DCMI and PSSI HAL DMA routines are not using half complete callbacks, but it is possible.

[Georgy Moshkin]

Hello. I've noticed that DCMI/PSSI code does not provide this functionality, but it is very handy when using DMA in circular mode (ADC, frame buffer pumping to other interfaces, etc.). I've tested DCMI+DMA circular mode on F4 and PSSI+DMA circular mode on H7 and it works well with complete/half compete interrupts. Just need to manually add an XferHalfCpltCallback:

/* Set the PSSI DMA transfer complete callback */
 hpssi->hdmarx->XferCpltCallback = &MY_PSSI_DMAReceiveCplt;
 hpssi->hdmarx->XferHalfCpltCallback = &MY_PSSI_DMAReceiveHalfCplt;