PRU.h

#pragma once

#include <stdint.h>
#include "Bela.h"
#include "Gpio.h"
#include "PruManager.h"
struct McaspRegisters;

typedef struct _InternalBelaContext {
        float *audioIn;

        float *audioOut;

        float *analogIn;

        float *analogOut;

        uint32_t *digital;

        uint32_t audioFrames;
        uint32_t audioInChannels;
        uint32_t audioOutChannels;
        float audioSampleRate;

        uint32_t analogFrames;

        uint32_t analogInChannels;

        uint32_t analogOutChannels;

        float analogSampleRate;

        uint32_t digitalFrames;
        uint32_t digitalChannels;
        float digitalSampleRate;

        uint64_t audioFramesElapsed;

        uint32_t multiplexerChannels;

        uint32_t multiplexerStartingChannel;

        float *multiplexerAnalogIn;

        uint32_t audioExpanderEnabled;

        uint32_t flags;

        char projectName[MAX_PROJECTNAME_LENGTH];

        unsigned int underrunCount;
        operator BelaContext () {return *(BelaContext*)this;}
} InternalBelaContext;

class PruMemory;
class PRU
{
private:
        static const unsigned int kPruGPIODACSyncPin;
        static const unsigned int kPruGPIOADCSyncPin;

public:
        // Constructor
        PRU(InternalBelaContext *input_context);

        // Destructor
        ~PRU();

        // Prepare the GPIO pins needed for the PRU
        int prepareGPIO(int include_led);

        // Clean up the GPIO at the end
        void cleanupGPIO();

        // Initialise and open the PRU
        int initialise(BelaHw newBelaHw, int pru_num, bool uniformSampleRate,
                                   int mux_channels,
                                   int stopButtonPin, bool enableLed);

        // Run the code image in pru_rtaudio_bin.h
        int start(char * const filename, const McaspRegisters& mcaspRegisters);

        // Loop: read and write data from the PRU and call the user-defined audio callback
        void loop(void *userData, void(*render)(BelaContext*, void*), bool highPerformanceMode, BelaCpuData* cpuData);

        // Wait for an interrupt from the PRU indicate it is finished
        void waitForFinish();

        // Turn off the PRU when done
        void disable();

        // Exit the whole PRU subsystem
        void exitPRUSS();
        PruManager *pruManager;

private:
        void initialisePruCommon(const McaspRegisters& mcaspRegisters);
        int testPruError();
        InternalBelaContext *context;   // Overall settings

        int pru_number;         // Which PRU we use
        bool initialised;       // Whether the prussdrv system is initialised
        bool running;           // Whether the PRU is running
        bool analog_enabled;  // Whether SPI ADC and DAC are used
        bool digital_enabled; // Whether digital is used
        float analogs_per_audio; // How many analog frames per each audio frame
        bool uniform_sample_rate; // Should the sampling rate of the analog and audio forced to be the same, as far as ARM is concerned
        int hardware_analog_frames; // The actual number of frames for the analog channels, as far as the PRU is concerned
        bool gpio_enabled;      // Whether GPIO has been prepared
        bool led_enabled;       // Whether a user LED is enabled
        bool analog_out_is_audio;
        size_t pru_audio_out_channels;

        PruMemory* pruMemory;
        volatile uint32_t *pru_buffer_comm;
        uint32_t pruBufferMcaspFrames;

        float *last_analog_out_frame;
        uint32_t *last_digital_buffer;
        float *audio_expander_input_history;
        float *audio_expander_output_history;
        float audio_expander_filter_coeff;
        bool pruUsesMcaspIrq;
        BelaHw belaHw;

        Gpio stopButton; // Monitoring the bela cape button
        Gpio underrunLed; // Flashing an LED upon underrun
        Gpio adcNrstPin; // Resetting the ADC on Bela Mini Rev C
};