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1 ingob 1
/*#######################################################################################*/
2
/* !!! THIS IS NOT FREE SOFTWARE !!!                                                     */
3
/*#######################################################################################*/
4
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5
// + Copyright (c) 2008 Ingo Busker, Holger Buss
171 ingob 6
// + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY
1 ingob 7
// + FOR NON COMMERCIAL USE ONLY
8
// + www.MikroKopter.com
9
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
37 killagreg 10
// + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation),
11
// + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist.
12
// + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt
13
// + bzgl. der Nutzungsbedingungen aufzunehmen.
1 ingob 14
// + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen,
15
// + Verkauf von Luftbildaufnahmen, usw.
16
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
37 killagreg 17
// + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht,
1 ingob 18
// + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen
19
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
20
// + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts
21
// + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de"
22
// + eindeutig als Ursprung verlinkt werden
23
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
24
// + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion
25
// + Benutzung auf eigene Gefahr
26
// + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden
27
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
171 ingob 28
// + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur
1 ingob 29
// + mit unserer Zustimmung zulässig
30
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
31
// + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen
32
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
37 killagreg 33
// + Redistributions of source code (with or without modifications) must retain the above copyright notice,
1 ingob 34
// + this list of conditions and the following disclaimer.
35
// +   * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived
36
// +     from this software without specific prior written permission.
37 killagreg 37
// +   * The use of this project (hardware, software, binary files, sources and documentation) is only permitted
1 ingob 38
// +     for non-commercial use (directly or indirectly)
37 killagreg 39
// +     Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted
1 ingob 40
// +     with our written permission
37 killagreg 41
// +   * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be
42
// +     clearly linked as origin
171 ingob 43
// +   * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed
1 ingob 44
//
45
// +  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
46
// +  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47
// +  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48
// +  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
49
// +  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
50
// +  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
51
// +  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
52
// +  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
53
// +  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
54
// +  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 killagreg 55
// +  POSSIBILITY OF SUCH DAMAGE.
1 ingob 56
// ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
41 ingob 57
#include <string.h>
58
#include "91x_lib.h"
59
#include "i2c.h"
60
#include "uart1.h"
119 killagreg 61
#include "timer1.h"
136 killagreg 62
#include "config.h"
41 ingob 63
#include "led.h"
1 ingob 64
 
241 killagreg 65
volatile u8 I2C_State = I2C_STATE_OFF; // only one byte, because of sync by nesting irqs
1 ingob 66
 
41 ingob 67
// rxbuffer
68
volatile u8 I2C_RxBufferSize;
241 killagreg 69
volatile u8 I2C_RxBuffer[I2C_RXBUFFER_LEN];
41 ingob 70
// txbuffer
71
volatile u8 I2C_TxBufferSize;
241 killagreg 72
volatile u8 I2C_TxBuffer[I2C_TXBUFFER_LEN];
41 ingob 73
 
74
volatile u8 I2C_Direction;
241 killagreg 75
volatile u8 I2C_SlaveAddress = 0x00;
76
I2C_pRxHandler_t I2C_pRxHandler = NULL;
41 ingob 77
 
78
volatile u32 I2C1_Timeout = 0;
1 ingob 79
 
80
//--------------------------------------------------------------
81
void I2C1_Init(void)
82
{
41 ingob 83
        I2C_InitTypeDef   I2C_Struct;
84
        GPIO_InitTypeDef  GPIO_InitStructure;
149 killagreg 85
 
241 killagreg 86
        I2C_State = I2C_STATE_OFF;
37 killagreg 87
 
110 killagreg 88
        UART1_PutString("\r\n I2C init...");
41 ingob 89
        // enable Port 2 peripherie
90
        SCU_APBPeriphClockConfig(__GPIO2, ENABLE);
91
        // disable a reset state
92
        SCU_APBPeriphReset(__GPIO2, DISABLE);
1 ingob 93
 
41 ingob 94
        // free a busy bus
1 ingob 95
 
41 ingob 96
        // At switch on I2C devices can get in a state where they
97
        // are still waiting for a command due to all the bus lines bouncing
98
        // around at startup have started clocking data into the device(s).
99
        // Enable the ports as open collector port outputs
100
        // and clock out at least 9 SCL pulses, then generate a stop
101
        // condition and then leave the clock line high.
37 killagreg 102
 
