目前设备运行lcdif和SPI DMA,SPI使用PIT 2.5us触发一次dma采集
问题:
DMA触发理论上应该要2.5us产生一个片选采集信号,但是目前会有0.5us的飘动,有时候2us,有时候3us,后面发现是LCDIF影响的,通过配置DMA优先级有问题,帮忙看下这个DMA优先级异常
```
edma_channel_Preemption_config_t edma_pconfig;
edma_pconfig.enableChannelPreemption = false;
edma_pconfig.enablePreemptAbility = true;
edma_pconfig.channelPriority = 15;
EDMA_SetChannelPreemptionConfig(EXAMPLE_LPSPI_MASTER_DMA_BASE, EXAMPLE_LPSPI_MASTER_DMA_TX_CHANNEL,
&edma_pconfig);
edma_pconfig.enableChannelPreemption = true;
edma_pconfig.enablePreemptAbility = true;
edma_pconfig.channelPriority = 14;
EDMA_SetChannelPreemptionConfig(EXAMPLE_LPSPI_MASTER_DMA_BASE, EXAMPLE_LPSPI_MASTER_DMA_RX_CHANNEL,
&edma_pconfig);
```
全部代码见附件