| /* |
| * Copyright (c) 2015-2016, Texas Instruments Incorporated |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * * Neither the name of Texas Instruments Incorporated nor the names of |
| * its contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
| * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| #include <ti/drivers/dpl/HwiP.h> |
| #include <ti/drivers/utils/RingBuf.h> |
| |
| /* |
| * ======== RingBuf_construct ======== |
| */ |
| void RingBuf_construct(RingBuf_Handle object, unsigned char *bufPtr, |
| size_t bufSize) |
| { |
| object->buffer = bufPtr; |
| object->length = bufSize; |
| object->count = 0; |
| object->head = bufSize - 1; |
| object->tail = 0; |
| object->maxCount = 0; |
| } |
| |
| /* |
| * ======== RingBuf_get ======== |
| */ |
| int RingBuf_get(RingBuf_Handle object, unsigned char *data) |
| { |
| unsigned int key; |
| |
| key = HwiP_disable(); |
| |
| if (!object->count) { |
| HwiP_restore(key); |
| return -1; |
| } |
| |
| *data = object->buffer[object->tail]; |
| object->tail = (object->tail + 1) % object->length; |
| object->count--; |
| |
| HwiP_restore(key); |
| |
| return (object->count); |
| } |
| |
| /* |
| * ======== RingBuf_getCount ======== |
| */ |
| int RingBuf_getCount(RingBuf_Handle object) |
| { |
| return (object->count); |
| } |
| |
| /* |
| * ======== RingBuf_isFull ======== |
| */ |
| bool RingBuf_isFull(RingBuf_Handle object) |
| { |
| return (object->count == object->length); |
| } |
| |
| /* |
| * ======== RingBuf_getMaxCount ======== |
| */ |
| int RingBuf_getMaxCount(RingBuf_Handle object) |
| { |
| return (object->maxCount); |
| } |
| |
| /* |
| * ======== RingBuf_peek ======== |
| */ |
| int RingBuf_peek(RingBuf_Handle object, unsigned char *data) |
| { |
| unsigned int key; |
| int retCount; |
| |
| key = HwiP_disable(); |
| |
| *data = object->buffer[object->tail]; |
| retCount = object->count; |
| |
| HwiP_restore(key); |
| |
| return (retCount); |
| } |
| |
| /* |
| * ======== RingBuf_put ======== |
| */ |
| int RingBuf_put(RingBuf_Handle object, unsigned char data) |
| { |
| unsigned int key; |
| unsigned int next; |
| |
| key = HwiP_disable(); |
| |
| if (object->count != object->length) { |
| next = (object->head + 1) % object->length; |
| object->buffer[next] = data; |
| object->head = next; |
| object->count++; |
| object->maxCount = (object->count > object->maxCount) ? |
| object->count : |
| object->maxCount; |
| } |
| else { |
| |
| HwiP_restore(key); |
| return (-1); |
| } |
| |
| HwiP_restore(key); |
| |
| return (object->count); |
| } |