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67 lines
1.3 KiB
67 lines
1.3 KiB
//
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// Created by MightyPork on 2018/03/31.
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//
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#include "main.h"
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#include <stdbool.h>
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#include <string.h>
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#include "debug.h"
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#include "msg_queue.h"
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// the two USB messaging queues
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MQueue usb_rxq;
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MQueue usb_txq;
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void mq_init(MQueue *mq)
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{
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mq->lr = MQ_LEN-1;
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}
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bool mq_can_post(MQueue *mq)
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{
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return mq->nw != mq->lr;
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}
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bool mq_post(MQueue *mq, const uint8_t *buffer, uint32_t len)
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{
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if (!mq_can_post(mq)) {
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dbg("FULL!");
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return false;
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}
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if (len >= MQ_SLOT_LEN) {
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dbg("mq post too long!");
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return false;
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}
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memcpy(mq->slots[mq->nw].packet, buffer, len);
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// pad with zeros
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if (len < MQ_SLOT_LEN) memset(mq->slots[mq->nw].packet+len, 0, MQ_SLOT_LEN - len);
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mq->nw++;
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if (mq->nw == MQ_LEN) mq->nw = 0;
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return true;
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}
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bool mq_can_read(MQueue *mq)
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{
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// handle LR at the end, NW at 0 (initial state)
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if (mq->lr == MQ_LEN-1) return mq->nw > 0;
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// wrap-around - if LR not at the end, always have some to read
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if (mq->nw <= mq->lr) return true;
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// forward - one between
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return mq->lr < mq->nw - 1;
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}
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bool mq_read(MQueue *mq, uint8_t *buffer)
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{
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if (!mq_can_read(mq)) {
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return false;
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}
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mq->lr++;
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if (mq->lr == MQ_LEN) mq->lr = 0;
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memcpy(buffer, mq->slots[mq->lr].packet, MQ_SLOT_LEN);
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return true;
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}
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