OV7670_edm_full - ov7670 FIFO data taking program

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angelo mottolese / Mbed 2 deprecated OV7670_edm_full

ov7670 FIFO data taking program

Dependencies: OV7670 with FIFO ST7735_TFT mbed

Fork of OV7670_Testing by Martin Smith

ov7670.h@0:aabbf2286bf2, 2012-03-27 (annotated)

Committer:: ms523
Date:: Tue Mar 27 19:10:18 2012 +0000
Revision:: 0:aabbf2286bf2
Child:: 1:c98598814170

Who changed what in which revision?

User	Revision	Line number	New contents of line
ms523	0:aabbf2286bf2	1	#include "mbed.h"
ms523	0:aabbf2286bf2	2	#include "ov7670reg.h"
ms523	0:aabbf2286bf2	3
ms523	0:aabbf2286bf2	4	#define OV7670_WRITE (0x42)
ms523	0:aabbf2286bf2	5	#define OV7670_READ (0x43)
ms523	0:aabbf2286bf2	6	#define OV7670_WRITEWAIT (20)
ms523	0:aabbf2286bf2	7	#define OV7670_NOACK (0)
ms523	0:aabbf2286bf2	8	#define OV7670_REGMAX (201)
ms523	0:aabbf2286bf2	9	#define OV7670_I2CFREQ (50000)
ms523	0:aabbf2286bf2	10
ms523	0:aabbf2286bf2	11	//
ms523	0:aabbf2286bf2	12	// OV7670 + FIFO AL422B camera board test
ms523	0:aabbf2286bf2	13	//
ms523	0:aabbf2286bf2	14	class OV7670 : public Base
ms523	0:aabbf2286bf2	15	{
ms523	0:aabbf2286bf2	16	public:
ms523	0:aabbf2286bf2	17	I2C camera ;
ms523	0:aabbf2286bf2	18	InterruptIn vsync,href;
ms523	0:aabbf2286bf2	19	DigitalOut wen ;
ms523	0:aabbf2286bf2	20	BusIn data ;
ms523	0:aabbf2286bf2	21	DigitalOut rrst,oe,rclk ;
ms523	0:aabbf2286bf2	22	volatile int LineCounter ;
ms523	0:aabbf2286bf2	23	volatile int LastLines ;
ms523	0:aabbf2286bf2	24	volatile bool CaptureReq ;
ms523	0:aabbf2286bf2	25	volatile bool Busy ;
ms523	0:aabbf2286bf2	26	volatile bool Done ;
ms523	0:aabbf2286bf2	27
ms523	0:aabbf2286bf2	28	OV7670(
ms523	0:aabbf2286bf2	29	PinName sda,// Camera I2C port
ms523	0:aabbf2286bf2	30	PinName scl,// Camera I2C port
ms523	0:aabbf2286bf2	31	PinName vs, // VSYNC
ms523	0:aabbf2286bf2	32	PinName hr, // HREF
ms523	0:aabbf2286bf2	33	PinName we, // WEN
ms523	0:aabbf2286bf2	34	PinName d7, // D7
ms523	0:aabbf2286bf2	35	PinName d6, // D6
ms523	0:aabbf2286bf2	36	PinName d5, // D5
ms523	0:aabbf2286bf2	37	PinName d4, // D4
ms523	0:aabbf2286bf2	38	PinName d3, // D3
ms523	0:aabbf2286bf2	39	PinName d2, // D2
ms523	0:aabbf2286bf2	40	PinName d1, // D1
ms523	0:aabbf2286bf2	41	PinName d0, // D0
ms523	0:aabbf2286bf2	42	PinName rt, // /RRST
ms523	0:aabbf2286bf2	43	PinName o, // /OE
ms523	0:aabbf2286bf2	44	PinName rc // RCLK
ms523	0:aabbf2286bf2	45	) : camera(sda,scl),vsync(vs),href(hr),wen(we),data(d0,d1,d2,d3,d4,d5,d6,d7),rrst(rt),oe(o),rclk(rc)
