/* * Copyright (c) 2020, FrankLi Limited * * SPDX-License-Identifier: Apache-2.0 */ #define DT_DRV_COMPAT ovti_ov7725 #include #include #include #include #include #include #define LOG_LEVEL CONFIG_LOG_DEFAULT_LEVEL #include LOG_MODULE_REGISTER(ov7725); #define OV7725_REVISION 0x7721U #define OV7725_GAIN 0x00U #define OV7725_BLUE 0x01U #define OV7725_RED 0x02U #define OV7725_GREEN 0x03U #define OV7725_BAVG 0x05U #define OV7725_GAVG 0x06U #define OV7725_RAVG 0x07U #define OV7725_AECH 0x08U #define OV7725_COM2 0x09U #define OV7725_PID 0x0AU #define OV7725_VER 0x0BU #define OV7725_COM3 0x0CU #define OV7725_COM4 0x0DU #define OV7725_COM5 0x0EU #define OV7725_COM6 0x0FU #define OV7725_AEC 0x10U #define OV7725_CLKRC 0x11U #define OV7725_COM7 0x12U #define OV7725_COM8 0x13U #define OV7725_COM9 0x14U #define OV7725_COM10 0x15U #define OV7725_REG16 0x16U #define OV7725_HSTART 0x17U #define OV7725_HSIZE 0x18U #define OV7725_VSTART 0x19U #define OV7725_VSIZE 0x1AU #define OV7725_PSHFT 0x1BU #define OV7725_MIDH 0x1CU #define OV7725_MIDL 0x1DU #define OV7725_LAEC 0x1FU #define OV7725_COM11 0x20U #define OV7725_BDBASE 0x22U #define OV7725_BDMSTEP 0x23U #define OV7725_AEW 0x24U #define OV7725_AEB 0x25U #define OV7725_VPT 0x26U #define OV7725_REG28 0x28U #define OV7725_HOUTSIZE 0x29U #define OV7725_EXHCH 0x2AU #define OV7725_EXHCL 0x2BU #define OV7725_VOUTSIZE 0x2CU #define OV7725_ADVFL 0x2DU #define OV7725_ADVFH 0x2EU #define OV7725_YAVE 0x2FU #define OV7725_LUMHTH 0x30U #define OV7725_LUMLTH 0x31U #define OV7725_HREF 0x32U #define OV7725_DM_LNL 0x33U #define OV7725_DM_LNH 0x34U #define OV7725_ADOFF_B 0x35U #define OV7725_ADOFF_R 0x36U #define OV7725_ADOFF_GB 0x37U #define OV7725_ADOFF_GR 0x38U #define OV7725_OFF_B 0x39U #define OV7725_OFF_R 0x3AU #define OV7725_OFF_GB 0x3BU #define OV7725_OFF_GR 0x3CU #define OV7725_COM12 0x3DU #define OV7725_COM13 0x3EU #define OV7725_COM14 0x3FU #define OV7725_COM16 0x41U #define OV7725_TGT_B 0x42U #define OV7725_TGT_R 0x43U #define OV7725_TGT_GB 0x44U #define OV7725_TGT_GR 0x45U #define OV7725_LC_CTR 0x46U #define OV7725_LC_XC 0x47U #define OV7725_LC_YC 0x48U #define OV7725_LC_COEF 0x49U #define OV7725_LC_RADI 0x4AU #define OV7725_LC_COEFB 0x4BU #define OV7725_LC_COEFR 0x4CU #define OV7725_FIXGAIN 0x4DU #define OV7725_AREF1 0x4FU #define OV7725_AREF6 0x54U #define OV7725_UFIX 0x60U #define OV7725_VFIX 0x61U #define OV7725_AWBB_BLK 0x62U #define OV7725_AWB_CTRL0 0x63U #define OV7725_DSP_CTRL1 0x64U #define OV7725_DSP_CTRL2 0x65U #define OV7725_DSP_CTRL3 0x66U #define OV7725_DSP_CTRL4 0x67U #define OV7725_AWB_BIAS 0x68U #define