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1538 | killagreg | 1 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 | // + Copyright (c) Holger Buss, Ingo Busker |
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3 | // + Nur für den privaten Gebrauch |
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4 | // + www.MikroKopter.com |
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5 | // + porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
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6 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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7 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
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8 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
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9 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
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10 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
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11 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
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12 | // + Verkauf von Luftbildaufnahmen, usw. |
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13 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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14 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
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15 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
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16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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17 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
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18 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
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19 | // + eindeutig als Ursprung verlinkt werden |
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20 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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21 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
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22 | // + Benutzung auf eigene Gefahr |
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23 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
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24 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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25 | // + Die Portierung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
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26 | // + mit unserer Zustimmung zulässig |
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27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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28 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
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29 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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30 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
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31 | // + this list of conditions and the following disclaimer. |
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32 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
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33 | // + from this software without specific prior written permission. |
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34 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permittet |
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35 | // + for non-commercial use (directly or indirectly) |
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36 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
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37 | // + with our written permission |
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38 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
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39 | // + clearly linked as origin |
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40 | // + * porting to systems other than hardware from www.mikrokopter.de is not allowed |
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41 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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42 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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43 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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44 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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45 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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46 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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47 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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48 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN// + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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49 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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50 | // + POSSIBILITY OF SUCH DAMAGE. |
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51 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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52 | |||
53 | #include <avr/io.h> |
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54 | #include <avr/interrupt.h> |
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55 | #include <util/twi.h> |
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56 | #include "main.h" |
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57 | #include "eeprom.h" |
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58 | #include "twimaster.h" |
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59 | #include "fc.h" |
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60 | #include "analog.h" |
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61 | |||
62 | volatile uint8_t twi_state = TWI_STATE_MOTOR_TX; |
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63 | volatile uint8_t dac_channel = 0; |
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64 | volatile uint8_t motor_write = 0; |
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65 | volatile uint8_t motor_read = 0; |
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66 | |||
67 | volatile uint16_t I2CTimeout = 100; |
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68 | |||
69 | uint8_t MissingMotor = 0; |
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70 | |||
71 | |||
72 | MotorData_t Motor[MAX_MOTORS]; |
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73 | |||
74 | #define SCL_CLOCK 200000L |
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75 | #define I2C_TIMEOUT 30000 |
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76 | |||
77 | /**************************************************/ |
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78 | /* Initialize I2C (TWI) */ |
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79 | /**************************************************/ |
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80 | void I2C_Init(void) |
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81 | { |
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82 | uint8_t i; |
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83 | uint8_t sreg = SREG; |
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84 | cli(); |
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85 | |||
86 | // SDA is INPUT |
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87 | DDRC &= ~(1<<DDC1); |
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88 | // SCL is output |
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89 | DDRC |= (1<<DDC0); |
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90 | // pull up SDA |
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91 | PORTC |= (1<<PORTC0)|(1<<PORTC1); |
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92 | |||
93 | // TWI Status Register |
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94 | // prescaler 1 (TWPS1 = 0, TWPS0 = 0) |
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95 | TWSR &= ~((1<<TWPS1)|(1<<TWPS0)); |
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96 | |||
97 | // set TWI Bit Rate Register |
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98 | TWBR = ((SYSCLK/SCL_CLOCK)-16)/2; |
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99 | |||
