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rp2/mphalport: Implement mp_hal_ticks_cpu for RISCV using mcycle.

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Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George 2024-08-08 22:26:14 +10:00
parent 957cea23d5
commit ea2eed1b23
2 changed files with 15 additions and 0 deletions
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11
ports/rp2/mphalport.c
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@ -125,6 +125,17 @@ mp_uint_t mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
return did_write ? ret : 0; return did_write ? ret : 0;
} }
#if PICO_RISCV
__attribute__((naked)) mp_uint_t mp_hal_ticks_cpu(void) {
__asm volatile (
"li a0, 4\n" // mask value to uninhibit mcycle counter
"csrw mcountinhibit, a0\n" // uninhibit mcycle counter
"csrr a0, mcycle\n" // get mcycle counter
"ret\n"
);
}
#endif
void mp_hal_delay_us(mp_uint_t us) { void mp_hal_delay_us(mp_uint_t us) {
// Avoid calling sleep_us() and invoking the alarm pool by splitting long // Avoid calling sleep_us() and invoking the alarm pool by splitting long
// sleeps into an optional longer sleep and a shorter busy-wait // sleeps into an optional longer sleep and a shorter busy-wait

4
ports/rp2/mphalport.h
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@ -96,11 +96,15 @@ static inline mp_uint_t mp_hal_ticks_ms(void) {
return to_ms_since_boot(get_absolute_time()); return to_ms_since_boot(get_absolute_time());
} }
#if PICO_ARM
static inline mp_uint_t mp_hal_ticks_cpu(void) { static inline mp_uint_t mp_hal_ticks_cpu(void) {
// ticks_cpu() is defined as using the highest-resolution timing source // ticks_cpu() is defined as using the highest-resolution timing source
// in the system. This is usually a CPU clock, but doesn't have to be. // in the system. This is usually a CPU clock, but doesn't have to be.
return time_us_32(); return time_us_32();
} }
#elif PICO_RISCV
mp_uint_t mp_hal_ticks_cpu(void);
#endif
static inline mp_uint_t mp_hal_get_cpu_freq(void) { static inline mp_uint_t mp_hal_get_cpu_freq(void) {
return clock_get_hz(clk_sys); return clock_get_hz(clk_sys);