alphawatch / alphawatch.c

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/**
 * \file Alpha numeric watch
 *
 * Based on the HDSP-2110 display.
 *
 */

#include <avr/io.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
#include <stdint.h>
#include <string.h>
#include <util/delay.h>
#include "usb_serial.h"
#include "bits.h"


#define LED			0xD6


void send_str(const char *s);
uint8_t recv_str(char *buf, uint8_t size);
void parse_and_execute_command(const char *buf, uint8_t num);

static uint8_t
hexdigit(
	uint8_t x
)
{
	x &= 0xF;
	if (x < 0xA)
		return x + '0' - 0x0;
	else
		return x + 'A' - 0xA;
}



// Send a string to the USB serial port.  The string must be in
// flash memory, using PSTR
//
void send_str(const char *s)
{
	char c;
	while (1) {
		c = pgm_read_byte(s++);
		if (!c) break;
		usb_serial_putchar(c);
	}
}

#define CHAR_RAM 0x18


#define ADDR_0	0xF4
#define ADDR_1	0xF5
#define ADDR_2	0xF6
#define ADDR_3	0xF7
#define ADDR_4	0xD7

#define DATA_0	0xC6
#define DATA_1	0xD3
#define DATA_2	0xD0
#define DATA_3	0xB7
#define DATA_4	0xB3
#define DATA_5	0xB2
#define DATA_6	0xB1
#define DATA_7	0xB0

#define FLASH	0xF1
#define RESET	0xF0
#define WRCE	0xD5
#define RD	0xC7
#define CLKSEL	0xD6

#define BUTTON	0xD1

static const char numbers[][16] = {
	"",
	"one",
	"two",
	"three",
	"four",
	"five",
	"six",
	"seven",
	"eight",
	"nine",
	"ten",
	"eleven",
	"twelve",
	"thirteen",
	"fourteen",
	"a quarter",
	"sixteen",
	"seventeen",
	"eightteen",
	"nineteen",
	"twenty",
	"twenty one",
	"twenty two",
	"twenty three",
	"twenty four",
	"twenty five",
	"twenty six",
	"twenty seven",
	"twenty eight",
	"twenty nine",
	"half",
};


static void
lcd_write(
	uint8_t addr,
	uint8_t data
)
{
	out(ADDR_0, addr & 1); addr >>= 1;
	out(ADDR_1, addr & 1); addr >>= 1;
	out(ADDR_2, addr & 1); addr >>= 1;
	out(ADDR_3, addr & 1); addr >>= 1;
	out(ADDR_4, addr & 1); addr >>= 1;

	out(DATA_0, data & 1); data >>= 1;
	out(DATA_1, data & 1); data >>= 1;
	out(DATA_2, data & 1); data >>= 1;
	out(DATA_3, data & 1); data >>= 1;
	out(DATA_4, data & 1); data >>= 1;
	out(DATA_5, data & 1); data >>= 1;
	out(DATA_6, data & 1); data >>= 1;
	out(DATA_7, data & 1); data >>= 1;

	//_delay_us(100);
	out(WRCE, 0);
	_delay_us(10);
	out(WRCE, 1);
}

static uint8_t ms;
static uint8_t sec;
static uint8_t min;
static uint8_t hour;

static void
update_time(void)
{
	if (++ms < 200)
		return;

	ms = 0;
	if (++sec< 60)
		return;

	sec = 0;
	if (++min < 60)
		return;

	min = 0;
	if (++hour < 24)
		return;

	hour = 0;
}


static char scroll_output[64];
static uint8_t scroll_offset;

static void
scroll(void)
{
	uint8_t did_reset = 0;

	for (int i = 0 ; i < 8 ; i++)
	{
		char c = scroll_output[scroll_offset+i];
		if (did_reset || c == '\0')
		{
			did_reset = 1;
			c = ' ';
		}
	
		lcd_write(CHAR_RAM + i, c);
	}

	if (did_reset)
		scroll_offset = 0;
	else
		scroll_offset++;
}


static void
draw_hms(void)
{
	lcd_write(CHAR_RAM | 0, '0' + (hour / 10) % 10);
	lcd_write(CHAR_RAM | 1, '0' + (hour / 1) % 10);
	lcd_write(CHAR_RAM | 2, ':');
	lcd_write(CHAR_RAM | 3, '0' + (min / 10) % 10);
	lcd_write(CHAR_RAM | 4, '0' + (min / 1) % 10);
	lcd_write(CHAR_RAM | 5, ':');
	lcd_write(CHAR_RAM | 6, '0' + (sec / 10) % 10);
	lcd_write(CHAR_RAM | 7, '0' + (sec / 1) % 10);
}


static void
hour_output(
	uint8_t hour
)
{
	if (hour == 0 || hour == 24)
	{
		strcat(scroll_output, "midnight");
	} else
	if (hour < 12)
	{
		strcat(scroll_output, numbers[hour+1]);
		strcat(scroll_output, " in the morning");
	} else
	if (hour == 12)
	{
		strcat(scroll_output, "noon");
	} else
	if (hour < 17)
	{
		strcat(scroll_output, numbers[hour-12]);
		strcat(scroll_output, " in the afternoon");
	} else {
		strcat(scroll_output, numbers[hour-12]);
		strcat(scroll_output, " in the evening");
	}
}

static void
word_clock(void)
{
	scroll_output[0] = '\0';
	strcat(scroll_output, "       ");

	if (min <= 30)
	{
		if (min != 0)
		{
			strcat(scroll_output, numbers[min]);
			strcat(scroll_output, " past ");
		}

		if (hour == 12)
			strcat(scroll_output, "noon");
		else
		if (hour == 0)
			strcat(scroll_output, "midnight");
		else
			strcat(scroll_output, numbers[hour]);
	} else {
		strcat(scroll_output, numbers[60-min]);
		strcat(scroll_output, " before ");
		hour_output(hour + 1);
	}

	strcat(scroll_output, "      ");
}


int
main(void)
{
	// set for 16 MHz clock
#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
	CPU_PRESCALE(0);