100 | twi_state = TWI_STATE_MOTOR_TX; |
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101 | motor_write = 0; |
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102 | motor_read = 0; |
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103 | |||
104 | for(i=0; i < MAX_MOTORS; i++) |
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105 | { |
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106 | Motor[i].SetPoint = 0; |
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107 | Motor[i].Present = 0; |
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108 | Motor[i].Error = 0; |
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109 | Motor[i].MaxPWM = 0; |
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110 | } |
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111 | |||
112 | SREG = sreg; |
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113 | } |
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114 | |||
115 | /****************************************/ |
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116 | /* Start I2C */ |
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117 | /****************************************/ |
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118 | void I2C_Start(uint8_t start_state) |
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119 | { |
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120 | twi_state = start_state; |
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121 | // TWI Control Register |
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122 | // clear TWI interrupt flag (TWINT=1) |
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123 | // disable TWI Acknowledge Bit (TWEA = 0) |
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124 | // enable TWI START Condition Bit (TWSTA = 1), MASTER |
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125 | // disable TWI STOP Condition Bit (TWSTO = 0) |
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126 | // disable TWI Write Collision Flag (TWWC = 0) |
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127 | // enable i2c (TWEN = 1) |
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128 | // enable TWI Interrupt (TWIE = 1) |
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129 | TWCR = (1<<TWINT) | (1<<TWSTA) | (1<<TWEN) | (1<<TWIE); |
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130 | } |
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131 | |||
132 | /****************************************/ |
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133 | /* Stop I2C */ |
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134 | /****************************************/ |
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135 | void I2C_Stop(uint8_t start_state) |
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136 | { |
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137 | twi_state = start_state; |
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138 | // TWI Control Register |
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139 | // clear TWI interrupt flag (TWINT=1) |
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140 | // disable TWI Acknowledge Bit (TWEA = 0) |
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141 | // diable TWI START Condition Bit (TWSTA = 1), no MASTER |
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142 | // enable TWI STOP Condition Bit (TWSTO = 1) |
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143 | // disable TWI Write Collision Flag (TWWC = 0) |
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144 | // enable i2c (TWEN = 1) |
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145 | // disable TWI Interrupt (TWIE = 0) |
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146 | TWCR = (1<<TWINT) | (1<<TWSTO) | (1<<TWEN); |
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147 | } |
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148 | |||
149 | |||
150 | /****************************************/ |
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151 | /* Write to I2C */ |
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152 | /****************************************/ |
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153 | void I2C_WriteByte(int8_t byte) |
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154 | { |
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155 | // move byte to send into TWI Data Register |
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156 | TWDR = byte; |
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157 | // clear interrupt flag (TWINT = 1) |
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158 | // enable i2c bus (TWEN = 1) |
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159 | // enable interrupt (TWIE = 1) |
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160 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE); |
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161 | } |
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162 | |||
163 | |||
164 | /****************************************/ |
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165 | /* Receive byte and send ACK */ |
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166 | /****************************************/ |
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167 | void I2C_ReceiveByte(void) |
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168 | { |
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169 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE) | (1<<TWEA); |
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170 | } |
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171 | |||
172 | /****************************************/ |
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173 | /* I2C receive last byte and send no ACK*/ |
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174 | /****************************************/ |
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175 | void I2C_ReceiveLastByte(void) |
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176 | { |
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177 | TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE); |
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178 | } |
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179 | |||
180 | |||
181 | /****************************************/ |
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182 | /* Reset I2C */ |
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183 | /****************************************/ |
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184 | void I2C_Reset(void) |
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185 | { |
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186 | // stop i2c bus |
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187 | I2C_Stop(TWI_STATE_MOTOR_TX); |
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188 | twi_state = 0; |
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189 | motor_write = TWDR; |
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190 | motor_write = 0; |
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191 | motor_read = 0; |
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192 | TWCR = (1<<TWINT); // reset to original state incl. interrupt flag reset |
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193 | TWAMR = 0; |
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194 | TWAR = 0; |
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195 | TWDR = 0; |
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196 | TWSR = 0; |
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197 | TWBR = 0; |
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198 | I2C_Init(); |
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199 | I2C_Start(TWI_STATE_MOTOR_TX); |
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200 | } |
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201 | |||
202 | |||
203 | /****************************************/ |
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204 | /* I2C ISR */ |
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205 | /****************************************/ |
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206 | ISR (TWI_vect) |
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207 | { |
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208 | static uint8_t missing_motor = 0; |
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209 | |||
210 | switch (twi_state++) // First i2c_start from SendMotorData() |
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211 | { |
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212 | // Master Transmit |
