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130 pfowler 1 
#include <avr/io.h>
2 
#include <avr/wdt.h>
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#include <avr/eeprom.h>
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#include <avr/interrupt.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
7 
 
8 
#include "config.h"
9 
#include "avrutil.h"
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#include "usbdrv.h"
11 
#include "i2cbb.h"
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#define HW_VERSION 0x01
14 
#define SW_VERSION 0x01
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16 
#ifndef NULL
17 
#define NULL    ((void *)0)
18 
#endif
19 
 
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#define DISPLAYS_ATTACHED 2
21 
#define INPUT_REFRESH 5
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 
 
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void usbEventResetReady(void);
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static void calibrateOscillator(void);
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static void updateDisplay(uint8_t dis);
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static void updateInput();
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static void getDisplayVersion(uint8_t dis);
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struct display_type {
45 
	uint8_t address;
46 
	uint8_t value[10];
47 
	uint16_t decpts;
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	uint16_t version;	// HB = HW, LB = SW
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	int8_t rotary;		// State of the rotary encoder
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	uint8_t buttons;	// State of the buttons
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} display[DISPLAYS_ATTACHED];
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55 
 
56 
static uint8_t usbReplyBuf[8];
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static uint8_t latchDisplay = 255;
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59 
 
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volatile uint8_t tmr0_ovf = 0;
61 
 
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130 pfowler 63 
int main(void) {
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	// calibration value from last time
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	uchar   calibrationValue;
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	calibrationValue = eeprom_read_byte(0);
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	if(calibrationValue != 0xff){
68 
		OSCCAL = calibrationValue;
69 
	}
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	/*
72 
		DDR : 1 = Output, 0 = Input
73 
		PORT: 1 = Pullup for Input, otherwise set output
74 
		PIN : Read input pin
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		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 
 
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136 pfowler 87 
    usbDeviceDisconnect();
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    _delay_ms(500);
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    usbDeviceConnect();
90 
 
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    systime = 0;
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    uint32_t refresh = 0;
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    sysclockInit();
94 
 
139 pfowler 95 
    wdt_enable(WDTO_1S);
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    usbInit();
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    sei();
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    // Setup the display data, blank each display
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    uint8_t i;
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    for (i=0; i<DISPLAYS_ATTACHED; i++) {
103 
    	display[i].address = 0x26 + i;
104 
    	display[i].decpts = 0x00;
105 
 
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    	uint8_t j;
107 
    	for (j=0; j<10; j++)
108 
    		display[i].value[j] = 0x0a;
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    	updateDisplay(i);
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111 
    	getDisplayVersion(i);
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    }
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    for(;;){
115 
    	 wdt_reset();
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    	 usbPoll();
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    	// Latch requests from the the USB host
119 
    	if (latchDisplay != 255) {
120 
    		updateDisplay(latchDisplay);
121 
    		latchDisplay = 255;
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    	}
123 
 
152 pfowler 124 
    	// Refresh time for getting user input data
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		if (systime > refresh) {
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			refresh = systime + INPUT_REFRESH;
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			updateInput();
128 
		}
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    }
130 
    return 0;
131 
}
132 
 
152 pfowler 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 
	// Receive rotary data
144 
	i2cbb_Start();
145 
	i2cbb_Write( (display[dis].address << 1) + 1 );
146 
	hw += (int8_t)i2cbb_Read(1);
147 
	sw += (int8_t)i2cbb_Read(1);
148 
	i2cbb_Stop();
149 
 
