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[资料] Image_DMA_API

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发表于 2018-4-9 14:43:53 | 显示全部楼层 |阅读模式 来自 广东省深圳市
Image_DMA_API

Image DMA consists of five DMA engines. They are JPEG Encoder DMA, Video DMA, Image Buffer Write 1 DMA
(IBW1 DMA), IBW2 DMA, and Image Buffer Read 1 DMA (IBR1 DMA). Each DMA engine has its own specific
purposes.
IMGDMA driver provides the interfaces for several scenarios including camera preview, mpeg4 decode,
mpeg 4 encode, jpeg encode, camera capture to jpeg encoder, camera capture to frame buffer, jpeg decode, gif
decode and image effects. The procedure of using IMGDMA driver is described as follow:
IMGDMA_Init => called by system initialization not customer of IMGDMA driver.
IMGDMA_Open => obtain the ownership of IMGDMA all channels and register the scenario ID.
IMGDMA_xxxConfig => configure the related channels and start it simultaneously
IMGDMA_Start => trigger the specify IMGDMA channel to start working.
IMGDMA_Stop =>stop the specify IMGDMA channel.
IMGDMA_Close => release the ownership the IMGDMA channel

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