added spi mux functionality to the rwSpiCallback

bsp_q7s/spiCallbacks/rwSpiCallback.h

@@ -3,6 +3,10 @@
 
 #include <fsfw/returnvalues/HasReturnvaluesIF.h>
 #include <fsfw_hal/linux/spi/SpiComIF.h>
+#include <fsfw_hal/common/gpio/GpioCookie.h>
+
+
+namespace rwSpiCallback {
 
 /**
  * @brief   This is the callback function to send commands to the nano avionics reaction wheels and
@@ -14,8 +18,17 @@
  *          Arbeitsdaten/08_Used%20Components/Nanoavionics_Reactionwheels&fileid=181622
  *          Each command entails exactly one reply which will also be read in and decoded by this
  *          function.
+ *          Because the reaction wheels require a spi clock frequency of maximum 300 kHZ and minimum
+ *          150 kHz which is not supported by the processing system SPI peripheral an AXI SPI core
+ *          has been implemented in the programmable logic. This AXI SPI core works with a fixed
+ *          frequency of 250 kHz.
+ *          To allow the parallel usage of the same physical SPI bus, a VHDL module has been
+ *          implemented which is able to disconnect the hard-wired SPI peripheral of the PS and
+ *          route the AXI SPI to the SPI lines.
+ *          To switch between the to SPI peripherals, an EMIO is used which will also be controlled
+ *          by this function.
  */
-ReturnValue_t rwSpiCallback(SpiComIF* comIf, SpiCookie *cookie, const uint8_t *sendData,
+ReturnValue_t spiCallback(SpiComIF* comIf, SpiCookie *cookie, const uint8_t *sendData,
         size_t sendLen, void* args);
 
 /**
@@ -27,4 +40,5 @@ ReturnValue_t rwSpiCallback(SpiComIF* comIf, SpiCookie *cookie, const uint8_t *s
  */
 void closeSpi(gpioId_t gpioId, GpioIF* gpioIF, MutexIF* mutex);
 
+}
 #endif /* BSP_Q7S_RW_SPI_CALLBACK_H_ */