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// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Copyright (c) Holger Buss, Ingo Busker
// + Nur für den privaten Gebrauch
// + www.MikroKopter.com
// + porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation),
// + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist.
// + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt
// + bzgl. der Nutzungsbedingungen aufzunehmen.
// + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen,
// + Verkauf von Luftbildaufnahmen, usw.
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht,
// + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts
// + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de"
// + eindeutig als Ursprung verlinkt werden
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion
// + Benutzung auf eigene Gefahr
// + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Die Portierung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur
// + mit unserer Zustimmung zulässig
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// + Redistributions of source code (with or without modifications) must retain the above copyright notice,
// + this list of conditions and the following disclaimer.
// + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived
// + from this software without specific prior written permission.
// + * The use of this project (hardware, software, binary files, sources and documentation) is only permittet
// + for non-commercial use (directly or indirectly)
// + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted
// + with our written permission
// + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be
// + clearly linked as origin
// + * porting to systems other than hardware from www.mikrokopter.de is not allowed
// + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN// + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// + POSSIBILITY OF SUCH DAMAGE.
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/twi.h>
#include "eeprom.h"
#include "twimaster.h"
#include "fc.h"
#include "analog.h"
#include "uart.h"
#include "timer0.h"
volatile uint8_t twi_state = TWI_STATE_MOTOR_TX;
volatile uint8_t dac_channel = 0;
volatile uint8_t motor_write = 0;
volatile uint8_t motor_read = 0;
volatile uint16_t I2CTimeout = 100;
uint8_t MissingMotor = 0;
volatile uint8_t BLFlags = 0;
MotorData_t Motor[MAX_MOTORS];
// bit mask for witch BL the configuration should be sent
volatile uint16_t BLConfig_WriteMask = 0;
// bit mask for witch BL the configuration should be read
volatile uint16_t BLConfig_ReadMask = 0;
// buffer for BL Configuration
BLConfig_t BLConfig;
#define I2C_WriteByte(byte) {TWDR = byte; TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE);}
#define I2C_ReceiveByte() {TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE) | (1<<TWEA);}
#define I2C_ReceiveLastByte() {TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE);}
#define SCL_CLOCK 200000L
#define I2C_TIMEOUT 30000
#define TWI_BASE_ADDRESS 0x52
/**************************************************/
/* Initialize I2C (TWI) */
/**************************************************/
void I2C_Init(void)
{
uint8_t i;
uint8_t sreg = SREG;
cli();
// SDA is INPUT
DDRC &= ~(1<<DDC1);
// SCL is output
DDRC |= (1<<DDC0);
// pull up SDA
PORTC |= (1<<PORTC0)|(1<<PORTC1);
// TWI Status Register
// prescaler 1 (TWPS1 = 0, TWPS0 = 0)
TWSR &= ~((1<<TWPS1)|(1<<TWPS0));
// set TWI Bit Rate Register
TWBR = ((F_CPU/SCL_CLOCK)-16)/2;
twi_state = TWI_STATE_MOTOR_TX;
motor_write = 0;
