SPI_LCD - This is a sample program to drive a 128x128 LCD w…

Users » gertk » Code » SPI_LCD

Gert van der Knokke / Mbed 2 deprecated SPI_LCD

This is a sample program to drive a 128x128 LCD with t6963 controller through SPI by means of an MCP23S17 16-Bit I/O Expander with Serial Interface

Dependencies: mbed

main.cpp@4:fd7c6559a56d, 2011-10-17 (annotated)

Committer:: gertk
Date:: Mon Oct 17 10:24:14 2011 +0000
Revision:: 4:fd7c6559a56d
Parent:: 3:fc101c00b5be

Who changed what in which revision?

User	Revision	Line number	New contents of line
gertk	4:fd7c6559a56d	1	// Demo program displaying an analog clock
gertk	4:fd7c6559a56d	2	// on a T6963 based LCD connected to the mbed through
gertk	4:fd7c6559a56d	3	// SPI with a MCP23S17 thereby using only 4 pins I/O
gertk	4:fd7c6559a56d	4	// by Gert van der Knokke 2010
gertk	3:fc101c00b5be	5	#include "mbed.h"
gertk	3:fc101c00b5be	6	#include "mcp_lcd.h"
gertk	3:fc101c00b5be	7
gertk	3:fc101c00b5be	8	// for 21 characters on a row (6x8 font)
gertk	3:fc101c00b5be	9	#define LCDFONTSEL 0xFF
gertk	3:fc101c00b5be	10	// for 16 characters on a row (8x8 font)
gertk	3:fc101c00b5be	11	// #define LCDFONTSEL 0xDF
gertk	3:fc101c00b5be	12
gertk	3:fc101c00b5be	13	// lcd dimensions in pixels
gertk	3:fc101c00b5be	14	#define LCD_XWIDTH 128
gertk	3:fc101c00b5be	15	#define LCD_YHEIGHT 128
gertk	3:fc101c00b5be	16
gertk	3:fc101c00b5be	17	#if LCDFONTSEL == 0xFF
gertk	3:fc101c00b5be	18	// lcd dimensions in characters
gertk	3:fc101c00b5be	19	#define LCD_WIDTH 22
gertk	3:fc101c00b5be	20	#define LCD_HEIGHT 16
gertk	3:fc101c00b5be	21	#define PIXELWIDTH 6
gertk	3:fc101c00b5be	22	#else
gertk	3:fc101c00b5be	23	#define LCD_WIDTH 16
gertk	3:fc101c00b5be	24	#define LCD_HEIGHT 16
gertk	3:fc101c00b5be	25	#define PIXELWIDTH 8
gertk	3:fc101c00b5be	26	#endif
gertk	3:fc101c00b5be	27
gertk	3:fc101c00b5be	28	#define TEXT_STARTADDRESS 0x0000
gertk	3:fc101c00b5be	29	#define GRAPHIC_STARTADDRESS 0x1000
gertk	3:fc101c00b5be	30
gertk	3:fc101c00b5be	31
gertk	3:fc101c00b5be	32	#define CENTERX 64
gertk	3:fc101c00b5be	33	#define CENTERY 64
gertk	3:fc101c00b5be	34	#define INNER_RADIUS 45
gertk	3:fc101c00b5be	35	#define OUTER_RADIUS 50
gertk	3:fc101c00b5be	36	#define CENTER_CIRCLE 5
gertk	3:fc101c00b5be	37
gertk	3:fc101c00b5be	38	DigitalOut myled(LED1);
gertk	3:fc101c00b5be	39	SPI spi(p5, p6, p7); // mosi, miso, sclk
gertk	3:fc101c00b5be	40	DigitalOut cs(p20);
gertk	3:fc101c00b5be	41
gertk	3:fc101c00b5be	42	Serial pc(USBTX, USBRX); // tx, rx
gertk	3:fc101c00b5be	43
gertk	3:fc101c00b5be	44
gertk	3:fc101c00b5be	45	// write 8 bits lcd data
gertk	3:fc101c00b5be	46	void lcd_data(unsigned char d)
gertk	3:fc101c00b5be	47	{
