0ef1717155
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83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2018 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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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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* ----------------------------------------------------------------
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* File: fpga.c
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* Release: Version 1.0
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* ----------------------------------------------------------------
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*/
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/*
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* Code implementation file for the fpga functions.
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*/
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#include "FVP_MPS2.h" // MPS2 common header
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// Function to delay n*ticks (25MHz = 40nS per tick)
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// Used for I2C drivers
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void i2c_delay(unsigned int tick)
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{
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unsigned int end;
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unsigned int start;
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start = MPS2_FPGAIO->COUNTER;
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end = start + (tick);
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if (end >= start) {
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while (MPS2_FPGAIO->COUNTER >= start && MPS2_FPGAIO->COUNTER < end);
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} else {
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while (MPS2_FPGAIO->COUNTER >= start);
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while (MPS2_FPGAIO->COUNTER < end);
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}
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}
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/* Sleep function to delay n*mS
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* Uses FPGA counter.
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*/
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void Sleepms(unsigned int msec)
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{
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unsigned int end;
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unsigned int start;
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start = MPS2_FPGAIO->COUNTER;
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end = start + (25 * msec * 1000);
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if (end >= start) {
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while (MPS2_FPGAIO->COUNTER >= start && MPS2_FPGAIO->COUNTER < end);
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} else {
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while (MPS2_FPGAIO->COUNTER >= start);
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while (MPS2_FPGAIO->COUNTER < end);
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}
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}
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/* Sleep function to delay n*uS
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*/
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void Sleepus(unsigned int usec)
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{
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unsigned int end;
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unsigned int start;
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start = MPS2_FPGAIO->COUNTER;
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end = start + (25 * usec);
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if (end >= start) {
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while (MPS2_FPGAIO->COUNTER >= start && MPS2_FPGAIO->COUNTER < end);
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} else {
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while (MPS2_FPGAIO->COUNTER >= start);
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while (MPS2_FPGAIO->COUNTER < end);
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}
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}
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