TC275 配置ICU进行PWM采集

1. 配置对应的Port

将硬件对应Port 配置成GPIO输入即可

2. 根据PORT找到对应的TIN号

这里是TIN109

3. 根据TIN号选择TIM 通道

在手册TIM模块中，找到对应的TIN通道号，确定允许映射的TIM通道，注意在手册中包含多种封装的映射表，请首先确认映射表的封装是否正确

4. TIM时钟源配置

TIM的时钟源来自于CMU_CLK，同时通过CLK_SEL进行分频。

一共有8种分频选择

4.1 TIM时钟源频率计算

TIM属于GTM模块，整个GTM模块的时钟是有CMU分配，同时GTM模块的时钟源一共有两个来源

1. GTM
2. SPB
   
   GTM 与SPB的时钟定义在MCU模块
   
   
   根据配置可知，GTM SPB的时钟频率都是100M

在查看CMU的配置,CMU选择了CMU_CLOCK_0作为时钟，因此CMU_CLK的时钟频率为100M/(15+1)

TIM对应通道的时钟分频是CLOCK_0，因此最终的时钟频率是6.25M

5. ICU配置

ICU配置，只需要选择对应的边沿以及测量模式，同时关联对应的TIM通道

6. 实现代码

截取部分代码如下

void IoHwAb_Icu_MainFcuntion(void)
{
    Icu_ChannelType eChannel = {0,0};
    Icu_17_GtmCcu6_InputStateType eInputState = ICU_IDLE;
    IoHwAb_Icu_SampleParamType ChannelSampleParam = {0,0};
	Icu_17_GtmCcu6_DutyCycleType  DutyCycle = {0x0};
    uint8 *pChannelState =0;
    uint8 *pIdleCnt = 0;
    QueueStructType *pQueuePtr = NULL_PTR;
    Icu_Queue_EleType *pChannelSampleParam = NULL_PTR;
    for (uint8 uiChCnt =0; uiChCnt<IoHwAb_Icu_Channel_MAX; uiChCnt++)
    {
        pChannelState = &g_FsmStateGroup[uiChCnt]; /* 获取通道的工作状态 */
        eChannel = g_IcuChannelTbl[uiChCnt];       /*  获取ICU通道号 */
        pIdleCnt = &Icu_ChannelIdleCnt[uiChCnt];
        pQueuePtr = &Icu_ChannelFilterQueue[uiChCnt];
        pChannelSampleParam = &g_ChannelSampleParam[uiChCnt];
        switch (*pChannelState)
        {
            case 0: /* IDLE */
				Icu_17_GtmCcu6_StartSignalMeasurement(eChannel.Icu_Channel);
				*pChannelState = 1;
				break;
            case 1: /* 开始采集 */
				eInputState =  Icu_17_GtmCcu6_GetInputState(eChannel.Icu_Channel);
				if(eInputState == ICU_ACTIVE)
				{
					*pChannelState = 2;   /* 激活状态，获取采集结果*/
					(*pIdleCnt) = 0;
				}
				else
				{
					(*pIdleCnt)++;
					if(*pIdleCnt >= ICU_IDLE_MAX)
					{
						*pIdleCnt = ICU_IDLE_MAX;
						ChannelSampleParam.uiDuty  = (uint16)Dio_ReadChannel(eChannel.Dio_Channel)*1000;
						ChannelSampleParam.uiFreq = 0;
						Icu_Queue_Push(pQueuePtr,ChannelSampleParam);
						*pChannelSampleParam = IoHwAb_Icu_GetQueueFilterResult(pQueuePtr);
					}
				}
				break;
            case 2: /* 检测采集是否完成 */
				Icu_17_GtmCcu6_GetDutyCycleValues(eChannel.Icu_Channel, &DutyCycle);
				if(DutyCycle.PeriodTime !=0)
				{
					ChannelSampleParam.uiFreq = ICU_CLOCK_FREQ/DutyCycle.PeriodTime;
					ChannelSampleParam.uiDuty  = ((float)(DutyCycle.ActiveTime))/((float)(DutyCycle.PeriodTime))*1000;
					Icu_Queue_Push(pQueuePtr,ChannelSampleParam);
				}
				*pChannelState = 3;
            	break;
            case 3:
            	Icu_17_GtmCcu6_StopSignalMeasurement(eChannel.Icu_Channel);
            	*pChannelSampleParam = IoHwAb_Icu_GetQueueFilterResult(pQueuePtr);
				*pChannelState = 0;
            	break;
            default:
				*pChannelState = 0;
				break;

        }
    }    
}