gertk	3:fc101c00b5be	48	cs=0;
gertk	3:fc101c00b5be	49	spi.write(0x40);
gertk	3:fc101c00b5be	50	spi.write(GPIOB); // select GPIOB
gertk	3:fc101c00b5be	51	spi.write(d); // set data byte
gertk	3:fc101c00b5be	52	cs=1;
gertk	3:fc101c00b5be	53
gertk	3:fc101c00b5be	54	cs=0;
gertk	3:fc101c00b5be	55	spi.write(0x40);
gertk	3:fc101c00b5be	56	spi.write(GPIOA); // select GPIOA
gertk	3:fc101c00b5be	57	spi.write(LCDFONTSEL-LCD_CE-LCD_CD);
gertk	3:fc101c00b5be	58	cs=1;
gertk	3:fc101c00b5be	59
gertk	3:fc101c00b5be	60	cs=0;
gertk	3:fc101c00b5be	61	spi.write(0x40);
gertk	3:fc101c00b5be	62	spi.write(GPIOA); // select GPIOA
gertk	3:fc101c00b5be	63	spi.write(LCDFONTSEL - LCD_WR - LCD_CE - LCD_CD);
gertk	3:fc101c00b5be	64	cs=1;
gertk	3:fc101c00b5be	65
gertk	3:fc101c00b5be	66	cs=0;
gertk	3:fc101c00b5be	67	spi.write(0x40);
gertk	3:fc101c00b5be	68	spi.write(GPIOA); // select GPIOA
gertk	3:fc101c00b5be	69	spi.write(LCDFONTSEL - LCD_CD);
gertk	3:fc101c00b5be	70	cs=1;
gertk	3:fc101c00b5be	71
gertk	3:fc101c00b5be	72	}
gertk	3:fc101c00b5be	73
gertk	3:fc101c00b5be	74	// write 8 bits lcd command
gertk	3:fc101c00b5be	75	void lcd_command(unsigned char c)
gertk	3:fc101c00b5be	76	{
gertk	3:fc101c00b5be	77	cs=0;
gertk	3:fc101c00b5be	78	spi.write(0x40);
gertk	3:fc101c00b5be	79	spi.write(GPIOB); // select GPIOB
gertk	3:fc101c00b5be	80	spi.write(c); // set data byte
gertk	3:fc101c00b5be	81	cs=1;
gertk	3:fc101c00b5be	82
gertk	3:fc101c00b5be	83	cs=0;
gertk	3:fc101c00b5be	84	spi.write(0x40);
gertk	3:fc101c00b5be	85	spi.write(GPIOA); // select GPIOA
gertk	3:fc101c00b5be	86	spi.write(LCDFONTSEL-LCD_CE);
gertk	3:fc101c00b5be	87	cs=1;
gertk	3:fc101c00b5be	88
gertk	3:fc101c00b5be	89	cs=0;
gertk	3:fc101c00b5be	90	spi.write(0x40);
gertk	3:fc101c00b5be	91	spi.write(GPIOA); // select GPIOA
gertk	3:fc101c00b5be	92	spi.write(LCDFONTSEL - LCD_WR - LCD_CE);
gertk	3:fc101c00b5be	93	cs=1;
gertk	3:fc101c00b5be	94
gertk	3:fc101c00b5be	95	cs=0;
gertk	3:fc101c00b5be	96	spi.write(0x40);
gertk	3:fc101c00b5be	97	spi.write(GPIOA); // select GPIOA
gertk	3:fc101c00b5be	98	spi.write(LCDFONTSEL);
gertk	3:fc101c00b5be	99	cs=1;
gertk	3:fc101c00b5be	100	}
gertk	3:fc101c00b5be	101
gertk	3:fc101c00b5be	102	void lcd_init()
gertk	3:fc101c00b5be	103	{
gertk	3:fc101c00b5be	104	cs=0;
gertk	3:fc101c00b5be	105	spi.write(0x40);
gertk	3:fc101c00b5be	106	spi.write(IODIRA); // select IODIRA at start
gertk	3:fc101c00b5be	107	spi.write(0x00); // IODIRA all outputs
gertk	3:fc101c00b5be	108	spi.write(0x00); // IODIRB all outputs
gertk	3:fc101c00b5be	109	cs=1;
gertk	3:fc101c00b5be	110	wait(0.1);
gertk	3:fc101c00b5be	111
gertk	3:fc101c00b5be	112	cs=0;
gertk	3:fc101c00b5be	113	spi.write(0x40);
