整段代码贴上来，寻求帮助。
void BSP_Init(void)
{
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration -----------------------------*/
/* 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)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, 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)
{
}
}
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_BKP|RCC_APB1Periph_PWR,ENABLE);
PWR_BackupAccessCmd(ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |RCC_APB2Periph_GPIOC
| RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE
| RCC_APB2Periph_AFIO, ENABLE);
GPIO_PinRemapConfig( GPIO_Remap_SWJ_JTAGDisable , ENABLE );
GPIO_Config();
SysTick_Config();
}
static void SysTick_Config(void)
{
RCC_ClocksTypeDef rcc_clocks;
unsigned long cnts;
RCC_GetClocksFreq(&rcc_clocks);
cnts = (unsigned long)rcc_clocks.HCLK_Frequency/1000;
SysTick_SetReload(cnts);
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
SysTick_CounterCmd(SysTick_Counter_Enable);
SysTick_ITConfig(ENABLE);
}
int main(void)
{
u32 i;
u8 flag=0;
BSP_Init();
GPIO_SetBits(GPIOA, GPIO_Pin_14);
GPIO_SetBits(GPIOB, GPIO_Pin_7);
// LIS33_Configuration();
SPI_LIS33_CS_LOW();
while(1)
{
// Parse_Lis33();
SPI_LIS33_CS_HIGH();
GPIO_SetBits(GPIOA, GPIO_Pin_All);
for(i=0;i<100000*100;i++)
;
SPI_LIS33_CS_LOW();
GPIO_ResetBits(GPIOA, GPIO_Pin_All);
if(flag==0)
{
GPIO_ResetBits(GPIOC,GPIO_Pin_5);
flag=1;
}
else
{
GPIO_SetBits(GPIOC, GPIO_Pin_5);
flag=0;
}
}
return 1;
}
void GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_Init(GPIOC,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
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