STM32 UART DRIVER : add support for buffer circular mode #80921
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I have not analyzed the PR in detail, but saw some fragments of code that could possibly touching a solution to discussion in: |
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This macro will help us to enable the 5th bit CIRC on the DMA_CCRx register for all stm32 series having this configuration. Thus the DMA will be able to handle the circular buffers. Signed-off-by: Fabrice DJIATSA <[email protected]> co-authored-by: Cyril Fougeray <[email protected]>
the following implementations are added: - set cyclic variable to handle circular/normal mode : enable dest/source_reload_en variable to set CIRC bit to 1 for RX or TX. - DMA_STATUS_COMPLETE(0), DMA_STATUS_BLOCK(1) macros to handle half and full irq - add ASYNC_UART_STATUS_TIMEOUT(3) macro to work with default mode - add status input in uart_stm32_dma_rx_flush function to handle async events depending on the mode we are in. Signed-off-by: Fabrice DJIATSA <[email protected]> co-authored-by: Cyril Fougeray <[email protected]>
This code example will demonstrate how to use uart circular mode on STM32 boards. Signed-off-by: Fabrice DJIATSA <[email protected]>
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will try that hopefully today! EDIT: works first try by using same DTS as in overlay :) |
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This PR introduces the implementation of the circular mode in the uart communication on the stm32 driver.
It is inspired by this commit 7275280#diff-54bdff4ff3a16e194201b66e24cada279fdfdd40dfd66b1df3df3a99d0f65cd0R1007 made by @fouge
The cyclic mode will be configured from the devicetree and will also have the management of the dma buffer with the integration of the half full and full irq .
This implementation is compatible with all STM32 series that have the CIRC bit at the 5th position of the DMA_CCRx register.
A sample driver has been made available and tested on the C0, F0 and G0 series with communication speeds reaching up to 500kbps.
Fixes #79831