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2 pfowler 1 
#include <avr/io.h>
2 
#include <avr/wdt.h>
3 
#include <avr/eeprom.h>
4 
#include <avr/interrupt.h>
5 
#include <avr/pgmspace.h>
6 
#include <util/delay.h>
7 
 
8 
#include "config.h"
9 
#include "avrutil.h"
10 
#include "usbdrv.h"
11 
#include "i2cbb.h"
12 
 
13 
#define HW_VERSION 0x01
14 
#define SW_VERSION 0x01
15 
 
16 
#ifndef NULL
17 
#define NULL    ((void *)0)
18 
#endif
19 
 
20 
#define DISPLAYS_ATTACHED 2
21 
#define INPUT_REFRESH 50
9 pfowler 22 
#define FULL_REFRESH  10
2 pfowler 23 
 
24 
#define I2C_GET_VERSION			0x01
25 
#define I2C_SET_DEBUG			0x03
26 
#define I2C_SET_DIGITS			0x05
27 
#define I2C_SET_DECIMAL_PTS		0x08
28 
#define I2C_RESET_ROTARY		0x09
29 
#define I2C_GET_ROTARY_DATA 	0x0a
30 
#define I2C_GET_BUTTON_DATA 	0x0c
31 
 
32 
#define USB_GET_VERSION		01
33 
#define USB_SET_LATCH			20
34 
#define USB_SET_DISPLAY1		21
35 
#define USB_SET_DISPLAY2		22
9 pfowler 36 
#define USB_SET_POINTS			23
2 pfowler 37 
#define USB_GET_INPUT			30
38 
 
39 
 
40 
void usbEventResetReady(void);
41 
static void calibrateOscillator(void);
42 
static void updateDisplay(uint8_t dis);
43 
static void updateInput();
44 
static void getDisplayVersion(uint8_t dis);
45 
 
46 
struct display_type {
47 
	uint8_t address;
48 
	uint8_t value[10];
49 
	uint16_t decpts;
50 
	uint16_t version;	// HB = HW, LB = SW
51 
 
9 pfowler 52 
	uint8_t refresh;	// Decimal point refresh
53 
 
2 pfowler 54 
	int8_t rotary;		// State of the rotary encoder
55 
	uint8_t buttons;	// State of the buttons
56 
} display[DISPLAYS_ATTACHED];
57 
 
58 
 
59 
 
60 
static uint8_t usbReplyBuf[8];
61 
static uint8_t latchDisplay = 255;
62 
 
63 
 
64 
volatile uint8_t tmr0_ovf = 0;
65 
 
66 
 
67 
int main(void) {
68 
	// calibration value from last time
69 
	uchar   calibrationValue;
70 
	calibrationValue = eeprom_read_byte(0);
71 
	if(calibrationValue != 0xff){
72 
		OSCCAL = calibrationValue;
73 
	}
74 
 
75 
	/*
76 
		DDR : 1 = Output, 0 = Input
77 
		PORT: 1 = Pullup for Input, otherwise set output
78 
		PIN : Read input pin
79 
 
80 
		PB0	-
81 
		PB1	- 		- USB D- Low Speed
82 
		PB2	-		- USB D+
83 
		PB3	- 		- SCL i2c bb
84 
		PB4	-		- SDA i2c bb
85 
		PB5	-
86 
	*/
87 
	DDRB          = 0B00000001;
88 
	PORTB         = 0B00000001;
89 
 
90 
 
91 
    usbDeviceDisconnect();
92 
    _delay_ms(500);
93 
    usbDeviceConnect();
94 
 
95 
    systime = 0;
96 
    uint32_t refresh = 0;
97 
    sysclockInit();
98 
 
99 
    wdt_enable(WDTO_1S);
100 
    usbInit();
101 
    sei();
102 
 
103 
 
104 
    // Setup the display data, blank each display
105 
    uint8_t i;
106 
    for (i=0; i<DISPLAYS_ATTACHED; i++) {
107 
    	display[i].address = 0x26 + i;
9 pfowler 108 
    	display[i].decpts = 0x0000;
109 
    	display[i].refresh = 0;
2 pfowler 110 
 
111 
    	uint8_t j;
112 
    	for (j=0; j<10; j++)
113 
    		display[i].value[j] = 0x0a;
114 
    	updateDisplay(i);
115 
 
116 
    	getDisplayVersion(i);
117 
    }
118 
 
119 
    for(;;){
120 
    	 wdt_reset();
121 
    	 usbPoll();
122 
 
123 
    	// Latch requests from the the USB host
124 
    	if (latchDisplay != 255) {
125 
    		updateDisplay(latchDisplay);
126 
    		latchDisplay = 255;
127 
    	}
128 
 