motor_read = 0;
for(i=0; i < MAX_MOTORS; i++)
{
Motor[i].Version = 0;
Motor[i].SetPoint = 0;
Motor[i].SetPointLowerBits = 0;
Motor[i].State = 0;
Motor[i].ReadMode = BL_READMODE_STATUS;
Motor[i].Current = 0;
Motor[i].MaxPWM = 0;
Motor[i].Temperature = 0;
}
SREG = sreg;
}
void I2C_Reset(void)
{
// stop i2c bus
I2C_Stop(TWI_STATE_MOTOR_TX);
motor_write = 0;
motor_read = 0;
TWCR = (1<<TWINT); // reset to original state incl. interrupt flag reset
TWAMR = 0;
TWAR = 0;
TWDR = 0;
TWSR = 0;
TWBR = 0;
I2C_Init();
I2C_WriteByte(0);
BLFlags |= BLFLAG_READ_VERSION;
}
/****************************************/
/* I2C ISR */
/****************************************/
ISR (TWI_vect)
{
static uint8_t missing_motor = 0, motor_read_temperature = 0;
static uint8_t *pBuff = 0;
static uint8_t BuffLen = 0;
switch (twi_state++)
{
// Master Transmit
case 0: // TWI_STATE_MOTOR_TX
// skip motor if not used in mixer
while((Mixer.Motor[motor_write][MIX_GAS] <= 0) && (motor_write < MAX_MOTORS)) motor_write++;
if(motor_write >= MAX_MOTORS) // writing finished, read now
{
BLConfig_WriteMask = 0; // reset configuration bitmask
motor_write = 0; // reset motor write counter for next cycle
twi_state = TWI_STATE_MOTOR_RX;
I2C_WriteByte(TWI_BASE_ADDRESS + TW_READ + (motor_read<<1) ); // select slave address in rx mode
}
else I2C_WriteByte(TWI_BASE_ADDRESS + TW_WRITE + (motor_write<<1) ); // select slave address in tx mode
break;
case 1: // Send Data to Slave
I2C_WriteByte(Motor[motor_write].SetPoint); // transmit setpoint
// if old version has been detected
if(!(Motor[motor_write].Version & MOTOR_STATE_NEW_PROTOCOL_MASK))
{
twi_state = 4; //jump over sending more data
}
// the new version has been detected
else if(!( (Motor[motor_write].SetPointLowerBits && (RequiredMotors < 7)) || BLConfig_WriteMask || BLConfig_ReadMask ) )
{ // or LowerBits are zero and no BlConfig should be sent (saves round trip time)
twi_state = 4; //jump over sending more data
}
break;
case 2: // lower bits of setpoint (higher resolution)
if ((0x0001<<motor_write) & BLConfig_ReadMask)
{
Motor[motor_write].ReadMode = BL_READMODE_CONFIG; // configuration request
}
else
{
Motor[motor_write].ReadMode = BL_READMODE_STATUS; // normal status request
}
// send read mode and the lower bits of setpoint
I2C_WriteByte((Motor[motor_write].ReadMode<<3)|(Motor[motor_write].SetPointLowerBits & 0x07));
// configuration tranmission request?
if((0x0001<<motor_write) & BLConfig_WriteMask)
{ // redirect tx pointer to configuration data
pBuff = (uint8_t*)&BLConfig; // select config for motor
BuffLen = sizeof(BLConfig_t);
}
else
{ // jump to end of transmission for that motor
twi_state = 4;
}
break;
case 3: // send configuration
I2C_WriteByte(*pBuff);
pBuff++;
if(--BuffLen > 0) twi_state = 3; // if there are some bytes left
break;
case 4: // repeat case 0-4 for all motors
if(TWSR == TW_MT_DATA_NACK) // Data transmitted, NACK received
{
if(!missing_motor) missing_motor = motor_write + 1;
if((Motor[motor_write].State & MOTOR_STATE_ERROR_MASK) < MOTOR_STATE_ERROR_MASK) Motor[motor_write].State++; // increment error counter and handle overflow
}
I2C_Stop(TWI_STATE_MOTOR_TX);
I2CTimeout = 10;
motor_write++; // next motor
I2C_Start(TWI_STATE_MOTOR_TX); // Repeated start -> switch slave or switch Master Transmit -> Master Receive
break;
// Master Receive Data
case 5: // TWI_STATE_MOTOR_RX
if(TWSR != TW_MR_SLA_ACK) // SLA+R transmitted but no ACK received
{ // no response from the addressed slave received
Motor[motor_read].State &= ~MOTOR_STATE_PRESENT_MASK; // clear present bit