150 
	display[dis].version = ((uint16_t)hw << 8) | ((uint16_t)sw);
151 
}
152 
 
153 
// Get the user input data from each display board
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static void updateInput() {
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	uint8_t i;
156 
	for (i = 0; i < DISPLAYS_ATTACHED; i++) {
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		// Request for the rotary data
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		i2cbb_Init();
159 
		i2cbb_Start();
160 
		i2cbb_Write( display[i].address << 1 );
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		i2cbb_Write( I2C_GET_ROTARY_DATA );
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		i2cbb_Stop();
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152 pfowler 164 
		// Receive rotary data
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		i2cbb_Start();
166 
		i2cbb_Write( (display[i].address << 1) + 1 );
167 
		display[i].rotary += (int8_t)i2cbb_Read(1);
168 
		i2cbb_Stop();
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		// Reset the rotary on display board
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		i2cbb_Init();
172 
		i2cbb_Start();
173 
		i2cbb_Write( display[i].address << 1 );
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		i2cbb_Write( I2C_RESET_ROTARY );
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		i2cbb_Stop();
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		// Request the button data
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		i2cbb_Init();
179 
		i2cbb_Start();
180 
		i2cbb_Write( display[i].address << 1 );
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		i2cbb_Write( I2C_GET_BUTTON_DATA );
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		i2cbb_Stop();
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152 pfowler 184 
		// Receive the button data
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		i2cbb_Start();
186 
		i2cbb_Write( (display[i].address << 1) + 1 );
187 
		display[i].buttons = i2cbb_Read(1);
188 
		i2cbb_Stop();
189 
	}
139 pfowler 190 
 
191 
}
192 
 
152 pfowler 193 
// The the display digit display buffer to the board
194 
// We can select which display to update as this can
195 
//  get slow if updates are being done all the time,
196 
//  which might affect the user input data tasks
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static void updateDisplay(uint8_t dis) {
198 
    cbi(PORTB, PB0);
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200 
    // Send the display buffer to display board
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    i2cbb_Init();
202 
    i2cbb_Start();
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    i2cbb_Write( display[dis].address << 1);
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    i2cbb_Write( I2C_SET_DIGITS );
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    uint8_t n;
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    for (n=0; n<10; n++) {
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    	uint8_t send = (n << 4) | display[dis].value[n];
139 pfowler 208 
    	i2cbb_Write( send );
137 pfowler 209 
    }
210 
    i2cbb_Stop();
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    // Send the decimal point
214 
	i2cbb_Init();
215 
	i2cbb_Start();
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	i2cbb_Write( display[dis].address << 1 );
217 
	i2cbb_Write( I2C_SET_DECIMAL_PTS );
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	i2cbb_Write((uint8_t)(display[dis].decpts>>8));
219 
	i2cbb_Write((uint8_t)display[dis].decpts);
220 
	i2cbb_Stop();
221 
 
152 pfowler 222 
 
137 pfowler 223 
    sbi(PORTB, PB0);
224 
}
225 
 
152 pfowler 226 
// The USB functions to transmit/receive data from USB host.
139 pfowler 227 
usbMsgLen_t usbFunctionSetup(uchar data[8])
228 
{
229 
    usbRequest_t    *rq = (void *)data;
136 pfowler 230 
 
139 pfowler 231 
	switch (rq->bRequest ) {
152 pfowler 232 
		// Request for a display boards digits to be updated
139 pfowler 233 
		case USB_SET_LATCH: {
152 pfowler 234 
			latchDisplay = rq->wValue.bytes[0];;
139 pfowler 235 
			break;
236 
		}
152 pfowler 237 
 
238 
		// Sets the display boards digit buffer. Only on display
239 
		//  board is updated per request. Also does decimal points
139 pfowler 240 
		case USB_SET_DISPLAY1: {
241 
			uint8_t dis = rq->wValue.bytes[1];
242 
			uint8_t dig = rq->wValue.bytes[0];
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			uint8_t dp = rq->wIndex.bytes[1];
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			uint8_t val = rq->wIndex.bytes[0];
245 
			display[dis].value[dig] = val;
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139 pfowler 247 
			if (dp)
248 
				sbi(display[dis].decpts, 1 << dig);
249 
			else
250 
				cbi(display[dis].decpts, 1 << dig);
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252 
			//display[dis].decpts |= dp << dig;
253 
 