gertk	3:fc101c00b5be	114	spi.write(GPIOA); // select GPIOA at start
gertk	3:fc101c00b5be	115	spi.write(LCDFONTSEL-LCD_RST); // activate reset
gertk	3:fc101c00b5be	116	spi.write(0x00); // all B outputs 0
gertk	3:fc101c00b5be	117	cs=1;
gertk	3:fc101c00b5be	118	wait(0.1);
gertk	3:fc101c00b5be	119
gertk	3:fc101c00b5be	120	cs=0;
gertk	3:fc101c00b5be	121	spi.write(0x40);
gertk	3:fc101c00b5be	122	spi.write(GPIOA); // select GPIOA at start
gertk	3:fc101c00b5be	123	spi.write(LCDFONTSEL); // deactivate reset
gertk	3:fc101c00b5be	124	cs=1;
gertk	3:fc101c00b5be	125	wait(0.1);
gertk	3:fc101c00b5be	126
gertk	3:fc101c00b5be	127	// set text home address at 0x0000
gertk	3:fc101c00b5be	128	lcd_data(TEXT_STARTADDRESS%0x100);
gertk	3:fc101c00b5be	129	lcd_data(TEXT_STARTADDRESS/0x100);
gertk	3:fc101c00b5be	130	lcd_command(TXHOME);
gertk	3:fc101c00b5be	131
gertk	3:fc101c00b5be	132	// set graphic home address at 0x1000
gertk	3:fc101c00b5be	133	lcd_data(GRAPHIC_STARTADDRESS%0x100);
gertk	3:fc101c00b5be	134	lcd_data(GRAPHIC_STARTADDRESS/0x100);
gertk	3:fc101c00b5be	135	lcd_command(GRHOME);
gertk	3:fc101c00b5be	136
gertk	3:fc101c00b5be	137	// set text area
gertk	3:fc101c00b5be	138	lcd_data(LCD_WIDTH);
gertk	3:fc101c00b5be	139	lcd_data(0x00);
gertk	3:fc101c00b5be	140	lcd_command(TXAREA);
gertk	3:fc101c00b5be	141
gertk	3:fc101c00b5be	142	// set graphic area
gertk	3:fc101c00b5be	143	lcd_data(LCD_WIDTH);
gertk	3:fc101c00b5be	144	lcd_data(0x00);
gertk	3:fc101c00b5be	145	lcd_command(GRAREA);
gertk	3:fc101c00b5be	146
gertk	3:fc101c00b5be	147	// mode set (internal character generation mode)
gertk	3:fc101c00b5be	148	lcd_command(0x80);
gertk	3:fc101c00b5be	149
gertk	3:fc101c00b5be	150	// set offset register
gertk	3:fc101c00b5be	151	lcd_data(0x02);
gertk	3:fc101c00b5be	152	lcd_data(0x00);
gertk	3:fc101c00b5be	153	lcd_command(OFFSET);
gertk	3:fc101c00b5be	154
gertk	3:fc101c00b5be	155	// display mode (text on graphics on cursor off)
gertk	3:fc101c00b5be	156	lcd_command(0x90+0x08+0x04);
gertk	3:fc101c00b5be	157
gertk	3:fc101c00b5be	158	}
gertk	3:fc101c00b5be	159
gertk	3:fc101c00b5be	160	// put a text string at position x,y (character row,column)
gertk	3:fc101c00b5be	161	void lcd_string(char x,char y,char *s)
gertk	3:fc101c00b5be	162	{
gertk	3:fc101c00b5be	163	int adr;
gertk	3:fc101c00b5be	164	adr=TEXT_STARTADDRESS+x+y*LCD_WIDTH;
gertk	3:fc101c00b5be	165	lcd_data(adr%0x100);
gertk	3:fc101c00b5be	166	lcd_data(adr/0x100);
gertk	3:fc101c00b5be	167	lcd_command(ADPSET);
gertk	3:fc101c00b5be	168	lcd_command(AWRON);
gertk	3:fc101c00b5be	169
gertk	3:fc101c00b5be	170	while (s[0])
gertk	3:fc101c00b5be	171	{
gertk	3:fc101c00b5be	172	// convert from ascii to t6963
