/****************************************************************************
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* Copyright: (C)2014 Î人ÁèÔÆǶÈëʽʵÑéÊÒ www.emblinux.com
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* Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
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* Description: ·Ü¶·STM32v5¿ª·¢°åOV7670µÄ¼Ä´æÆ÷±í£¬Ö¡Í¬²½ÖжÏÅäÖã¬
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* ÒÔ¼°ÉãÏñÍ·OV7670+FIFOµÄÒý½Å³õʼ»¯£º
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*
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* ChangeLog:
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* °æ±¾ºÅ ÈÕÆÚ ×÷Õß ËµÃ÷
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* V1.0.0 2014.08.25 GuoWenxue ·¢²¼¸Ã°æ±¾
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****************************************************************************/
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/* CF7670C-V3ÉãÏñÍ·Ä£¿éPin¹Ü½ÅºÍSTM32v5 Á¬½Ó±í:
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*| ²Î¿¼<CF7670C-V3 ¼òҪ˵Ã÷.pdf>ºÍ<·Ü¶·STM32¿ª·¢°åV5ÔÀíͼ.pdf>
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*+---------------------------------------+------------------------------+
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*| CF7670C-V3ÉãÏñÍ·Ä£¿éÒý½Å¼°ËµÃ÷ | STM32¶ËÒý½ÅÁ¬½Ó¼°ËµÃ÷ |
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*+---------------------------------------+------------------------------+
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*| Pin1-VCC(3.3V,·½º¸Å̱ê¼ÇµÄΪµÚÒ»½Å) | 3.3V |
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*| Pin2-GND | GND |
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*| Pin3-SCL(SCCB_SCL²»´øÉÏÀµç×è) | PE2 |
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*| Pin4-SDA(SCCB_SDA ´ø4.7KÉÏÀµç×è) | PE3 |
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*| Pin5-VSYNC(OV7670 ֡ͬ²½ÐźÅ) | PE4 |
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*| Pin6-HREF(OV7670 ÐÐͬ²½ÐźÅ) | NC |
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*| Pin7-WEN(FIFO(AL422)дÔÊÐí,¸ßµçƽÓÐЧ | PE5 |
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*| Pin8-XCLK(NC/RE# ¿Õ½Å) | NC |
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*| Pin9-RRST(FIFO¶ÁµØÖ·¸´Î» | PE6 |
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*| Pin10-OE#(FIFOÊý¾ÝÊä³öʹÄÜ,µÍµçƽÓÐЧ | GND |
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*| Pin11-RCK#(FIFO¶ÁÊý¾ÝʱÖÓ | PD12 |
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*| Pin12-GND | GND |
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*| | |
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*| Pin13-D0 FIFOÊý¾Ý¿ÚÊä³öBIT0 | PC0 |
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*| Pin14-D1 FIFOÊý¾Ý¿ÚÊä³öBIT1 | PC1 |
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*| Pin15-D2 FIFOÊý¾Ý¿ÚÊä³öBIT2 | PC2 |
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*| Pin16-D3 FIFOÊý¾Ý¿ÚÊä³öBIT3 | PC3 |
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*| Pin17-D4 FIFOÊý¾Ý¿ÚÊä³öBIT4 | PC4 |
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*| Pin18-D5 FIFOÊý¾Ý¿ÚÊä³öBIT5 | PC5 |
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*| Pin19-D6 FIFOÊý¾Ý¿ÚÊä³öBIT6 | PC6 |
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*| Pin20-D7 FIFOÊý¾Ý¿ÚÊä³öBIT7 | PC7 |
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*+------------------+-----------------+---------------------------------+
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*/
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#include "stm32f10x.h"
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#include "stm32f10x_exti.h"
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#include "misc.h"
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#include "ov7670_reg.h"
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#include "stm32v5_ov7670.h"
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#include "stm32v5_sccb.h"
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#include "stm32v5_systick.h"
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#include "lcd_r61509v.h"
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/* g_OV7670_VSYNCÓÃÀ´±êʾһ֡µÄ¿ªÊ¼ºÍ½áÊø:
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* OV7670µÄÊý¾ÝÒÔVGAʱÐòÊä³ö,ÔÚ¸ÃʱÐòÖÐVSYNCµÄϽµÑرíʾһ֡µÄÊý¾Ý¿ªÊ¼,¶øÉÏÉýÑرíʾһ֡µÄÊý¾Ý½áÊø.
