nxp: kinetis: decrease LPUART RAM usage #2610
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Refactor LPUART driver to only allocated RAM proportional to the number of enabled Uarts; each UART uses about 230 bytes for its state, so having a single UART enabled should provide a significant reduction in RAM usage. The driver's flash usage was also reduced, by about 20% when a single UART is being used. Signed-off-by: Fabio Utzig <utzig@apache.org>
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Refactor LPUart driver to only allocated RAM proportional to the number of enabled Uarts; each UART uses about 230 bytes for its state, so having a single UART enabled should provide a significant reduction in RAM usage.
The driver's flash usage was also reduced, by about 20% when a single UART is being used.