OV7725_AWB_CTRL1 0x69U #define OV7725_AWB_CTRL2 0x6AU #define OV7725_AWB_CTRL3 0x6BU #define OV7725_AWB_CTRL4 0x6CU #define OV7725_AWB_CTRL5 0x6DU #define OV7725_AWB_CTRL6 0x6EU #define OV7725_AWB_CTRL7 0x6FU #define OV7725_AWB_CTRL8 0x70U #define OV7725_AWB_CTRL9 0x71U #define OV7725_AWB_CTRL10 0x72U #define OV7725_AWB_CTRL11 0x73U #define OV7725_AWB_CTRL12 0x74U #define OV7725_AWB_CTRL13 0x75U #define OV7725_AWB_CTRL14 0x76U #define OV7725_AWB_CTRL15 0x77U #define OV7725_AWB_CTRL16 0x78U #define OV7725_AWB_CTRL17 0x79U #define OV7725_AWB_CTRL18 0x7AU #define OV7725_AWB_CTRL19 0x7BU #define OV7725_AWB_CTRL20 0x7CU #define OV7725_AWB_CTRL21 0x7DU #define OV7725_GAM1 0x7EU #define OV7725_GAM2 0x7FU #define OV7725_GAM3 0x80U #define OV7725_GAM4 0x81U #define OV7725_GAM5 0x82U #define OV7725_GAM6 0x83U #define OV7725_GAM7 0x84U #define OV7725_GAM8 0x85U #define OV7725_GAM9 0x86U #define OV7725_GAM10 0x87U #define OV7725_GAM11 0x88U #define OV7725_GAM12 0x89U #define OV7725_GAM13 0x8AU #define OV7725_GAM14 0x8BU #define OV7725_GAM15 0x8CU #define OV7725_SLOP 0x8DU #define OV7725_DNSTH 0x8EU #define OV7725_EDGE0 0x8FU #define OV7725_EDGE1 0x90U #define OV7725_DNSOFF 0x91U #define OV7725_EDGE2 0x92U #define OV7725_EDGE3 0x93U #define OV7725_MTX1 0x94U #define OV7725_MTX2 0x95U #define OV7725_MTX3 0x96U #define OV7725_MTX4 0x97U #define OV7725_MTX5 0x98U #define OV7725_MTX6 0x99U #define OV7725_MTX_CTRL 0x9AU #define OV7725_BRIGHT 0x9BU #define OV7725_CNST 0x9CU #define OV7725_UVADJ0 0x9EU #define OV7725_UVADJ1 0x9FU #define OV7725_SCAL0 0xA0U #define OV7725_SCAL1 0xA1U #define OV7725_SCAL2 0xA2U #define OV7725_SDE 0xA6U #define OV7725_USAT 0xA7U #define OV7725_VSAT 0xA8U #define OV7725_HUECOS 0xA9U #define OV7725_HUESIN 0xAAU #define OV7725_SIGN 0xABU #define OV7725_DSPAUTO 0xACU #define OV7725_COM10_VSYNC_NEG_MASK BIT(1) #define OV7725_COM10_HREF_REVERSE_MASK BIT(3) #define OV7725_COM10_PCLK_REVERSE_MASK BIT(4) #define OV7725_COM10_PCLK_OUT_MASK BIT(5) #define OV7725_COM10_DATA_NEG_MASK BIT(7) struct ov7725_config { struct i2c_dt_spec i2c; #if DT_INST_NODE_HAS_PROP(0, reset_gpios) struct gpio_dt_spec reset_gpio; #endif }; struct ov7725_data { struct video_format fmt; }; struct ov7725_clock { uint32_t input_clk; uint32_t framerate; uint8_t clkrc; /*!< Register CLKRC. */ uint8_t com4; /*!< Register COM4. */ uint8_t dm_lnl; /*!