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51b6379dee
The `channels` member should not be set to the number of hardware channels *n*, but to *n* - 1 instead. The last channel is implicitly used in `timer_read()`. Hence out of *n* hardware channels, only *n* - 1 are available to the application. This fixes a bug introduced by 4d02e1524732b040f5109adbeed416b38ceb8c19 which incorrectly set the channel number to *n* rather than to *n* - 1.