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* ËùÒÔÎÒÃǽ«VSYNC¹Ü½ÅPE4ÅäÖóÉEXTI4ÉÏÉýÑØ´¥·¢Ä£Ê½.ÔÚEXTI4µÄÖжϴ¦Àí³ÌÐòEXTI4_IRQHandler()ÖÐ,µÚÒ»´Î
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* ½øÈëÖжϵÄʱºò,˵Ã÷ÉÏÒ»Ö¡Êý¾ÝÒѾ½áÊø(ÕâÒ²Òâζ×ÅÕâÒ»Ö¡Êý¾ÝµÄ¿ªÊ¼),ÎÒÃÇ¿ªÊ¼Ê¹ÄÜÉãÏñÍ·Êý¾ÝдÈëFIFO
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* ²¢¸üÐÂg_OV7670_VSYNCµÄ״ֵ̬Ϊ1;µ±µÚ¶þ´Î½øÈëÖжϵÄʱºò,˵Ã÷ÕâÒ»Ö¡Êý¾ÝµÄ´«ÊäÒѾ½áÊø,ÎÒÃǾͽûÖ¹
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* ÉãÏñÍ·Êý¾ÝдÈëFIFO²¢¸üÐÂg_OV7670_VSYNCµÄ״ֵ̬Ϊ2;
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* ÔÚÓ¦ÓóÌÐòÖÐ,ÒªÅжÏg_OV7670_VSYNCµÄÖµÊÇ·ñΪ2,Èç¹ûΪ2Ôò¿ÉÒÔ´ÓFIFOÖжÁÈ¡Êý¾Ý,¶ÁÍêºó¸üÐÂÆä״ֵ̬Ϊ0.
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*/
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uint8_t g_OV7670_VSYNC = 0;
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static cam_fifo_pin_t cam_fifo_pins[CAM_FIFO_PIN_MAX] =
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{
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{CAM_FIFO_PIN_RRST, GPIOE, GPIO_Pin_6}, /* OV7670 FIFO¶ÁµØÖ·¸´Î», PE6*/
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{CAM_FIFO_PIN_RCLK, GPIOD, GPIO_Pin_12}, /* OV7670 FIFO¶ÁʱÖÓ, PD12 */
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{CAM_FIFO_PIN_WE, GPIOE, GPIO_Pin_5}, /* OV7670 FIFOдÔÊÐí, PE5 */
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};
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void set_ov7670_fifo_pin(int which, int level)
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{
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if(which<0 || which> CAM_FIFO_PIN_MAX )
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return;
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if(LEVEL_LOW == level)
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GPIO_ResetBits(cam_fifo_pins[which].group, cam_fifo_pins[which].pin);
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else
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GPIO_SetBits(cam_fifo_pins[which].group, cam_fifo_pins[which].pin);
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}
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void ov7670_fifo_read_prepare(void)
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{
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set_ov7670_fifo_pin(CAM_FIFO_PIN_RRST, LEVEL_LOW);
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set_ov7670_fifo_pin(CAM_FIFO_PIN_RCLK, LEVEL_LOW);
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set_ov7670_fifo_pin(CAM_FIFO_PIN_RCLK, LEVEL_HIGH);
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set_ov7670_fifo_pin(CAM_FIFO_PIN_RRST, LEVEL_HIGH);
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set_ov7670_fifo_pin(CAM_FIFO_PIN_RCLK, LEVEL_LOW);
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set_ov7670_fifo_pin(CAM_FIFO_PIN_RCLK, LEVEL_HIGH);
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}
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/*³õʼ»¯ÉãÏñÍ·Ä£¿éʹÓõÄFIFO(AL422)Ïà¹ØÒý½Å */
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void init_ov7670_fifo_pin(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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/* FIFO_RCLK : PD12 */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOD, &GPIO_InitStructure);
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/* FIFO_VSYNC : PE4 */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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/* FIFO_WEN:PE5 FIFO_RRST:PE6 */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 ;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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/* FIFO D[0-7] */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3
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| GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOC, &GPIO_InitStructure);
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/* PE0-VS-XRST, must set to GPIO output mode here */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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}
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/* ½«VSYNCÁ¬½ÓµÄPE4¹Ü½Å³õʼ»¯ÎªÍⲿÖжÏEXTI4ģʽ£¬²¢ÉèÖÃΪϽµÑØ´¥·¢:
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* STM32ÉÏËùÓеÄGPIO¶¼ÒýÈëµ½EXTIÍⲿÖжÏÏßÉÏ£¬Ê¹µÃËùÓеÄGPIO¶¼ÄÜ×÷ΪÍⲿÖжϵÄ
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* ÊäÈëÔ´.ÆäÖÐPA0~PG0Á¬µ½EXTI0ÉÏ... PA4~PG4Á¬µ½EXT4ÉÏ...PA15~PG15Á¬µ½EXTI15ÉÏ
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* ͨһʱ¿ÌEXTIxÖ»ÄÜÏìÓ¦Ò»¸ö¶Ë¿ÚµÄʼþ´¥·¢,µ«¿ÉÒÔ·Öʱ¸´Óá£Ëü¿ÉÒÔÅäÖÃΪÉÏÉýÑØ,
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* ϽµÑØ»òË«±ßÑØ´¥·¢¡£
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*/
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void init_ov7670_vsync(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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EXTI_InitTypeDef EXTI_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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/* ³õʼ»¯PE4¿ÚΪGPIOÊäÈëģʽ */
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE|RCC_APB2Periph_AFIO, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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/* ½«PE4(VSYNC)¹Òµ½³õʼ»¯ÎªEXTI4ģʽ,²¢Ê¹ÓÃÉÏÉýÑØ´¥·¢:
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* OV7670ʹÓÃVGAʱÐò´«ÊäÊý¾Ý,VSYNCµÄϽµÑرíʾһ֡Êý¾Ý
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* (¼´Ò»¸±Í¼Ïñ)µÄ´«Ê俪ʼ,VSYNNµÄÉÏÉýÑرíʾһ֡Êý¾ÝµÄ´«Êä½áÊø */