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213 | case 0: // TWI_STATE_MOTOR_TX |
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214 | // skip motor if not used in mixer |
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215 | while((Mixer.Motor[motor_write][MIX_GAS] <= 0) && (motor_write < MAX_MOTORS)) motor_write++; |
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216 | if(motor_write >= MAX_MOTORS) // writing finished, read now |
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217 | { |
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218 | motor_write = 0; |
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219 | twi_state = TWI_STATE_MOTOR_RX; |
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220 | I2C_WriteByte(0x53 + (motor_read * 2) ); // select slave adress in rx mode |
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221 | } |
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222 | else I2C_WriteByte(0x52 + (motor_write * 2) ); // select slave adress in tx mode |
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223 | break; |
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224 | case 1: // Send Data to Slave |
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225 | I2C_WriteByte(Motor[motor_write].SetPoint); // transmit rotation rate setpoint |
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226 | break; |
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227 | case 2: // repeat case 0+1 for all motors |
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228 | if(TWSR == TW_MT_DATA_NACK) // Data transmitted, NACK received |
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229 | { |
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230 | if(!missing_motor) missing_motor = motor_write + 1; |
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231 | if(++Motor[motor_write].Error == 0) Motor[motor_write].Error = 255; // increment error counter and handle overflow |
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232 | } |
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233 | I2C_Stop(TWI_STATE_MOTOR_TX); |
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234 | I2CTimeout = 10; |
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235 | motor_write++; // next motor |
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236 | I2C_Start(TWI_STATE_MOTOR_TX); // Repeated start -> switch slave or switch Master Transmit -> Master Receive |
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237 | break; |
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238 | // Master Receive Data |
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239 | case 3: |
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240 | if(TWSR != TW_MR_SLA_ACK) // SLA+R transmitted, if not ACK received |
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241 | { // no response from the addressed slave received |
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242 | Motor[motor_read].Present = 0; |
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243 | motor_read++; // next motor |
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244 | if(motor_read >= MAX_MOTORS) motor_read = 0; // restart reading of first motor if we have reached the last one |
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245 | I2C_Stop(TWI_STATE_MOTOR_TX); |
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246 | } |
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247 | else |
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248 | { |
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249 | Motor[motor_read].Present = ('1' - '-') + motor_read; |
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250 | I2C_ReceiveByte(); //Transmit 1st byte |
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251 | } |
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252 | MissingMotor = missing_motor; |
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253 | missing_motor = 0; |
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254 | break; |
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255 | case 4: //Read 1st byte and transmit 2nd Byte |
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256 | Motor[motor_read].Current = TWDR; |
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257 | I2C_ReceiveLastByte(); // nack |
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258 | break; |
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259 | case 5: |
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260 | //Read 2nd byte |
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261 | Motor[motor_read].MaxPWM = TWDR;; |
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262 | motor_read++; // next motor |
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263 | if(motor_read >= MAX_MOTORS) motor_read = 0; // restart reading of first motor if we have reached the last one |
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264 | I2C_Stop(TWI_STATE_MOTOR_TX); |
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265 | break; |
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266 | |||
267 | // writing Gyro-Offsets |
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268 | case 7: |
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269 | I2C_WriteByte(0x98); // Address the DAC |
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270 | break; |
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271 | |||
272 | case 8: |
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273 | I2C_WriteByte(0x10 + (dac_channel * 2)); // Select DAC Channel (0x10 = A, 0x12 = B, 0x14 = C) |
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274 | break; |
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275 | |||
276 | case 9: |
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277 | switch(dac_channel) |
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278 | { |
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279 | case 0: |
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280 | I2C_WriteByte(DacOffsetGyroNick); // 1st byte for Channel A |
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281 | break; |
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282 | case 1: |
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283 | I2C_WriteByte(DacOffsetGyroRoll); // 1st byte for Channel B |
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284 | break; |
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285 | case 2: |
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286 | I2C_WriteByte(DacOffsetGyroYaw ); // 1st byte for Channel C |
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287 | break; |
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288 | } |
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289 | break; |
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290 | |||
291 | case 10: |
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292 | I2C_WriteByte(0x80); // 2nd byte for all channels is 0x80 |
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293 | break; |
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294 | |||
295 | case 11: |
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296 | I2C_Stop(TWI_STATE_MOTOR_TX); |
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297 | I2CTimeout = 10; |
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298 | // repeat case 7...10 until all DAC Channels are updated |
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299 | if(dac_channel < 2) |
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300 | { |
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301 | dac_channel ++; // jump to next channel |
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302 | I2C_Start(TWI_STATE_GYRO_OFFSET_TX); // start transmission for next channel |
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303 | } |
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304 | else |
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305 | { // data to last motor send |
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306 | dac_channel = 0; // reset dac channel counter |
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307 | } |
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308 | break; |
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309 | |||
310 | default: |
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311 | I2C_Stop(TWI_STATE_MOTOR_TX); |
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312 | I2CTimeout = 10; |
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313 | motor_write = 0; |
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314 | motor_read = 0; |
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315 | } |
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316 | } |