139 pfowler 254 
			break;
255 
		}
152 pfowler 256 
 
257 
		// Return the user input data all at once. Its populated from
258 
		//  buffered data from the updateInput() function.
139 pfowler 259 
		case USB_GET_INPUT: {
150 pfowler 260 
			uint8_t i;
261 
			for (i=0; i<DISPLAYS_ATTACHED; i++) {
262 
				usbReplyBuf[(i*2)] = display[i].buttons;
263 
				usbReplyBuf[(i*2+1)] = display[i].rotary;
264 
				display[i].rotary = 0;
265 
			}
152 pfowler 266 
			usbMsgPtr = usbReplyBuf;
267 
			return sizeof(usbReplyBuf);
268 
			break;
269 
		}
150 pfowler 270 
 
152 pfowler 271 
		// Return the version numbers for the controller board
272 
		//  and for all attached display boards.
273 
		case USB_GET_VERSION: {
274 
			usbReplyBuf[0] = HW_VERSION;
275 
			usbReplyBuf[1] = SW_VERSION;
276 
			uint8_t i;
277 
			for (i=0; i<DISPLAYS_ATTACHED; i++) {
278 
				usbReplyBuf[2+(i*2)] = (uint8_t)(display[i].version >> 8);
279 
				usbReplyBuf[2+(i*2)+1] = (uint8_t)(display[i].version && 0xff);
280 
			}
139 pfowler 281 
			usbMsgPtr = usbReplyBuf;
282 
			return sizeof(usbReplyBuf);
152 pfowler 283 
			break;
139 pfowler 284 
		}
285 
 
286 
	}
287 
	return 0;
136 pfowler 288 
}
289 
 
290 
static void calibrateOscillator(void) {
291 
    uchar step = 128;
292 
    uchar trialValue = 0, optimumValue;
293 
    int x, optimumDev;
294 
    int targetValue = (unsigned)(1499 * (double)F_CPU / 10.5e6 + 0.5);
295 
 
296 
    /* do a binary search: */
297 
    do {
298 
        OSCCAL = trialValue + step;
299 
        x = usbMeasureFrameLength();    /* proportional to current real frequency */
300 
        if(x < targetValue)             /* frequency still too low */
301 
            trialValue += step;
302 
        step >>= 1;
303 
    } while(step > 0);
304 
    /* We have a precision of +/- 1 for optimum OSCCAL here */
305 
    /* now do a neighborhood search for optimum value */
306 
    optimumValue = trialValue;
307 
    optimumDev = x; /* this is certainly far away from optimum */
308 
    for(OSCCAL = trialValue - 1; OSCCAL <= trialValue + 1; OSCCAL++){
309 
        x = usbMeasureFrameLength() - targetValue;
310 
        if(x < 0)
311 
            x = -x;
312 
        if(x < optimumDev){
313 
            optimumDev = x;
314 
            optimumValue = OSCCAL;
315 
        }
316 
    }
317 
    OSCCAL = optimumValue;
318 
}
319 
 
320 
 
321 
void usbEventResetReady(void) {
322 
    cli();
323 
    calibrateOscillator();
324 
    sei();
325 
    eeprom_write_byte(0, OSCCAL);   /* store the calibrated value in EEPROM */
326 
}
327 
 
132 pfowler 328 
ISR(TIM0_OVF_vect) {
130 pfowler 329 
 
132 pfowler 330 
	tmr0_ovf++;
130 pfowler 331 
 
332 
	// Clk/1 TCCR0B = (1<< CS00);
333 
	//20.0Mhz, 1ms = 78ovf
334 
	//16.5Mhz, 1ms = 64ovf
335 
	//16.0Mhz, 1ms = 62ovf
336 
	//12.0Mhz, 1ms = 46ovf
337 
	// 8.0Mhz, 1ms = 31ovf
131 pfowler 338 
	// 8.0Mhz, .5ms = 15ovf, 160r
130 pfowler 339 
 
132 pfowler 340 
	if (tmr0_ovf>=64) {
130 pfowler 341 
			systime++;
342 
			tmr0_ovf = 0;
343 
	}
344 
 
345 
}