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swappad
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May 19, 2021
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| if (instances[id].ready && (instances[id].head == instances[id].tail)) { // Can send directly | ||
| instances[id].ready = false; // Luca: indicate queue not empty | ||
| *instances[id].udr = data; | ||
| } else if (instances[id].tail != instances[id].head | ||
| || !instances[id].full) { // Not empty but needs to be added to queue | ||
| instances[id].ready = false; // Luca: indicate queue not empty | ||
| instances[id].data[instances[id].head] = data; | ||
| instances[id].head = (instances[id].head + 1) % RING_BUFFER_SIZE; | ||
| if (instances[id].tail == instances[id].head) { |
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instances[id].head == instances[id].tail vs. instances[id].tail != instances[id].head
Wann ist die Queue
- leer ?
- nicht leer ?
- voll ?
instances[id].head == instances[id].tail wird verwendet für Queue leer und Queue voll. Passt das?
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Wenn Queue voll oder leer ist gilt jeweils head==tail, um das zu unterscheiden gibt es noch den full bool.
Ready wird nur genutzt um zu checken ob die UART Hardware gerade bereit zur Nutzung ist (für den Fall Queue Empty aber Transaktion noch nicht fertig)
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