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GPIO_EXTILineConfig(GPIO_PortSourceGPIOE, GPIO_PinSource4);
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EXTI_InitStructure.EXTI_Line = EXTI_Line4;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //ÖжÏģʽ
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; //ÉÏÉýÑØ´¥·¢
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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/* ·ÖÅäVSYNCÖжÏÓÅÏȼ¶ */
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
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NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn ; //ÍⲿÖжÏ4
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //ÇÀÕ¼ÓÅÏȼ¶ 0
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //×ÓÓÅÏȼ¶0
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //ʹÄÜ
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NVIC_Init(&NVIC_InitStructure);
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}
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void EXTI4_IRQHandler(void)
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{
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if( RESET != EXTI_GetITStatus(EXTI_Line4) )
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{
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/*µÚÒ»´ÎVSYNCµÄϽµÑص½À´,˵Ã÷ÕâʱºòÉÏÒ»Ö¡Êý¾ÝÒѾ½áÊø,
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Ò²¾ÍÊÇÕâÒ»Ö¡Êý¾Ý¿ªÊ¼.Õâʱ¿ªÊ¼ÈÃÉãÏñÍ·µÄÊý¾Ýдµ½FIFOÖÐÈ¥*/
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if( 0==g_OV7670_VSYNC )
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{
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FIFO_WE_H(); /* À¸ßʹFIFOдʹÄÜ */
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g_OV7670_VSYNC = 1;
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FIFO_WE_H(); /* À¸ßʹFIFOдʹÄÜ */
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}
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/*µÚ¶þ´ÎVSYNCµÄϽµÑص½À´,˵Ã÷ÕâÒ»Ö¡µÄÊý¾Ý´«ÊäÒѾ½áÊø,´ËʱFIFO
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ÀïÃæ¾ÍÒѾ»º³åºÃOV7670д½øÀ´µÄÍêÕûµÄRGB565 320*240µÄͼÏóÊý¾Ý,
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ÏÖÔھͽûÖ¹ÉãÏñÍ·µÄÊý¾ÝдÈëµ½FIFOÖÐÈ¥,²¢¸üÐÂg_OV7670_VSYNC*/
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else if( 1==g_OV7670_VSYNC )
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{
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FIFO_WE_L(); /* ÀµÍʹFIFOдֹͣ */
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g_OV7670_VSYNC = 2;
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}
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/*ÔÚÓ¦ÓóÌÐòÖÐÑ»·¼ì²â±êÖ¾±äÁ¿,g_OV7670_VSYNC=2ʱ¾Í¿ÉÒÔ¶ÁFIFOÖеÄÊý¾Ý,
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¶ÁÈ¡ÍêFIFOÖеÄÊý¾Ýºó,Ó¦¸ÃÁ¢¿Ì½«g_OV7670_VSYNCÉèÖÃΪ0 */
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EXTI_ClearITPendingBit(EXTI_Line4);
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}
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}
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static __inline int ov_read_reg(u16 reg, u8 *val)
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{
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if( !I2C_ReadByte(val, 1, reg, OV7670_ADDR) )
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return -1;
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return 0;
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}
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static __inline int ov_write_reg(u16 reg, u8 val)
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{
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return !I2C_WriteByte(reg, val, OV7670_ADDR);
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}
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int ov_write_regs(const ov_regval_t *pReglist )
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{
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const ov_regval_t *pNext = pReglist ;
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while ( !((pNext->reg == OV_REG_TERM) && (pNext->val == OV_VAL_TERM)) )
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{
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if(pNext->reg == 0xFE)
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{
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msleep(5);
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}
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else
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{
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if( ov_write_reg(pNext->reg, pNext->val) )
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{
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return 1;
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}
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}
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pNext++ ;
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}
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return 0;
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}
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/* ³õʼ»¯OV7670ÄÚ²¿¸÷¸ö¼Ä´æÆ÷ */
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int init_ov7670_reg(int output_fmt)
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{
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u8 ID_code = 0;
