Merge pull request 'SPI HAL improvement' (#573) from eive/fsfw:mueller/spi-initialize-line-state into development

Reviewed-on: fsfw/fsfw#573

CHANGELOG.md

@@ -12,6 +12,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## Changes
 
+- HAL Linux SPI: Set the Clock Default State when setting new SPI speed
+  and mode
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/573
 - GPIO HAL: `Direction`, `GpioOperation` and `Levels` are enum classes now, which prevents
   name clashes with Windows defines.
   PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/572
@@ -23,11 +26,13 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## Removed
 
 - Removed the `HkSwitchHelper`. This module should not be needed anymore, now that the local
-  datapools have been implemented
+  datapools have been implemented.
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/557
 
 ## Additions
 
 - Linux HAL: Add wiretapping option for I2C. Enabled with `FSFW_HAL_I2C_WIRETAPPING` defined to 1
+  PR: https://egit.irs.uni-stuttgart.de/fsfw/fsfw/pulls/559
 
 # [v4.0.0]
 

hal/src/fsfw_hal/linux/spi/SpiComIF.cpp

@@ -401,4 +401,12 @@ void SpiComIF::setSpiSpeedAndMode(int spiFd, spi::SpiModes mode, uint32_t speed)
   if (retval != 0) {
     utility::handleIoctlError("SpiComIF::setSpiSpeedAndMode: Setting SPI speed failed");
   }
+  // This updates the SPI clock default polarity. Only setting the mode does not update
+  // the line state, which can be an issue on mode switches because the clock line will
+  // switch the state after the chip select is pulled low
+  clockUpdateTransfer.len = 0;
+  retval = ioctl(spiFd, SPI_IOC_MESSAGE(1), &clockUpdateTransfer);
+  if (retval != 0) {
+    utility::handleIoctlError("SpiComIF::setSpiSpeedAndMode: Updating SPI default clock failed");
+  }
 }

hal/src/fsfw_hal/linux/spi/SpiComIF.h

@@ -74,6 +74,7 @@ class SpiComIF : public DeviceCommunicationIF, public SystemObject {
   MutexIF* spiMutex = nullptr;
   MutexIF::TimeoutType timeoutType = MutexIF::TimeoutType::WAITING;
   uint32_t timeoutMs = 20;
+  spi_ioc_transfer clockUpdateTransfer = {};
 
   using SpiDeviceMap = std::unordered_map<address_t, SpiInstance>;
   using SpiDeviceMapIter = SpiDeviceMap::iterator;