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make input buffer size configurable

This commit is contained in:
Stephen Crane 2019-03-03 17:07:47 +00:00
parent 6918621c34
commit cd4b280410
1 changed files with 10 additions and 7 deletions
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17
ps2drv.cpp
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@ -1,8 +1,11 @@
#include <Arduino.h>
#include "ps2drv.h"
#define BUFFER_SIZE 16
static volatile uint8_t buffer[BUFFER_SIZE];
#if !defined(KBD_BUFFER)
#define KBD_BUFFER 16
#endif
static volatile uint8_t buffer[KBD_BUFFER];
static volatile uint8_t head, tail;
static uint8_t DataPin;
@ -29,7 +32,7 @@ void ps2interrupt(void)
bitcount++;
if (bitcount == 11) {
uint8_t i = head + 1;
if (i == BUFFER_SIZE) i = 0;
if (i == KBD_BUFFER) i = 0;
if (i != tail) {
buffer[i] = incoming;
head = i;
@ -44,7 +47,7 @@ bool PS2Driver::available() {
return false;
uint8_t i = tail+1;
if (i == BUFFER_SIZE) i = 0;
if (i == KBD_BUFFER) i = 0;
if (buffer[i] == 0xf0)
return i != head;
return true;
@ -55,7 +58,7 @@ unsigned PS2Driver::read2() {
return 0;
uint8_t i = tail+1;
if (i == BUFFER_SIZE) i = 0;
if (i == KBD_BUFFER) i = 0;
tail = i;
if (buffer[i] != 0xf0)
return buffer[i];
@ -67,9 +70,9 @@ unsigned PS2Driver::peek() {
return 0;
uint8_t i = tail+1;
if (i == BUFFER_SIZE) i = 0;
if (i == KBD_BUFFER) i = 0;
if (buffer[i] == 0xf0) {
if (++i == BUFFER_SIZE) i = 0;
if (++i == KBD_BUFFER) i = 0;
return 0xf000 | buffer[i];
}
return buffer[i];