1,23 → 1,37 |
/*############################################################################ |
Slaveadr = 0x52 = Vorne, 0x54 = Hinten, 0x56 = Rechts, 0x58 = Links |
############################################################################*/ |
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#include <avr/io.h> |
#include <util/twi.h> |
#include "main.h" |
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unsigned char I2C_RXBuffer; |
unsigned char Byte_Counter=0; |
unsigned char I2C_RxBufferSize, I2C_TxBufferSize; |
unsigned char *I2C_TxBuffer, *I2C_RxBuffer; |
unsigned char Tx_Idx=0, Rx_Idx=0, I2C_Direction; |
unsigned char I2C_Command; |
unsigned char Tx_Idx, Rx_Idx; |
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struct str_I2C_Heading I2C_Heading; |
struct str_I2C_WriteNickRoll I2C_WriteNickRoll; |
struct str_I2C_Mag I2C_Mag; |
struct str_I2C_EEPROM I2C_ReadEEPROM, I2C_WriteEEPROM; |
struct str_I2C_Version I2C_Version; |
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//############################################################################ |
//I2C (TWI) Interface Init |
void InitIC2_Slave(uint8_t adr) |
void InitIC2_Slave(void) |
//############################################################################ |
{ |
TWAR = adr; // Eigene Adresse setzen |
TWAR = I2C_SLAVE_ADDRESS; // Eigene Adresse setzen |
TWCR = (1<<TWINT) | (1<<TWEN) | (1<<TWIE) | (1<<TWEA); |
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I2C_Version.Hauptversion = VersionInfo.Hauptversion; |
I2C_Version.Nebenversion = VersionInfo.Nebenversion; |
I2C_Version.Comp = 1; |
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} |
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#define TWCR_ACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC) |
//############################################################################ |
//ISR, die bei einem Ereignis auf dem Bus ausgelöst wird. Im Register TWSR befindet |
//sich dann ein Statuscode, anhand dessen die Situation festgestellt werden kann. |
27,40 → 41,85 |
switch (TWSR & 0xF8) |
{ |
case SR_SLA_ACK: |
TWCR |= (1<<TWINT); |
Byte_Counter=0; |
//TWCR |= (1<<TWINT); |
Rx_Idx = 0; |
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TWCR_ACK; |
return; |
// Daten Empfangen |
case SR_PREV_ACK: |
I2C_RXBuffer = TWDR; |
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if (Rx_Idx == 0) |
{ I2C_Command = TWDR; |
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switch(I2C_Command) |
{ |
case I2C_CMD_VERSION: |
I2C_TxBuffer = (unsigned char *)&I2C_Version; |
I2C_TxBufferSize = sizeof(I2C_Version); |
I2C_RxBufferSize = 0; |
break; |
case I2C_CMD_WRITE_EEPROM: |
I2C_TxBufferSize = 0; |
I2C_RxBuffer = (unsigned char *)&I2C_WriteEEPROM; |
I2C_RxBufferSize = sizeof(I2C_WriteEEPROM); |
break; |
case I2C_CMD_READ_EEPROM: |
I2C_TxBuffer = (unsigned char *)&I2C_ReadEEPROM.Inhalt; |
I2C_TxBufferSize = 2; |
I2C_RxBuffer = (unsigned char *)&I2C_ReadEEPROM; |
I2C_RxBufferSize = 1; |
break; |
case I2C_CMD_READ_MAG: |
I2C_TxBuffer = (unsigned char *)&I2C_Mag; |
I2C_TxBufferSize = sizeof(I2C_Mag); |
I2C_RxBufferSize = 0; |
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I2C_Mag.MagX = MagnetN; |
I2C_Mag.MagY = MagnetR; |
I2C_Mag.MagZ = MagnetZ; |
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break; |
case I2C_CMD_READ_HEADING: |
I2C_TxBuffer = (unsigned char *)&I2C_Heading; |
I2C_TxBufferSize = sizeof(I2C_Heading); |
I2C_RxBuffer = (unsigned char *)&I2C_WriteNickRoll; |
I2C_RxBufferSize = sizeof(I2C_WriteNickRoll); |
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I2C_Heading.Heading = Heading; |
WinkelOut.Winkel[NICK] = I2C_WriteNickRoll.Nick; |
WinkelOut.Winkel[ROLL] = I2C_WriteNickRoll.Roll; |
break; |
} |
} |
else |
{ |
if (Rx_Idx < I2C_RxBufferSize) I2C_RxBuffer[Rx_Idx] = TWDR; |
} |
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Rx_Idx++; |
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I2C_Timeout = 500; |
TWCR |= (1<<TWINT); |
//TWCR |= (1<<TWINT); |
TWCR_ACK; |
return; |
// Daten Senden |
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case SW_SLA_ACK: |
if (Byte_Counter==0) |
{ |
TWDR = 0;//Mittelstrom; |
Byte_Counter++; |
} |
else |
{ |
TWDR = 0;//MaxPWM; |
} |
TWCR |= (1<<TWINT); |
Tx_Idx = 0; |
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if (I2C_TxBufferSize > 0) TWDR = I2C_TxBuffer[Tx_Idx++]; |
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// TWCR |= (1<<TWINT) | (1<< TWEA); |
TWCR_ACK; |
return; |
// Daten Senden |
case SW_DATA_ACK: |
if (Byte_Counter==0) |
{ |
TWDR = 0;//Mittelstrom; |
Byte_Counter++; |
} |
else |
{ |
TWDR = 0;//MaxPWM; |
} |
TWCR |= (1<<TWINT); |
case SW_DATA_ACK: |
if (Tx_Idx < I2C_TxBufferSize) TWDR = I2C_TxBuffer[Tx_Idx++]; |
else TWDR = 0x00; |
//TWCR |= (1<<TWINT) | (1<< TWEA); |
TWCR_ACK; |
return; |
// Bus-Fehler zurücksetzen |
case TWI_BUS_ERR_2: |