< Register DM_LNL. */ }; struct ov7725_pixel_format { uint32_t pixel_format; uint8_t com7; }; struct ov7725_reg { uint8_t addr; uint8_t value; }; static const struct ov7725_clock ov7725_clock_configs[] = { { .input_clk = 24000000, .framerate = 30, .clkrc = 0x01, .com4 = 0x41, .dm_lnl = 0x00 }, { .input_clk = 24000000, .framerate = 15, .clkrc = 0x03, .com4 = 0x41, .dm_lnl = 0x00 }, { .input_clk = 24000000, .framerate = 25, .clkrc = 0x01, .com4 = 0x41, .dm_lnl = 0x66 }, { .input_clk = 24000000, .framerate = 14, .clkrc = 0x03, .com4 = 0x41, .dm_lnl = 0x1a }, { .input_clk = 26000000, .framerate = 30, .clkrc = 0x01, .com4 = 0x41, .dm_lnl = 0x2b }, { .input_clk = 26000000, .framerate = 15, .clkrc = 0x03, .com4 = 0x41, .dm_lnl = 0x2b }, { .input_clk = 26000000, .framerate = 25, .clkrc = 0x01, .com4 = 0x41, .dm_lnl = 0x99 }, { .input_clk = 26000000, .framerate = 14, .clkrc = 0x03, .com4 = 0x41, .dm_lnl = 0x46 }, { .input_clk = 13000000, .framerate = 30, .clkrc = 0x00, .com4 = 0x41, .dm_lnl = 0x2b }, { .input_clk = 13000000, .framerate = 15, .clkrc = 0x01, .com4 = 0x41, .dm_lnl = 0x2b }, { .input_clk = 13000000, .framerate = 25, .clkrc = 0x00, .com4 = 0x41, .dm_lnl = 0x99 }, { .input_clk = 13000000, .framerate = 14, .clkrc = 0x01, .com4 = 0x41, .dm_lnl = 0x46 }, }; static const struct ov7725_pixel_format ov7725_pf_configs[] = { { .pixel_format = VIDEO_PIX_FMT_RGB565, .com7 = (1 << 2) | (2) } }; static const struct ov7725_reg ov7725_init_reg_tb[] = { /*Output config*/ { OV7725_CLKRC, 0x00 }, { OV7725_COM7, 0x06 }, { OV7725_HSTART, 0x3f }, { OV7725_HSIZE, 0x50 }, { OV7725_VSTART, 0x03 }, { OV7725_VSIZE, 0x78 }, { OV7725_HREF, 0x00 }, { OV7725_HOUTSIZE, 0x50 }, { OV7725_VOUTSIZE, 0x78 }, /*DSP control*/ { OV7725_TGT_B, 0x7f }, { OV7725_FIXGAIN, 0x09 }, { OV7725_AWB_CTRL0, 0xe0 }, { OV7725_DSP_CTRL1, 0xff }, { OV7725_DSP_CTRL2, 0x00 }, { OV7725_DSP_CTRL3, 0x00 }, { OV7725_DSP_CTRL4, 0x00 }, /*AGC AEC AWB*/ { OV7725_COM8, 0xf0 }, { OV7725_COM4, 0x81 }, { OV7725_COM6, 0xc5 }, { OV7725_COM9, 0x11 }, { OV7725_BDBASE, 0x7F }, { OV7725_BDMSTEP, 0x03 }, { OV7725_AEW, 0x40 }, { OV7725_AEB, 0x30 }, { OV7725_VPT, 0xa1 }, { OV7725_EXHCL, 0x9e }, { OV7725_AWB_CTRL3, 0xaa }, { OV7725_COM8, 0xff }, /*matrix sharpness brightness contrast*/ { OV7725_EDGE1, 0x08 }, { OV7725_DNSOFF, 0x01 }, { OV7725_EDGE2, 0x03 }, { OV7725_EDGE3, 0x00 }, { OV7725_MTX1, 0xb0 }, { OV7725_MTX2, 0x9d }, { OV7725_MTX3, 0x13 }, { OV7725_MTX4, 0x16 }, { OV7725_MTX5, 0x7b }, { OV7725_MTX6, 0x91 }, { OV7725_MTX_CTRL, 0x1e }, { OV7725_BRIGHT, 0x08 }, { OV7725_CNST, 0x20 }, { OV7725_UVADJ0, 0x81 }, { OV7725_SDE, 0X06 }, { OV7725_USAT, 0x65 }, { OV7725_VSAT, 0x65 }, { OV7725_HUECOS, 0X80 }, { OV7725_HUESIN, 0X80 }, /*GAMMA config*/ { OV7725_GAM1, 0x0c }, { OV7725_GAM2, 0x16 }, { OV7725_GAM3, 0x2a }, { OV7725_GAM4, 0x4e }, { OV7725_GAM5, 0x61 }, { OV7725_GAM6, 0x6f }, { OV7725_GAM7, 0x7b }, { OV7725_GAM8, 0x86 }, { OV7725_GAM9, 0x8e }, { OV7725_GAM10, 0x97 }, { OV7725_GAM11, 0xa4 }, { OV7725_GAM12, 0xaf }, { OV7725_GAM13, 0xc5 }, { OV7725_GAM14, 0xd7 }, { OV7725_GAM15, 0xe8 }, { OV7725_SLOP, 0x20 }, { OV7725_COM3, 0x40 }, { OV7725_COM5, 0xf5 }, { OV7725_COM10, 0x02 }, { OV7725_COM2, 0x01 } }; static int ov7725_write_reg(const struct i2c_dt_spec *spec, uint8_t reg_addr, uint8_t value) { struct i2c_msg msgs[2]; msgs[0].buf = (uint8_t *)®_addr; msgs[0].len = 1; msgs[0].flags = I2C_MSG_WRITE; msgs[1].buf = (uint8_t *)&value; msgs[1].len = 1; msgs[1].flags = I2C_MSG_WRITE | I2C_MSG_STOP; return i2c_transfer_dt(spec, msgs, 2); } static int ov7725_read_reg(const struct i2c_dt_spec *spec, uint8_t reg_addr, uint8_t *value) { struct i2c_msg msgs[2]; msgs[0].buf = (uint8_t *)®_addr; msgs[0].len = 1; /* * When using I2C to read the registers of the SCCB device, * a stop bit is required after writing the register address */ msgs[0].flags = I2C_MSG_WRITE | I2C_MSG_STOP; msgs[1].buf = (uint8_t *)value; msgs[1].len = 1; msgs[1].flags = I2C_MSG_READ | I2C_MSG_STOP | I2C_MSG_RESTART; return i2c_transfer_dt(spec, msgs, 2); } int ov7725_modify_reg(const struct i2c_dt_spec *spec, uint8_t reg_addr, uint8_t clear_mask, uint8_t value) { int ret; uint8_t set_value; ret = ov7725_read_reg(spec, reg_addr, &set_value); if (ret == 0) { set_value = (set_value & (~clear_mask)) | (set_value & clear_mask); ret = ov7725_write_reg(spec, reg_addr, set_value); } return ret; } static int ov7725_write_all(const struct device *dev, const struct ov7725_reg *regs, uint16_t reg_num) { uint16_t i = 0; const struct ov7725_config *cfg = dev->config; for (i = 0; i < reg_num; i++) { int err; err = ov7725_write_reg(&cfg->i2c, regs[i].addr, regs[i].value); if (err) { return err; } } return 0; } static int ov7725_set_clock(const struct device *dev, unsigned int framerate, unsigned int input_clk) { const struct ov7725_config *cfg = dev->config; for (unsigned int i = 0; i < ARRAY_SIZE(ov7725_clock_configs); i++) { if ((ov7725_clock_configs[i].framerate == framerate) && (ov7725_clock_configs[i].input_clk == input_clk)) { ov7725_write_reg(&cfg->i2c, OV7725_CLKRC, ov7725_clock_configs[i].clkrc); ov7725_modify_reg(&cfg->i2c, OV7725_COM4, 0xc0, ov7725_clock_configs[i].com4); ov7725_write_reg(&cfg->i2c, OV7725_EXHCL, 0x00); ov7725_write_reg(&cfg->i2c, OV7725_DM_LNL, ov7725_clock_configs[i].dm_lnl); ov7725_write_reg(&cfg->i2c, OV7725_DM_LNH, 0x00); ov7725_write_reg(&cfg->i2c, OV7725_ADVFL, 0x00); ov7725_write_reg(&cfg->i2c, OV7725_ADVFH, 