Hendrik Lipka
touch screen handler for the microchip AR1020
Diff: ar1020.cpp
- Revision:
- 2:1a436d154c84
- Parent:
- 1:264ad2a00fd9
- Child:
- 3:b7eb3b3fe79f
diff -r 264ad2a00fd9 -r 1a436d154c84 ar1020.cpp
--- a/ar1020.cpp Tue Feb 22 21:43:39 2011 +0000
+++ b/ar1020.cpp Tue Feb 22 22:11:49 2011 +0000
@@ -24,8 +24,7 @@
#include "ar1020.h"
#include "wait_api.h"
-AR1020::AR1020(SPI *spi, PinName enable, PinName sqi, PinName power, bool swapX, bool swapY, bool swapXY)
-{
+AR1020::AR1020(SPI *spi, PinName enable, PinName sqi, PinName power, bool swapX, bool swapY, bool swapXY) {
_spi=spi;
_enable=new DigitalOut(enable);
_enable->write(1);
@@ -39,8 +38,7 @@
_power->write(0);
}
-AR1020::AR1020(PinName mosi, PinName miso, PinName clk, PinName enable, PinName sqi, PinName power, bool swapX, bool swapY, bool swapXY)
-{
+AR1020::AR1020(PinName mosi, PinName miso, PinName clk, PinName enable, PinName sqi, PinName power, bool swapX, bool swapY, bool swapXY) {
_mosi=new DigitalOut(mosi);
_miso=new DigitalIn(miso);
_clk=new DigitalOut(clk);
@@ -59,17 +57,15 @@
_power->write(0);
}
-AR1020::~AR1020()
-{
+AR1020::~AR1020() {
delete _enable;
delete _irq;
}
-void AR1020::init()
-{
+void AR1020::init() {
_power->write(1);
wait_ms(100);
- int r=cmd(0x13,NULL,0);
+ int r=cmd(0x13,NULL,0);
printf("disable touch=%i\n",r);
int regStart=cmd(0x22,NULL,0);
@@ -83,192 +79,177 @@
printf("set mode=1 => %i\n",r);
- r=cmd(0x12,NULL,0);
+ r=cmd(0x12,NULL,0);
printf("enable touch=%i\n",r);
_irq->rise(this, &AR1020::read);
}
-int AR1020::x()
-{
+int AR1020::x() {
return _x;
}
-int AR1020::y()
-{
+int AR1020::y() {
return _y;
}
-int AR1020::pen()
-{
+int AR1020::pen() {
return _pen;
}
-void AR1020::read()
-{
- _led->write(1);
- _enable->write(0);
- wait_us(60);
-
- int pen=readByte();
- wait_us(60);
-
- int xlo=readByte();
- wait_us(60);
-
- int xhi=readByte();
- wait_us(60);
-
- int ylo=readByte();
- wait_us(60);
-
- int yhi=readByte();
- _enable->write(1);
+void AR1020::read() {
+ while (1==_sqi->read()) {
+ _led->write(1);
+ _enable->write(0);
+ wait_us(60);
+
+ int pen=readByte();
+ wait_us(60);
+
+ int xlo=readByte();
+ wait_us(60);
+
+ int xhi=readByte();
+ wait_us(60);
+
+ int ylo=readByte();
+ wait_us(60);
+
+ int yhi=readByte();
+ _enable->write(1);
// printf("0x%x|0x%x|0x%x|0x%x|0x%x\n", pen,xlo,xhi,ylo,yhi);
- if (0x4d==pen || 0==pen || 255==pen)
- {
- // ignore invalid stuff, do nothing...
- }
- else if (0x81!=pen&0x81) // pen set?
- {
- _pen=0;
- int x=xlo+(xhi<<7);
- int y=ylo+(yhi<<7);
- if (0!=x&&0!=y)
- {
- _x=x;
- _y=y;
+ if (0x4d==pen || 0==pen || 255==pen) {
+ // ignore invalid stuff, do nothing...
