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Previously these macros took a small integer to identify the USART to access. This integer was token concatenated to form the macro name that resolved to the base address. This made it imposible to use these macros in a driver that could manage more than one USART because there was no runtime way to go from base address (or other unique identifier) to register address. This change makes it possible to pass either a static compile time known base address or a runtime variable with the base address, thus supporting either sort of driver. The existing USART driver has been updated to compute the base address of the console USART and pass that at compile time, resulting in no increase in code size. Signed-off-by: Anton Staaf <robotboy@chromium.org> BRANCH=none TEST=make buildall -j Followed by manual testing of console over UART functionality on the STM32F072 based discovery board. Change-Id: I06547a173b1e5cf625a57019ea4b8a84d1768444 Reviewed-on: https://chromium-review.googlesource.com/208488 Reviewed-by: Randall Spangler <rspangler@chromium.org> Commit-Queue: Anton Staaf <robotboy@chromium.org> Tested-by: Anton Staaf <robotboy@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit