STR912 定时器问题~~请大侠帮我看一下

只看该作者 · 2007-9-10 13:28

void SCU_Configuration(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
  TIM_InitTypeDef   TIM_InitStructure;
  UART_InitTypeDef UART_InitStructure;

/* SYSTEM CLOCK Configuration ------------------------------------------------*/
  //CPU = 25MHZ
  SCU_MCLKSourceConfig(SCU_MCLK_OSC);

  SCU_RCLKDivisorConfig(SCU_RCLK_Div8);
  SCU_HCLKDivisorConfig(SCU_HCLK_Div1);
  SCU_PCLKDivisorConfig(SCU_PCLK_Div1);
  SCU_BRCLKDivisorConfig(SCU_BRCLK_Div2); //24MHZ

  //PLL = 96MHz
  SCU_PLLCmd(DISABLE);
  SCU_PLLFactorsConfig(0xC0,0x19,0x2);
  SCU_PLLCmd(ENABLE);
  //CPU = 96MHZ
  SCU_MCLKSourceConfig(SCU_MCLK_PLL);

/* SYSTEM interrupt controller Configuration ------------------------------------------------*/
  SCU_AHBPeriphClockConfig(__VIC, ENABLE);
  SCU_APBPeriphReset(__VIC,DISABLE);
  VIC_DeInit();

/* TIMER Configuration -------------------------------------------------------*/
  /* TIM0 Deinitialization */
#if 1//定时器开关
  TIM_DeInit(TIM0);
  // Enable TIM0 clocks
  SCU_APBPeriphClockConfig(__TIM01, ENABLE);
  // Release TIM0 reset
  SCU_APBPeriphReset(__TIM01,DISABLE);
  // TIM Configuration in Output Compare Timing Mode period 100us
  TIM_InitStructure.TIM_Mode = TIM_OCM_CHANNEL_1;   // OUTPUT COMPARE CHANNEL 1 Mode
  TIM_InitStructure.TIM_OC1_Modes = TIM_TIMING;     // OCMP1 pin is disabled
  TIM_InitStructure.TIM_Clock_Source = TIM_CLK_APB; // assign PCLK to TIM_Clk
  TIM_InitStructure.TIM_Prescaler = 12 - 1;         // 1us resolution
  TIM_InitStructure.TIM_Pulse_Length_1 = 1000;       // 1 ms period
  TIM_Init(TIM0, &TIM_InitStructure);
  // VIC configuration
  VIC_Config(TIM0_ITLine, VIC_IRQ, TIM0_ITLine);
  //VIC_Config(TIM0_ITLine, VIC_IRQ, 0);
  VIC_ITCmd(TIM0_ITLine, ENABLE);
  /* Clear TIM0 ISR registers */
  TIM_ClearFlag(TIM0, TIM_FLAG_OC1| TIM_FLAG_OC2| TIM_FLAG_TO|TIM_FLAG_IC1|TIM_FLAG_IC2);
  /* Enable TIM0 IC1 interrupt */
  TIM_ITConfig(TIM0, TIM_IT_OC1, ENABLE);
  /* Start the counter of TIM0 */
  TIM_CounterCmd(TIM0, TIM_START);
  #endif

/* GPIO Configuration --------------------------------------------------------*/
  SCU_APBPeriphClockConfig(__GPIO3, ENABLE); /* Enable the clock for GPIO3 */
  GPIO_DeInit(GPIO3);                        /* GPIO3 Deinitialization */
  SCU_APBPeriphClockConfig(__GPIO5, ENABLE); /* Enable the clock for GPIO5 */
  GPIO_DeInit(GPIO5);

  GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All;//GPIO_Pin_0 |GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
  GPIO_InitStructure.GPIO_Alternate=GPIO_OutputAlt1;
  GPIO_Init (GPIO3, &GPIO_InitStructure);

  /*Gonfigure UART0_Rx pin GPIO5.1*/
  GPIO_InitStructure.GPIO_Direction = GPIO_PinInput;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
  GPIO_InitStructure.GPIO_IPConnected = GPIO_IPConnected_Enable;
  GPIO_InitStructure.GPIO_Alternate = GPIO_InputAlt1;
  GPIO_Init (GPIO5, &GPIO_InitStructure);
  /*Gonfigure UART0_Tx pin GPIO3.4*/
  GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
  GPIO_InitStructure.GPIO_Type = GPIO_Type_PushPull ;
  GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt3  ;
  GPIO_Init (GPIO3, &GPIO_InitStructure);

/* UART Configuration --------------------------------------------------------*/
  // Release reset and enable clock
  UART_DeInit(UART0);
  // Enable UART0 clocks
  SCU_APBPeriphClockConfig(__UART0, ENABLE);
  // Release UART0 reset
  SCU_APBPeriphReset(__UART0, DISABLE);

  UART_InitStructure.UART_WordLength = UART_WordLength_8D;
  UART_InitStructure.UART_StopBits = UART_StopBits_1;
  UART_InitStructure.UART_Parity = UART_Parity_No ;
  UART_InitStructure.UART_BaudRate = 115200;
  UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;
  UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;
  UART_InitStructure.UART_FIFO = UART_FIFO_Disable;
  UART_Init(UART0, &UART_InitStructure);
  UART_DMACmd(UART0,UART_DMAReq_Tx | UART_DMAReq_Rx, DISABLE);
  // Enable and configure the priority of the UART0 Update IRQ Channel
// VIC_Config(UART0_ITLine, VIC_IRQ, 14);
VIC_Config(UART0_ITLine, VIC_IRQ, 0);

  VIC_ITCmd(UART0_ITLine, ENABLE);
  /* Enable UART interrupt */
  UART_ITConfig(UART0, UART_IT_Receive, ENABLE);
  /* Enable the UART0 */
  UART_Cmd(UART0, ENABLE);

  // Enable the Interrupt controller to manage IRQ channel
  __enable_interrupt();
}

//定时器中断
void TIM0_IRQHandler(void)
{
          TIM0->CNTR=0;
        //TIM_CounterCmd(TIM0, TIM_START);
    /* Clear TIM0 ISR registers */
      TIM_ClearFlag(TIM0, TIM_FLAG_OC1);
}

//UART0 中断
void UART0_IRQHandler(void)
{
  unsigned char data1;

   data1 = UART_ReceiveData(UART0);
   UART_SendData(UART0, data1);  // resend received data

  /* Clear the UART0 Receive interrupt */
  UART_ClearITPendingBit(UART0, UART_IT_Receive);
}

当我定时器打开的时候,UART接收会收漏丢!如果,把定时器关了,就收得很正常~
谁帮我看一下,竟究是什么问题,谢谢!!!

只看该作者 · 2007-9-10 16:59

是不是我的定时器中断设置有问题?

只看该作者 · 2007-9-10 17:16

LZ还是说说你的时钟中断的频率和时钟中断里都做了什么事情，估计是你的时钟中断太频繁了或占用时间太长，造成UART的中断来不及相应；还有一种情况是UART中断中做的事情太多，UART中断又被时钟中断打断，造成UART中断处理不能正常完成。

只看该作者 · 2007-9-10 17:59

我的时钟中断大概10ms中断一次,时钟中断就清中断标记位,没有做其它东西了!UART 中断接到的数据,回传到PC机,也没做其它东西了~

//UART0 中断
void UART0_IRQHandler(void)
{
  unsigned char data1;
  __disable_interrupt();-->关中断
   data1 = UART_ReceiveData(UART0);
   UART_SendData(UART0, data1);  // resend received data

  /* Clear the UART0 Receive interrupt */
  UART_ClearITPendingBit(UART0, UART_IT_Receive);
__enable_interrupt();-->打开中断
}

//定时器中断
void TIM0_IRQHandler(void)
{
          TIM0->CNTR=0;
         /* Clear TIM0 ISR registers */
      TIM_ClearFlag(TIM0, TIM_FLAG_OC1);
}

只看该作者 · 2007-9-10 19:38

在开中断前请设置默认中断处理程序:
VIC0->DVAR = (UINT32)DFT_IRQHandler;
VIC1->DVAR = (UINT32)DFT_IRQHandler;

该defect是由于CPU与VIC间通讯速度造成的.ＳＴＲ９１２中断进入时间在10us以下(CPU CLK 96ＭHz) ．

只看该作者 · 2007-9-10 20:33

你在定时器中断只清除了一个中断标志，你是否能肯定只有一种条件可以产生定时器中断？如果不能肯定的话，你的定时器中断会不断地重复进入。

只看该作者 · 2007-9-11 11:24

你好

你运行的时候，UART0的"overrun bit"有没有变到1？

请问，为什么你用一个很低的频率（12Mhz)

Best Regards,
Stephane

只看该作者 · 2007-9-11 11:33

但是TIMO->SR 也清不了为0.奇怪!!!!

void TIM0_IRQHandler(void)
{
      __disable_interrupt();

              while ((TIM0->SR)!=0)
            {
                TIM0->SR = 0;
            }




      __enable_interrupt();
}