Subversion Repositories FlightCtrl

// ######################## SPI - FlightCtrl ###################

#include <avr/io.h>

#include <avr/interrupt.h>

#include <string.h>

#include <stdlib.h>

#include "_Settings.h"

#include "spi.h"

#include "fc.h"

#include "rc.h"

#include "eeprom.h"

#include "uart.h"

#include "timer0.h"

#include "analog.h"

#define SPI_TXSYNCBYTE1 0xAA

#define SPI_TXSYNCBYTE2 0x83

#define SPI_RXSYNCBYTE1 0x81

#define SPI_RXSYNCBYTE2 0x55

typedef enum

{

        SPI_SYNC1,

        SPI_SYNC2,

        SPI_DATA

} SPI_RXState_t;

// data exchange packets to and From NaviCtrl

ToNaviCtrl_t    ToNaviCtrl;

FromNaviCtrl_t  FromNaviCtrl;

// rx packet buffer

#define SPI_RXBUFFER_LEN sizeof(FromNaviCtrl)

uint8_t SPI_RxBuffer[SPI_RXBUFFER_LEN];

uint8_t SPI_RxBufferIndex = 0;

uint8_t SPI_RxBuffer_Request = 0;

// tx packet buffer

#define SPI_TXBUFFER_LEN sizeof(ToNaviCtrl)

uint8_t *SPI_TxBuffer;

uint8_t SPI_TxBufferIndex = 0;

uint8_t SPITransferCompleted, SPI_ChkSum;

uint8_t SPI_RxDataValid;

uint8_t SPI_CommandSequence[] = { SPI_CMD_USER, SPI_CMD_STICK, SPI_CMD_PARAMETER1, SPI_CMD_STICK, SPI_CMD_CAL_COMPASS };

uint8_t SPI_CommandCounter = 0;

/*********************************************/

/*  Initialize SPI interface to NaviCtrl     */

/*********************************************/

void SPI_MasterInit(void)

{

        DDR_SPI |= (1<<DD_MOSI)|(1<<DD_SCK);    // Set MOSI and SCK output, all others input

        SLAVE_SELECT_DDR_PORT |= (1 << SPI_SLAVE_SELECT); // set Slave select port as output port

        SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(0<<SPR0)|(0<<SPIE);   // Enable SPI, Master, set clock rate fck/64

        SPSR = 0;//(1<<SPI2X);

        SLAVE_SELECT_PORT |=  (1 << SPI_SLAVE_SELECT); // Deselect Slave

        SPI_TxBuffer = (uint8_t *) &ToNaviCtrl; // set pointer to tx-buffer

        SPITransferCompleted = 1;

        // initialize data packet to NaviControl

        ToNaviCtrl.Sync1 = SPI_TXSYNCBYTE1;

        ToNaviCtrl.Sync2 = SPI_TXSYNCBYTE2;

        ToNaviCtrl.Command = SPI_CMD_USER;

        ToNaviCtrl.IntegralNick = 0;

        ToNaviCtrl.IntegralRoll = 0;

        SPI_RxDataValid = 0;

}

/**********************************************************/

/*  Update Data transferd by the SPI from/to NaviCtrl     */

/**********************************************************/

void UpdateSPI_Buffer(void)

{

        int16_t tmp;

        cli(); // stop all interrupts to avoid writing of new data during update of that packet.

        // update content of packet to NaviCtrl

        ToNaviCtrl.IntegralNick = (int16_t) (IntegralNick / 108);

        ToNaviCtrl.IntegralRoll  = (int16_t) (IntegralRoll  / 108);

        ToNaviCtrl.GyroHeading = YawGyroHeading / YAW_GYRO_DEG_FACTOR;

        ToNaviCtrl.GyroNick = Reading_GyroNick;

        ToNaviCtrl.GyroRoll = Reading_GyroRoll;

        ToNaviCtrl.GyroYaw = Reading_GyroYaw;

        ToNaviCtrl.AccNick = (int16_t) ACC_AMPLIFY * (NaviAccNick / NaviCntAcc);

        ToNaviCtrl.AccRoll =  (int16_t) ACC_AMPLIFY * (NaviAccRoll / NaviCntAcc);

        NaviCntAcc = 0; NaviAccNick = 0; NaviAccRoll = 0;

        switch(ToNaviCtrl.Command)

        {

                case SPI_CMD_USER:

                        ToNaviCtrl.Param.Byte[0] = FCParam.UserParam1;

                        ToNaviCtrl.Param.Byte[1] = FCParam.UserParam2;

                        ToNaviCtrl.Param.Byte[2] = FCParam.UserParam3;

                        ToNaviCtrl.Param.Byte[3] = FCParam.UserParam4;

                        ToNaviCtrl.Param.Byte[4] = FCParam.UserParam5;

                        ToNaviCtrl.Param.Byte[5] = FCParam.UserParam6;

                        ToNaviCtrl.Param.Byte[6] = FCParam.UserParam7;

                        ToNaviCtrl.Param.Byte[7] = FCParam.UserParam8;

                        ToNaviCtrl.Param.Byte[8] = MKFlags;