ms523	0:aabbf2286bf2	46	{
ms523	0:aabbf2286bf2	47	camera.stop() ;
ms523	0:aabbf2286bf2	48	camera.frequency(OV7670_I2CFREQ) ;
ms523	0:aabbf2286bf2	49	vsync.fall(this,&OV7670::VsyncHandler) ;
ms523	0:aabbf2286bf2	50	href.rise(this,&OV7670::HrefHandler) ;
ms523	0:aabbf2286bf2	51	CaptureReq = false ;
ms523	0:aabbf2286bf2	52	Busy = false ;
ms523	0:aabbf2286bf2	53	Done = false ;
ms523	0:aabbf2286bf2	54	LineCounter = 0 ;
ms523	0:aabbf2286bf2	55	rrst = 1 ;
ms523	0:aabbf2286bf2	56	oe = 1 ;
ms523	0:aabbf2286bf2	57	rclk = 1 ;
ms523	0:aabbf2286bf2	58	wen = 0 ;
ms523	0:aabbf2286bf2	59	}
ms523	0:aabbf2286bf2	60
ms523	0:aabbf2286bf2	61	// capture request
ms523	0:aabbf2286bf2	62	void CaptureNext(void)
ms523	0:aabbf2286bf2	63	{
ms523	0:aabbf2286bf2	64	CaptureReq = true ;
ms523	0:aabbf2286bf2	65	Busy = true ;
ms523	0:aabbf2286bf2	66	}
ms523	0:aabbf2286bf2	67
ms523	0:aabbf2286bf2	68	// capture done? (with clear)
ms523	0:aabbf2286bf2	69	bool CaptureDone(void)
ms523	0:aabbf2286bf2	70	{
ms523	0:aabbf2286bf2	71	bool result ;
ms523	0:aabbf2286bf2	72	if (Busy) {
ms523	0:aabbf2286bf2	73	result = false ;
ms523	0:aabbf2286bf2	74	} else {
ms523	0:aabbf2286bf2	75	result = Done ;
ms523	0:aabbf2286bf2	76	Done = false ;
ms523	0:aabbf2286bf2	77	}
ms523	0:aabbf2286bf2	78	return result ;
ms523	0:aabbf2286bf2	79	}
ms523	0:aabbf2286bf2	80
ms523	0:aabbf2286bf2	81	// write to camera
ms523	0:aabbf2286bf2	82	void WriteReg(int addr,int data)
ms523	0:aabbf2286bf2	83	{
ms523	0:aabbf2286bf2	84	// WRITE 0x42,ADDR,DATA
ms523	0:aabbf2286bf2	85	camera.start() ;
ms523	0:aabbf2286bf2	86	camera.write(OV7670_WRITE) ;
ms523	0:aabbf2286bf2	87	wait_us(OV7670_WRITEWAIT);
ms523	0:aabbf2286bf2	88	camera.write(addr) ;
ms523	0:aabbf2286bf2	89	wait_us(OV7670_WRITEWAIT);
ms523	0:aabbf2286bf2	90	camera.write(data) ;
ms523	0:aabbf2286bf2	91	camera.stop() ;
ms523	0:aabbf2286bf2	92	}
ms523	0:aabbf2286bf2	93
ms523	0:aabbf2286bf2	94	// read from camera
ms523	0:aabbf2286bf2	95	int ReadReg(int addr)
ms523	0:aabbf2286bf2	96	{
ms523	0:aabbf2286bf2	97	int data ;
ms523	0:aabbf2286bf2	98
ms523	0:aabbf2286bf2	99	// WRITE 0x42,ADDR
ms523	0:aabbf2286bf2	100	camera.start() ;
ms523	0:aabbf2286bf2	101	camera.write(OV7670_WRITE) ;
ms523	0:aabbf2286bf2	102	wait_us(OV7670_WRITEWAIT);
ms523	0:aabbf2286bf2	103	camera.write(addr) ;
ms523	0:aabbf2286bf2	104	camera.stop() ;
ms523	0:aabbf2286bf2	105	wait_us(OV7670_WRITEWAIT);
ms523	0:aabbf2286bf2	106
ms523	0:aabbf2286bf2	107	// WRITE 0x43,READ
ms523	0:aabbf2286bf2	108	camera.start() ;
ms523	0:aabbf2286bf2	109	camera.write(OV7670_READ) ;
