f28377s LauchPad中将ePWM例程修改ePWM为6，7,8路，只有6有输出，这是怎么回事

你EPWM7 和EPWM8的GPIO MUX改了吗？时钟开了吗？

MUX的设置如下，这些都是默认的，我都没碰

void InitEPwm6Gpio(void)
{
EALLOW;
/* Disable internal pull-up for the selected output pins
for reduced power consumption */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

GpioCtrlRegs.GPAPUD.bit.GPIO10 = 1; // Disable pull-up on GPIO10 (EPWM6A)
GpioCtrlRegs.GPAPUD.bit.GPIO11 = 1; // Disable pull-up on GPIO11 (EPWM6B)
// GpioCtrlRegs.GPEPUD.bit.GPIO155 = 1; // Disable pull-up on GPIO155 (EPWM6A)
// GpioCtrlRegs.GPEPUD.bit.GPIO156 = 1; // Disable pull-up on GPIO156 (EPWM6B)

/* Configure EPWM-6 pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be EPWM6 functional pins.
// Comment out other unwanted lines.

GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 1; // Configure GPIO10 as EPWM6A
GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 1; // Configure GPIO11 as EPWM6B
// GpioCtrlRegs.GPEMUX2.bit.GPIO155 = 1; // Configure GPIO155 as EPWM6A
// GpioCtrlRegs.GPEMUX2.bit.GPIO156 = 1; // Configure GPIO156 as EPWM6B

EDIS;
}

void InitEPwm7Gpio(void)
{
EALLOW;
/* Disable internal pull-up for the selected output pins
for reduced power consumption */
// Pull-ups can be enabled or disabled by the user.
// This will enable the pullups for the specified pins.
// Comment out other unwanted lines.

GpioCtrlRegs.GPAPUD.bit.GPIO12 = 1; // Disable pull-up on GPIO12 (EPWM7A)
GpioCtrlRegs.GPAPUD.bit.GPIO13 = 1; // Disable pull-up on GPIO13 (EPWM7B)
// GpioCtrlRegs.GPEPUD.bit.GPIO157 = 1; // Disable pull-up on GPIO157 (EPWM7A)
// GpioCtrlRegs.GPEPUD.bit.GPIO158 = 1; // Disable pull-up on GPIO158 (EPWM7B)

/* Configure EPWM-6 pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be EPWM6 functional pins.
// Comment out other unwanted lines.

GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 1; // Configure GPIO12 as EPWM7A
GpioCtrlRegs.GPAMUX1.bit.GPIO13 = 1; // Configure GPIO13 as EPWM7B
// GpioCtrlRegs.GPEMUX2.bit.GPIO157 = 1; // Configure GPIO157 as EPWM7A
// GpioCtrlRegs.GPEMUX2.bit.GPIO158 = 1; // Configure GPIO158 as EPWM7B

EDIS;
}

时钟如下：

// enable PWM1, PWM2 and PWM3
CpuSysRegs.PCLKCR2.bit.EPWM6=1;
CpuSysRegs.PCLKCR2.bit.EPWM7=1;
CpuSysRegs.PCLKCR2.bit.EPWM8=1;

您帮我看看这个怎么弄啊

你是用的GPIO12 13 14 15测得吗？