41 ingob 103
        // configure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT to normal port operation
104
        GPIO_StructInit(&GPIO_InitStructure);
105
        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
106
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
107
        GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;
196 killagreg 108
        GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Disable;
41 ingob 109
        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt1;
110
        GPIO_Init(GPIO2, &GPIO_InitStructure);
37 killagreg 111
 
41 ingob 112
        u8 i;
113
        u32 delay;
114
        // set SCL high and then SDA to low (start condition)
115
        GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
116
        delay = SetDelay(1);
117
        while (!CheckDelay(delay));
118
        GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_RESET);
119
        // toggle SCL at least 10 times from high to low to high
120
        for(i = 0; i < 10; i++)
121
        {
122
                delay = SetDelay(1);
123
                while (!CheckDelay(delay));
1 ingob 124
 
41 ingob 125
                GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_RESET);
126
                delay = SetDelay(1);
127
                while (!CheckDelay(delay));
128
                GPIO_WriteBit(GPIO2, GPIO_Pin_2, Bit_SET);
129
        }
130
        delay = SetDelay(1);
131
        while (!CheckDelay(delay));
132
        // create stop condition setting SDA HIGH when SCL is HIGH
133
        GPIO_WriteBit(GPIO2, GPIO_Pin_3, Bit_SET);
37 killagreg 134
 
135
 
41 ingob 136
        // reconfigure P2.2->I2C1_CLKOUT and P2.3->I2C1_DOUT
137
        GPIO_StructInit(&GPIO_InitStructure);
138
        GPIO_InitStructure.GPIO_Direction = GPIO_PinOutput;
139
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
140
        GPIO_InitStructure.GPIO_Type = GPIO_Type_OpenCollector;
196 killagreg 141
        GPIO_InitStructure.GPIO_IPInputConnected = GPIO_IPInputConnected_Enable;
41 ingob 142
        GPIO_InitStructure.GPIO_Alternate = GPIO_OutputAlt2; //I2C1_CLKOUT, I2C1_DOUT
143
        GPIO_Init(GPIO2, &GPIO_InitStructure);
144
 
145
        // enable I2C peripherie
146
        SCU_APBPeriphClockConfig(__I2C1,ENABLE);
147
        // reset I2C peripherie
148
        SCU_APBPeriphReset(__I2C1,ENABLE);
149
        SCU_APBPeriphReset(__I2C1,DISABLE);
150
 
151
        I2C_DeInit(I2C1);
152
        I2C_StructInit(&I2C_Struct);
153
        I2C_Struct.I2C_GeneralCall = I2C_GeneralCall_Disable;
154
        I2C_Struct.I2C_Ack = I2C_Ack_Enable;
136 killagreg 155
        I2C_Struct.I2C_CLKSpeed = I2C1_CLOCK;
41 ingob 156
        I2C_Struct.I2C_OwnAddress = 0x00;
157
        I2C_Init(I2C1, &I2C_Struct);
158
 
241 killagreg 159
        // empty rx and tx buffer
41 ingob 160
        I2C_TxBufferSize = 0;
161
        I2C_RxBufferSize = 0;
162
 
163
        I2C_Cmd(I2C1, ENABLE);
164
        I2C_ITConfig(I2C1, ENABLE);
165
 
136 killagreg 166
        VIC_Config(I2C1_ITLine, VIC_IRQ , PRIORITY_I2C1);
41 ingob 167
 
189 killagreg 168
        I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);
41 ingob 169
        I2C_GenerateSTOP(I2C1, ENABLE);
241 killagreg 170
        I2C_State = I2C_STATE_IDLE;
41 ingob 171
 
110 killagreg 172
        UART1_PutString("ok");
1 ingob 173
}
174
 
41 ingob 175
 
1 ingob 176
//--------------------------------------------------------------
41 ingob 177
void I2C1_Deinit(void)
1 ingob 178
{
79 killagreg 179
        GPIO_InitTypeDef  GPIO_InitStructure;
110 killagreg 180
        UART1_PutString("\r\n I2C deinit...");
41 ingob 181
        I2C_GenerateStart(I2C1, DISABLE);
182
        I2C_GenerateSTOP(I2C1, ENABLE);
183
        VIC_ITCmd(I2C1_ITLine, DISABLE);
241 killagreg 184
        I2C_State = I2C_STATE_OFF;
41 ingob 185
        I2C_ITConfig(I2C1, DISABLE);
186
        I2C_Cmd(I2C1, DISABLE);
187
        I2C_DeInit(I2C1);
188
        SCU_APBPeriphClockConfig(__I2C1, DISABLE);
79 killagreg 189
 
