includeincludeincludeincludestaticintgetResultFromSystemCall(constcharpCmd,charpResult,intsize){ intfd; if(pipe(fd)){  printf("pipeerror!\n");  return-1;  }&nbs…

 采用lcd电阻触摸一路GPIO1_IO04用作PWM控制，并输出2.4K的方波。 CPU默认可输出8路PWM，默认背光采用的为PWM1，增加GPIO1_IO04复用为PWM3。驱动默认已经加载，驱动路径为drivers/pwm/pwm-imx.c。 修改设备树，修改imx6ul.dtsi中pwm3:pwm@02088000{compatible="fsl,imx6u…