Implementation method of PWM data transmission in input mode
A technology of input mode and data transmission, applied in the direction of electrical digital data processing, instruments, etc., can solve the problems of information loss, data loss, CPU reading data not fast enough, etc., to reduce the possibility of loss and ensure the effect of design
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[0012] Such as figure 1 As shown, the implementation of the PWM in the input mode of the present invention transmits data. When the PWM is in the input mode, the CPU configures the input waveform to use the FIFO buffer mode in the control register. When the input waveform jumps, the jump information The corresponding flag bit is saved in the FIFO. When the stored value in the FIFO reaches the limit value, the CPU interrupts the PWM output waveform and reads the data in the FIFO; when the CPU finishes reading the data in the FIFO, it starts PWM output When the stored value in the FIFO reaches the limit value, the PWM generates an interrupt request signal. When the CPU detects the interrupt request signal, it interrupts the PWM output waveform. The transition information is the high and low level time of the external clock , The FIFO is the first-in first-out queue.
[0013] Such as figure 2 As shown, the input waveform is sampled, and if there is a high and low level flip, an in...
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