114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
#ifndef LINUX_OBC_PAPBVCINTERFACE_H_
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#define LINUX_OBC_PAPBVCINTERFACE_H_
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#include <fsfw_hal/common/gpio/gpioDefinitions.h>
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#include <fsfw_hal/linux/gpio/LinuxLibgpioIF.h>
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#include "OBSWConfig.h"
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#include "fsfw/returnvalues/returnvalue.h"
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#include "linux/obc/VcInterfaceIF.h"
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/**
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* @brief This class handles the transmission of data to a virtual channel of the PTME IP Core
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* via the PAPB interface.
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*
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* @author J. Meier
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*/
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class PapbVcInterface : public VcInterfaceIF {
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public:
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/**
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* @brief Constructor
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*
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* @param papbBusyId The ID of the GPIO which is connected to the PAPBBusy_N signal of the
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* VcInterface IP Core. A low logic level indicates the VcInterface is not
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* ready to receive more data.
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* @param papbEmptyId The ID of the GPIO which is connected to the PAPBEmpty signal of the
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* VcInterface IP Core. The signal is high when there are no packets in the
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* external buffer memory (BRAM).
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* @param uioFile UIO file providing access to the PAPB bus
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* @param mapNum Map number of UIO map associated with this virtual channel
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*/
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PapbVcInterface(LinuxLibgpioIF* gpioComIF, gpioId_t papbBusyId, gpioId_t papbEmptyId,
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std::string uioFile, int mapNum);
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virtual ~PapbVcInterface();
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ReturnValue_t write(const uint8_t* data, size_t size) override;
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ReturnValue_t initialize() override;
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private:
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static const uint8_t INTERFACE_ID = CLASS_ID::CCSDS_IP_CORE_BRIDGE;
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static const ReturnValue_t PAPB_BUSY = MAKE_RETURN_CODE(0xA0);
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/**
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* Configuration bits:
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* bit[1:0]: Size of data (1,2,3 or 4 bytes). 1 Byte <=> b00
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* bit[2]: Set this bit to 1 to abort a transfered packet
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* bit[3]: Signals to VcInterface the start of a new telemetry packet
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*/
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static const uint32_t CONFIG_START = 0x8;
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/**
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* Writing this word to the VcInterface base address signals to the virtual channel interface
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* that a complete tm packet has been transferred.
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*/
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static const uint32_t CONFIG_END = 0x0;
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/**
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* Writing to this offset within the memory space of a virtual channel will insert data for
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* encoding to the external buffer memory of the PTME IP Core.
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* The address offset is 0x400 (= 4 * 256)
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*/
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static const int DATA_REG_OFFSET = 256;
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LinuxLibgpioIF* gpioComIF = nullptr;
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/** Pulled to low when virtual channel not ready to receive data */
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gpioId_t papbBusyId = gpio::NO_GPIO;
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/** High when external buffer memory of virtual channel is empty */
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gpioId_t papbEmptyId = gpio::NO_GPIO;
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std::string uioFile;
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int mapNum = 0;
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uint32_t* vcBaseReg = nullptr;
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uint32_t vcOffset = 0;
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/**
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* @brief This function sends the config byte to the virtual channel of the PTME IP Core
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* to initiate a packet transfer.
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*/
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void startPacketTransfer();
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/**
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* @brief This function sends the config byte to the virtual channel interface of the PTME
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* IP Core to signal the end of a packet transfer.
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*/
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void endPacketTransfer();
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/**
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* @brief This function reads the papb busy signal indicating whether the virtual channel
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* interface is ready to receive more data or not. PAPB is ready when
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* PAPB_Busy_N == '1'.
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*
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* @return returnvalue::OK when ready to receive data else PAPB_BUSY.
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*/
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ReturnValue_t pollPapbBusySignal();
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/**
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* @brief This function can be used for debugging to check whether there are packets in
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* the packet buffer of the virtual channel or not.
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*/
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void isVcInterfaceBufferEmpty();
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/**
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* @brief This function sends a complete telemetry transfer frame data field (1105 bytes)
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* to the papb interface of the PTME IP Core. Can be used to test the implementation.
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*/
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ReturnValue_t sendTestFrame();
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};
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#endif /* LINUX_OBC_PAPBVCINTERFACE_H_ */
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