if(++motor_read >= MAX_MOTORS)
{ // all motors read
motor_read = 0; // restart from beginning
BLConfig_ReadMask = 0; // reset read configuration bitmask
if(++motor_read_temperature >= MAX_MOTORS)
{
motor_read_temperature = 0;
BLFlags &= ~BLFLAG_READ_VERSION;
}
}
BLFlags |= BLFLAG_TX_COMPLETE;
I2C_Stop(TWI_STATE_MOTOR_TX);
}
else
{ // motor successfully addressed
Motor[motor_read].State |= MOTOR_STATE_PRESENT_MASK; // set present bit
if(Motor[motor_read].Version & MOTOR_STATE_NEW_PROTOCOL_MASK)
{
// new BL found
switch(Motor[motor_read].ReadMode)
{
case BL_READMODE_CONFIG:
pBuff = (uint8_t*)&BLConfig;
BuffLen = sizeof(BLConfig_t);
break;
case BL_READMODE_STATUS:
pBuff = (uint8_t*)&(Motor[motor_read].Current);
if(motor_read == motor_read_temperature) BuffLen = 3; // read Current, MaxPwm & Temp
else BuffLen = 1;// read Current only
break;
}
}
else // old BL version
{
pBuff = (uint8_t*)&(Motor[motor_read].Current);
if((BLFlags & BLFLAG_READ_VERSION) || (motor_read == motor_read_temperature)) BuffLen = 2; // Current & MaxPwm
else BuffLen = 1; // read Current only
}
if(BuffLen == 1)
{
I2C_ReceiveLastByte(); // read last byte
}
else
{
I2C_ReceiveByte(); // read next byte
}
}
MissingMotor = missing_motor;
missing_motor = 0;
break;
case 6: // receive bytes
*pBuff = TWDR;
pBuff++;
BuffLen--;
if(BuffLen>1)
{
I2C_ReceiveByte(); // read next byte
}
else if (BuffLen == 1)
{
I2C_ReceiveLastByte(); // read last byte
}
else // nothing left
{
if(BLFlags & BLFLAG_READ_VERSION)
{
if(!(FCFlags & FCFLAG_MOTOR_RUN) && (Motor[motor_read].MaxPWM == 250) ) Motor[motor_read].Version |= MOTOR_STATE_NEW_PROTOCOL_MASK;
else Motor[motor_read].Version = 0;
}
if(++motor_read >= MAX_MOTORS)
{
motor_read = 0; // restart from beginning
BLConfig_ReadMask = 0; // reset read configuration bitmask
if(++motor_read_temperature >= MAX_MOTORS)
{
motor_read_temperature = 0;
BLFlags &= ~BLFLAG_READ_VERSION;
}
}
I2C_Stop(TWI_STATE_MOTOR_TX);
BLFlags |= BLFLAG_TX_COMPLETE;
return;
}
twi_state = 6; // if there are some bytes left
break;
// writing Gyro-Offsets
case 18:
I2C_WriteByte(0x98); // Address the DAC
break;
case 19:
I2C_WriteByte(0x10 + (dac_channel * 2)); // Select DAC Channel (0x10 = A, 0x12 = B, 0x14 = C)
break;
case 20:
switch(dac_channel)
{
case 0:
I2C_WriteByte(AnalogOffsetNick); // 1st byte for Channel A
break;
case 1:
I2C_WriteByte(AnalogOffsetRoll); // 1st byte for Channel B
break;
case 2:
I2C_WriteByte(AnalogOffsetGier); // 1st byte for Channel C
break;
}
break;
case 21:
I2C_WriteByte(0x80); // 2nd byte for all channels is 0x80
break;
case 22:
I2C_Stop(TWI_STATE_MOTOR_TX);
I2CTimeout = 10;
// repeat case 18...22 until all DAC Channels are updated
if(dac_channel < 2)
{
dac_channel ++; // jump to next channel
I2C_Start(TWI_STATE_GYRO_OFFSET_TX); // start transmission for next channel
}
else
{
dac_channel = 0; // reset dac channel counter
BLFlags |= BLFLAG_TX_COMPLETE;
}
break;
default:
I2C_Stop(TWI_STATE_MOTOR_TX);
BLFlags |= BLFLAG_TX_COMPLETE;
I2CTimeout = 10;
motor_write = 0;
motor_read = 0;
break;
}
}
uint8_t I2C_WriteBLConfig(uint8_t motor)
{
uint8_t i;
uint16_t timer;
if(MotorenEin || PC_MotortestActive) return(BLCONFIG_ERR_MOTOR_RUNNING); // not when motors are running!
if(motor > MAX_MOTORS) return (BLCONFIG_ERR_MOTOR_NOT_EXIST); // motor does not exist!
if(motor)
{
if(!(Motor[motor-1].State & MOTOR_STATE_PRESENT_MASK)) return(BLCONFIG_ERR_MOTOR_NOT_EXIST); // motor does not exist!
if(!(Motor[motor-1].Version & MOTOR_STATE_NEW_PROTOCOL_MASK)) return(BLCONFIG_ERR_HW_NOT_COMPATIBLE); // not a new BL!
