added spi mux functionality to the rwSpiCallback

bsp_q7s/spi/Q7sSpiComIF.cpp

@@ -0,0 +1,9 @@
+#include <bsp_q7s/spi/Q7sSpiComIF.h>
+
+Q7sSpiComIF::Q7sSpiComIF(object_id_t objectId, GpioIF* gpioComIF) :
+        SpiComIF(objectId, gpioComIF) {
+}
+
+Q7sSpiComIF::~Q7sSpiComIF() {
+}
+

bsp_q7s/spi/Q7sSpiComIF.h

@@ -0,0 +1,33 @@
+#ifndef BSP_Q7S_SPI_Q7SSPICOMIF_H_
+#define BSP_Q7S_SPI_Q7SSPICOMIF_H_
+
+#include <fsfw_hal/linux/spi/SpiComIF.h>
+
+
+/**
+ * @brief   This additional communication interface is required because the SPI busses behind the
+ *          devices "/dev/spi2.0" and "dev/spidev3.0" are multiplexed to one SPI interface.
+ *          This was necessary because the processing system spi (/dev/spi2.0) does not support
+ *          frequencies lower than 650 kHz. To reach lower frequencies also the CPU frequency must
+ *          be reduced which leads to other effects compromising kernel drivers.
+ *          The nano avionics reaction wheels require a spi frequency between 150 kHz and 300 kHz
+ *          why an additional AXI SPI core has been implemented in the programmable logic. However,
+ *          the spi frequency of the AXI SPI core is not configurable during runtime. Therefore,
+ *          this communication interface multiplexes either the hard-wired SPI or the AXI SPI to
+ *          the SPI interface. The multiplexing is performed via a GPIO connected to a VHDL
+ *          module responsible for switching between the to SPI peripherals.
+ */
+class Q7sSpiComIF: public SpiComIF {
+public:
+    /**
+     * @brief   Constructor
+     *
+     * @param objectId
+     * @param gpioComIF
+     * @param gpioSwitchId  The gpio ID of the GPIO connected to the SPI mux module in the PL.
+     */
+    Q7sSpiComIF(object_id_t objectId, GpioIF* gpioComIF, gpioId_t gpioSwitchId);
+    virtual ~Q7sSpiComIF();
+};
+
+#endif /* BSP_Q7S_SPI_Q7SSPICOMIF_H_ */