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Rev | Author | Line No. | Line |
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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 | } |