Hi everyone. I have an issue with USB transmission in DMA mode (USB_OTG_HS, internal PHY, FullSpeed 12MBit/s). I am using a Cube generated project for STM32H743IGT6. If I disable DMA - it works fine.
But when I enable DMA USB enumerates on PC and all is ok, at first look. Data receives and transmits. But if I start to transmit data to PC, it transmits until the total quantity reaches 313 WORDS. If I send by one byte, it makes 313 sends and after that CDC_Transmit_HS doesn't send anything and the interface is in TX state. If I send by two bytes it makes the same 313 packages (626 bytes total). If I send 1252 bytes - it sends, but after that I can't send anything. I am using FreeRtos and all memory allocated in SRAM1-SRAM2 domain (0x30000000) and MPU unit sets as:
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER3;
MPU_InitStruct.BaseAddress = 0x30000000;
MPU_InitStruct.Size = MPU_REGION_SIZE_256KB;
MPU_InitStruct.SubRegionDisable = 0x0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
I try to totally disable cache and MPU by commend call of MPU_Config and SCB_EnableDCache - no effect, same issue.
