【MCXN947开发板测评】PAD功能测试

jennyzhaojie

【MCXN947开发板测评】PAD功能测试 [复制链接]

在MCXN947开发板上配有一个触摸键，其电路如图1所示。

 

图1 触摸电路

 

相应的可以在网上查找到它的示例程序，其主程序的内容如下：

int main(void)
{
    volatile uint32_t i = 0;
    tsi_selfCap_config_t tsiConfig_selfCap;
    lptmr_config_t lptmrConfig;
    memset((void *)&lptmrConfig, 0, sizeof(lptmrConfig));
    CLOCK_EnableClock(kCLOCK_InputMux0);
    CLOCK_SetClkDiv(kCLOCK_DivFlexcom4Clk, 1u);
    CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH);
    CLOCK_SetupClk16KClocking(kCLOCK_Clk16KToVsys);
    CLOCK_SetClkDiv(kCLOCK_DivTsiClk, 1u);
    CLOCK_AttachClk(kCLK_IN_to_TSI);
    BOARD_InitPins();
    BOARD_InitBootClocks();
    BOARD_InitDebugConsole();
    LED1_INIT();
    LED2_INIT();
    LPTMR_GetDefaultConfig(&lptmrConfig);
    TSI_GetSelfCapModeDefaultConfig(&tsiConfig_selfCap);
    LPTMR_Init(LPTMR0, &lptmrConfig);
    TSI_InitSelfCapMode(APP_TSI, &tsiConfig_selfCap);
    TSI_EnableNoiseCancellation(APP_TSI, true);
    LPTMR_SetTimerPeriod(LPTMR0, USEC_TO_COUNT(LPTMR_USEC_COUNT, LPTMR_SOURCE_CLOCK));
    NVIC_EnableIRQ(TSI0_IRQn);
    TSI_EnableModule(APP_TSI, true); 
    PRINTF("\r\nTSI_V6 Self-Cap mode Example Start!\r\n");
    memset((void *)&buffer, 0, sizeof(buffer));
    TSI_SelfCapCalibrate(APP_TSI, &buffer);
    for (i = 0U; i < FSL_FEATURE_TSI_CHANNEL_COUNT; i++)
    {
        PRINTF("Calibrated counters for channel %d is: %d \r\n", i, buffer.calibratedData[i]);
    }
    PRINTF("\r\nNOW, comes to the software trigger scan using polling method!\r\n");
    TSI_EnableHardwareTriggerScan(APP_TSI, false); /* Enable software trigger scan */
    TSI_DisableInterrupts(APP_TSI, kTSI_EndOfScanInterruptEnable);
    TSI_ClearStatusFlags(APP_TSI, kTSI_EndOfScanFlag);
    TSI_SetSelfCapMeasuredChannel(APP_TSI, BOARD_TSI_ELECTRODE_1);
    TSI_StartSoftwareTrigger(APP_TSI);
    while (!(TSI_GetStatusFlags(APP_TSI) & kTSI_EndOfScanFlag))
    {
    }
    PRINTF("Channel %d Normal mode counter is: %d \r\n", BOARD_TSI_ELECTRODE_1, TSI_GetCounter(APP_TSI));
#if (defined(PAD_TSI_ELECTRODE_2_ENABLED) && PAD_TSI_ELECTRODE_2_ENABLED)
    TSI_ClearStatusFlags(APP_TSI, kTSI_EndOfScanFlag);
    TSI_SetSelfCapMeasuredChannel(APP_TSI, BOARD_TSI_ELECTRODE_2);
    TSI_StartSoftwareTrigger(APP_TSI);
    while (!(TSI_GetStatusFlags(APP_TSI) & kTSI_EndOfScanFlag))
    {
    }
    PRINTF("Channel %d Normal mode counter is: %d \r\n", BOARD_TSI_ELECTRODE_2, TSI_GetCounter(APP_TSI));
#endif
    TSI_ClearStatusFlags(APP_TSI, kTSI_EndOfScanFlag | kTSI_OutOfRangeFlag);
    PRINTF("\r\nNOW, comes to the software trigger scan using interrupt method!\r\n");
    TSI_EnableInterrupts(APP_TSI, kTSI_GlobalInterruptEnable);
    TSI_EnableInterrupts(APP_TSI, kTSI_EndOfScanInterruptEnable);
    TSI_ClearStatusFlags(APP_TSI, kTSI_EndOfScanFlag);
    TSI_SetSelfCapMeasuredChannel(APP_TSI, BOARD_TSI_ELECTRODE_1);
    while (s_tsiInProgress)
    {
        TSI_StartSoftwareTrigger(APP_TSI);
    }
    s_tsiInProgress = true;
    PRINTF("Channel %d Normal mode counter is: %d \r\n", BOARD_TSI_ELECTRODE_1, TSI_GetCounter(APP_TSI));
#if (defined(PAD_TSI_ELECTRODE_2_ENABLED) && PAD_TSI_ELECTRODE_2_ENABLED)
    TSI_SetSelfCapMeasuredChannel(APP_TSI, BOARD_TSI_ELECTRODE_2);
    TSI_StartSoftwareTrigger(APP_TSI);
    while (s_tsiInProgress)
    {
        TSI_StartSoftwareTrigger(APP_TSI);
    }
    PRINTF("Channel %d Normal mode counter is: %d \r\n", BOARD_TSI_ELECTRODE_2, TSI_GetCounter(APP_TSI));
#endif
    PRINTF("\r\nNOW, comes to the hardware trigger scan method!\r\n");
    PRINTF("After running, touch pad %s each time, you will see LED toggles.\r\n", PAD_TSI_ELECTRODE_1_NAME);
    TSI_EnableModule(APP_TSI, false);
    TSI_EnableHardwareTriggerScan(APP_TSI, true);
    TSI_EnableInterrupts(APP_TSI, kTSI_EndOfScanInterruptEnable);
    TSI_ClearStatusFlags(APP_TSI, kTSI_EndOfScanFlag);

    TSI_SetSelfCapMeasuredChannel(APP_TSI, BOARD_TSI_ELECTRODE_1); 
    TSI_EnableModule(APP_TSI, true);
    INPUTMUX_AttachSignal(INPUTMUX0, 0U, kINPUTMUX_Lptmr0ToTsiTrigger);
    LPTMR_StartTimer(LPTMR0); 
    while (1)
    {
    }
}

 

相应的中断服务程序是：

void TSI0_IRQHandler(void)
{
#if BOARD_TSI_ELECTRODE_1 > 15
    if ((TSI_GetSelfCapMeasuredChannel(APP_TSI) | 0x10U) == BOARD_TSI_ELECTRODE_1)
#else
    if (TSI_GetSelfCapMeasuredChannel(APP_TSI) == BOARD_TSI_ELECTRODE_1)
#endif
    {
        if (TSI_GetCounter(APP_TSI) > (uint16_t)(buffer.calibratedData[BOARD_TSI_ELECTRODE_1] + TOUCH_DELTA_VALUE))
        {
            LED1_TOGGLE(); 
            s_tsiInProgress = false;
        }
    }
    TSI_ClearStatusFlags(APP_TSI, kTSI_EndOfScanFlag);
    SDK_ISR_EXIT_BARRIER;
}

 

由此可知，当触摸PAD键时，会启动中断服务，即蓝色LED的状态被翻转一次，见图2和图3所示。

在连接串口的情况下，会见到图4的输出内容。

 

图2 熄灭状态

 

 

图3 点亮状态

 

 

图4 串口输出信息