
{
if(USART_GetFlagStatus(USART1,USART_FLAG_RXNE)) //当从USART接受到0x55后传输数据
{
SPI1_SUB();
}
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
/* RCC system reset(for debug purpose) */
RCC_DeInit();
/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* HCLK = SYSCLK =36MHZ*/
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK=36MHZ */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 =18MHZ*/
RCC_PCLK1Config(RCC_HCLK_Div2);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/*系统时钟36MK PLLCLK = 4MHz * 9 = 36MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div2, RCC_PLLMul_9);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
/* GPIOA, GPIOB and SPI1 clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 |RCC_APB2Periph_GPIOA |
RCC_APB2Periph_SPI1, ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Configure SPI1 pins: 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_4;//配置NSS脚为联系线
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 配置PA10位USART1的接收引脚 ，50MHZ*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 配置PA9为USART1的发送引脚 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configure the nested vectored interrupt controller.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
/* 2 bit for pre-emption priority, 3 bits for subpriority */
}
/*******************************************************************************
* Function Name : SPI_Configuration
* Description : Configures the different SPI.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SPI_Configuration(void)
{
/* SPI1 configuration ------------------------------------------------------*/
SPI_InitTypeDef SPI_InitStructure;
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_64;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStructure);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : 设置串口.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void USART_Configuration(void)
{
/*9600波特，8数据位，1停止位，无校验位，全双工通讯。*/
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode =USART_Mode_Rx | USART_Mode_Tx;
USART_InitStructure.USART_Clock = USART_Clock_Disable;
USART_InitStructure.USART_CPOL = USART_CPOL_Low;
USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
/* Configure USART1 */
USART_Init(USART1, &USART_InitStructure);
/* Configure USART1 */
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert error has occurred.
* Input : - file: pointer to the source file name
* - line: assert error line source number
* Output : None
* Return : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d
", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif |
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