Doorbell_8M

[中文]

1. Introduction

This project is a demo of a USB camera door lock, supporting end-to-end (BK7258 device) to mobile app demonstrations. The default PSRAM used is 8Mbyte.

1.1 Specifications

Please refer to Specifications

1.2 Path

<bk_avdk source code path>/projects/media/doorbell_8M

2. Framework diagram

Please refer to Framework diagram

3. Configuration

Please refer to Configuration

3.1 Differences

The difference between doorbell_8M and doorbell is that the previous configuration uses 8M PSRAM, while the latter configuration uses 16M PSRAM. The basic macro configuration of PSRAM on doorbell_8M project CPU0 is as follows:

marco	value	implication
CONFIG_PSRAM	Y	Enable PSRAM module
CONFIG_PSRAM_AS_SYS_MEMORY	Y	Enable PSRAM as Heap
CONFIG_USE_PSRAM_HEAP_AT_SRAM_OOM	N	Enable if cannot malloc mem from sram, can malloc from psram
CONFIG_PSRAM_HEAP_BASE	0x60700000	The start addres of psram as heap in current cpu(cpu0)
CONFIG_PSRAM_HEAP_SIZE	0x80000	The size of psram as heap in current cpu
CONFIG_PSRAM_HEAP_CPU0_BASE_ADDER	0x60700000	The start address of psram as heap

The basic macro configuration of PSRAM on doorbell_8M project CPU1 is as follows:

marco	value	implication
CONFIG_PSRAM	Y	Enable PSRAM module
CONFIG_PSRAM_AS_SYS_MEMORY	Y	Enable PSRAM as Heap
CONFIG_USE_PSRAM_HEAP_AT_SRAM_OOM	N	Enable if cannot malloc mem from sram, can malloc from psram
CONFIG_PSRAM_HEAP_BASE	0x60780000	The start addres of psram as heap in current cpu(cpu1)
CONFIG_PSRAM_HEAP_SIZE	0x80000	The size of psram as heap in current cpu
CONFIG_PSRAM_HEAP_CPU0_BASE_ADDER	0x60700000	The start address of psram as heap

From the above analysis, it can be concluded that for 8M psram, 0x60700000(CONFIG-PSRAM_SEAP_CPU0_SASE-ADDER) - 0x6800000 is used as a heap, On both cores, 0x80000 was allocated.

Warning

Please pay attention to whether the project and PSRAM size (model) are compatible when using it. If a 16M PSRAM configuration is used to run on an 8M board, the PSRAM used may exceed the maximum range, which may cause a dump.

4. Demonstration explanation

Please visit APP Usage Document

Demo result: During runtime, UVC, LCD, and AUDIO will be activated. The LCD will display UVC and output JPEG (864X480) images that have been decoded and rotated 90 degrees before being displayed on the LCD (480X854), After decoding, the YUV is encoded with H264 and transmitted to the mobile phone for display via WIFI (864X480).

Hint

If you do not have cloud account permissions, you can use debug mode to set the local area network TCP image transmission method.

5. Code explanation

Please refer to Code explanation