STM32F407,OV9655 Camera,DCMI,USART

[Nagesh K]

Posted on February 12, 2017 at 11:59

I am using STM32F4 Discovery board,extension board & STM32F DIS Camera 1.3MP OV9655.

I am having two questions on this,

1] If I need to transfer image with 1280 x 1024 resolution then can I send from DCMI peripheral to USART directly or I need to store an image in external SRAM first then to USART??

2] If I need to store image with 1280 x 1024 resolution in SD card then what are the steps I need to follow??

Most of the examples on the internet are camera with LCD. In those examples image is stored from camera to LCD SRAM & from LCD SRAM to SD card. (Correct me if I am wrong)

I am not using LCD.

#usart #stm32f4-discovery #dcmi-dma-camera

[Tesla DeLorean]

Posted on February 12, 2017 at 13:47

One of the main problems here would be the massive disparity in data rates, the serial port being several orders of magnitude slower than the camera interface. 

[Nagesh K]

Posted on February 14, 2017 at 14:30

Thank You for your reply.

I need to use DCMI in snapshot mode. I am interested in single image not for video.

My plan is as follows,

1] Configure STM DIS cam 1.3MP for 120x160 resolution in RGB 565 mode(120x160x2Bytes)=38.4KB

2] Configure DCMI & DMA to store image in internal SRAM

3] Configure USART 921600 Baud rate(bits per sec) i.e.115.2 K Bytes ps

4] Start DCMI DMA

5] Send accepted data to USART

My question is whether this approach is right??

& what I want to do for transferring VGA image(640x480) in RGB565 require 614.4KB

Internal SRAM is very less & I don't want to use external memory to store the image.