mdma

问题 I'm using the FMC of the STM32H743 to drive a 16-bit 8080-bus LCD controller. I've tried using DMA, MDMA and a CPU-loop to transfer data to the 8080-bus, via the FMC. The transfer frequency does not depend on whether DMA, MDMA or CPU-loop is used. This make me think that the DMA/MDMA/CPU-loop is not the limiting factor. At a 480MHz FMC clock, the transfer happens at just 1.6MHz, giving me only 20fps on a 16-bit colour 320x240 LCD. At a 240MHz FMC clock, the transfer happens at just 0.8MHz,

问题 I'm using the FMC of the STM32H743 to drive a 16-bit 8080-bus LCD controller. I've tried using DMA, MDMA and a CPU-loop to transfer data to the 8080-bus, via the FMC. The transfer frequency does not depend on whether DMA, MDMA or CPU-loop is used. This make me think that the DMA/MDMA/CPU-loop is not the limiting factor. At a 480MHz FMC clock, the transfer happens at just 1.6MHz, giving me only 20fps on a 16-bit colour 320x240 LCD. At a 240MHz FMC clock, the transfer happens at just 0.8MHz,

问题 I'm using the FMC of the STM32H743 to drive a 16-bit 8080-bus LCD controller. I've tried using DMA, MDMA and a CPU-loop to transfer data to the 8080-bus, via the FMC. The transfer frequency does not depend on whether DMA, MDMA or CPU-loop is used. This make me think that the DMA/MDMA/CPU-loop is not the limiting factor. At a 480MHz FMC clock, the transfer happens at just 1.6MHz, giving me only 20fps on a 16-bit colour 320x240 LCD. At a 240MHz FMC clock, the transfer happens at just 0.8MHz,