32 lines
746 B
C
32 lines
746 B
C
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#pragma once
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#include <cstdint>
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#include <span>
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#include <vector>
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#include "tusb.h"
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#include "ring_buffer.h"
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struct usb_cdc {
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ring_buffer<512> tx;
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void send(std::span<const uint8_t> data) {
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tx.push(data);
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drain();
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}
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void send(const std::vector<uint8_t>& data) {
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send(std::span<const uint8_t>{data});
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}
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void drain() {
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while (!tx.empty()) {
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uint32_t avail = tud_cdc_write_available();
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if (avail == 0) break;
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auto chunk = tx.read_contiguous();
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if (chunk.size() > avail) chunk = chunk.first(avail);
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tud_cdc_write(chunk.data(), chunk.size());
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tx.consume(chunk.size());
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}
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tud_cdc_write_flush();
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}
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};
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