gertk	3:fc101c00b5be	173	lcd_data(s[0]-32);
gertk	3:fc101c00b5be	174	s++;
gertk	3:fc101c00b5be	175	}
gertk	3:fc101c00b5be	176	lcd_command(AWROFF);
gertk	3:fc101c00b5be	177	}
gertk	3:fc101c00b5be	178
gertk	3:fc101c00b5be	179	// clear lcd display memory (8k)
gertk	3:fc101c00b5be	180	void lcd_cls()
gertk	3:fc101c00b5be	181	{
gertk	3:fc101c00b5be	182	int a;
gertk	3:fc101c00b5be	183	lcd_data(0x00);
gertk	3:fc101c00b5be	184	lcd_data(0x00);
gertk	3:fc101c00b5be	185	lcd_command(ADPSET);
gertk	3:fc101c00b5be	186	lcd_command(AWRON);
gertk	3:fc101c00b5be	187	for (a=0; a<8192; a++) lcd_data(0);
gertk	3:fc101c00b5be	188	lcd_command(AWROFF);
gertk	3:fc101c00b5be	189	}
gertk	3:fc101c00b5be	190
gertk	3:fc101c00b5be	191	// set or reset a pixel on the display on position x,y with color 0 or 1
gertk	3:fc101c00b5be	192	void lcd_plot(char x,char y,char color)
gertk	3:fc101c00b5be	193	{
gertk	3:fc101c00b5be	194	int adr;
gertk	3:fc101c00b5be	195	adr = GRAPHIC_STARTADDRESS + ((LCD_WIDTH) * y) + (x/PIXELWIDTH); // calculate offset
gertk	3:fc101c00b5be	196	lcd_data(adr%0x100); // set low byte
gertk	3:fc101c00b5be	197	lcd_data(adr/0x100); // set high byte
gertk	3:fc101c00b5be	198	lcd_command(ADPSET); // set address pointer
gertk	3:fc101c00b5be	199	if (color) lcd_command(BS + ((PIXELWIDTH-1)-(x%PIXELWIDTH))); // use bit set mode
gertk	3:fc101c00b5be	200	else lcd_command(BR + ((PIXELWIDTH-1)-(x%PIXELWIDTH))); // use bit reset mode
gertk	3:fc101c00b5be	201	}
gertk	3:fc101c00b5be	202
gertk	3:fc101c00b5be	203	// Bresenham line routine
gertk	3:fc101c00b5be	204	void lcd_line(int x0, int y0, int x1, int y1,char color)
gertk	3:fc101c00b5be	205	{
gertk	3:fc101c00b5be	206	char steep=1;
gertk	3:fc101c00b5be	207	int i,dx,dy,e;
gertk	3:fc101c00b5be	208	signed char sx,sy;
gertk	3:fc101c00b5be	209
gertk	3:fc101c00b5be	210	dx = abs(x1-x0);
gertk	3:fc101c00b5be	211	sx = ((x1 - x0) >0) ? 1 : -1;
gertk	3:fc101c00b5be	212	dy=abs(y1-y0);
gertk	3:fc101c00b5be	213	sy = ((y1 - y0) >0) ? 1 : -1;
gertk	3:fc101c00b5be	214
gertk	3:fc101c00b5be	215	if (dy > dx)
gertk	3:fc101c00b5be	216	{
gertk	3:fc101c00b5be	217	steep=0;
gertk	3:fc101c00b5be	218	// swap X0 and Y0
gertk	3:fc101c00b5be	219	x0=x0 ^ y0;
gertk	3:fc101c00b5be	220	y0=x0 ^ y0;
gertk	3:fc101c00b5be	221	x0=x0 ^ y0;
gertk	3:fc101c00b5be	222
gertk	3:fc101c00b5be	223	// swap DX and DY
gertk	3:fc101c00b5be	224	dx=dx ^ dy;
gertk	3:fc101c00b5be	225	dy=dx ^ dy;
gertk	3:fc101c00b5be	226	dx=dx ^ dy;
gertk	3:fc101c00b5be	227
gertk	3:fc101c00b5be	228	// swap SX and SY
gertk	3:fc101c00b5be	229	sx=sx ^ sy;
gertk	3:fc101c00b5be	230	sy=sx ^ sy;
gertk	3:fc101c00b5be	231	sx=sx ^ sy;
gertk	3:fc101c00b5be	232	}
gertk	3:fc101c00b5be	233
