I want to make use of the clock of rpi. How can I do it? On an arduino it would have been as easy as setting up an TCCR and the respective pin would give the required clock signal. I require two clock signals for my circuit,44.1 KHz and 16 MHz. If it is at all possible, how can it be done?
I know GPIO4 can be used as GPCLK0 in an alternate mode but only that about it. Any suggestion would be appreciated. Thank you.
Command Line http://abyz.me.uk/rpi/pigpio/pigs.html#HC
C and Python equivalents are available.
HC g cf - Set hardware clock frequency
This command sets the hardware clock associated with GPIO g to
frequency cf. Frequencies above 30MHz are unlikely to work.
Upon success nothing is returned. On error a negative status
code will be returned.
Example
$ pigs hc 4 5000 # start a 5 KHz clock on GPIO 4 (clock 0)
$ pigs hc 5 5000000 # start a 5 MHz clcok on GPIO 5 (clock 1)
-99
ERROR: need password to use hardware clock 1
The same clock is available on multiple GPIO. The latest
frequency setting will be used by all GPIO which share
a clock.
The GPIO must be one of the following.
4 clock 0 All models
5 clock 1 All models but A and B (reserved for system use)
6 clock 2 All models but A and B
20 clock 0 All models but A and B
21 clock 1 All models but A and B (Rev. 2) (reserved for system use)
32 clock 0 Compute module only
34 clock 0 Compute module only
42 clock 1 Compute module only (reserved for system use)
43 clock 2 Compute module only
44 clock 1 Compute module only (reserved for system use)
Access to clock 1 is protected by a password as its use will
likely crash the Pi. The password is given by or'ing
0x5A000000 with the GPIO number.
