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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | ingob | 1 | /*############################################################################ |
| 2 | ############################################################################*/ |
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| 3 | |||
| 4 | #include "main.h" |
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| 5 | |||
| 918 | hbuss | 6 | volatile unsigned char twi_state = 0; |
| 1 | ingob | 7 | unsigned char motor = 0; |
| 1210 | hbuss | 8 | unsigned char motorread = 0,MissingMotor = 0; |
| 1209 | hbuss | 9 | unsigned char motor_rx[16],motor_rx2[16]; |
| 1210 | hbuss | 10 | unsigned char MotorPresent[MAX_MOTORS]; |
| 1211 | hbuss | 11 | unsigned char MotorError[MAX_MOTORS]; |
| 1 | ingob | 12 | |
| 13 | //############################################################################ |
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| 14 | //Initzialisieren der I2C (TWI) Schnittstelle |
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| 15 | void i2c_init(void) |
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| 16 | //############################################################################ |
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| 17 | { |
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| 18 | TWSR = 0; |
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| 19 | TWBR = ((SYSCLK/SCL_CLOCK)-16)/2; |
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| 20 | } |
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| 21 | |||
| 22 | //############################################################################ |
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| 23 | //Start I2C |
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| 1209 | hbuss | 24 | void i2c_start(void) |
| 1 | ingob | 25 | //############################################################################ |
| 26 | { |
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| 27 | TWCR = (1<<TWSTA) | (1<<TWEN) | (1<<TWINT) | (1<<TWIE); |
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| 28 | } |
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| 29 | |||
| 30 | //############################################################################ |
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| 31 | void i2c_stop(void) |
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| 32 | //############################################################################ |
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| 33 | { |
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| 34 | TWCR = (1<<TWEN) | (1<<TWSTO) | (1<<TWINT); |
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| 35 | } |
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| 36 | |||
| 173 | holgerb | 37 | void i2c_reset(void) |
| 1 | ingob | 38 | //############################################################################ |
| 173 | holgerb | 39 | { |
| 40 | i2c_stop(); |
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| 41 | twi_state = 0; |
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| 42 | motor = TWDR; |
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| 43 | motor = 0; |
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| 44 | TWCR = 0x80; |
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| 45 | TWAMR = 0; |
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| 46 | TWAR = 0; |
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| 47 | TWDR = 0; |
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| 48 | TWSR = 0; |
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| 49 | TWBR = 0; |
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| 50 | i2c_init(); |
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| 51 | i2c_start(); |
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| 52 | i2c_write_byte(0); |
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| 53 | } |
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| 54 | |||
| 55 | //############################################################################ |
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| 1209 | hbuss | 56 | void i2c_write_byte(char byte) |
| 1 | ingob | 57 | //############################################################################ |
| 58 | { |
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| 59 | TWSR = 0x00; |
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| 60 | TWDR = byte; |
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| 61 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE); |
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| 62 | } |
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| 63 | |||
| 1209 | hbuss | 64 | /****************************************/ |
| 65 | /* Write to I2C */ |
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| 66 | /****************************************/ |
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| 67 | void I2C_WriteByte(int8_t byte) |
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| 68 | { |
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| 69 | // move byte to send into TWI Data Register |
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| 70 | TWDR = byte; |
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| 71 | // clear interrupt flag (TWINT = 1) |
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| 72 | // enable i2c bus (TWEN = 1) |
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| 73 | // enable interrupt (TWIE = 1) |
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| 74 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE); |
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| 75 | } |
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| 76 | |||
| 77 | /****************************************/ |
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| 78 | /* Receive byte and send ACK */ |
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| 79 | /****************************************/ |
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| 80 | void I2C_ReceiveByte(void) |
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| 81 | { |
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| 82 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE) | (1<<TWEA); |
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| 83 | } |
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| 84 | |||
| 85 | /****************************************/ |
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| 86 | /* I2C receive last byte and send no ACK*/ |
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| 87 | /****************************************/ |
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| 88 | void I2C_ReceiveLastByte(void) |
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| 89 | { |
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| 90 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE); |
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| 91 | } |
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| 92 | |||
| 93 | |||
| 94 | |||
| 1 | ingob | 95 | //############################################################################ |
| 96 | SIGNAL (TWI_vect) |
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| 97 | //############################################################################ |
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| 98 | { |
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| 1211 | hbuss | 99 | static unsigned char missing_motor; |
| 1210 | hbuss | 100 | switch(twi_state++) |
| 1 | ingob | 101 | { |
| 1210 | hbuss | 102 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 103 | // Writing the Data |