41 ingob 190
        // set ports to input
191
        SCU_APBPeriphClockConfig(__GPIO2, ENABLE);
192
        GPIO_StructInit(&GPIO_InitStructure);
193
        GPIO_InitStructure.GPIO_Direction =     GPIO_PinInput;
79 killagreg 194
        GPIO_InitStructure.GPIO_Pin =                   GPIO_Pin_2 | GPIO_Pin_3;
195
        GPIO_InitStructure.GPIO_Type =                  GPIO_Type_PushPull;
196 killagreg 196
        GPIO_InitStructure.GPIO_IPInputConnected =      GPIO_IPInputConnected_Disable;
79 killagreg 197
        GPIO_InitStructure.GPIO_Alternate =     GPIO_InputAlt1;
198
        GPIO_Init(GPIO2, &GPIO_InitStructure);
1 ingob 199
 
241 killagreg 200
        // empty rx and tx buffer
41 ingob 201
        I2C_TxBufferSize = 0;
202
        I2C_RxBufferSize = 0;
37 killagreg 203
 
189 killagreg 204
        I2C1_Timeout = SetDelay(10*I2C1_TIMEOUT);
37 killagreg 205
 
110 killagreg 206
        UART1_PutString("ok");
41 ingob 207
}
1 ingob 208
 
41 ingob 209
 
210
//--------------------------------------------------------------
211
void I2C1_IRQHandler(void)
212
{
241 killagreg 213
        static u8 Rx_Idx = 0, Tx_Idx = 0;
41 ingob 214
        u16 status;
189 killagreg 215
 
195 killagreg 216
        //IENABLE;  // do not enable IRQ nesting for I2C!!!!
217
 
41 ingob 218
        // detemine I2C State
219
        status = I2C_GetLastEvent(I2C1);
220
 
221
        if(status & (I2C_FLAG_AF|I2C_FLAG_BERR))  // if an acknowledge failure or bus error occured
79 killagreg 222
        {       // Set and subsequently clear the STOP bit while BTF is set.
41 ingob 223
                while(I2C_GetFlagStatus (I2C1, I2C_FLAG_BTF) != RESET)
224
                {
189 killagreg 225
                        I2C_GenerateSTOP (I2C1, ENABLE);  // free the bus
41 ingob 226
                        I2C_GenerateSTOP (I2C1, DISABLE); // free the bus
227
                }
241 killagreg 228
                I2C_State = I2C_STATE_IDLE;
189 killagreg 229
                VIC_ITCmd(I2C1_ITLine, DISABLE);
41 ingob 230
                LED_GRN_OFF;
189 killagreg 231
                return;
41 ingob 232
        }
233
        else
234
        {       // depending on current i2c state
241 killagreg 235
                switch(status)
41 ingob 236
                {
237
                        // the start condition was initiated on the bus
238
                        case I2C_EVENT_MASTER_MODE_SELECT:
239
                                LED_GRN_ON;
240
                                // update current bus state variable
241 killagreg 241
                                // jump to rx state if there is nothing to send
41 ingob 242
                                switch(I2C_Direction)
243
                                {
244
                                        case I2C_MODE_TRANSMITTER:
241 killagreg 245
                                                I2C_State = I2C_STATE_TX_PROGRESS;
41 ingob 246
                                                break;
79 killagreg 247
 
41 ingob 248
                                        case I2C_MODE_RECEIVER:
241 killagreg 249
                                                if (I2C_RxBufferSize == 0) // nothingto send?
41 ingob 250
                                                {
251
                                                        I2C_GenerateSTOP (I2C1, ENABLE);
189 killagreg 252
                                                        VIC_ITCmd(I2C1_ITLine, DISABLE);
253
                                                        LED_GRN_OFF;
241 killagreg 254
                                                        I2C_State = I2C_STATE_IDLE;
41 ingob 255
                                                        return;
256
                                                }
257
                                                else
258
                                                {
241 killagreg 259
                                                        I2C_State = I2C_STATE_RX_PROGRESS;
41 ingob 260
                                                }
261
                                                break;
79 killagreg 262
 
