Add cycle counter driver and test app #386
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alistair23
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Apr 2, 2024
libtock/cycle_counter.h
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| bool cycle_counter_exists(void); | ||
| int cycle_counter_start(void); | ||
| int cycle_counter_stop(void); | ||
| int cycle_counter_reset(void); | ||
| int cycle_counter_read(int *count); |
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It's probably best to document these in the header file.
It's also worth saying that stop does not reset the counter and it needs to manually be reset
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Can I ask you follow the new guide? https://github.com/tock/libtock-c/blob/43525b8fedff3531685dbb20b08916addcca0997/doc/guide.md Maybe not the syscalls folder but the naming convention? |
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Also adds a helper function for SuccessU64 syscall return values
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ppannuto
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Apr 10, 2024
| } else if (rc == RETURNCODE_ERESERVE) { | ||
| printf("Cycle counter claimed by another app\n"); | ||
| } else if (rc != 0) { | ||
| printf("Cycle counter: other error: %d\n", rc); |
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| printf("Cycle counter: other error: %d\n", rc); | |
| printf("Cycle counter: other error: %d (%s)\n", rc, tock_strerr(rc)); |
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I will come back to this once the new libtock format is merged |
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@hudson-ayers is this still on your queue? |
Yeah it is, just have had limited time for Tock stuff and have focused more on kernel stuff. I will get back to this eventually |
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This PR adds a driver for the cycle counter capsule, for which kernel support is being added in tock/tock#3934. It also adds a basic test application which prints the number of cycles required to toggle an LED, after checking that the ability to start and stop the driver has not already been claimed by another app.
Tested by adding the capsule to the nrf52840dk and running this app. It takes about 4000 cycles to toggle an LED from userspace.