I'm trying to get I2C to work in DMA mode from STM32Cube_FW_F7_V1.5.1
My first error was that the I2C handle remains busy after the first DMA transfer is complete.
I've looked at the procedure I2C_DMAMasterTransmitCplt in stm32f7xx_hal_i2c.c which gets called by DMA1_Stream0_IRQHandler()
It appears as though this code is vastly changed from v1.3.0 HAL and I can't immediately see how the DMA complete handler will reset the I2CHandle.State to be HAL_I2C_STATE_READY
As a test I've also tried Transmitting 4000 bytes through the I2C with:
HAL_I2C_Master_Transmit_DMA(&I2C1Handle, I2C_ADDRESS, OutBuf, 4000);
I've found that the DMA1_Stream0_IRQHandler() is called after 255 bytes are transmitted
I then call HAL_DMA_IRQHandler(I2C1Handle.hdmatx);
From then on, the I2C remains busy but no further bytes are transmitted.
Am I missing some more code within the DMA1_Stream0_IRQHandler procedure ?
A working example of I2C DMA tx and rx using the latest HAL would be great