[PR] Imx9 enable lpspi pcs manual control [nuttx]

["jlaitine (via GitHub)" <gi...@apache.org>]

jlaitine opened a new pull request, #17347:
URL: https://github.com/apache/nuttx/pull/17347

   ## Summary
   
   This PR adds a function imx9_lpspi_select_cs to assert CS at the start of an SPI transfer and keep it asserted until called again to de-assert it. This can be called by board-provided imx9_lpspi_select, in case the CS needs to be controlled via the LPSPI block and not GPIO.
   
   The TCR register CONT (continue) bit is asserted to prevent CS toggling during the transfer, and the PCS bits are set to mark the correct CS
   
   ## Impact
   
   Impacts only imx9 designs using LPSPI. Doesn't impact existing designs, adds a new feature, enabling to use the internal CS signal of the SPI block.
   
   ## Testing
   
   Tested on a custom IMX9 board, with icm42605 IMU sensor connected to LPSPI. Previously, had the CS signal muxed to GPIO1_IO11 (IOMUXC_PAD_SAI1_TXFS_GPIO1_IO11), and moved that to internal PCS signal (IOMUXC_PAD_SAI1_TXFS_LPSPI1_PCS0).
   
   Tested in PX4 environment, showing that all (log):
   
   > listener sensor_gyro -i 2
   
   TOPIC: sensor_gyro instance 2 #1
    sensor_gyro
       timestamp: 13508265 (0.001096 seconds ago)
       timestamp_sample: 13508135 (130 us before timestamp)
       device_id: 2686986 (Type: 0x29, SPI:1 (0x00))
       x: -0.00207
       y: 0.00133
       z: -0.00756
       temperature: 50.4
   


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Re: [PR] Imx9 enable lpspi pcs manual control [nuttx]

["acassis (via GitHub)" <gi...@apache.org>]

acassis merged PR #17347:
URL: https://github.com/apache/nuttx/pull/17347


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