PicoSDK
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Outline
#include "hardware/claim.h"
hw_claim_lock()
hw_claim_unlock(uint32_t)
hw_is_claimed(const uint8_t *, uint)
hw_claim_or_assert(uint8_t *, uint, const char *)
hw_claim_unused_from_range(uint8_t *, bool, uint, uint, const char *)
hw_claim_clear(uint8_t *, uint)
Files
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SourceVuRaspberry Pi Pico SDK and ExamplesPicoSDKsrc/common/hardware_claim/claim.c
 
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/* * Copyright (c) 2020 Raspberry Pi (Trading) Ltd. * * SPDX-License-Identifier: BSD-3-Clause *//* ... */ #include "hardware/claim.h" uint32_t hw_claim_lock(void) { return spin_lock_blocking(spin_lock_instance(PICO_SPINLOCK_ID_HARDWARE_CLAIM)); }{ ... } void hw_claim_unlock(uint32_t save) { spin_unlock(spin_lock_instance(PICO_SPINLOCK_ID_HARDWARE_CLAIM), save); }{ ... } inline bool hw_is_claimed(const uint8_t *bits, uint bit_index) { return (bits[bit_index >> 3u] & (1u << (bit_index & 7u))); }{ ... } void hw_claim_or_assert(uint8_t *bits, uint bit_index, const char *message) { uint32_t save = hw_claim_lock(); if (hw_is_claimed(bits, bit_index)) { panic(message, bit_index); }if (hw_is_claimed(bits, bit_index)) { ... } else { bits[bit_index >> 3u] |= (uint8_t)(1u << (bit_index & 7u)); }else { ... } hw_claim_unlock(save); }{ ... } int hw_claim_unused_from_range(uint8_t *bits, bool required, uint bit_lsb, uint bit_msb, const char *message) { // don't bother check lsb / msb order as if wrong, then it'll fail anyway uint32_t save = hw_claim_lock(); int found_bit = -1; for(uint bit=bit_lsb; bit <= bit_msb; bit++) { if (!hw_is_claimed(bits, bit)) { bits[bit >> 3u] |= (uint8_t)(1u << (bit & 7u)); found_bit = (int)bit; break; }if (!hw_is_claimed(bits, bit)) { ... } }for (uint bit=bit_lsb; bit <= bit_msb; bit++) { ... } hw_claim_unlock(save); if (found_bit < 0 && required) { panic(message); }if (found_bit < 0 && required) { ... } return found_bit; }{ ... } void hw_claim_clear(uint8_t *bits, uint bit_index) { uint32_t save = hw_claim_lock(); assert(hw_is_claimed(bits, bit_index)); bits[bit_index >> 3u] &= (uint8_t) ~(1u << (bit_index & 7u)); hw_claim_unlock(save); }{ ... }
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