+ } else if (0x81!=pen&0x81) { // pen set?
+ _pen=0;
+ int x=xlo+(xhi<<7);
+ int y=ylo+(yhi<<7);
+ if (0!=x&&0!=y) {
+ _x=x;
+ _y=y;
+ }
+ } else {
+ _pen=1;
+ int x=xlo+(xhi<<7);
+ int y=ylo+(yhi<<7);
+ if (0!=x&&0!=y) {
+ _x=x;
+ _y=y;
+ }
}
+ _event.x=_x;
+ _event.y=_y;
+ _event.pen=_pen;
+ if (_pen==1 && _oldPen==false) { // pen down
+ _callbackPD.call((uint32_t)&_event);
+ } else if (_pen==1 && _oldPen==true) { // pen moved
+ _callbackPM.call((uint32_t)&_event);
+ } else if (_pen==0 && _oldPen==true) { // pen up
+ _callbackPU.call((uint32_t)&_event);
+ } else {
+ // happens on the first touch (the first report is send with pen=0).
+ }
+ _oldPen=(_pen==1);
+ _led->write(0);
+ if (1==_sqi->read())
+ wait_ms(5);
}
- else
- {
- _pen=1;
- int x=xlo+(xhi<<7);
- int y=ylo+(yhi<<7);
- if (0!=x&&0!=y)
- {
- _x=x;
- _y=y;
- }
- }
- _event.x=_x;
- _event.y=_y;
- _event.pen=_pen;
- if (_pen==1 && _oldPen==false)
- { // pen down
- _callbackPD.call((uint32_t)&_event);
- }
- else if (_pen==1 && _oldPen==true)
- { // pen moved
- _callbackPM.call((uint32_t)&_event);
- }
- else if (_pen==0 && _oldPen==true)
- { // pen up
- _callbackPU.call((uint32_t)&_event);
- }
- else
- {
- // happens on the first touch (the first report is send with pen=0).
- }
- _oldPen=(_pen==1);
- _led->write(0);
}
-int AR1020::cmd(char cmd,char* data, int len)
-{
- _enable->write(1);
- wait_us(1000);
- _enable->write(0);
-
+int AR1020::cmd(char cmd,char* data, int len, bool doEnable) {
+ if (doEnable) {
+ _enable->write(1);
+ wait_us(1000);
+ _enable->write(0);
+ }
+
wait_us(10);
-
+
writeByte(0x55);
wait_us(100);
-
+
writeByte(len+1);
wait_us(100);
-
+
writeByte(cmd);
wait_us(100);
-
- for (int i=0;i<len;i++)
- {
+
+ for (int i=0;i<len;i++) {
writeByte(data[i]);
wait_us(100);
}
Timer t;
t.start();
- while (true)
- {
- wait_us(100);
- if (1==_sqi->read())
- break;
- if (t.read_ms()>1)
- break;
+ while (true) {
+ wait_us(100);
+ if (1==_sqi->read())
+ break;
+ if (t.read_ms()>1)
+ break;
}
char rhead=readByte();
wait_us(100);
- if (rhead!=0x55)
- {
- _enable->write(1);
+ if (rhead!=0x55) {
+ if (doEnable)
+ _enable->write(1);
printf("rh=0x%x\n",rhead);
return -1000;
}
char rlen=readByte();
wait_us(100);
- if (rlen==2)
- {
+ if (rlen==2) {
char r=readByte();
wait_us(100);
char rc=readByte();
wait_us(100);
- _enable->write(1);
+ if (doEnable)
+ _enable->write(1);
if (rc!=cmd)
return -2000;
return -r;
- }
- else if (rlen==3)
- {
+ } else if (rlen==3) {
char r=readByte();
wait_us(100);
char rc=readByte();
wait_us(100);
- if (rc!=cmd)
- {
- _enable->write(1);
+ if (rc!=cmd) {