                        MKFlags &= ~(MKFLAG_CALIBRATE | MKFLAG_START); // calibrate and start are temporal states that are cleared immediately after transmitting

                        ToNaviCtrl.Param.Byte[9] = (uint8_t)UBat;

                        ToNaviCtrl.Param.Byte[10] = ParamSet.LowVoltageWarning;

                        ToNaviCtrl.Param.Byte[11] = GetActiveParamSet();

                        break;

                case SPI_CMD_PARAMETER1:

                        ToNaviCtrl.Param.Byte[0] = FCParam.NaviGpsModeControl;     // Parameters for the Naviboard

                        ToNaviCtrl.Param.Byte[1] = FCParam.NaviGpsGain;

                        ToNaviCtrl.Param.Byte[2] = FCParam.NaviGpsP;

                        ToNaviCtrl.Param.Byte[3] = FCParam.NaviGpsI;

                        ToNaviCtrl.Param.Byte[4] = FCParam.NaviGpsD;

                        ToNaviCtrl.Param.Byte[5] = FCParam.NaviGpsACC;

                        ToNaviCtrl.Param.Byte[6] = ParamSet.NaviGpsMinSat;

                        ToNaviCtrl.Param.Byte[7] = ParamSet.NaviStickThreshold;

                        ToNaviCtrl.Param.Byte[8] = 15; // MaxRadius

                        break;

                case SPI_CMD_STICK:

                        tmp = PPM_in[ParamSet.ChannelAssignment[CH_GAS]];  if(tmp > 127) tmp = 127; else if(tmp < -128) tmp = -128;

                        ToNaviCtrl.Param.Byte[0] = (int8_t) tmp;

                        tmp = PPM_in[ParamSet.ChannelAssignment[CH_YAW]]; if(tmp > 127) tmp = 127; else if(tmp < -128) tmp = -128;

                        ToNaviCtrl.Param.Byte[1] = (int8_t) tmp;

                        tmp = PPM_in[ParamSet.ChannelAssignment[CH_ROLL]]; if(tmp > 127) tmp = 127; else if(tmp < -128) tmp = -128;

                        ToNaviCtrl.Param.Byte[2] = (int8_t) tmp;

                        tmp = PPM_in[ParamSet.ChannelAssignment[CH_NICK]]; if(tmp > 127) tmp = 127; else if(tmp < -128) tmp = -128;

                        ToNaviCtrl.Param.Byte[3] = (int8_t) tmp;

                        ToNaviCtrl.Param.Byte[4] = (uint8_t) Poti1;

                        ToNaviCtrl.Param.Byte[5] = (uint8_t) Poti2;

                        ToNaviCtrl.Param.Byte[6] = (uint8_t) Poti3;

                        ToNaviCtrl.Param.Byte[7] = (uint8_t) Poti4;

                        ToNaviCtrl.Param.Byte[8] = (uint8_t) RC_Quality;

                        break;

                case SPI_CMD_CAL_COMPASS:

                        if(CompassCalState > 5)

                        {

                                CompassCalState = 0;

                                ToNaviCtrl.Param.Byte[0] = 5;

                        }

                        else

                        {

                                ToNaviCtrl.Param.Byte[0] = CompassCalState;

                        }

                        break;

        }

        sei(); // enable all interrupts

        // analyze content of packet from NaviCtrl if valid

        if (SPI_RxDataValid)

        {

                // update gps controls

                if(abs(FromNaviCtrl.GPS_Nick) < 512 && abs(FromNaviCtrl.GPS_Roll) < 512 && (ParamSet.GlobalConfig & CFG_GPS_ACTIVE))

                {

                        GPS_Nick        = FromNaviCtrl.GPS_Nick;

                        GPS_Roll        = FromNaviCtrl.GPS_Roll;

                }

                // update compass readings

                if(FromNaviCtrl.CompassHeading <= 360)

                {

                        CompassHeading = FromNaviCtrl.CompassHeading;

                }

                if(CompassHeading < 0) CompassOffCourse = 0;

                else CompassOffCourse = ((540 + CompassHeading - CompassCourse) % 360) - 180;

        // NaviCtrl wants to beep?

                if (FromNaviCtrl.BeepTime > BeepTime && !CompassCalState) BeepTime = FromNaviCtrl.BeepTime;

                switch (FromNaviCtrl.Command)

                {

                        case  SPI_CMD_OSD_DATA:

                                //                                FromFlightCtrl.Param.Byte[0] = OsdBar;

                                //                                FromFlightCtrl.Param.Int[1]  = Distance;

                                break;

                        case  SPI_CMD_GPS_POS:

                                //                                FromFlightCtrl.Param.Long[0]  = GPS_Data.Longitude;

                                //                                FromFlightCtrl.Param.Long[1]  = GPS_Data.Latitude;

                                break;

                        case  SPI_CMD_GPS_TARGET:

                                //                                FromFlightCtrl.Param.Long[0]  = GPS_Data.TargetLongitude;

                                //                                FromFlightCtrl.Param.Long[1]  = GPS_Data.TargetLatitude;