gertk	3:fc101c00b5be	234	e = (dy << 1) - dx;
gertk	3:fc101c00b5be	235
gertk	3:fc101c00b5be	236	for (i=0; i<=dx; i++)
gertk	3:fc101c00b5be	237	{
gertk	3:fc101c00b5be	238	if (steep)
gertk	3:fc101c00b5be	239	{
gertk	3:fc101c00b5be	240	lcd_plot(x0,y0,color);
gertk	3:fc101c00b5be	241	}
gertk	3:fc101c00b5be	242	else
gertk	3:fc101c00b5be	243	{
gertk	3:fc101c00b5be	244	lcd_plot(y0,x0,color);
gertk	3:fc101c00b5be	245	}
gertk	3:fc101c00b5be	246	while (e >= 0)
gertk	3:fc101c00b5be	247	{
gertk	3:fc101c00b5be	248	y0 += sy;
gertk	3:fc101c00b5be	249	e -= (dx << 1);
gertk	3:fc101c00b5be	250	}
gertk	3:fc101c00b5be	251	x0 += sx;
gertk	3:fc101c00b5be	252	e += (dy << 1);
gertk	3:fc101c00b5be	253	}
gertk	3:fc101c00b5be	254	}
gertk	3:fc101c00b5be	255
gertk	3:fc101c00b5be	256	// Bresenham circle routine
gertk	3:fc101c00b5be	257	void lcd_circle(int x0,int y0, int radius, char color)
gertk	3:fc101c00b5be	258	{
gertk	3:fc101c00b5be	259
gertk	3:fc101c00b5be	260	int f = 1 - radius;
gertk	3:fc101c00b5be	261	int dx = 1;
gertk	3:fc101c00b5be	262	int dy = -2 * radius;
gertk	3:fc101c00b5be	263	int x = 0;
gertk	3:fc101c00b5be	264	int y = radius;
gertk	3:fc101c00b5be	265
gertk	3:fc101c00b5be	266	lcd_plot(x0, y0 + radius,color);
gertk	3:fc101c00b5be	267	lcd_plot(x0, y0 - radius,color);
gertk	3:fc101c00b5be	268	lcd_plot(x0 + radius, y0,color);
gertk	3:fc101c00b5be	269	lcd_plot(x0 - radius, y0,color);
gertk	3:fc101c00b5be	270
gertk	3:fc101c00b5be	271	while(x < y)
gertk	3:fc101c00b5be	272	{
gertk	3:fc101c00b5be	273	if(f >= 0)
gertk	3:fc101c00b5be	274	{
gertk	3:fc101c00b5be	275	y--;
gertk	3:fc101c00b5be	276	dy += 2;
gertk	3:fc101c00b5be	277	f += dy;
gertk	3:fc101c00b5be	278	}
gertk	3:fc101c00b5be	279	x++;
gertk	3:fc101c00b5be	280	dx += 2;
gertk	3:fc101c00b5be	281	f += dx;
gertk	3:fc101c00b5be	282	lcd_plot(x0 + x, y0 + y,color);
gertk	3:fc101c00b5be	283	lcd_plot(x0 - x, y0 + y,color);
gertk	3:fc101c00b5be	284	lcd_plot(x0 + x, y0 - y,color);
gertk	3:fc101c00b5be	285	lcd_plot(x0 - x, y0 - y,color);
gertk	3:fc101c00b5be	286	lcd_plot(x0 + y, y0 + x,color);
gertk	3:fc101c00b5be	287	lcd_plot(x0 - y, y0 + x,color);
gertk	3:fc101c00b5be	288	lcd_plot(x0 + y, y0 - x,color);
gertk	3:fc101c00b5be	289	lcd_plot(x0 - y, y0 - x,color);
gertk	3:fc101c00b5be	290	}
gertk	3:fc101c00b5be	291	}
gertk	3:fc101c00b5be	292
gertk	3:fc101c00b5be	293	int main() {
gertk	3:fc101c00b5be	294
gertk	3:fc101c00b5be	295
gertk	3:fc101c00b5be	296	float a,b,f;
gertk	3:fc101c00b5be	297	float pi=3.14159265;
gertk	3:fc101c00b5be	298	float h_pi=pi/6;
gertk	3:fc101c00b5be	299	float m_pi=pi/30;
gertk	3:fc101c00b5be	300
gertk	3:fc101c00b5be	301	char buf[40];
gertk	3:fc101c00b5be	302	time_t seconds;