0x00); return ov7725_write_reg(&cfg->i2c, OV7725_COM5, 0x65); } } return -1; } static int ov7725_set_fmt(const struct device *dev, enum video_endpoint_id ep, struct video_format *fmt) { struct ov7725_data *drv_data = dev->data; const struct ov7725_config *cfg = dev->config; uint8_t com10 = 0; uint16_t width, height; uint16_t hstart, vstart, hsize; int ret; /* we only support one format for now (VGA RGB565) */ if (fmt->pixelformat != VIDEO_PIX_FMT_RGB565 || fmt->height != 480 || fmt->width != 640) { return -ENOTSUP; } width = fmt->width; height = fmt->height; if (!memcmp(&drv_data->fmt, fmt, sizeof(drv_data->fmt))) { /* nothing to do */ return 0; } drv_data->fmt = *fmt; /* Configure Sensor */ ret = ov7725_write_all(dev, ov7725_init_reg_tb, ARRAY_SIZE(ov7725_init_reg_tb)); if (ret) { LOG_ERR("Unable to write ov7725 config"); return ret; } /* Set clock : framerate 30fps, input clock 24M*/ ov7725_set_clock(dev, 30, 24000000); /* Set output format */ for (uint8_t i = 0; i < ARRAY_SIZE(ov7725_pf_configs); i++) { if (ov7725_pf_configs[i].pixel_format == fmt->pixelformat) { ret = ov7725_modify_reg(&cfg->i2c, OV7725_COM7, 0x1FU, ov7725_pf_configs[i].com7); if (ret) { LOG_ERR("Unable to write ov7725 pixel format"); return ret; } } } ov7725_modify_reg(&cfg->i2c, OV7725_COM7, (1 << 5), (0 << 5)); com10 |= OV7725_COM10_VSYNC_NEG_MASK; ov7725_write_reg(&cfg->i2c, OV7725_COM10, com10); /* Don't swap output MSB/LSB. */ ov7725_write_reg(&cfg->i2c, OV7725_COM3, 0x00); /* * Output drive capability * 0: 1X * 1: 2X * 2: 3X * 3: 4X */ ov7725_modify_reg(&cfg->i2c, OV7725_COM2, 0x03, 0x03); /* Resolution and timing. */ hstart = 0x22U << 2U; vstart = 0x07U << 1U; hsize = width + 16U; /* Set the window size. */ ov7725_write_reg(&cfg->i2c, OV7725_HSTART, hstart >> 2U); ov7725_write_reg(&cfg->i2c, OV7725_HSIZE, hsize >> 2U); ov7725_write_reg(&cfg->i2c, OV7725_VSTART, vstart >> 1U); ov7725_write_reg(&cfg->i2c, OV7725_VSIZE, height >> 1U); ov7725_write_reg(&cfg->i2c, OV7725_HOUTSIZE, width >> 2U); ov7725_write_reg(&cfg->i2c, OV7725_VOUTSIZE, height >> 1U); ov7725_write_reg(&cfg->i2c, OV7725_HREF, ((vstart & 1U) << 6U) | ((hstart & 3U) << 4U) | ((height & 1U) << 2U) | ((hsize & 3U) << 0U)); return ov7725_write_reg(&cfg->i2c, OV7725_EXHCH, ((height & 1U) << 2U) | ((width & 3U) << 0U)); } static int ov7725_get_fmt(const struct device *dev, enum video_endpoint_id ep, struct video_format *fmt) { struct ov7725_data *drv_data = dev->data; *fmt = drv_data->fmt; return 0; } static int ov7725_stream_start(const struct device *dev) { return 0; } static int ov7725_stream_stop(const