ms523	0:aabbf2286bf2	110	wait_us(OV7670_WRITEWAIT);
ms523	0:aabbf2286bf2	111	data = camera.read(OV7670_NOACK) ;
ms523	0:aabbf2286bf2	112	camera.stop() ;
ms523	0:aabbf2286bf2	113
ms523	0:aabbf2286bf2	114	return data ;
ms523	0:aabbf2286bf2	115	}
ms523	0:aabbf2286bf2	116
ms523	0:aabbf2286bf2	117	void Reset(void) {
ms523	0:aabbf2286bf2	118	WriteReg(0x12,0x80) ; // RESET CAMERA
ms523	0:aabbf2286bf2	119	wait_ms(200) ;
ms523	0:aabbf2286bf2	120	}
ms523	0:aabbf2286bf2	121
ms523	0:aabbf2286bf2	122	void InitQQVGA() {
ms523	0:aabbf2286bf2	123	// QQVGA RGB444
ms523	0:aabbf2286bf2	124	WriteReg(REG_CLKRC,0x80);
ms523	0:aabbf2286bf2	125	WriteReg(REG_COM11,0x0A) ;
ms523	0:aabbf2286bf2	126	WriteReg(REG_TSLB,0x04);
ms523	0:aabbf2286bf2	127	WriteReg(REG_COM7,0x04) ;
ms523	0:aabbf2286bf2	128	WriteReg(REG_RGB444, 0x02);
ms523	0:aabbf2286bf2	129	WriteReg(REG_COM15, 0xd0);
ms523	0:aabbf2286bf2	130	WriteReg(REG_HSTART,0x16) ;
ms523	0:aabbf2286bf2	131	WriteReg(REG_HSTOP,0x04) ;
ms523	0:aabbf2286bf2	132	WriteReg(REG_HREF,0x24) ;
ms523	0:aabbf2286bf2	133	WriteReg(REG_VSTART,0x02) ;
ms523	0:aabbf2286bf2	134	WriteReg(REG_VSTOP,0x7a) ;
ms523	0:aabbf2286bf2	135	WriteReg(REG_VREF,0x0a) ;
ms523	0:aabbf2286bf2	136	WriteReg(REG_COM10,0x02) ;
ms523	0:aabbf2286bf2	137	WriteReg(REG_COM3, 0x04);
ms523	0:aabbf2286bf2	138	WriteReg(REG_COM14, 0x1a);
ms523	0:aabbf2286bf2	139	WriteReg(0x72, 0x22);
ms523	0:aabbf2286bf2	140	WriteReg(0x73, 0xf2);
ms523	0:aabbf2286bf2	141
ms523	0:aabbf2286bf2	142	// COLOR SETTING
ms523	0:aabbf2286bf2	143	WriteReg(0x4f,0x80);
ms523	0:aabbf2286bf2	144	WriteReg(0x50,0x80);
ms523	0:aabbf2286bf2	145	WriteReg(0x51,0x00);
ms523	0:aabbf2286bf2	146	WriteReg(0x52,0x22);
ms523	0:aabbf2286bf2	147	WriteReg(0x53,0x5e);
ms523	0:aabbf2286bf2	148	WriteReg(0x54,0x80);
ms523	0:aabbf2286bf2	149	WriteReg(0x56,0x40);
ms523	0:aabbf2286bf2	150	WriteReg(0x58,0x9e);
ms523	0:aabbf2286bf2	151	WriteReg(0x59,0x88);
ms523	0:aabbf2286bf2	152	WriteReg(0x5a,0x88);
ms523	0:aabbf2286bf2	153	WriteReg(0x5b,0x44);
ms523	0:aabbf2286bf2	154	WriteReg(0x5c,0x67);
ms523	0:aabbf2286bf2	155	WriteReg(0x5d,0x49);
ms523	0:aabbf2286bf2	156	WriteReg(0x5e,0x0e);
ms523	0:aabbf2286bf2	157	WriteReg(0x69,0x00);
ms523	0:aabbf2286bf2	158	WriteReg(0x6a,0x40);
ms523	0:aabbf2286bf2	159	WriteReg(0x6b,0x0a);
ms523	0:aabbf2286bf2	160	WriteReg(0x6c,0x0a);
ms523	0:aabbf2286bf2	161	WriteReg(0x6d,0x55);
ms523	0:aabbf2286bf2	162	WriteReg(0x6e,0x11);
ms523	0:aabbf2286bf2	163	WriteReg(0x6f,0x9f);
ms523	0:aabbf2286bf2	164
ms523	0:aabbf2286bf2	165	WriteReg(0xb0,0x84);