41 ingob 263
                                        default: // invalid direction
264
                                                I2C_GenerateSTOP (I2C1, ENABLE);
189 killagreg 265
                                                VIC_ITCmd(I2C1_ITLine, DISABLE);
266
                                                LED_GRN_OFF;
241 killagreg 267
                                                I2C_State = I2C_STATE_IDLE;
41 ingob 268
                                                return;
269
                                }
270
                                // enable acknowledge
271
                                I2C_AcknowledgeConfig (I2C1, ENABLE);
272
                                // send address/direction byte on the bus
241 killagreg 273
                                I2C_Send7bitAddress(I2C1, I2C_SlaveAddress, I2C_Direction);
41 ingob 274
                                break;
79 killagreg 275
 
41 ingob 276
                        // the address byte was send
277
                        case I2C_EVENT_MASTER_MODE_SELECTED:
278
                                // Clear EV6 by set again the PE bit
79 killagreg 279
                                I2C_Cmd(I2C1, ENABLE);
41 ingob 280
                                switch(I2C_State)
281
                                {
241 killagreg 282
                                        case I2C_STATE_TX_PROGRESS:
283
                                        // send 1st data byte
41 ingob 284
                                        Tx_Idx = 0;
241 killagreg 285
                                        I2C_SendData(I2C1, I2C_TxBuffer[Tx_Idx]);
286
                                        Tx_Idx++;
41 ingob 287
                                        // reset timeout
189 killagreg 288
                                        I2C1_Timeout = SetDelay(I2C1_TIMEOUT); // after inactivity the I2C1 bus will be reset
41 ingob 289
                                        break;
79 killagreg 290
 
241 killagreg 291
                                        case I2C_STATE_RX_PROGRESS:
41 ingob 292
                                        Rx_Idx = 0;
241 killagreg 293
                                        // disable acknoledge if only one byte has to be read
294
                                        if(I2C_RxBufferSize == 1) I2C_AcknowledgeConfig (I2C1, DISABLE);               
41 ingob 295
                                        break;
79 killagreg 296
 
41 ingob 297
                                        default: // unknown I2C state
298
                                        // should never happen
299
                                        I2C_GenerateSTOP (I2C1, ENABLE);
189 killagreg 300
                                        LED_GRN_OFF;
301
                                        VIC_ITCmd(I2C1_ITLine, DISABLE);
241 killagreg 302
                                        I2C_State = I2C_STATE_IDLE;
189 killagreg 303
                                        return;
41 ingob 304
                                        break;
305
                                }
306
                                break;
79 killagreg 307
 
41 ingob 308
                        // the master has transmitted a byte and slave has been acknowledged
309
                        case I2C_EVENT_MASTER_BYTE_TRANSMITTED:
79 killagreg 310
 
41 ingob 311
                                // some bytes have to be transmitted
312
                                if(Tx_Idx < I2C_TxBufferSize)
313
                                {
241 killagreg 314
                                        I2C_SendData(I2C1, I2C_TxBuffer[Tx_Idx]);
315
                                        Tx_Idx++;
41 ingob 316
                                }
189 killagreg 317
                                else // last byte was send
318
                                {
41 ingob 319
                                        // generate stop or repeated start condition
241 killagreg 320
                                        if (I2C_RxBufferSize > 0) // is any answer byte expected?
41 ingob 321
                                        {
79 killagreg 322
                                                I2C_Direction = I2C_MODE_RECEIVER; // switch to master receiver after repeated start condition
323
                                                I2C_GenerateStart(I2C1, ENABLE);   // initiate repeated start condition on the bus
41 ingob 324
                                        }
325
                                        else
326
                                        {   // stop communication
327
                                                I2C_GenerateSTOP(I2C1, ENABLE); // generate stop condition to free the bus
189 killagreg 328
                                                VIC_ITCmd(I2C1_ITLine, DISABLE);
41 ingob 329
                                                LED_GRN_OFF;
241 killagreg 330
                                                I2C_State = I2C_STATE_IDLE;                     // ready for new actions        
41 ingob 331
                                        }
332
                                }
333
                                break;
79 killagreg 334
 
