使用CH579的TMR例程，將PB15設置為下拉輸入后，即使外部引腳懸空也讀出1，PB14 13 12 也是如此。而其他引腳卻一切正常。#include?"CH57x_common.h"

__align(4)?UINT32?CapBuf[100];
__align(4)?UINT32?PwmBuf[100];

volatile?UINT8?capFlag?=?0;

void?DebugInit(void)		
{
????GPIOA_SetBits(GPIO_Pin_9);
????GPIOA_ModeCfg(GPIO_Pin_8,?GPIO_ModeIN_PU);
????GPIOA_ModeCfg(GPIO_Pin_9,?GPIO_ModeOut_PP_5mA);
????UART1_DefInit();
}

int?main()
{?????
????UINT8??i;
		UINT32?x?=?0;
??
/*?配置串口調試?*/???
????DebugInit();
????PRINT(?"Start?@ChipID=%02X\n",?R8_CHIP_ID?);
????
????//設置GPIO為下拉，輸出結果
????GPIOB_ModeCfg(?GPIO_Pin_15,?GPIO_ModeIN_PD?);
????PRINT("read?res?=?%d\r\n",?GPIOB_ReadPortPin(?GPIO_Pin_15?));
????
#if?0???????/*?定時器0，設定100ms定時器進行IO口閃燈，?PB3-LED?*/
????
????GPIOB_SetBits(?GPIO_Pin_3?);
????GPIOB_ModeCfg(?GPIO_Pin_3,?GPIO_ModeOut_PP_5mA?);

????
????TMR0_TimerInit(?FREQ_SYS/10?);??????????????????//?設置定時時間?100ms
????TMR0_ITCfg(ENABLE,?TMR0_3_IT_CYC_END);??????????//?開啟中斷
????NVIC_EnableIRQ(?TMR0_IRQn?);

#endif?

#if?1???????/*?定時器3，PWM輸出?*/
????
????GPIOA_ResetBits(?GPIO_Pin_2?);????????????//?配置PWM口?PA2
????GPIOA_ModeCfg(?GPIO_Pin_2,?GPIO_ModeOut_PP_5mA?);
????
????TMR3_PWMInit(?High_Level,?PWM_Times_1?);
????TMR3_PWMCycleCfg(?3200?);????????//?周期?100us
????TMR3_Disable();
????TMR3_PWMActDataWidth(?1000?);??????????????//?占空比設置?,?修改占空比必須暫時關閉定時器
????TMR3_Enable();
????
#endif???

#if?1???????/*?定時器1，CAP捕捉，?*/
????PWR_UnitModCfg(?DISABLE,?UNIT_SYS_LSE?);?????//?注意此引腳是LSE晶振引腳，要保證關閉才能使用其他功能
????GPIOA_ResetBits(?GPIO_Pin_10?);?????????????//?配置PWM口?PA10
????GPIOA_ModeCfg(?GPIO_Pin_10,?GPIO_ModeIN_PU?);

????TMR1_CapInit(?Edge_To_Edge?);
????TMR1_CAPTimeoutCfg(?0xFFFFFFFF?);???//?設置捕捉超時時間
????TMR1_DMACfg(?ENABLE,?(UINT16)(UINT32)&CapBuf[0],?(UINT16)(UINT32)&CapBuf[100],?Mode_Single?);
????TMR1_ClearITFlag(?TMR1_2_IT_DMA_END?);??????//?清除中斷標志??
????TMR1_ITCfg(ENABLE,?TMR1_2_IT_DMA_END);??????????//?開啟DMA完成中斷
????NVIC_EnableIRQ(?TMR1_IRQn?);
????
????while(?capFlag?==?0?);
????capFlag?=?0;
????for(?i=0;?i<100;?i++?)
????{
????????printf("%08ld?",?CapBuf[i]&0x1ffffff);??????//?bit26?最高位表示?高電平還是低電平
????}printf("\n");