+ if (doEnable)
+ _enable->write(1);
return -3000;
}
char rd=readByte();
wait_us(100);
- _enable->write(1);
+ if (doEnable)
+ _enable->write(1);
if (r==0)
return rd;
return -r;
- }
- else
- {
- _enable->write(1);
+ } else {
+ if (doEnable)
+ _enable->write(1);
return -4000;
}
}
-void AR1020::calibrate()
-{
+void AR1020::calibrate() {
_irq->rise(NULL);
DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);
- led1=0;led2=0;led3=1;led4=1;
-
- int r=cmd(0x13,NULL,0);
+ led1=0;
+ led2=0;
+ led3=1;
+ led4=1;
+
+ int r=cmd(0x13,NULL,0);
printf("disable touch=%i\n",r);
wait_ms(100);
if (r<0)
return;
led4=0;
-
+
int regStart=cmd(0x22,NULL,0);
printf("reg offset=%i\n",regStart);
@@ -279,7 +260,7 @@
if (regStart<0)
return;
printf("start calibrate\n");
- led3=0;
+ led3=0;
char cid2[4]={0x00,0x0e+regStart,0x01,0x19};
r=cmd(0x21,cid2,4);
printf("set inset=%i\n",r);
@@ -287,17 +268,13 @@
return;
_enable->write(1);
+ wait_us(100);
_enable->write(0);
wait_us(10);
- writeByte(0x55);
- wait_us(100);
- writeByte(0x02);
- wait_us(100);
- writeByte(0x14);
- wait_us(100);
- writeByte(0x04);
-
- wait_ms(10);
+ char cid3[1]={0x04};
+ cmd(0x14,cid3,1,false);
+
+ wait_ms(1);
int resp=readCalibResponse();
printf("status=%i\n",resp);
@@ -317,62 +294,57 @@
led4=1;
resp=readCalibResponse();
printf("status=%i\n",resp);
-
- _enable->write(1);
-
- r=cmd(0x12,NULL,0);
+
+ _enable->write(1);
+
+ r=cmd(0x23,NULL,0);
+ printf("save registers=%i\n",r);
+
+ r=cmd(0x12,NULL,0);
printf("enable touch=%i\n",r);
-
+
_irq->rise(this, &AR1020::read);
-
+
}
-int AR1020::readCalibResponse()
-{
- while (true)
- {
+int AR1020::readCalibResponse() {
+ while (true) {
int r=readByte();
- if (r!=0x55)
- {
- printf("1=0x%x\n",r);
+ if (r!=0x55) {
+// printf("1=0x%x\n",r);
wait_ms(100);
continue;
}
r=readByte();
wait_us(100);
- if (r!=0x02)
- {
+ if (r!=0x02) {
printf("2=0x%x\n",r);
continue;
}
-
+
r=readByte();
wait_us(100);
- if (r!=0x00)
- {
+ if (r!=0x00) {
printf("3=0x%x\n",r);
continue;
}
int rc=readByte();
wait_us(100);
- if (rc!=0x14)
- {
+ if (rc!=0x14) {
printf("4=0x%x\n",r);
continue;
}
-
+
return r;
}
}
-int AR1020::readByte()
-{
+int AR1020::readByte() {
_clk->write(0);
wait_us(10);
int r=0;
- for (int i=0;i<8;i++)
- {
+ for (int i=0;i<8;i++) {
r=r<<1;
_clk->write(1);
wait_us(10);
@@ -385,13 +357,11 @@
return r;
}
-void AR1020::writeByte(char byte)
-{
+void AR1020::writeByte(char byte) {
_clk->write(0);
wait_us(10);
// printf("->0x%x\n",byte);
- for (int i=0;i<8;i++)
- {
+ for (int i=0;i<8;i++) {
int bit=byte>127;
// printf("%i",bit);
_clk->write(1);
AR1020