41 ingob 335
                        // the master has received a byte from the slave
79 killagreg 336
                        case I2C_EVENT_MASTER_BYTE_RECEIVED:
41 ingob 337
                                // some bytes have to be received
241 killagreg 338
                                if ( Rx_Idx+1 < I2C_RxBufferSize)
41 ingob 339
                                {       // copy received byte  from the data register to the rx-buffer
241 killagreg 340
                                        I2C_RxBuffer[Rx_Idx] = I2C_ReceiveData(I2C1);
41 ingob 341
                                }
241 killagreg 342
                                else // if the last byte was received
41 ingob 343
                                {
344
                                        // generate a STOP condition on the bus before reading data register
345
                                        I2C_GenerateSTOP(I2C1, ENABLE);
241 killagreg 346
                                        I2C_RxBuffer[Rx_Idx] = I2C_ReceiveData(I2C1);
347
                                        // call the rx handler function to process recieved data
348
                                        if(I2C_pRxHandler != NULL) (*I2C_pRxHandler)((u8*)I2C_RxBuffer, I2C_RxBufferSize);
349
                                        I2C1_Timeout = SetDelay(I2C1_TIMEOUT);
350
                                        DebugOut.Analog[15]++;
189 killagreg 351
                                        VIC_ITCmd(I2C1_ITLine, DISABLE);
352
                                        LED_GRN_OFF;
241 killagreg 353
                                        I2C_State = I2C_STATE_IDLE;
189 killagreg 354
                                        return;
41 ingob 355
                                }
356
                                Rx_Idx++;
357
                                // if the 2nd last byte was received disable acknowledge for the last one
241 killagreg 358
                                if ( (Rx_Idx + 1) == I2C_RxBufferSize )
41 ingob 359
                                {
241 killagreg 360
                                        I2C_AcknowledgeConfig(I2C1, DISABLE);
41 ingob 361
                                }
362
                                break;
79 killagreg 363
 
241 killagreg 364
                        default:// unknown event
365
                                // should never happen
366
                                I2C_GenerateSTOP (I2C1, ENABLE);
367
                                LED_GRN_OFF;
368
                                VIC_ITCmd(I2C1_ITLine, DISABLE);
369
                                I2C_State = I2C_STATE_IDLE;
41 ingob 370
                                break;
371
                }
372
        }
195 killagreg 373
        //IDISABLE;      // do not enable IRQ nesting for I2C!!!!
1 ingob 374
}
241 killagreg 375
// ----------------------------------------------------------------------------------------
376
// initate an i2c transmission
377
u8 I2C_Transmission(u8 SlaveAddr, I2C_pRxHandler_t pRxHandler, u8 RxBytes)
1 ingob 378
{
241 killagreg 379
        u8 retval = 0;
380
 
381
        if(I2C_State == I2C_STATE_IDLE)
41 ingob 382
        {
241 killagreg 383
                I2C_RxBufferSize = RxBytes;
384
                // set direction to master transmitter
385
                if( (I2C_TxBufferSize > 0) && (I2C_TxBufferSize < I2C_TXBUFFER_LEN) ) I2C_Direction = I2C_MODE_TRANSMITTER;
386
                else if (( I2C_RxBufferSize > 0 ) && (I2C_RxBufferSize < I2C_RXBUFFER_LEN) ) I2C_Direction = I2C_MODE_RECEIVER;
387
                else // nothing to send or receive
189 killagreg 388
                {
241 killagreg 389
                        I2C_TxBufferSize = 0;
390
                        I2C_RxBufferSize = 0;
391
                        // enable I2C IRQ again
392
                        VIC_ITCmd(I2C1_ITLine, ENABLE);
393
                        return(retval);
189 killagreg 394
                }
241 killagreg 395
                // update slave address and rx data handler     funbction pointer
396
                I2C_SlaveAddress = SlaveAddr;
397
                I2C_pRxHandler = pRxHandler;
189 killagreg 398
                // test on busy flag and clear it
399
                I2C_CheckEvent( I2C1, I2C_FLAG_BUSY );
400
                // initiate start condition on the bus
401
                I2C_GenerateStart(I2C1, ENABLE);
241 killagreg 402
                retval = 1;
403
         }
404
         return(retval);
41 ingob 405
}