请教各位高手，
STM32L151CBT6 为什么只能下载烧写一次程序，
焊了2块线路板，换了3次CPU，仿真器用的是J-LINK.
每次只能是第一次烧程序可以写入，PA8输出系统时钟 SYSCLK，可以用示波器看到正确配置的时钟输出，然后就再也写不进程序了。
程序只先写了一部分，很简单，如下，
急啊！！！！！！！！
int main(void)
{
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 2000);
init_used_pin(); // 初始化管脚
while (1)
{ DZ_LED_1;
POWER_LED_1;
Delay_us(20000); // 延时us
POWER_LED_0;
DZ_LED_0;
}
}
void init_used_pin(void) // 初始化管脚
{ GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); // 使能GPIOA 时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); // 使能GPIOB 时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All; // 指定管脚
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz; // 管脚输出的速度：400KHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; // 管脚工作模式:输出
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; // 推挽方式输出 还是 集电极开路方式输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 输入时上(下)拉状态:上拉
//////// PA所有管脚 开漏输出 ///////////
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA, GPIO_Pin_All);
//////// PB所有管脚 开漏输出 ///////////
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_ResetBits(GPIOB, GPIO_Pin_All);
/// Output the system clock on MCO pin (PA.08) ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_MCOConfig(RCC_MCOSource_SYSCLK, RCC_MCODiv_1); // MCO输出系统时钟 SYSCLK
/// 电源指示LED(PA4), 动作LED(PA3) ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4; // 指定管脚
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz; // 管脚输出的速度：400KHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; // 管脚工作模式:输出
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽方式输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 输入时上(下)拉状态:上拉
GPIO_Init(GPIOA, &GPIO_InitStructure);
/// 电压信号（模拟量）输入：PA6 ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; // 指定管脚
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz; // 管脚输出的速度：40MHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; // 管脚工作模式:模拟输入
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽方式输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // 输入时上(下)拉状态:既不上拉，也不下拉
GPIO_Init(GPIOA, &GPIO_InitStructure);
/// 驱动光耦动作 PB6 ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; // 指定管脚
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz; // 管脚输出的速度：400KHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; // 管脚工作模式:输出
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽方式输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 输入时上(下)拉状态:上拉
GPIO_Init(GPIOB, &GPIO_InitStructure);
/// 1S输入(PB14), 2S输入(PB12), 3S输入(PB13) ///
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14; // 指定管脚
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_400KHz; // 管脚输出的速度：400KHz
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; // 管脚工作模式:输入
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; // 推挽方式输出
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; // 输入时上(下)拉状态:上拉
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
我是直接copy 模板STM32L1xx_StdPeriph_Template的
时钟配置由STM32L1xx_Clock_Configuration_V1.0.0.excel生成的
void SystemInit (void)
{
/*!< Set MSION bit */
RCC->CR |= (uint32_t)0x00000100;
/*!< Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits */
RCC->CFGR &= (uint32_t)0x88FFC00C;
/*!< Reset HSION, HSEON, CSSON and PLLON bits */
RCC->CR &= (uint32_t)0xEEFEFFFE;
/*!< Reset HSEBYP bit */
RCC->CR &= (uint32_t)0xFFFBFFFF;
/*!< Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits */
RCC->CFGR &= (uint32_t)0xFF02FFFF;
/*!< Disable all interrupts */
RCC->CIR = 0x00000000;
/* Configure the System clock frequency, AHB/APBx prescalers and Flash settings */
SetSysClock();
#ifdef VECT_TAB_SRAM
SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
#else
SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
#endif
}
static void SetSysClock(void)
{
__IO uint32_t StartUpCounter = 0, HSIStatus = 0;
/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/
/* Enable HSI */
RCC->CR |= ((uint32_t)RCC_CR_HSION);
/* Wait till HSI is ready and if Time out is reached exit */
do
{
HSIStatus = RCC->CR & RCC_CR_HSIRDY;
} while((HSIStatus == 0) && (StartUpCounter != HSI_STARTUP_TIMEOUT));
if ((RCC->CR & RCC_CR_HSIRDY) != RESET)
{
HSIStatus = (uint32_t)0x01;
}
else
{
HSIStatus = (uint32_t)0x00;
}
if (HSIStatus == (uint32_t)0x01)
{
/* Flash 0 wait state */
FLASH->ACR &= ~FLASH_ACR_LATENCY;
/* Disable Prefetch Buffer */
FLASH->ACR &= ~FLASH_ACR_PRFTEN;
/* Disable 64-bit access */
FLASH->ACR &= ~FLASH_ACR_ACC64;
/* Power enable */
RCC->APB1ENR |= RCC_APB1ENR_PWREN;
/* Select the Voltage Range 1 (1.8 V) */
PWR->CR = PWR_CR_VOS_0;
/* Wait Until the Voltage Regulator is ready */
while((PWR->CSR & PWR_CSR_VOSF) != RESET)
{
}
/* HCLK = SYSCLK /4*/
RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV4;
/* PCLK2 = HCLK /1*/
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1;
/* PCLK1 = HCLK /1*/
RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1;
/* Select HSI as system clock source */
RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW));
RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSI;
/* Wait till HSI is used as system clock source */
while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_HSI)
{
}
}
else
{
/* If HSI fails to start-up, the application will have wrong clock
configuration. User can add here some code to deal with this error */
}
} |
楼主
标题置顶
标题高亮