#endif
#if?1???????/*?定時器2，計數器?*/
		GPIOB_ModeCfg(?GPIO_Pin_11,?GPIO_ModeIN_PD?);
		GPIOPinRemap(?ENABLE,?RB_PIN_TMR2?);
		
		TMR2_CountInit(?FallEdge_To_FallEdge?);
		TMR2_CountOverflowCfg(?1000?);??????????????????//?設置計數上限1000
		
		/*?開啟計數溢出中斷，計慢1000個周期進入中斷?*/???
		TMR2_ClearITFlag(?TMR0_3_IT_CYC_END?);
		NVIC_EnableIRQ(TMR2_IRQn);
		TMR2_ITCfg(?ENABLE,?TMR0_3_IT_CYC_END);

		do
		{
						/*?約0.5s打印一次當前計數值，如果送入脈沖頻率較高，可能很快計數溢出，需要按實際情況修改?*/
				x++;
				if(?!(?x?&?0xfffff?)?)	printf("=%ld?",?TMR2_GetCurrentCount());			
		}while(1);?

#endif

#if?1?/*?定時器2,DMA?PWM.*/
????GPIOB_ModeCfg(GPIO_Pin_11,?GPIO_ModeOut_PP_5mA);
????GPIOPinRemap(ENABLE,?RB_PIN_TMR2);

????PRINT("TMR2?DMA?PWM\n");
????TMR2_PWMCycleCfg(120000);?//?周期?2000us
????for(i=0;?i<50;?i++)
????{
??????PwmBuf[i]=2400*i;
????}
????for(i=50;?i<100;?i++)
????{
??????PwmBuf[i]=2400*(100-i);
????}
????TMR2_PWMInit(Low_Level,?PWM_Times_16);
????/*?Note:?DMA須在PWM初始化后進行配置?*/
????TMR2_DMACfg(ENABLE,?(uint16_t)(uint32_t)&PwmBuf[0],?(uint16_t)(uint32_t)&PwmBuf[100],?Mode_LOOP);
????/*?開啟計數溢出中斷，計慢1000個周期進入中斷?*/
????TMR2_ClearITFlag(TMR1_2_IT_DMA_END);
????NVIC_EnableIRQ(TMR2_IRQn);
????TMR2_ITCfg(ENABLE,?TMR1_2_IT_DMA_END);

#endif

????while(1);????
}



void?TMR0_IRQHandler(?void?)????????//?TMR0?定時中斷
{
????if(?TMR0_GetITFlag(?TMR0_3_IT_CYC_END?)?)
????{
????????TMR0_ClearITFlag(?TMR0_3_IT_CYC_END?);??????//?清除中斷標志
????????GPIOB_InverseBits(?GPIO_Pin_3?);????????
????}
}

void?TMR1_IRQHandler(?void?)????????//?TMR1?定時中斷
{
????if(?TMR1_GetITFlag(?TMR1_2_IT_DMA_END?)?)
????{
????????TMR1_ITCfg(DISABLE,?TMR1_2_IT_DMA_END);???????//?使用單次DMA功能+中斷，注意完成后關閉此中斷使能，否則會一直上報中斷。
????????TMR1_ClearITFlag(?TMR1_2_IT_DMA_END?);??????//?清除中斷標志??
????????capFlag?=?1;
????????printf("*");
????}
}

void?TMR2_IRQHandler(void)
{
	if(?TMR2_GetITFlag(TMR0_3_IT_CYC_END)?)?
	{
		?TMR2_ClearITFlag(?TMR0_3_IT_CYC_END?);
		?/*?計數器計滿，硬件自動清零，重新開始計數?*/
		?/*?用戶可自行添加需要的處理?*/
	}
	if(TMR2_GetITFlag(TMR1_2_IT_DMA_END))
	{
			TMR2_ClearITFlag(TMR1_2_IT_DMA_END);
			PRINT("DMA?end\n");
			/*?DMA?結束?*/
			/*?用戶可自行添加需要的處理?*/
	}
}

您好579M的這幾個引腳與3V3直接相連所以導致上述現象