struct device *dev) { return 0; } static const struct video_format_cap fmts[] = { { .pixelformat = VIDEO_PIX_FMT_RGB565, .width_min = 640, .width_max = 640, .height_min = 480, .height_max = 480, .width_step = 0, .height_step = 0, }, { 0 } }; static int ov7725_get_caps(const struct device *dev, enum video_endpoint_id ep, struct video_caps *caps) { caps->format_caps = fmts; return 0; } static const struct video_driver_api ov7725_driver_api = { .set_format = ov7725_set_fmt, .get_format = ov7725_get_fmt, .get_caps = ov7725_get_caps, .stream_start = ov7725_stream_start, .stream_stop = ov7725_stream_stop, }; static int ov7725_init(const struct device *dev) { const struct ov7725_config *cfg = dev->config; struct video_format fmt; uint8_t pid, ver; int ret; #if DT_INST_NODE_HAS_PROP(0, reset_gpios) ret = gpio_pin_configure_dt(&cfg->reset_gpio, GPIO_OUTPUT_ACTIVE); if (ret) { return ret; } gpio_pin_set_dt(&cfg->reset_gpio, 0); k_sleep(K_MSEC(1)); gpio_pin_set_dt(&cfg->reset_gpio, 1); k_sleep(K_MSEC(1)); #endif /* Identify the device. */ ret = ov7725_read_reg(&cfg->i2c, OV7725_PID, &pid); if (ret) { LOG_ERR("Unable to read PID"); return -ENODEV; } ret = ov7725_read_reg(&cfg->i2c, OV7725_VER, &ver); if (ret) { LOG_ERR("Unable to read VER"); return -ENODEV; } if (OV7725_REVISION != (((uint32_t)pid << 8U) | (uint32_t)ver)) { LOG_ERR("OV7725 Get Vision fail\n"); return -ENODEV; } /* Device identify OK, perform software reset. */ ov7725_write_reg(&cfg->i2c, OV7725_COM7, 0x80); k_sleep(K_MSEC(2)); /* set default/init format VGA RGB565 */ fmt.pixelformat = VIDEO_PIX_FMT_RGB565; fmt.width = 640; fmt.height = 480; fmt.pitch = 640 * 2; ret = ov7725_set_fmt(dev, VIDEO_EP_OUT, &fmt); if (ret) { LOG_ERR("Unable to configure default format"); return -EIO; } return 0; } /* Unique Instance */ static const struct ov7725_config ov7725_cfg_0 = { .i2c = I2C_DT_SPEC_INST_GET(0), #if DT_INST_NODE_HAS_PROP(0, reset_gpios) .reset_gpio = GPIO_DT_SPEC_INST_GET(0, reset_gpios), #endif }; static struct ov7725_data ov7725_data_0; static int ov7725_init_0(const struct device *dev) { const struct ov7725_config *cfg = dev->config; if (!device_is_ready(cfg->i2c.bus)) { LOG_ERR("Bus device is not ready"); return -ENODEV; } #if DT_INST_NODE_HAS_PROP(0, reset_gpios) if (!device_is_ready(cfg->reset_gpio.port)) { LOG_ERR("%s: device %s is not ready", dev->name, cfg->reset_gpio.port->name); return -ENODEV; } #endif return ov7725_init(dev); } DEVICE_DT_INST_DEFINE(0, &ov7725_init_0, NULL, &ov7725_data_0, &ov7725_cfg_0, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &ov7725_driver_api);