}
// check BL configuration to send
if(BLConfig.Revision != BLCONFIG_REVISION) return (BLCONFIG_ERR_SW_NOT_COMPATIBLE); // bad revison
i = RAM_Checksum((uint8_t*)&BLConfig, sizeof(BLConfig_t) - 1);
if(i != BLConfig.crc) return(BLCONFIG_ERR_CHECKSUM); // bad checksum
timer = SetDelay(2000);
while(!(BLFlags & BLFLAG_TX_COMPLETE) && !CheckDelay(timer)); //wait for complete transfer
// prepare the bitmask
if(!motor) // 0 means all
{
BLConfig_WriteMask = 0xFF; // all motors at once with the same configuration
}
else //only one specific motor
{
BLConfig_WriteMask = 0x0001<<(motor-1);
}
for(i = 0; i < MAX_MOTORS; i++)
{
if((0x0001<<i) & BLConfig_WriteMask)
{
Motor[i].SetPoint = 0;
Motor[i].SetPointLowerBits = 0;
}
}
motor_write = 0;
// needs at least MAX_MOTORS loops of 2 ms (12*2ms = 24ms)
do
{
I2C_Start(TWI_STATE_MOTOR_TX); // start an i2c transmission
while(!(BLFlags & BLFLAG_TX_COMPLETE) && !CheckDelay(timer)); //wait for complete transfer
}while(BLConfig_WriteMask && !CheckDelay(timer)); // repeat until the BL config has been sent
if(BLConfig_WriteMask) return(BLCONFIG_ERR_MOTOR_NOT_EXIST);
return(BLCONFIG_SUCCESS);
}
uint8_t I2C_ReadBLConfig(uint8_t motor)
{
uint8_t i;
uint16_t timer;
if(MotorenEin || PC_MotortestActive) return(BLCONFIG_ERR_MOTOR_RUNNING); // not when motors are running!
if(motor > MAX_MOTORS) return (BLCONFIG_ERR_MOTOR_NOT_EXIST); // motor does not exist!
if(motor == 0) return (BLCONFIG_ERR_READ_NOT_POSSIBLE);
if(!(Motor[motor-1].State & MOTOR_STATE_PRESENT_MASK)) return(BLCONFIG_ERR_MOTOR_NOT_EXIST); // motor does not exist!
if(!(Motor[motor-1].Version & MOTOR_STATE_NEW_PROTOCOL_MASK)) return(BLCONFIG_ERR_HW_NOT_COMPATIBLE); // not a new BL!
timer = SetDelay(2000);
while(!(BLFlags & BLFLAG_TX_COMPLETE) && !CheckDelay(timer)); //wait for complete transfer
// prepare the bitmask
BLConfig_ReadMask = 0x0001<<(motor-1);
for(i = 0; i < MAX_MOTORS; i++)
{
if((0x0001<<i) & BLConfig_ReadMask)
{
Motor[i].SetPoint = 0;
Motor[i].SetPointLowerBits = 0;
}
}
motor_read = 0;
BLConfig.Revision = 0; // bad revision
BLConfig.crc = 0; // bad checksum
// needs at least MAX_MOTORS loops of 2 ms (12*2ms = 24ms)
do
{
I2C_Start(TWI_STATE_MOTOR_TX); // start an i2c transmission
while(!(BLFlags & BLFLAG_TX_COMPLETE) && !CheckDelay(timer)); //wait for complete transfer
}while(BLConfig_ReadMask && !CheckDelay(timer)); // repeat until the BL config has been received from all motors
// validate result
if(BLConfig.Revision != BLCONFIG_REVISION) return (BLCONFIG_ERR_SW_NOT_COMPATIBLE); // bad revison
i = RAM_Checksum((uint8_t*)&BLConfig, sizeof(BLConfig_t) - 1);
if(i != BLConfig.crc) return(BLCONFIG_ERR_CHECKSUM); // bad checksum
return(BLCONFIG_SUCCESS);
}