现在在做一个定时器的测试程序，要用定时器2定时1秒，中断中翻转IO口，改变指示灯状态。下面是我的程序：
#define ENCODER_TIM_PERIOD (u16) 13999
#define TIMx_Channel TIM2_IRQn
#define TIMx_PRE_EMPTION_PRIORITY 0
#define TIMx_SUB_PRIORITY 1
///////////////////////////////
//u8 Port[1];//PCA9554D的端口
u8 act[5][10];//保存A,B,C,共补的电容器投切状态。
u8 counter;//临时程序试验用计数变量。
GPIO_InitTypeDef GPIO_InitStructure;
/* Private function prototypes -----------------------------------------------*/
void Switch_Twel(u8 flag );//正负12V输出电压转换及关闭prototypes
u8 Relay_Drive(u8 X,u8 Z);
void Relay_ALL_Leave(void);//切掉全部电容器。
/////////////////////////////////////////////////////////////
/* Private functions ---------------------------------------------------------*/
void Delay100ms(void)
{
u32 cnt=0x00020000;
while(cnt--);//延时105ms
}
void GPIO_Ini(void)
{
/* GPIOA/GPIOB Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB, ENABLE);
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
__NOP();
/* Configure PA8,PA0 ,PA12 in output pushpull mode *///指示灯控制
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_0|GPIO_Pin_12;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
__NOP();
/* Configure PB11,PB10 in output pushpull mode ，正负12V的电源转换
*/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_10;
//GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_10;//positive and negive 12voltage output
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
__NOP();
GPIO_ResetBits(GPIOA,GPIO_Pin_12);//双向可控硅的所有驱动输入皆为低电平。
GPIO_SetBits(GPIOA,GPIO_Pin_8);//关闭指示灯。
}
void timer2_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* TIM2clock source enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = TIMx_Channel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Timer configuration in Encoder mode */
TIM_DeInit(TIM2);
TIM_TimeBaseStructure.TIM_Prescaler = 1999; // APB2=72M 72M/(71+1)=1M
TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD; //count 100 reset to 0
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2 , &TIM_TimeBaseStructure);
//使能预装载
TIM_ARRPreloadConfig(TIM2, ENABLE);
//TIM_GenerateEvent(TIM1, TIM_EventSource_Update);
// Clear all pending interrupts
TIM_ClearFlag(TIM2 , TIM_FLAG_Update);
TIM_ClearITPendingBit(TIM2 , TIM_IT_Update);
//enable interrupt
TIM_ITConfig(TIM2 , TIM_IT_Update, ENABLE);
//TIM_Cmd(TIM1, ENABLE);
TIM_Cmd(TIM2,ENABLE);
//TIM_CtrlPWMOutputs(TIM1, ENABLE);
}
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
SystemInit(); // 使用外部8MHZ的晶振，系统时钟改为56MHZ，高速外围56，低俗28MHZ。
GPIO_Ini();
//I2C_EE_Init();
//PCA9554D_Init();//initialize the PCA9554D as the output ,and all output hign level.
timer2_Init();
//u32 cnt=0x0009ffff;
while (1)
{;}
}
现在的问题是，一运行程序，就进入中断文件里面的硬件出错部分：
void HardFault_Handler(void)
{
__IO u32 ReturnAddr;
ReturnAddr = __get_MSP();
ReturnAddr = *(u32 *)(ReturnAddr+32);
/* Go to infinite loop when Hard Fault exception occurs */
while (1)
{
}
}
单步执行，发现在timer2_Init();里面执行TIM_Cmd(TIM2,ENABLE);之后，在
void TIM_Cmd(TIM_TypeDef* TIMx, FunctionalState NewState)
{
/* Check the parameters */
assert_param(IS_TIM_ALL_PERIPH(TIMx));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if (NewState != DISABLE)
{
/* Enable the TIM Counter */
TIMx->CR1 |= TIM_CR1_CEN; }
else
{
/* Disable the TIM Counter */
TIMx->CR1 &= (uint16_t)(~((uint16_t)TIM_CR1_CEN));
}
}
当返回主程序的时候出错。不知道是为什么。
我是刚开始学习STM32F103R8T6，也是第一次接触STM单片机。希望版主、做过的朋友，帮我找找问题，看看怎么回事。十分感谢！ |
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