请问如果ePWM上拉电阻使能的话会有什么后果？

2019-03-24 09:02发布

站内问答 / TI MCU
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TI piccolo手册中“对于可以用作ePWM的输出的引脚，默认内部上拉电阻禁止使能“，请问如果ePWM上拉电阻使能的话会有什么后果？谢谢！
  1. void InitEPwm1Gpio(void)
  2. {
  3.    EALLOW;

  5. /* Disable internal pull-up for the selected output pins
  6.    for reduced power consumption */
  7. // Pull-ups can be enabled or disabled by the user.
  8. // Comment out other unwanted lines.

  10.     GpioCtrlRegs.GPAPUD.bit.GPIO0 = 1;    // Disable pull-up on GPIO0 (EPWM1A)
  11.     GpioCtrlRegs.GPAPUD.bit.GPIO1 = 1;    // Disable pull-up on GPIO1 (EPWM1B)

  13. /* Configure EPWM-1 pins using GPIO regs*/
  14. // This specifies which of the possible GPIO pins will be EPWM1 functional pins.
  15. // Comment out other unwanted lines.

  17.     GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;   // Configure GPIO0 as EPWM1A
  18.     GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;   // Configure GPIO1 as EPWM1B

  20.     EDIS;
  21. }

  23. 改为

  25. void InitEPwm1Gpio(void)
  26. {
  27.    EALLOW;

  29. /* Disable internal pull-up for the selected output pins
  30.    for reduced power consumption */
  31. // Pull-ups can be enabled or disabled by the user.
  32. // Comment out other unwanted lines.

  34.     GpioCtrlRegs.GPAPUD.bit.GPIO0 = 0   // Enable pull-up on GPIO0 (EPWM1A)
  35.     GpioCtrlRegs.GPAPUD.bit.GPIO1 = 0    // Enalbe pull-up on GPIO1 (EPWM1B)

  37. /* Configure EPWM-1 pins using GPIO regs*/
  38. // This specifies which of the possible GPIO pins will be EPWM1 functional pins.
  39. // Comment out other unwanted lines.

  41.     GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 1;   // Configure GPIO0 as EPWM1A
  42.     GpioCtrlRegs.GPAMUX1.bit.GPIO1 = 1;   // Configure GPIO1 as EPWM1B

  44.     EDIS;
  45. }
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2条回答
dontium
2019-03-24 15:57
< ：TI_MSP430_内容页_SA7 --> 楼主看看GPIO MUX的功能。

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