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| 104 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 1 | ingob | 105 | case 0: |
| 1210 | hbuss | 106 | while(Mixer.Motor[motor][0] <= 0 && motor < MAX_MOTORS) motor++; // skip if not used |
| 107 | if(motor == MAX_MOTORS) // writing finished -> now read |
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| 108 | { |
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| 109 | motor = 0; |
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| 110 | twi_state = 3; |
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| 111 | i2c_write_byte(0x53+(motorread*2)); |
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| 112 | } |
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| 1209 | hbuss | 113 | else i2c_write_byte(0x52+(motor*2)); |
| 1 | ingob | 114 | break; |
| 115 | case 1: |
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| 1209 | hbuss | 116 | i2c_write_byte(Motor[motor++]); |
| 1111 | hbuss | 117 | break; |
| 118 | case 2: |
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| 1211 | hbuss | 119 | if(TWSR == 0x30) { if(!missing_motor) missing_motor = motor; if(++MotorError[motor-1] == 0) MotorError[motor-1] = 255;} |
| 1111 | hbuss | 120 | i2c_stop(); |
| 1210 | hbuss | 121 | I2CTimeout = 10; |
| 1209 | hbuss | 122 | twi_state = 0; |
| 1111 | hbuss | 123 | i2c_start(); |
| 124 | break; |
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| 1210 | hbuss | 125 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 126 | // Reading Data |
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| 127 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 1111 | hbuss | 128 | case 3: |
| 1211 | hbuss | 129 | //Transmit 1st byte for reading |
| 1210 | hbuss | 130 | if(TWSR != 0x40) // Error? |
| 1211 | hbuss | 131 | { |
| 132 | MotorPresent[motorread] = 0; |
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| 133 | motorread++; |
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| 134 | if(motorread >= MAX_MOTORS) motorread = 0; |
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| 135 | i2c_stop(); |
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| 1210 | hbuss | 136 | twi_state = 0; |
| 137 | } |
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| 1211 | hbuss | 138 | else |
| 139 | { |
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| 1210 | hbuss | 140 | MotorPresent[motorread] = ('1' - '-') + motorread; |
| 1211 | hbuss | 141 | I2C_ReceiveByte(); |
| 142 | } |
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| 1210 | hbuss | 143 | MissingMotor = missing_motor; |
| 1211 | hbuss | 144 | missing_motor = 0; |
| 1111 | hbuss | 145 | break; |
| 1210 | hbuss | 146 | case 4: //Read 1st byte and transmit 2nd Byte |
| 1111 | hbuss | 147 | motor_rx[motorread] = TWDR; |
| 1209 | hbuss | 148 | I2C_ReceiveLastByte(); //nack |
| 149 | break; |
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| 1210 | hbuss | 150 | case 5: |
| 1209 | hbuss | 151 | //Read 2nd byte |
| 152 | motor_rx2[motorread++] = TWDR; |
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| 1211 | hbuss | 153 | if(motorread >= MAX_MOTORS) motorread = 0; |
| 1111 | hbuss | 154 | i2c_stop(); |
| 1209 | hbuss | 155 | twi_state = 0; |
| 1111 | hbuss | 156 | break; |
| 1211 | hbuss | 157 | |
| 1210 | hbuss | 158 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 159 | // writing Gyro-Offset |
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| 160 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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| 161 | case 8: |
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| 1111 | hbuss | 162 | i2c_write_byte(0x98); // Address of the DAC |
| 163 | break; |
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| 164 | case 9: |
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| 165 | i2c_write_byte(0x10); // Update Channel A |
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| 166 | break; |
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| 167 | case 10: |
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| 168 | i2c_write_byte(AnalogOffsetNick); // Value |
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| 169 | break; |
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| 170 | case 11: |
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| 171 | i2c_write_byte(0x80); // Value |
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| 172 | break; |
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| 173 | case 12: |
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| 174 | i2c_stop(); |
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| 175 | I2CTimeout = 10; |
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| 176 | i2c_start(); |
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| 177 | break; |
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| 178 | case 13: |
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| 179 | i2c_write_byte(0x98); // Address of the DAC |
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| 180 | break; |
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| 181 | case 14: |
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| 182 | i2c_write_byte(0x12); // Update Channel B |
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| 183 | break; |
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| 184 | case 15: |
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| 185 | i2c_write_byte(AnalogOffsetRoll); // Value |
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| 186 | break; |
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| 187 | case 16: |
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| 188 | i2c_write_byte(0x80); // Value |
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| 189 | break; |
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| 190 | case 17: |
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| 191 | i2c_stop(); |
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| 192 | I2CTimeout = 10; |
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| 193 | i2c_start(); |
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| 194 | break; |
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| 195 | case 18: |
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| 196 | i2c_write_byte(0x98); // Address of the DAC |
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| 197 | break; |
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| 198 | case 19: |
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| 199 | i2c_write_byte(0x14); // Update Channel C |
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| 200 | break; |
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| 201 | case 20: |
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| 202 | i2c_write_byte(AnalogOffsetGier); // Value |
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| 203 | break; |
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| 204 | case 21: |
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| 205 | i2c_write_byte(0x80); // Value |
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| 206 | break; |
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| 207 | case 22: |
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| 208 | i2c_stop(); |
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| 209 | I2CTimeout = 10; |
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| 210 | twi_state = 0; |
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| 211 | break; |
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| 1209 | hbuss | 212 | default: twi_state = 0; |
| 213 | break; |
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| 214 | } |
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| 1111 | hbuss | 215 | TWCR |= 0x80; |
| 216 | } |