Add files via upload
This commit is contained in:
Frank Adams
GitHub
parent
e22ddafa69
commit
0d4144a3de
1 changed files with 203 additions and 153 deletions
|
|
@ -15,9 +15,7 @@
|
|||
// This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier
|
||||
// keys over USB. Multi-media keys are are sent with keyboard press and release functions.
|
||||
// Description of Teensyduino keyboard functions is at www.pjrc.com/teensy/td_keyboard.html
|
||||
// The PS/2 code was originally from https://playground.arduino.cc/uploads/ComponentLib/mouse.txt
|
||||
// but the interface to the PC was changed from RS232 serial to USB using the PJRC Mouse functions.
|
||||
// A watchdog timer was also added to the "while loops" so the code doesn't hang if the Teensy is
|
||||
// The PS/2 code has a watchdog timer so the code doesn't hang if the Teensy is
|
||||
// interrupted by I2C or USB traffic.
|
||||
//
|
||||
// The test points on the touchpad were wired to a Teensy 3.2 as follows:
|
||||
|
|
@ -28,14 +26,15 @@
|
|||
// In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick
|
||||
//
|
||||
// Revision History
|
||||
// Initial Release Nov 15, 2018
|
||||
// Rev 1.0 - Nov 15, 2018 - Original Release
|
||||
// Rev 1.1 - Dec 2, 2018 - Replaced ps/2 trackpoint code from playground arduino with my own code
|
||||
//
|
||||
//
|
||||
#define MODIFIERKEY_FN 0x8f // give Fn key a HID code
|
||||
#define CAPS_LED 13 // Teensy LED shows Caps-Lock
|
||||
//
|
||||
#define MDATA 15 // Touchpad ps/2 data connected to Teensy I/O pin 15
|
||||
#define MCLK 14 // Touchpad ps/2 clock connected to Teensy I/O pin 14
|
||||
#define TP_DATA 15 // Touchpad ps/2 data connected to Teensy I/O pin 15
|
||||
#define TP_CLK 14 // Touchpad ps/2 clock connected to Teensy I/O pin 14
|
||||
//
|
||||
//
|
||||
const byte rows_max = 17; // sets the number of rows in the matrix
|
||||
|
|
@ -301,190 +300,239 @@ void go_1(int pin)
|
|||
digitalWrite(pin, HIGH);
|
||||
}
|
||||
//
|
||||
// -----------Touchpad Functions--------------
|
||||
// Function to send the Touchpad a command
|
||||
void touchpad_write(char data)
|
||||
// *****************Functions for Touchpad***************************
|
||||
//
|
||||
// Function to send the touchpad a byte of data (command)
|
||||
//
|
||||
void tp_write(char send_data)
|
||||
{
|
||||
char i;
|
||||
char parity = 1;
|
||||
// put pins in output mode
|
||||
go_z(MDATA);
|
||||
go_z(MCLK);
|
||||
elapsedMillis watchdog; // set watchdog to zero
|
||||
delayMicroseconds(300);
|
||||
go_0(MCLK);
|
||||
delayMicroseconds(300);
|
||||
go_0(MDATA);
|
||||
delayMicroseconds(10);
|
||||
// start bit
|
||||
go_z(MCLK);
|
||||
// wait for touchpad to take control of clock)
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
unsigned int timeout = 200; // breakout of loop if over this value in msec
|
||||
elapsedMillis watchdog; // zero the watchdog timer clock
|
||||
char odd_parity = 0; // clear parity bit count
|
||||
// Enable the bus by floating the clock and data
|
||||
go_z(TP_CLK); //
|
||||
go_z(TP_DATA); //
|
||||
delayMicroseconds(250); // wait before requesting the bus
|
||||
go_0(TP_CLK); // Send the Clock line low to request to transmit data
|
||||
delayMicroseconds(100); // wait for 100 microseconds per bus spec
|
||||
go_0(TP_DATA); // Send the Data line low (the start bit)
|
||||
delayMicroseconds(1); //
|
||||
go_z(TP_CLK); // Release the Clock line so it is pulled high
|
||||
delayMicroseconds(1); // give some time to let the clock line go high
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// clock is low, and we are clear to send data
|
||||
for (i=0; i < 8; i++) {
|
||||
if (data & 0x01) {
|
||||
go_z(MDATA);
|
||||
// send the 8 bits of send_data
|
||||
for (int j=0; j<8; j++) {
|
||||
if (send_data & 1) { //check if lsb is set
|
||||
go_z(TP_DATA); // send a 1 to TP
|
||||
odd_parity = odd_parity + 1; // keep running total of 1's sent
|
||||
}
|
||||
else {
|
||||
go_0(MDATA);
|
||||
go_0(TP_DATA); // send a 0 to TP
|
||||
}
|
||||
// wait for clock cycle
|
||||
while (digitalRead(MCLK) == LOW) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
parity = parity ^ (data & 0x01);
|
||||
data = data >> 1;
|
||||
send_data = send_data >> 1; // shift data right by 1 to prepare for next loop
|
||||
}
|
||||
// parity
|
||||
if (parity) {
|
||||
go_z(MDATA);
|
||||
// send the parity bit
|
||||
if (odd_parity & 1) { //check if lsb of parity is set
|
||||
go_0(TP_DATA); // already odd so send a 0 to TP
|
||||
}
|
||||
else {
|
||||
go_0(MDATA);
|
||||
