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plik .c
[syntax=c]
// This file has been prepared for Doxygen automatic documentation generation.
/*! \file ********************************************************************
*
* Atmel Corporation
*
* File : USI_TWI_Slave.c
* Compiler : IAR EWAAVR 3.20c
* Revision : $Revision: 1.14 $
* Date : $Date: Friday, December 09, 2005 17:25:38 UTC $
* Updated by : $Author: jtyssoe $
*
* Support mail : avr@atmel.com
*
* Supported devices : All device with USI module can be used.
*
* AppNote : AVR312 - Using the USI module as a I2C slave
*
* Description : Example showing how to use the USI_TWI drivers;
* Loops back received data.
*
*
****************************************************************************/
#include <stdio.h>
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include <util/delay.h>
#include "i2c_usi_slave.h"
// Sample TWI transmission commands
#define TWI_CMD_MASTER_WRITE 0x10
#define TWI_CMD_MASTER_READ 0x20
#define TWI_CMD_MASTER_WRITE_ALOT 0x30
/* \Brief The main function.
* The program entry point. Initates TWI and enters eternal loop, waiting for data.
*/
int main( void )
{
unsigned char TWI_slaveAddress, temp;
// LED feedback port - connect port B to the STK500 LEDS
DDRB = 0xFF; // Set to ouput
PORTB = 0x55; // Startup pattern
DDRA = 0xFF; // L2 Used to time interrupts.
// Own TWI slave address
TWI_slaveAddress = 0x10;
USI_TWI_Slave_Initialise( TWI_slaveAddress );
sei();
// This loop runs forever. If the TWI Transceiver is busy the execution will just continue doing other operations.
for(;;)
{
if( USI_TWI_Data_In_Receive_Buffer() )
{
temp = USI_TWI_Receive_Byte();
PORTB = temp;
USI_TWI_Transmit_Byte(temp);
}
// Do something else while waiting for the TWI transceiver to complete.
// __no_operation(); // Put own code here.
}
}
/*! \mainpage
* \section Intro Introduction
* This documents data structures, functions, variables, defines, enums, and
* typedefs in the software for application note AVR312.
*
* \section CI Compilation Info
* This software was written for the IAR Embedded Workbench 4.11A.
*
* To make project:
* <ol>
* <li> Add the file main.c and USI_TWI_Slave to project.
* <li> Under processor configuration, select any AVR device with USI module.
* <li> Enable bit definitions in I/O include files
* <li> High optimization on size is recommended for lower code size.
* </ol>
*
* \section DI Device Info
* The included source code is written for all devices with with a USI module.
*
* \section TS Target setup
* This example is made to work together with the AVR310 USI TWI Master application note. In adition to connecting the TWI
* pins, also connect PORTB to the LEDS. The code reads a message as a TWI slave and acts according to if it is a
* general call, or an address call. If it is an address call, then the first byte is considered a command byte and
* it then responds differently according to the commands.
*
*/
plik .h
// This file has been prepared for Doxygen automatic documentation generation.
/*! \file ********************************************************************
*
* Atmel Corporation
*
* File : USI_TWI_Slave.h
* Compiler : IAR EWAAVR 4.11A
* Revision : $Revision: 1.14 $
* Date : $Date: Friday, December 09, 2005 17:25:38 UTC $
* Updated by : $Author: jtyssoe $
*
* Support mail : avr@atmel.com
*
* Supported devices : All device with USI module can be used.
* The example is written for the ATmega169, ATtiny26 & ATtiny2313
*
* AppNote : AVR312 - Using the USI module as a TWI slave
*
* Description : Header file for USI_TWI driver
*
*
*
****************************************************************************/
//! Prototypes
void USI_TWI_Slave_Initialise( unsigned char );
void USI_TWI_Transmit_Byte( unsigned char );
unsigned char USI_TWI_Receive_Byte( void );
unsigned char USI_TWI_Data_In_Receive_Buffer( void );
void Timer_Init(void);
#define TRUE 1
#define FALSE 0
typedef unsigned char uint8_t;
//////////////////////////////////////////////////////////////////
///////////////// Driver Buffer Definitions //////////////////////
//////////////////////////////////////////////////////////////////
// 1,2,4,8,16,32,64,128 or 256 bytes are allowed buffer sizes
#define TWI_RX_BUFFER_SIZE (16)
#define TWI_RX_BUFFER_MASK ( TWI_RX_BUFFER_SIZE - 1 )
#if ( TWI_RX_BUFFER_SIZE & TWI_RX_BUFFER_MASK )
#error TWI RX buffer size is not a power of 2
#endif
// 1,2,4,8,16,32,64,128 or 256 bytes are allowed buffer sizes