9 pfowler 129 
    	for (i=0; i<DISPLAYS_ATTACHED; i++) {
130 
    		if (display[i].refresh) {
131 
    			i2cbb_Init();
132 
				i2cbb_Start();
133 
				i2cbb_Write( display[i].address << 1 );
134 
				i2cbb_Write( I2C_SET_DECIMAL_PTS );
135 
				i2cbb_Write((uint8_t)(display[i].decpts>>8));
136 
				i2cbb_Write((uint8_t)display[i].decpts);
137 
				i2cbb_Stop();
138 
				display[i].refresh = 0;
139 
    		}
140 
 
141 
    	}
142 
 
2 pfowler 143 
    	// Refresh time for getting user input data
144 
		if (systime > refresh) {
145 
			refresh = systime + INPUT_REFRESH;
146 
			updateInput();
147 
		}
148 
    }
149 
    return 0;
150 
}
151 
 
152 
static void getDisplayVersion(uint8_t dis) {
153 
	uint8_t hw = 0x00;
154 
	uint8_t sw = 0x00;
155 
 
156 
	i2cbb_Init();
157 
	i2cbb_Start();
158 
	i2cbb_Write( display[dis].address << 1 );
159 
	i2cbb_Write( I2C_GET_VERSION );
160 
	i2cbb_Stop();
161 
 
162 
	i2cbb_Start();
163 
	i2cbb_Write( (display[dis].address << 1) + 1 );
164 
	hw += (int8_t)i2cbb_Read(1);
165 
	sw += (int8_t)i2cbb_Read(1);
166 
	i2cbb_Stop();
167 
 
168 
	display[dis].version = ((uint16_t)hw << 8) | ((uint16_t)sw);
169 
}
170 
 
171 
// Get the user input data from each display board
172 
static void updateInput() {
173 
	uint8_t i;
174 
	for (i = 0; i < DISPLAYS_ATTACHED; i++) {
175 
		// Request for the rotary data
176 
		i2cbb_Init();
177 
		i2cbb_Start();
178 
		i2cbb_Write( display[i].address << 1 );
179 
		i2cbb_Write( I2C_GET_ROTARY_DATA );
180 
		i2cbb_Stop();
181 
 
182 
		// Receive rotary data
183 
		i2cbb_Start();
184 
		i2cbb_Write( (display[i].address << 1) + 1 );
185 
		display[i].rotary += (int8_t)i2cbb_Read(1);
186 
		i2cbb_Stop();
187 
 
188 
		// Reset the rotary on display board
189 
		i2cbb_Init();
190 
		i2cbb_Start();
191 
		i2cbb_Write( display[i].address << 1 );
192 
		i2cbb_Write( I2C_RESET_ROTARY );
193 
		i2cbb_Stop();
194 
 
195 
		// Request the button data
196 
		i2cbb_Init();
197 
		i2cbb_Start();
198 
		i2cbb_Write( display[i].address << 1 );
199 
		i2cbb_Write( I2C_GET_BUTTON_DATA );
200 
		i2cbb_Stop();
201 
 
202 
		// Receive the button data
203 
		i2cbb_Start();
204 
		i2cbb_Write( (display[i].address << 1) + 1 );
205 
		display[i].buttons = i2cbb_Read(1);
206 
		i2cbb_Stop();
207 
	}
208 
 
209 
}
210 
 
211 
// The the display digit display buffer to the board
212 
// We can select which display to update as this can
213 
//  get slow if updates are being done all the time,
214 
//  which might affect the user input data tasks
215 
static void updateDisplay(uint8_t dis) {
216 
    cbi(PORTB, PB0);
217 
 
218 
    // Send the display buffer to display board
219 
    uint8_t update = 0;
220 
    uint8_t n;
221 
    for (n=0; n<10; n++) {
222 
    	if (rbi(display[dis].value[n], 7)) {
223 
    		update = 1;
224 
    		break;
225 
    	}
226 
    }
9 pfowler 227 
 
2 pfowler 228 
    if (!update) return;
229 
 
230 
    i2cbb_Init();
231 
    i2cbb_Start();
232 
    i2cbb_Write( display[dis].address << 1);
233 
    i2cbb_Write( I2C_SET_DIGITS );
234 
 
235 
    for (n=0; n<10; n++) {
236 
    	if (rbi(display[dis].value[n], 7)) {
237 
    		cbi(display[dis].value[n], 7);
238 
    		uint8_t send = (n << 4) | display[dis].value[n];
239 
    		i2cbb_Write( send );
240 
    	}
241 
    }
242 
    i2cbb_Stop();
243 
 
244 
    sbi(PORTB, PB0);
245 
}
246 
 
247 
// The USB functions to transmit/receive data from USB host.
248 
usbMsgLen_t usbFunctionSetup(uchar data[8])
249 
{
250 
    usbRequest_t    *rq = (void *)data;
251 
 
