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Emulation: the UARTs receive by interrupt #125

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Merged
JohnAmadis merged 1 commit into from
Oct 11, 2026
Merged

Emulation: the UARTs receive by interrupt #125

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7 changes: 7 additions & 0 deletions modules/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,13 @@ if(DMBOOT_FLASH_DMD_FILES OR DMBOOT_MAIN_MODULE OR DMBOOT_SHELL)
COMMAND ${DMF_GET} -d "${DMBOOT_COMBINED_FLASH_DMD}" -o "${DMBOOT_MODULES_OUT_DIR}" -t "${DMOD_TOOLS_NAME}" --cpu-family "${DMBOOT_MCU_SERIES}" -y --type "${DMBOOT_MODULE_TYPE}" --config-dir "${DMBOOT_CONFIG_DIR}" --config-map "${DMBOOT_CONFIG_MAP}" --views-dir "${DMBOOT_EVIEWS_DIR}"
)
endif()
if(DMBOOT_EMULATION)
# Renode's USART cannot be served by DMA: the UARTs receive by interrupt
list(APPEND _FLASH_DOWNLOAD_COMMANDS
COMMAND ${CMAKE_COMMAND} -DDMUART_CONFIG_DIR=${DMBOOT_CONFIG_DIR}/drivers/dmuart
-P "${CMAKE_SOURCE_DIR}/scripts/emulation_uart_config.cmake"
)
endif()
list(APPEND _FLASH_DOWNLOAD_COMMANDS
COMMAND ${CMAKE_COMMAND} -E touch "${DMBOOT_MODULES_MARKER_FILE}"
)
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18 changes: 18 additions & 0 deletions scripts/emulation_uart_config.cmake
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@@ -0,0 +1,18 @@
# Emulation: the UARTs receive by interrupt.
#
# Renode's STM32F7 USART has no DMA request line, so a UART that receives by
# DMA (dmuart's default) gets nothing there - the console would not read a
# key. dmuart's `rx_dma=0` makes it receive by interrupt, which the model
# serves; the hardware keeps the DMA. Run on the driver configuration the
# modules brought (DMBOOT_CONFIG_DIR/drivers/dmuart/*.ini):
#
# cmake -DDMUART_CONFIG_DIR=<dir> -P emulation_uart_config.cmake
#
file(GLOB DMUART_INIS "${DMUART_CONFIG_DIR}/*.ini")
foreach(INI ${DMUART_INIS})
file(READ "${INI}" CONTENT)
if(CONTENT MATCHES "driver_name=dmuart" AND NOT CONTENT MATCHES "(^|\n)rx_dma=")
string(REGEX REPLACE "(\n[ \t]*rx_ring_size=[^\n]*)" "\\1\nrx_dma=0" CONTENT "${CONTENT}")
file(WRITE "${INI}" "${CONTENT}")
endif()
endforeach()
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