unsigned int GpioInit (void )
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unsigned int IoSetFunc (WifiIotIoName id, unsigned char val )
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unsigned int GpioSetDir (WifiIotGpioIdx id, WifiIotGpioDir dir )
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unsigned int PwmInit (WifiIotPwmPort port)
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unsigned int PwmStart (WifiIotPwmPort port, unsigned short duty, unsigned short freq )
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static void PWMTask(void)
{
    unsigned int i;

    GpioInit();//初始化GPIO
    IoSetFunc(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_IO_FUNC_GPIO_2_PWM2_OUT);//设置GPIO_2引脚复用功能为PWM
    GpioSetDir(WIFI_IOT_IO_NAME_GPIO_2, WIFI_IOT_GPIO_DIR_OUT);//设置GPIO_2引脚为输出模式
    PwmInit(WIFI_IOT_PWM_PORT_PWM2);//初始化PWM2端口

    while (1) 
        {
            for (i = 0; i < 40000; i += 100)
            {
                PwmStart(WIFI_IOT_PWM_PORT_PWM2, i, 40000); //输出不同占空比的PWM波
                usleep(10);
            }            
            i = 0;
        }    
}
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CONFIG_I2C_SUPPORT=y
# CONFIG_I2S_SUPPORT is not set
# CONFIG_SPI_SUPPORT is not set
# CONFIG_DMA_SUPPORT is not set
# CONFIG_SDIO_SUPPORT is not set
# CONFIG_SPI_DMA_SUPPORT is not sety
# CONFIG_UART_DMA_SUPPORT is not set
CONFIG_PWM_SUPPORT = y
# CONFIG_PWM_HOLD_AFTER_REBOOT is not set
CONFIG_AT_SUPPORT=y
CONFIG_FILE_SYSTEM_SUPPORT=y
CONFIG_UART0_SUPPORT=y
CONFIG_UART1_SUPPORT=y
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#"B1_basic_led_blink:led_example",
#"B2_basic_button:button_example",
"B3_basic_pwm_led:pwm_example",
#"B4_basic_adc:adc_example",
#"B5_basic_i2c_nfc:i2c_example",
#"B6_basic_uart:uart_example",
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