252 
	switch (rq->bRequest ) {
253 
		// Request for a display boards digits to be updated
254 
		case USB_SET_LATCH: {
255 
			latchDisplay = rq->wValue.bytes[0];;
256 
			break;
257 
		}
258 
 
9 pfowler 259 
		case USB_SET_POINTS: {
260 
			display[0].decpts = rq->wValue.word;
261 
			display[1].decpts = rq->wIndex.word;
262 
 
263 
			display[0].refresh = 1;
264 
			display[1].refresh = 1;
265 
		}
266 
 
2 pfowler 267 
		// Sets the display boards digit buffer. Only on display
268 
		//  board is updated per request. Also does decimal points
269 
		case USB_SET_DISPLAY1: {
270 
			uint8_t dis = rq->wValue.bytes[1];
271 
			uint8_t dig = rq->wValue.bytes[0];
272 
			uint8_t val = rq->wIndex.bytes[0];
273 
 
274 
			if ((display[dis].value[dig] & 0x0f) != val) {
275 
				display[dis].value[dig] = val;
276 
				sbi(display[dis].value[dig], 7);
277 
			}
278 
			break;
279 
		}
280 
 
281 
		// Return the user input data all at once. Its populated from
282 
		//  buffered data from the updateInput() function.
283 
		case USB_GET_INPUT: {
284 
			uint8_t i;
285 
			for (i=0; i<DISPLAYS_ATTACHED; i++) {
286 
				usbReplyBuf[(i*2)] = display[i].buttons;
287 
				usbReplyBuf[(i*2+1)] = display[i].rotary;
288 
				display[i].rotary = 0;
289 
			}
290 
			usbMsgPtr = usbReplyBuf;
291 
			return sizeof(usbReplyBuf);
292 
			break;
293 
		}
294 
 
295 
		// Return the version numbers for the controller board
296 
		//  and for all attached display boards.
297 
		case USB_GET_VERSION: {
298 
			usbReplyBuf[0] = HW_VERSION;
299 
			usbReplyBuf[1] = SW_VERSION;
300 
			uint8_t i;
301 
			for (i=0; i<DISPLAYS_ATTACHED; i++) {
302 
				usbReplyBuf[2+(i*2)] = (uint8_t)(display[i].version >> 8);
303 
				usbReplyBuf[2+(i*2)+1] = (uint8_t)(display[i].version && 0xff);
304 
			}
305 
			usbMsgPtr = usbReplyBuf;
306 
			return sizeof(usbReplyBuf);
307 
			break;
308 
		}
309 
 
310 
	}
311 
	return 0;
312 
}
313 
 
314 
static void calibrateOscillator(void) {
315 
    uchar step = 128;
316 
    uchar trialValue = 0, optimumValue;
317 
    int x, optimumDev;
318 
    int targetValue = (unsigned)(1499 * (double)F_CPU / 10.5e6 + 0.5);
319 
 
320 
    /* do a binary search: */
321 
    do {
322 
        OSCCAL = trialValue + step;
323 
        x = usbMeasureFrameLength();    /* proportional to current real frequency */
324 
        if(x < targetValue)             /* frequency still too low */
325 
            trialValue += step;
326 
        step >>= 1;
327 
    } while(step > 0);
328 
    /* We have a precision of +/- 1 for optimum OSCCAL here */
329 
    /* now do a neighborhood search for optimum value */
330 
    optimumValue = trialValue;
331 
    optimumDev = x; /* this is certainly far away from optimum */
332 
    for(OSCCAL = trialValue - 1; OSCCAL <= trialValue + 1; OSCCAL++){
333 
        x = usbMeasureFrameLength() - targetValue;
334 
        if(x < 0)
335 
            x = -x;
336 
        if(x < optimumDev){
337 
            optimumDev = x;
338 
            optimumValue = OSCCAL;
339 
        }
340 
    }
341 
    OSCCAL = optimumValue;
342 
}
343 
 
344 
 
345 
void usbEventResetReady(void) {
346 
    cli();
347 
    calibrateOscillator();
348 
    sei();
349 
    eeprom_write_byte(0, OSCCAL);   /* store the calibrated value in EEPROM */
350 
}
351 
 
352 
ISR(TIM0_OVF_vect) {
353 
 
354 
	tmr0_ovf++;
355 
 
356 
	// Clk/1 TCCR0B = (1<< CS00);
357 
	//20.0Mhz, 1ms = 78ovf
358 
	//16.5Mhz, 1ms = 64ovf
359 
	//16.0Mhz, 1ms = 62ovf
360 
	//12.0Mhz, 1ms = 46ovf
361 
	// 8.0Mhz, 1ms = 31ovf
362 
	// 8.0Mhz, .5ms = 15ovf, 160r
363 
 
364 
	if (tmr0_ovf>=64) {
365 
			systime++;
366 
			tmr0_ovf = 0;
367 
	}
368 
 
369 
}