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STM32 Discovery+OV2640 image too dark

Question asked by d.david on Oct 28, 2013
Latest reply on Oct 28, 2013 by Clive One
Hi everybody,
I'm working with OV2640 and i've problem with brightness. I use TFT LCD to display, use config from STM32F4xx_DSP_StdPeriph_Lib ( dcmi_ov2640.c). DMA and DCMI working fine but the image i receive too dark. So, i use :
void OV2640_BrightnessConfig(uint8_t Brightness)
{
  OV2640_WriteReg(0xff, 0x00);
  OV2640_WriteReg(0x7c, 0x00);
  OV2640_WriteReg(0x7d, 0x04);
  OV2640_WriteReg(0x7c, 0x09);
  OV2640_WriteReg(0x7d, Brightness);
  OV2640_WriteReg(0x7d, 0x00);
}
to increase brightness but the image still dark. I check datasheet of ov2640 for 0x7c and 0x7d reg but i can't find it. I think the config for this ov2640 is wrong, i want to correct it but they config a lot of regs that doesn't describe in the datasheet. I'm going to contact ovt for these reg setting, hope they answer...




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