tests.drivers.spi_loopback stm32wb55x transfer multiple buffers with dma #25244
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erwango
added
platform: STM32
erwango
requested changes
May 12, 2020
FRASTM
commented
May 12, 2020
This change avoids the reload of the dma channel in the callback function, just sets the corresponding Tx, Rx flag. Signed-off-by: Francois Ramu <francois.ramu@st.com>
With this change, the spi transceive with dma function waits for the spi busy flag reset and for the dma transfer end. Then it reloads the channels until all buffers are consumed. Signed-off-by: Francois Ramu <francois.ramu@st.com>
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erwango
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May 13, 2020
carlescufi
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May 13, 2020
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The spi test application is transferring several buffers and check that Rx one equals Tx one.
In this configuration of the stm32wb It is using the dma communication capability of the SPI feature.
In transmission mode, when the DMA has written all the data to be transmitted (the TCIF
flag is set in the DMA_ISR register), the BSY flag can be monitored to ensure that the SPI
communication is complete.
This is done waiting for the SPI BUSY flag before considering the DMA Tx and Rx completion flags. The DMA callback function, based on the DMA channel irq, will set "a end of transfer" flag.
The main SPI client transfer loop will then switch the Tx/Rx buffers when both Rx and Tx are completed.
Refer to the Data transmission and reception procedures of the SPI feature in the Ref Manual.
Fix #25241