gertk	3:fc101c00b5be	303	int sec,min,hour;
gertk	3:fc101c00b5be	304	int s_sx,s_sy,s_ex,s_ey;
gertk	3:fc101c00b5be	305	int m_sx,m_sy,m_ex,m_ey;
gertk	3:fc101c00b5be	306	int h_sx,h_sy,h_ex,h_ey;
gertk	3:fc101c00b5be	307
gertk	3:fc101c00b5be	308	// setup time structure
gertk	3:fc101c00b5be	309	struct tm t;
gertk	3:fc101c00b5be	310	t.tm_sec = 00; // 0-59
gertk	3:fc101c00b5be	311	t.tm_min = 30; // 0-59
gertk	3:fc101c00b5be	312	t.tm_hour = 21; // 0-23
gertk	3:fc101c00b5be	313	t.tm_mday = 14; // 1-31
gertk	3:fc101c00b5be	314	t.tm_mon = 11; // 0-11
gertk	3:fc101c00b5be	315	t.tm_year = 110; // year since 1900
gertk	3:fc101c00b5be	316	seconds = mktime(&t);
gertk	3:fc101c00b5be	317	// set_time(seconds);
gertk	3:fc101c00b5be	318
gertk	3:fc101c00b5be	319
gertk	3:fc101c00b5be	320	pc.printf("SPI test\n");
gertk	3:fc101c00b5be	321
gertk	3:fc101c00b5be	322	// set SPI to full speed (10 MHz mode)
gertk	3:fc101c00b5be	323	spi.format(8,0);
gertk	3:fc101c00b5be	324	spi.frequency(10000000);
gertk	3:fc101c00b5be	325	// spi.frequency(10000);
gertk	3:fc101c00b5be	326	wait(0.1);
gertk	3:fc101c00b5be	327
gertk	3:fc101c00b5be	328	pc.printf("MCP init\n");
gertk	3:fc101c00b5be	329	lcd_init();
gertk	3:fc101c00b5be	330	lcd_cls();
gertk	3:fc101c00b5be	331
gertk	3:fc101c00b5be	332	// write some text 345678901234567890
gertk	3:fc101c00b5be	333	lcd_string(0,0,"* Hello mbed World! *");
gertk	3:fc101c00b5be	334	// lcd_string(0,15,"abcdefghijklmnopqrstuvwxyz");
gertk	3:fc101c00b5be	335
gertk	3:fc101c00b5be	336
gertk	3:fc101c00b5be	337	// draw outer circle of analog clock
gertk	3:fc101c00b5be	338	lcd_circle(CENTERX,CENTERY,OUTER_RADIUS+1,1);
gertk	3:fc101c00b5be	339
gertk	3:fc101c00b5be	340	// draw hour markings
gertk	3:fc101c00b5be	341	for (min=0; min<59; min+=5)
gertk	3:fc101c00b5be	342	{
gertk	3:fc101c00b5be	343	b=min*m_pi;
gertk	3:fc101c00b5be	344	m_sx=sin(b)*INNER_RADIUS+CENTERX;
gertk	3:fc101c00b5be	345	m_sy=-cos(b)*INNER_RADIUS+CENTERY;
gertk	3:fc101c00b5be	346	m_ex=sin(b)*OUTER_RADIUS+CENTERX;
gertk	3:fc101c00b5be	347	m_ey=-cos(b)*OUTER_RADIUS+CENTERY;
gertk	3:fc101c00b5be	348	lcd_line(m_sx,m_sy,m_ex,m_ey,1);
gertk	3:fc101c00b5be	349	}
gertk	3:fc101c00b5be	350
gertk	3:fc101c00b5be	351
gertk	3:fc101c00b5be	352	for(;;)
gertk	3:fc101c00b5be	353	{
gertk	3:fc101c00b5be	354	seconds = time(NULL);
gertk	3:fc101c00b5be	355
gertk	3:fc101c00b5be	356	// 13:24:00 dd/mm/yyyy
gertk	3:fc101c00b5be	357	strftime(buf,40, "%H:%M:%S %d/%m/%Y", localtime(&seconds));
gertk	3:fc101c00b5be	358	lcd_string(0,15,buf);
gertk	3:fc101c00b5be	359
gertk	3:fc101c00b5be	360	strftime(buf,40, "%I %M %S", localtime(&seconds));
gertk	3:fc101c00b5be	361	sscanf(buf,"%d %d %d",&hour,&min,&sec);
gertk	3:fc101c00b5be	362
gertk	3:fc101c00b5be	363	b=sec*m_pi;
gertk	3:fc101c00b5be	364	s_sx=CENTERX;
gertk	3:fc101c00b5be	365	s_sy=CENTERY;
gertk	3:fc101c00b5be	366	s_ex=sin(b)*(INNER_RADIUS-3)+CENTERX;
gertk	3:fc101c00b5be	367	s_ey=-cos(b)*(INNER_RADIUS-3)+CENTERY;
gertk	3:fc101c00b5be	368
gertk	3:fc101c00b5be	369
gertk	3:fc101c00b5be	370	b=min*m_pi;
gertk	3:fc101c00b5be	371	m_sx=sin(b)*(CENTER_CIRCLE)+CENTERX;
gertk	3:fc101c00b5be	372	m_sy=-cos(b)*(CENTER_CIRCLE)+CENTERY;
gertk	3:fc101c00b5be	373	m_ex=sin(b)*(INNER_RADIUS-10)+CENTERX;
gertk	3:fc101c00b5be	374	m_ey=-cos(b)*(INNER_RADIUS-10)+CENTERY;
gertk	3:fc101c00b5be	375
gertk	3:fc101c00b5be	376	// advancing hour hand
gertk	3:fc101c00b5be	377	if (hour<12)
gertk	3:fc101c00b5be	378	{
gertk	3:fc101c00b5be	379	// draw hour hand with an offset
gertk	3:fc101c00b5be	380	// calculated by dividing minutes by 12
gertk	3:fc101c00b5be	381	b=(hour5+min/12)m_pi;
gertk	3:fc101c00b5be	382	}
gertk	3:fc101c00b5be	383	else
gertk	3:fc101c00b5be	384	{
gertk	3:fc101c00b5be	385	// hour would be 0 offset at 12 o'clock
gertk	3:fc101c00b5be	386	// so we can leave it out of the equation...
gertk	3:fc101c00b5be	387	b=(min/12)*m_pi;
gertk	3:fc101c00b5be	388	}
gertk	3:fc101c00b5be	389	h_sx=sin(b)*(CENTER_CIRCLE)+CENTERX;
gertk	3:fc101c00b5be	390	h_sy=-cos(b)*(CENTER_CIRCLE)+CENTERY;
gertk	3:fc101c00b5be	391	h_ex=sin(b)*(INNER_RADIUS-20)+CENTERX;
gertk	3:fc101c00b5be	392	h_ey=-cos(b)*(INNER_RADIUS-20)+CENTERY;
gertk	3:fc101c00b5be	393
gertk	3:fc101c00b5be	394	// draw 'new' hands
gertk	3:fc101c00b5be	395	lcd_line(s_sx,s_sy,s_ex,s_ey,1);
gertk	3:fc101c00b5be	396	lcd_line(m_sx,m_sy,m_ex,m_ey,1);
gertk	3:fc101c00b5be	397	lcd_line(h_sx,h_sy,h_ex,h_ey,1);
gertk	3:fc101c00b5be	398
gertk	3:fc101c00b5be	399	lcd_circle(CENTERX,CENTERY,CENTER_CIRCLE,1);
gertk	3:fc101c00b5be	400	lcd_circle(CENTERX,CENTERY,1,1);
gertk	3:fc101c00b5be	401
gertk	3:fc101c00b5be	402	myled = !myled;
gertk	3:fc101c00b5be	403
gertk	3:fc101c00b5be	404	// now wait until the seconds change
gertk	3:fc101c00b5be	405	while (seconds==time(NULL)) wait(0.1);
gertk	3:fc101c00b5be	406
gertk	3:fc101c00b5be	407	// erase 'old' hands
gertk	3:fc101c00b5be	408	lcd_line(s_sx,s_sy,s_ex,s_ey,0);
gertk	3:fc101c00b5be	409	lcd_line(m_sx,m_sy,m_ex,m_ey,0);
gertk	3:fc101c00b5be	410	lcd_line(h_sx,h_sy,h_ex,h_ey,0);
gertk	3:fc101c00b5be	411
gertk	3:fc101c00b5be	412	}
gertk	3:fc101c00b5be	413	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	05 Dec 2010
Imports:	116
Forks:	0
Commits:	5
Dependents:	0
Dependencies:	1
Followers:	4

main.cpp@4:fd7c6559a56d, 2011-10-17 (annotated)

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