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/*³õʼ»¯PE2/PE3Á½¸ö¹Ü½Å,ËûÃÇÓÃÀ´GPIOÄ£ÄâI2C×ÜÏß*/
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init_sccb_gpio();
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/* ͨ¹ýдOV7670µÄCOM7¼Ä´æÆ÷µÄbit[7]À´ÖØÆôËü */
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if( ov_write_reg(OV7670_REG_COM7, 1<<7) )
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{
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return 1 ;
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}
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msleep(15);
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/* ´Ó¼Ä´æÆ÷ÖжÁ³ö²úÆ·ID²¢ÅжÏÊÇ·ñÊÇOV7670µÄID */
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if( ov_read_reg(OV7670_REG_VERID, &ID_code) )
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{
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return 2;
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}
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if(ID_code != OV7670_VERID)
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{
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return 3;
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}
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/* ³õʼ»¯OV7670µÄÆäËû¼Ä´æÆ÷ */
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ov_write_regs(ov7670_default_regs);
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switch(output_fmt)
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{
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case FMT_QVGA_YUV422:
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ov_write_regs(ov7670_fmt_qvga_yuv422);
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break;
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case FMT_QVGA_RGB565:
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ov_write_regs(ov7670_fmt_qvga_rgb565);
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break;
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case FMT_QVGA_RGB444:
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ov_write_regs(ov7670_fmt_qvga_rgb444);
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break;
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case FMT_QVGA_RAWRGB:
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ov_write_regs(ov7670_fmt_qvga_raw);
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break;
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}
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return 0;
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}
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int OV7670_Initialize(int output_fmt)
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{
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init_ov7670_fifo_pin();
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/* ±ØÐëÔÚÕ⸴λһÏÂLCD */
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LCD_RST_SET(0);
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msleep(200);
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LCD_RST_SET(1);
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while( 0!=init_ov7670_reg(output_fmt) ) ; /* Èç¹û¼Ä´æÆ÷³õʼ»¯Ê§°ÜÔò»áËÀÔÚÕâÀï */
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init_ov7670_vsync();
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msleep(50);
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return 0;
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}
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/* ²Î¿¼ ov7670·Ö±æÂÊÉèÖÃ.pdf */
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void ov7670_config_window_size(u16 startx, u16 starty, u16 width, u16 height)
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{
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u16 endx = (startx+width*2)/784;
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u16 endy = (starty+height*2);
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u8 x_reg, y_reg, v;
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ov_read_reg(REG_HREF, &x_reg );
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x_reg &= 0xC0;
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ov_read_reg(REG_VREF, &y_reg );
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y_reg &= 0xF0;
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//ÉèÖÃ HREF
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v = x_reg|((endx&0x7)<<3)|(startx&0x7);
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ov_write_reg(REG_HREF, v );
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v = (startx&0x7F8)>>3;
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ov_write_reg(REG_HSTART, v );
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v = (endx&0x7F8)>>3;
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ov_write_reg(REG_HSTOP, v );
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//ÉèÖÃ VREF
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v = y_reg|((endy&0x3)<<2)|(starty&0x3);
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ov_write_reg(REG_VREF, v );
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v = (starty&0x3FC)>>2;
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ov_write_reg(REG_VSTART, v );
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v = (endy&0x3FC)>>2;
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ov_write_reg(REG_VSTOP, v );
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}
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