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rusefi 2020-05-04 13:28:00 -04:00
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firmware/console/console_io.cpp
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@ -6,6 +6,22 @@
*
* This file is part of rusEfi - see http://rusefi.com
*
* rusEFI can communicate with external universe via native USB or some sort of TTL mode
* We have an interesting situation with TTL communication channels, we have
* 1) SERIAL - this one was implemented first simply because the code was readily available (works on stm32)
* this one is most suitable for streaming HAL API
* this one is not great since each byte requires an IRQ and with enough IRQ delay we have a risk of data loss
* 2) UART DMA - the best one since FIFO buffer reduces data loss (works on stm32)
* We have two halves of DMA buffer - one is used for TTL while rusEFI prepares next batch of data in the other side.
* We need idle support in order to not wait for the complete buffer to get full in order to recieve a message.
* Back when we were implementing this STM32_DMA_CR_HTIE was not available in ChibiOS driver so we have added it.
* we have custom rusEFI changes to ChibiOS HAL driver v1
* F7 uses driver v2 which currently does not have rusEFI changes.
* open question if fresh ChibiOS is better in this regard.
* 3) UART this one is useful on platforms with hardware FIFO buffer like Kinetis.
* stm32 does not have such buffer so for stm32 UART without DMA has no advantages
*
*
* rusEfi is free software; you can redistribute it and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.