#define TWI_TX_BUFFER_SIZE (16)
#define TWI_TX_BUFFER_MASK ( TWI_TX_BUFFER_SIZE - 1 )
#if ( TWI_TX_BUFFER_SIZE & TWI_TX_BUFFER_MASK )
#error TWI TX buffer size is not a power of 2
#endif
#define USI_SLAVE_CHECK_ADDRESS (0x00)
#define USI_SLAVE_SEND_DATA (0x01)
#define USI_SLAVE_REQUEST_REPLY_FROM_SEND_DATA (0x02)
#define USI_SLAVE_CHECK_REPLY_FROM_SEND_DATA (0x03)
#define USI_SLAVE_REQUEST_DATA (0x04)
#define USI_SLAVE_GET_DATA_AND_SEND_ACK (0x05)
/*
//! Device dependent defines
#if defined(__AT90tiny26__) | defined(__ATtiny26__)
#define DDR_USI DDRB
#define PORT_USI PORTB
#define PIN_USI PINB
#define PORT_USI_SDA PORTB0
#define PORT_USI_SCL PORTB2
#define PIN_USI_SDA PINB0
#define PIN_USI_SCL PINB2
#define USI_START_COND_INT USISIF
#define USI_START_VECTOR USI_STRT_vect
#define USI_OVERFLOW_VECTOR USI_OVF_vect
#endif
#if defined(__AT90Tiny2313__) | defined(__ATtiny2313__)
*/
#define DDR_USI DDRB
#define PORT_USI PORTB
#define PIN_USI PINB
#define PORT_USI_SDA PORTB5
#define PORT_USI_SCL PORTB7
#define PIN_USI_SDA PINB5
#define PIN_USI_SCL PINB7
#define USI_START_COND_INT USISIF
#define USI_START_VECTOR USI_STRT_vect
#define USI_OVERFLOW_VECTOR USI_OVF_vect
/*
#endif
#if defined(__ATtiny25__) | defined(__ATtiny45__) | defined(__ATtiny85__)
#define DDR_USI DDRB
#define PORT_USI PORTB
#define PIN_USI PINB
#define PORT_USI_SDA PORTB0
#define PORT_USI_SCL PORTB2
#define PIN_USI_SDA PINB0
#define PIN_USI_SCL PINB2
#define USI_START_COND_INT USICIF
#define USI_START_VECTOR USI_START_vect
#define USI_OVERFLOW_VECTOR USI_OVF_vect
#endif
#if defined(__AT90Mega165__) | defined(__ATmega165__) | \
defined(__ATmega325__) | defined(__ATmega3250__) | \
defined(__ATmega645__) | defined(__ATmega6450__) | \
defined(__ATmega329__) | defined(__ATmega3290__) | \
defined(__ATmega649__) | defined(__ATmega6490__)
#define DDR_USI DDRE
#define PORT_USI PORTE
#define PIN_USI PINE
#define PORT_USI_SDA PORTE5
#define PORT_USI_SCL PORTE4
#define PIN_USI_SDA PINE5
#define PIN_USI_SCL PINE4
#define USI_START_COND_INT USISIF
#define USI_START_VECTOR USI_START_vect
#define USI_OVERFLOW_VECTOR USI_OVERFLOW_vect
#endif
#if defined(__AT90Mega169__) | defined(__ATmega169__)
#define DDR_USI DDRE
#define PORT_USI PORTE
#define PIN_USI PINE
#define PORT_USI_SDA PORTE5
#define PORT_USI_SCL PORTE4
#define PIN_USI_SDA PINE5
#define PIN_USI_SCL PINE4
#define USI_START_COND_INT USISIF
#define USI_START_VECTOR USI_STRT_vect
#define USI_OVERFLOW_VECTOR USI_OVF_vect
#endif
*/
//! Functions implemented as macros
#define SET_USI_TO_SEND_ACK() \
{ \
USIDR = 0; /* Prepare ACK */ \
DDR_USI |= (1<<PORT_USI_SDA); /* Set SDA as output */ \
USISR = (0<<USI_START_COND_INT)|(1<<USIOIF)|(1<<USIPF)|(1<<USIDC)| /* Clear all flags, except Start Cond */ \
(0x0E<<USICNT0); /* set USI counter to shift 1 bit. */ \
}
#define SET_USI_TO_READ_ACK() \
{ \
DDR_USI &= ~(1<<PORT_USI_SDA); /* Set SDA as intput */ \
USIDR = 0; /* Prepare ACK */ \
USISR = (0<<USI_START_COND_INT)|(1<<USIOIF)|(1<<USIPF)|(1<<USIDC)| /* Clear all flags, except Start Cond */ \
(0x0E<<USICNT0); /* set USI counter to shift 1 bit. */ \
}
#define SET_USI_TO_TWI_START_CONDITION_MODE() \
{ \
USICR = (1<<USISIE)|(0<<USIOIE)| /* Enable Start Condition Interrupt. Disable Overflow Interrupt.*/ \
(1<<USIWM1)|(0<<USIWM0)| /* Set USI in Two-wire mode. No USI Counter overflow hold. */ \
(1<<USICS1)|(0<<USICS0)|(0<<USICLK)| /* Shift Register Clock Source = External, positive edge */ \
(0<<USITC); \
USISR = (0<<USI_START_COND_INT)|(1<<USIOIF)|(1<<USIPF)|(1<<USIDC)| /* Clear all flags, except Start Cond */ \
(0x0<<USICNT0); \
}
#define SET_USI_TO_SEND_DATA() \
{ \
DDR_USI |= (1<<PORT_USI_SDA); /* Set SDA as output */ \
USISR = (0<<USI_START_COND_INT)|(1<<USIOIF)|(1<<USIPF)|(1<<USIDC)| /* Clear all flags, except Start Cond */ \
(0x0<<USICNT0); /* set USI to shift out 8 bits */ \
}
#define SET_USI_TO_READ_DATA() \
{ \
DDR_USI &= ~(1<<PORT_USI_SDA); /* Set SDA as input */ \
USISR = (0<<USI_START_COND_INT)|(1<<USIOIF)|(1<<USIPF)|(1<<USIDC)| /* Clear all flags, except Start Cond */ \
(0x0<<USICNT0); /* set USI to shift out 8 bits */ \
}
[/syntax]
To jest jeden z problemów które bym chciał widzieć w następnej książce Mirka.
Usi master/slave dla I2C.
Usi master/ slave dla SPI.
Dla TWI- też.
Coś można znaleźć, coś działa- ale Mirek pewnie to zrobi lepiej.Statystyki: Napisane przez janbernat — 16 cze 2012, o 21:34
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