/*!
 * @file        readme.txt
 *
 * @brief       This file is routine instruction
 *
 * @version     V1.0.0
 *
 * @date        2023-01-11
 *
 * @attention
 *
 *  Copyright (C) 2018-2023 Geehy Semiconductor
 *
 *  You may not use this file except in compliance with the
 *  GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
 *
 *  The program is only for reference, which is distributed in the hope
 *  that it will be useful and instructional for customers to develop
 *  their software. Unless required by applicable law or agreed to in
 *  writing, the program is distributed on an "AS IS" BASIS, WITHOUT
 *  ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
 *  and limitations under the License.
 */

&par Example Description

The program aims to show how to use interrupt to get camera image data by using DCI, in this case,
DCI continuously get the data of the OV2640 camera through DMA and sends it to the host by USART1.
And OV2640 can be set to jpeg and rgb565 data output format.
Verification will occur after transmission,
Each time a complete frame is received , LED2 will be toggle.

The jpeg or rgb565 data can be displayed using serial assistant.
After power on, can switch between jpeg mode or rgb565 mode by KEY1 and KEY2.
KEY1 ----> rgb565 mode
KEY2 ----> jpeg mode

notes:
The jpeg image can be decoded by the host computer.
The rgb565 image can be displayed using LCD. But need to configure DMA and data output way.

&par Hardware Description

  - USART1_TX(PA9) ----> host_RX
  - USART1_RX(PA10)----> host_TX

  - USART1 configured as follow:
  - BaudRate = 115200
  - Word Length = USART_WordLength_8b
  - Stop Bit = USART_StopBits_1
  - Parity = USART_Parity_No
  - Hardware flow control disabled (RTS and CTS signals)
  - Receive and transmit enabled

  - SCCB_SCL(PD6)     ----> OV2640_SCCB_SCL
  - SCCB_SDA(PD7)     ----> OV2640_SCCB_SDA
  - OV2640_PWDN(PG9)  ----> OV2640_PWDN
  - OV2640_RST(PG15)  ----> OV2640_RESET
  - DCI_HSYNC(PA4)    ----> OV2640_HREF
  - DCI_PCLK(PA6)     ----> OV2640_PCLK
  - DCI_VSYNC(PB7)    ----> OV2640_VSYNC
  - DCI_D0(PC6)       ----> OV2640_Y0
  - DCI_D1(PC7)       ----> OV2640_Y1
  - DCI_D2(PC8)       ----> OV2640_Y2
  - DCI_D3(PC9)       ----> OV2640_Y3
  - DCI_D4(PC11)      ----> OV2640_Y4
  - DCI_D5(PB6)       ----> OV2640_Y5
  - DCI_D6(PB8)       ----> OV2640_Y6
  - DCI_D7(PB9)       ----> OV2640_Y7

&par Directory contents

  - DCI/DCI_OV2640/Source/apm32a4xx_int.c     Interrupt handlers
  - DCI/DCI_OV2640/Source/main.c              Main program
  - DCI/DCI_OV2640/Source/bsp_usart.c         Usart board support package body
  - DCI/DCI_OV2640/Source/bsp_ov2640.c        OV2640 board support package body
  - DCI/DCI_OV2640/Source/bsp_delay.c         Delay board support package body
  - DCI/DCI_OV2640/Source/bsp_dci.c           DCI board support package body
  - DCI/DCI_OV2640/Source/bsp_key.c           Key board support package body

&par IDE environment

  - MDK-ARM V5.29.0.0
  - EWARM V8.50.5.26295
  - Eclipse V2022-06(4.24.0)

&par Hardware and Software environment

  - This example runs on APM32A407_MINI Devices.
