【MCXN947开发板测评】 P3T1755温度检测与显示

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【MCXN947开发板测评】 P3T1755温度检测与显示 [复制链接]

在MCXN947开发板上配有温度传感器P3T1755，该传感器以I2C的方式工作，其电路如图1所示。

 

图1 传感器电路

 

在连接串口的情况下，其检测结果如图2所示。

 

图2 检测结果

 

为便于观察，在配接LCD显示屏的情况下，其实现温度检测与显示的主程序是：

int main(void)
{
    status_t result = kStatus_Success;
    i3c_master_config_t masterConfig;
    p3t1755_config_t p3t1755Config;
    double temperature,d;
    gpio_pin_config_t led_config = {
        kGPIO_DigitalOutput,
        0,
    };
    CLOCK_SetClkDiv(kCLOCK_DivFlexcom4Clk, 1);
    CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH);
    CLOCK_EnableClock(kCLOCK_Gpio0);
    CLOCK_SetClkDiv(kCLOCK_DivI3c1FClk, 6U);
    CLOCK_AttachClk(kPLL0_to_I3C1FCLK);
    BOARD_InitPins();
    BOARD_InitBootClocks();
    BOARD_InitDebugConsole();
    GPIO_PinInit(GPIO0, 25U, &led_config);
    GPIO_PinInit(GPIO0, 26U, &led_config);
    GPIO_PinInit(GPIO0, 24U, &led_config);
    GPIO_PinInit(GPIO0, 27U, &led_config);
    GPIO_PinInit(GPIO0, 10U, &led_config);
    GPIO_PinInit(GPIO0, 28U, &led_config);
    PRINTF("\r\nI3C master read sensor data example.\r\n");
    I3C_MasterGetDefaultConfig(&masterConfig);
    masterConfig.baudRate_Hz.i2cBaud          = EXAMPLE_I2C_BAUDRATE;
    masterConfig.baudRate_Hz.i3cPushPullBaud  = EXAMPLE_I3C_PP_BAUDRATE;
    masterConfig.baudRate_Hz.i3cOpenDrainBaud = EXAMPLE_I3C_OD_BAUDRATE;
    masterConfig.enableOpenDrainStop          = false;
    masterConfig.disableTimeout               = true;
    I3C_MasterInit(EXAMPLE_MASTER, &masterConfig, I3C_MASTER_CLOCK_FREQUENCY);
    I3C_MasterTransferCreateHandle(EXAMPLE_MASTER, &g_i3c_m_handle, &masterCallback, NULL);
    result = p3t1755_set_dynamic_address();
    if (result != kStatus_Success)
    {
        PRINTF("\r\nP3T1755 set dynamic address failed.\r\n");
    }
    p3t1755Config.writeTransfer = I3C_WriteSensor;
    p3t1755Config.readTransfer  = I3C_ReadSensor;
    p3t1755Config.sensorAddress = SENSOR_ADDR;
    P3T1755_Init(&p3t1755Handle, &p3t1755Config);
    Lcd_Init();
    LCD_Clear(RED);
    LCD_ShowString(20,10,"MCXN947",YELLOW);  
    LCD_ShowString(20,30,"P3T1755",YELLOW);
    LCD_ShowString(20,50,"t=",YELLOW);
    while (1)
    {
        result = P3T1755_ReadTemperature(&p3t1755Handle, &temperature);
        if (result != kStatus_Success)
        {
              PRINTF("\r\nP3T1755 read temperature failed.\r\n");
        }
        else
        {
              LCD_ShowNum(36,50,temperature,3,YELLOW);
              d=((int)(temperature*100))%100;
              LCD_ShowChar(60,50,'.',0,YELLOW);
              LCD_ShowNum(68,50,d,2,YELLOW);
        }
        SDK_DelayAtLeastUs(1000000, CLOCK_GetCoreSysClkFreq());
    }
}

 

经程序的编译和下载，其显示效果如图4所示。

 

图3 电路连接

 

 

图4 检测效果