go_z(TP_DATA); // send a 1 to TP to make parity odd
|
||||
}
|
||||
// wait for clock cycle
|
||||
while (digitalRead(MCLK) == LOW) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// stop bit
|
||||
go_z(MDATA);
|
||||
delayMicroseconds(50);
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
go_z(TP_DATA); // Release the Data line so it goes high as the stop bit
|
||||
delayMicroseconds(80); // testing shows delay at least 40us
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// wait for touchpad to switch modes
|
||||
while ((digitalRead(MCLK) == LOW) || (digitalRead(MDATA) == LOW)) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
delayMicroseconds(1); // wait to let the data settle
|
||||
if (digitalRead(TP_DATA)) { // Ack bit s/b low if good transfer
|
||||
touchpad_error = HIGH; //bad ack bit so set the error flag
|
||||
}
|
||||
while ((digitalRead(TP_CLK) == LOW) || (digitalRead(TP_DATA) == LOW)) { // loop if clock or data are low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// put a hold on the incoming data.
|
||||
go_0(MCLK);
|
||||
// Inhibit the bus so the tp only talks when we're listening
|
||||
go_0(TP_CLK);
|
||||
}
|
||||
|
||||
//
|
||||
// Function to get a byte of data from the touchpad
|
||||
//
|
||||
char touchpad_read(void)
|
||||
char tp_read(void)
|
||||
{
|
||||
char data = 0x00;
|
||||
int i;
|
||||
char bity = 0x01;
|
||||
// start the clock
|
||||
elapsedMillis watchdog; // set watchdog to zero
|
||||
go_z(MCLK);
|
||||
go_z(MDATA);
|
||||
delayMicroseconds(50);
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
unsigned int timeout = 200; // breakout of loop if over this value in msec
|
||||
elapsedMillis watchdog; // zero the watchdog timer clock
|
||||
char rcv_data = 0; // initialize to zero
|
||||
char mask = 1; // shift a 1 across the 8 bits to select where to load the data
|
||||
char rcv_parity = 0; // count the ones received
|
||||
go_z(TP_CLK); // release the clock
|
||||
go_z(TP_DATA); // release the data
|
||||
delayMicroseconds(5); // delay to let clock go high
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
delayMicroseconds(5); // wait for clock ring to settle
|
||||
while (digitalRead(MCLK) == LOW) { // eat start bit
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
if (digitalRead(TP_DATA)) { // Start bit s/b low from tp
|
||||
touchpad_error = HIGH; // No start bit so set the error flag
|
||||
}
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
for (i=0; i < 8; i++) {
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
for (int k=0; k<8; k++) {
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
if (digitalRead(MDATA) == HIGH) {
|
||||
data = data | bity;
|
||||
if (digitalRead(TP_DATA)) { // check if data is high
|
||||
rcv_data = rcv_data | mask; // set the appropriate bit in the rcv data
|
||||
rcv_parity++; // increment the parity bit counter
|
||||
}
|
||||
while (digitalRead(MCLK) == LOW) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
mask = mask << 1;
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
bity = bity << 1;
|
||||
}
|
||||
// ignore parity bit
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
// receive parity
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
while (digitalRead(MCLK) == LOW) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
if (digitalRead(TP_DATA)) { // check if received parity is high
|
||||
rcv_parity++; // increment the parity bit counter
|
||||
}
|
||||
rcv_parity = rcv_parity & 1; // mask off all bits except the lsb
|
||||
if (rcv_parity == 0) { // check for bad (even) parity
|
||||
touchpad_error = HIGH; //bad parity so set the error flag
|
||||
}
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// eat stop bit
|
||||
while (digitalRead(MCLK) == HIGH) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
// stop bit
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == HIGH) { // loop until the clock goes low
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
while (digitalRead(MCLK) == LOW) {
|
||||
if (watchdog >= 200) { //check for infinite loop
|
||||
if (digitalRead(TP_DATA) == LOW) { // check if stop bit is bad (low)
|
||||
touchpad_error = HIGH; //bad stop bit so set the error flag
|
||||
}
|
||||
delayMicroseconds(1); // delay to let the clock settle out
|
||||
while (digitalRead(TP_CLK) == LOW) { // loop until the clock goes high
|
||||
if (watchdog >= timeout) { //check for infinite loop
|
||||
touchpad_error = HIGH; // set error flag
|
||||
break;
|
||||
break; // break out of infinite loop
|
||||
}
|
||||
}
|
||||
// put a hold on the incoming data.
