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TMS320F28069M: eCAP使用时寄存器CAPx一直为0,不能进中断

Part Number: TMS320F28069M
Other Parts Discussed in Thread: LAUNCHXL-F28069M

用的是ecap_capture_pwm例程代码,试过3块LAUNCHXL-F28069M开发板,都不行

请问这个代码时直接编译烧进去就行吧,然后把PWM输出和eCAP输入相连,不需要更改什么吧