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WIP: uart: Byteverlust bei der Übertragung #9

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WIP: uart: Byteverlust bei der Übertragung #9

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8bed903
uart tx ready fix; check if queue empty before immediate write to reg…
swappad May 14, 2021
c81c288
falsch auskommentiert rückgängig gemacht
swappad May 19, 2021
737f3d4
Update uart.c
swappad May 20, 2021
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7 changes: 4 additions & 3 deletions uart.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
#define SINGLE_UART 1
#endif

#define RING_BUFFER_SIZE 64
#define RING_BUFFER_SIZE 128

#define MIN_U2X_BAUD (F_CPU/(16*(255 + 1)) + 1)

Expand Down Expand Up @@ -120,11 +120,12 @@ void uart_send_byte(uint8_t id, uint8_t data) {
#if SINGLE_UART
id = 0;
#endif
if (instances[id].ready) { // Can send directly
instances[id].ready = false;
if (instances[id].ready && (instances[id].head == instances[id].tail)) { // Can send directly
instances[id].ready = false;
*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) {
Expand Down