|
||||
go_0(MCLK);
|
||||
return data;
|
||||
// Inhibit the bus so the tp only talks when we're listening
|
||||
go_0(TP_CLK);
|
||||
return rcv_data; // pass the received data back
|
||||
}
|
||||
|
||||
//
|
||||
void touchpad_init()
|
||||
{
|
||||
touchpad_error = LOW; // start with no error
|
||||
go_z(MCLK); // float the clock and data to touchpad
|
||||
go_z(MDATA);
|
||||
// Sending reset to touchpad
|
||||
touchpad_write(0xff);
|
||||
touchpad_read(); // ack byte
|
||||
// Read ack byte
|
||||
touchpad_read(); // blank
|
||||
touchpad_read(); // blank
|
||||
// Default resolution is 4 counts/mm which is too small
|
||||
// Sending resolution command
|
||||
touchpad_write(0xe8);
|
||||
touchpad_read(); // ack byte
|
||||
touchpad_write(0x03); // value of 03 gives 8 counts/mm resolution
|
||||
touchpad_read(); // ack byte
|
||||
go_z(TP_CLK); // float the clock and data to touchpad
|
||||
go_z(TP_DATA);
|
||||
// Sending reset command to touchpad
|
||||
tp_write(0xff);
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
delayMicroseconds(100); // give the tp time to run its self diagnostic
|
||||
// verify proper response from tp
|
||||
if (tp_read() != 0xaa) { // verify basic assurance test passed
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
if (tp_read() != 0x00) { // verify correct device id
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
// increase resolution from 4 counts/mm to 8 counts/mm
|
||||
tp_write(0xe8); // Sending resolution command
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
tp_write(0x03); // value of 03 = 8 counts/mm resolution (default is 4 counts/mm)
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
// Sending remote mode code so the touchpad will send data only when polled
|
||||
touchpad_write(0xf0); // remote mode
|
||||
touchpad_read(); // Read ack byte
|
||||
tp_write(0xf0); // remote mode
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
if (touchpad_error == HIGH) { // check for any errors from tp
|
||||
delayMicroseconds(300); // wait before trying to initialize tp one last time
|
||||
tp_write(0xff); // send tp reset code
|
||||
tp_read(); // read but don't look at response from tp
|
||||
tp_read(); // read but don't look at response from tp
|
||||
tp_read(); // read but don't look at response from tp
|
||||
tp_write(0xe8); // Send resolution command
|
||||
tp_read(); // read but don't look at response from tp
|
||||
tp_write(0x03); // value of 03 gives 8 counts/mm resolution
|
||||
tp_read(); // read but don't look at response from tp
|
||||
tp_write(0xf0); // remote mode
|
||||
tp_read(); // read but don't look at response from tp
|
||||
delayMicroseconds(100);
|
||||
}
|
||||
}
|
||||
//----------------------------------Setup-------------------------------------------
|
||||
void setup() {
|
||||
|
|
@ -598,11 +646,13 @@ void loop() {
|
|||
// poll the touchpad for new movement data
|
||||
over_flow = 0; // assume no overflow until status is received
|
||||
touchpad_error = LOW; // start with no error
|
||||
touchpad_write(0xeb); // request data
|
||||
touchpad_read(); // ignore ack
|
||||
mstat = touchpad_read(); // save into status variable
|
||||
mx = touchpad_read(); // save into x variable
|
||||
my = touchpad_read(); // save into y variable
|
||||
tp_write(0xeb); // request data
|
||||
if (tp_read() != 0xfa) { // verify correct ack byte
|
||||
touchpad_error = HIGH;
|
||||
}
|
||||
mstat = tp_read(); // save into status variable
|
||||
mx = tp_read(); // save into x variable
|
||||
my = tp_read(); // save into y variable
|
||||
if (((0x80 & mstat) == 0x80) || ((0x40 & mstat) == 0x40)) { // x or y overflow bits set?
|
||||
over_flow = 1; // set the overflow flag
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue