57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
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// Copyright 2022-2023 Beken
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "arch_delay.h"
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#include "sys_ll.h"
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#include <soc/soc.h>
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/**
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* The delay_us should NOT depends on CPU frequency since it's very unaccurate!
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*
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* Test Result:
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*
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* CPU_FREQ | cnt | us
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* -----------------------------------------
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* 26000000 | 1 | 1.4
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* | 2 | 1.8
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* | 3 | 2.1
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* | 6 | 3.1
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* | 9 | 4.1
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* | 11 | 5
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* | 26 | 10
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* | 55 | 20
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* | 141 | 50
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* | 288 | 100
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* | 2900 | 1000
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* 120000000 | 8 | 1
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* | 22 | 2
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* | 35 | 3
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* | 50 | 4
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* | 62 | 5
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* | 128 | 10
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* | 260 | 20
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* | 660 | 50
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* | 1330 | 100
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* | 14000 | 1000
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*/
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void arch_delay_cnt(volatile uint32_t cnt)
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{
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while (cnt --);
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}
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void arch_delay_us(uint32_t us)
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{
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//TODO
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}
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