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