157 lines
3.3 KiB
C++
157 lines
3.3 KiB
C++
#include "Arduino.h"
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#include "HardwareSerial.h"
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#include "PS2Mouse.h"
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PS2Mouse::PS2Mouse(int data_pin, int clock_pin)
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{
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_data_pin = data_pin;
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_clock_pin = clock_pin;
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}
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/*
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* according to some code I saw, these functions will
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* correctly set the mouse clock and data pins for
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* various conditions.
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*/
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void PS2Mouse::gohi(int pin)
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{
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pinMode(pin, INPUT);
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digitalWrite(pin, HIGH);
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}
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void PS2Mouse::golo(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW);
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}
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void PS2Mouse::write(char data)
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{
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char i;
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char parity = 1;
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// Serial.print("Sending ");
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// Serial.print(data, HEX);
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// Serial.print(" to mouse\n");
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// Serial.print("RTS");
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/* put pins in output mode */
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gohi(_data_pin);
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gohi(_clock_pin);
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delayMicroseconds(300);
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golo(_clock_pin);
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delayMicroseconds(300);
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golo(_data_pin);
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delayMicroseconds(10);
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/* start bit */
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gohi(_clock_pin);
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/* wait for mouse to take control of clock); */
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while (digitalRead(_clock_pin) == HIGH)
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;
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/* clock is low, and we are clear to send data */
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for (i=0; i < 8; i++) {
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if (data & 0x01) {
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gohi(_data_pin);
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}
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else {
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golo(_data_pin);
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}
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/* wait for clock cycle */
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while (digitalRead(_clock_pin) == LOW)
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;
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while (digitalRead(_clock_pin) == HIGH)
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;
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parity = parity ^ (data & 0x01);
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data = data >> 1;
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}
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/* parity */
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if (parity) {
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gohi(_data_pin);
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}
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else {
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golo(_data_pin);
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}
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while (digitalRead(_clock_pin) == LOW)
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;
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while (digitalRead(_clock_pin) == HIGH)
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;
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/* stop bit */
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gohi(_data_pin);
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delayMicroseconds(50);
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while (digitalRead(_clock_pin) == HIGH)
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;
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/* wait for mouse to switch modes */
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while ((digitalRead(_clock_pin) == LOW) || (digitalRead(_data_pin) == LOW))
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;
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/* put a hold on the incoming data. */
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golo(_clock_pin);
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// Serial.print("done.\n");
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}
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/*
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* Get a byte of data from the mouse
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*/
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char PS2Mouse::read(void)
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{
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char data = 0x00;
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int i;
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char bit = 0x01;
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// Serial.print("reading byte from mouse\n");
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/* start the clock */
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gohi(_clock_pin);
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gohi(_data_pin);
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delayMicroseconds(50);
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while (digitalRead(_clock_pin) == HIGH)
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;
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delayMicroseconds(5); /* not sure why */
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while (digitalRead(_clock_pin) == LOW) /* eat start bit */
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;
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for (i=0; i < 8; i++) {
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while (digitalRead(_clock_pin) == HIGH)
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;
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if (digitalRead(_data_pin) == HIGH) {
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data = data | bit;
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}
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while (digitalRead(_clock_pin) == LOW)
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;
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bit = bit << 1;
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}
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/* eat parity bit, which we ignore */
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while (digitalRead(_clock_pin) == HIGH)
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;
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while (digitalRead(_clock_pin) == LOW)
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;
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/* eat stop bit */
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while (digitalRead(_clock_pin) == HIGH)
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;
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while (digitalRead(_clock_pin) == LOW)
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;
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/* put a hold on the incoming data. */
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golo(_clock_pin);
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// Serial.print("Recvd data ");
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// Serial.print(data, HEX);
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// Serial.print(" from mouse\n");
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return data;
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}
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void PS2Mouse::init()
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{
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gohi(_clock_pin);
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gohi(_data_pin);
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// Serial.print("Sending reset to mouse\n");
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write(0xff);
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read(); /* ack byte */
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// Serial.print("Read ack byte1\n");
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read(); /* blank */
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read(); /* blank */
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// Serial.print("Sending remote mode code\n");
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write(0xf0); /* remote mode */
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read(); /* ack */
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// Serial.print("Read ack byte2\n");
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delayMicroseconds(100);
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}
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