src/rp2_common/hardware_sync/sync.c (PicoSDK)

/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause */ #include "hardware/sync.h" #include "hardware/claim.h" static_assert(PICO_SPINLOCK_ID_STRIPED_LAST >= PICO_SPINLOCK_ID_STRIPED_FIRST, ""); static uint8_t striped_spin_lock_num = PICO_SPINLOCK_ID_STRIPED_FIRST; static uint32_t claimed; static void check_lock_num(uint __unused lock_num) { invalid_params_if(HARDWARE_SYNC, lock_num >= 32); } uint next_striped_spin_lock_num(void) { uint rc = striped_spin_lock_num++; if (striped_spin_lock_num > PICO_SPINLOCK_ID_STRIPED_LAST) { striped_spin_lock_num = PICO_SPINLOCK_ID_STRIPED_FIRST; } return rc; } void spin_lock_claim(uint lock_num) { check_lock_num(lock_num); hw_claim_or_assert((uint8_t *) &claimed, lock_num, "Spinlock %d is already claimed"); } void spin_lock_claim_mask(uint32_t mask) { for(uint i = 0; mask; i++, mask >>= 1u) { if (mask & 1u) spin_lock_claim(i); } } void spin_lock_unclaim(uint lock_num) { check_lock_num(lock_num); spin_unlock_unsafe(spin_lock_instance(lock_num)); hw_claim_clear((uint8_t *) &claimed, lock_num); } int spin_lock_claim_unused(bool required) { return hw_claim_unused_from_range((uint8_t*)&claimed, required, PICO_SPINLOCK_ID_CLAIM_FREE_FIRST, PICO_SPINLOCK_ID_CLAIM_FREE_LAST, "No spinlocks are available"); } bool spin_lock_is_claimed(uint lock_num) { check_lock_num(lock_num); return hw_is_claimed((uint8_t *) &claimed, lock_num); }