ms523	0:aabbf2286bf2	166	}
ms523	0:aabbf2286bf2	167
ms523	0:aabbf2286bf2	168
ms523	0:aabbf2286bf2	169
ms523	0:aabbf2286bf2	170	// vsync handler
ms523	0:aabbf2286bf2	171	void VsyncHandler(void)
ms523	0:aabbf2286bf2	172	{
ms523	0:aabbf2286bf2	173	// Capture Enable
ms523	0:aabbf2286bf2	174	if (CaptureReq) {
ms523	0:aabbf2286bf2	175	wen = 1 ;
ms523	0:aabbf2286bf2	176	Done = false ;
ms523	0:aabbf2286bf2	177	CaptureReq = false ;
ms523	0:aabbf2286bf2	178	} else {
ms523	0:aabbf2286bf2	179	wen = 0 ;
ms523	0:aabbf2286bf2	180	if (Busy) {
ms523	0:aabbf2286bf2	181	Busy = false ;
ms523	0:aabbf2286bf2	182	Done = true ;
ms523	0:aabbf2286bf2	183	}
ms523	0:aabbf2286bf2	184	}
ms523	0:aabbf2286bf2	185
ms523	0:aabbf2286bf2	186	// Hline Counter
ms523	0:aabbf2286bf2	187	LastLines = LineCounter ;
ms523	0:aabbf2286bf2	188	LineCounter = 0 ;
ms523	0:aabbf2286bf2	189	}
ms523	0:aabbf2286bf2	190
ms523	0:aabbf2286bf2	191	// href handler
ms523	0:aabbf2286bf2	192	void HrefHandler(void)
ms523	0:aabbf2286bf2	193	{
ms523	0:aabbf2286bf2	194	LineCounter++ ;
ms523	0:aabbf2286bf2	195	}
ms523	0:aabbf2286bf2	196
ms523	0:aabbf2286bf2	197	// Data Read
ms523	0:aabbf2286bf2	198	int ReadOneByte(void)
ms523	0:aabbf2286bf2	199	{
ms523	0:aabbf2286bf2	200	int result ;
ms523	0:aabbf2286bf2	201	rclk = 1 ;
ms523	0:aabbf2286bf2	202	// wait_us(1) ;
ms523	0:aabbf2286bf2	203	result = data ;
ms523	0:aabbf2286bf2	204	rclk = 0 ;
ms523	0:aabbf2286bf2	205	return result ;
ms523	0:aabbf2286bf2	206	}
ms523	0:aabbf2286bf2	207
ms523	0:aabbf2286bf2	208	// Data Start
ms523	0:aabbf2286bf2	209	void ReadStart(void)
ms523	0:aabbf2286bf2	210	{
ms523	0:aabbf2286bf2	211	rrst = 0 ;
ms523	0:aabbf2286bf2	212	oe = 0 ;
ms523	0:aabbf2286bf2	213	wait_us(1) ;
ms523	0:aabbf2286bf2	214	rclk = 0 ;
ms523	0:aabbf2286bf2	215	wait_us(1) ;
ms523	0:aabbf2286bf2	216	rclk = 1 ;
ms523	0:aabbf2286bf2	217	wait_us(1) ;
ms523	0:aabbf2286bf2	218	rrst = 1 ;
ms523	0:aabbf2286bf2	219	}
ms523	0:aabbf2286bf2	220
ms523	0:aabbf2286bf2	221	// Data Stop
ms523	0:aabbf2286bf2	222	void ReadStop(void)
ms523	0:aabbf2286bf2	223	{
ms523	0:aabbf2286bf2	224	oe = 1 ;
ms523	0:aabbf2286bf2	225	ReadOneByte() ;
ms523	0:aabbf2286bf2	226	rclk = 1 ;
ms523	0:aabbf2286bf2	227	}
ms523	0:aabbf2286bf2	228	};

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	16 Nov 2016
Imports:	0
Forks:	1
Commits:	3
Dependents:	0
Dependencies:	3
Followers:	1

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ov7670.h@0:aabbf2286bf2, 2012-03-27 (annotated)

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