	// Disable the ADC
	ADMUX = 0;

	// initialize the USB, and then wait for the host
	// to set configuration.  If the Teensy is powered
	// without a PC connected to the USB port, this 
	// will wait forever.
	usb_init();

	// LED is an output; will be pulled down once connected
	ddr(LED, 1);
	out(LED, 1);

	ddr(DATA_0, 1);
	ddr(DATA_1, 1);
	ddr(DATA_2, 1);
	ddr(DATA_3, 1);
	ddr(DATA_4, 1);
	ddr(DATA_5, 1);
	ddr(DATA_6, 1);
	ddr(DATA_7, 1);

	ddr(ADDR_0, 1);
	ddr(ADDR_1, 1);
	ddr(ADDR_2, 1);
	ddr(ADDR_3, 1);
	ddr(ADDR_4, 1);

	// !FLASH should be high to select normal memory
	out(FLASH, 1);
	ddr(FLASH, 1);

	// CLS should be high to select internal clocks
	out(CLKSEL, 1);
	ddr(CLKSEL, 1);

	// WRCE ties together !WR and !CE
	out(WRCE, 1);
	ddr(WRCE, 1);

	out(RESET, 1);
	ddr(RESET, 1);

	// Reset the display
	_delay_ms(100);
	out(RESET, 0);
	_delay_ms(10);
	out(RESET, 1);

	// The push button is pull up and will be grounded when pressed
	ddr(BUTTON, 0);
	out(BUTTON, 1);

	uint8_t bright = 3;

	// We should be good to go
	//lcd_write(0x20, 0x00); // normal operation
	lcd_write(0x10, 0x00 | bright); // normal operation

	lcd_write(CHAR_RAM | 0, 'A');
	lcd_write(CHAR_RAM | 1, 'l');
	lcd_write(CHAR_RAM | 2, 'p');
	lcd_write(CHAR_RAM | 3, 'h');
	lcd_write(CHAR_RAM | 4, 'a');
	lcd_write(CHAR_RAM | 5, 'C');
	lcd_write(CHAR_RAM | 6, 'L');
	lcd_write(CHAR_RAM | 7, 'K');

        // Timer 0 is used for a 64 Hz control loop timer.
        // Clk/1024 == 15.625 KHz, count up to 244
        // CTC mode resets the counter when it hits the top
        TCCR0A = 0
                | 1 << WGM01 // select CTC
                | 0 << WGM00
                ;

        TCCR0B = 0
                | 0 << WGM02
                | 1 << CS02 // select Clk/1024
                | 0 << CS01
                | 0 << CS00
                ;

        OCR0A = 244;
        sbi(TIFR0, OCF0A); // reset the overflow bit


	while (!usb_configured())
		;

	_delay_ms(1000);

	// wait for the user to run their terminal emulator program
	// which sets DTR to indicate it is ready to receive.
	while (!(usb_serial_get_control() & USB_SERIAL_DTR))
		;

	// discard anything that was received prior.  Sometimes the
	// operating system or other software will send a modem
	// "AT command", which can still be buffered.
	usb_serial_flush_input();

	send_str(PSTR("alphawatch\r\n"));
	char line[16];
	uint8_t line_offset = 0;
	uint8_t last_button = 0;
	uint8_t mode = 1;
	const uint8_t NUM_MODES = 2;
	const uint8_t timeout = 1;

	while (1)
	{
		if (!in(BUTTON))
		{
			if (last_button == 0xff || sec - last_button >= timeout)
			{
				last_button = sec;
				mode = (mode + 1) % NUM_MODES;
			}
		} else {
			last_button = 0xFF;
		}

		int c = usb_serial_getchar();
		if (c != -1)
		{
			usb_serial_putchar(c);

			if (c == '-')
			{
				if (bright < 7)
					bright++;
			} else
			if (c == '+')
			{
				if (bright > 0)
					bright--;
			}

			if (c == '\r')
			{
				hour = (line[0] - '0') * 10 + (line[1] - '0');
				min = (line[2] - '0') * 10 + (line[3] - '0');
				sec = (line[4] - '0') * 10 + (line[5] - '0');
				line_offset = 0;
			} else {
				line[line_offset++] = c;
			}

			lcd_write(0x10, 0x00 | bright); // normal operation
		}

		if (bit_is_clear(TIFR0, OCF0A))
			continue;
		sbi(TIFR0, OCF0A); // reset the bit

		update_time();

		static uint8_t rate = 0;
		if ((rate++) < 40)
			continue;
		rate = 0;

		if (mode == 0)
			draw_hms();
		else
		if (mode == 1)
		{
			word_clock();
			scroll();
		}
	}
}
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