                                break;

                        default:

                                break;

                }

        }

        else // no valid data from NaviCtrl

        {

                // disable GPS control

                GPS_Nick = 0;

                GPS_Roll = 0;

        }

}

/*********************************************/

/*  Start Transmission of packet to NaviCtrl */

/*********************************************/

void SPI_StartTransmitPacket(void)

{

        if (!SPITransferCompleted) return; // return immediately if transfer is in progress

        else // transmission was completed

        {

                SLAVE_SELECT_PORT &=  ~(1 << SPI_SLAVE_SELECT);  // Select slave

                // cyclic commands

                ToNaviCtrl.Command = SPI_CommandSequence[SPI_CommandCounter++];

                if (SPI_CommandCounter >= sizeof(SPI_CommandSequence)) SPI_CommandCounter = 0;

                SPITransferCompleted = 0; // transfer is in progress

                UpdateSPI_Buffer();    // update data in ToNaviCtrl

                SPI_TxBufferIndex = 1; //proceed with 2nd byte

                // -- Debug-Output ---

                //----

                asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");            asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");

                asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");            asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");

                asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");            asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");

                ToNaviCtrl.Chksum = ToNaviCtrl.Sync1; // init checksum

                SPDR = ToNaviCtrl.Sync1; // send first byte

        }

}

//------------------------------------------------------

// This is the spi data transfer between FlightCtrl and NaviCtrl

// Every time this routine is called within the mainloop one byte of the packet to

// the NaviCtrl and one byte of the packet from the NaviCtrl is possible transfered

void SPI_TransmitByte(void)

{

        static SPI_RXState_t SPI_RXState = SPI_SYNC1;

        uint8_t rxdata;

        static uint8_t rxchksum;

        if (SPITransferCompleted) return;  // return immediatly if transfer was completed

        if (!(SPSR & (1 << SPIF))) return; // return if no SPI-IRQ pending

        SendSPI = 4; // mait 4 * 0.102 ms for the next call of SPI_TransmitByte() in the main loop

        SLAVE_SELECT_PORT |=  (1 << SPI_SLAVE_SELECT);   // DeselectSlave

        rxdata = SPDR; // save spi data register

        switch (SPI_RXState)

        {

                case SPI_SYNC1: // first sync byte

                        SPI_RxBufferIndex = 0; // set pointer to start of rx buffer

                        rxchksum = rxdata; // initialize checksum

                        if (rxdata == SPI_RXSYNCBYTE1 )

                        {       // 1st Syncbyte found

                                SPI_RXState  = SPI_SYNC2; // trigger to state for second sync byte

                        }

                        break;

                case SPI_SYNC2: // second sync byte

                        if (rxdata == SPI_RXSYNCBYTE2)

                        {       // 2nd Syncbyte found

                                rxchksum += rxdata; // update checksum

                                SPI_RXState  = SPI_DATA;   // trigger to state for second sync byte

                        }

                        else // 2nd Syncbyte not found

                        {

                                SPI_RXState  = SPI_SYNC1; // jump back to 1st sync byte

                        }

                        break;

                case SPI_DATA: // data bytes

                        SPI_RxBuffer[SPI_RxBufferIndex++] = rxdata;  // copy data byte to spi buffer

                        // if all bytes are received of a packet from the NaviCtrl

                        if (SPI_RxBufferIndex >= SPI_RXBUFFER_LEN)

                        {   // last byte transfered is the checksum of the packet

                                if (rxdata == rxchksum) // checksum matching?

                                {

                                        // copy SPI_RxBuffer -> FromFlightCtrl

                                        uint8_t *ptr = (uint8_t *)&FromNaviCtrl;

                                        cli();

                                        memcpy(ptr, (uint8_t *) SPI_RxBuffer, sizeof(FromNaviCtrl));

                                        sei();

                                        SPI_RxDataValid = 1;

                                        DebugOut.Analog[18]++;

                                }

                                else

                                {   // checksum does not match

                                        DebugOut.Analog[17]++;

                                        SPI_RxDataValid = 0; // reset valid flag

                                }

                                SPI_RXState  = SPI_SYNC1; // reset state sync

                        }

                        else // not all bytes transfered

                        {

                                rxchksum += rxdata; // update checksum

                        }

                        break;

        }// eof switch(SPI_RXState)

    // if still some bytes left for transmission to NaviCtrl

        if (SPI_TxBufferIndex < SPI_TXBUFFER_LEN)

        {

                SLAVE_SELECT_PORT &=  ~(1 << SPI_SLAVE_SELECT);  // SelectSlave

                asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");

                asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");

                asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop"); asm volatile ("nop");

                SPDR = SPI_TxBuffer[SPI_TxBufferIndex]; // transmit byte

                ToNaviCtrl.Chksum += SPI_TxBuffer[SPI_TxBufferIndex]; // update checksum for everey byte that was sent

                SPI_TxBufferIndex++;

        }

        else

        {

                //Transfer of all bytes of the packet to NaviCtrl completed

                SPITransferCompleted = 1;

        }

}