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Simple Atmega TWI echo slave

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mandlm 2016-01-17 20:25:48 +01:00
parent 121a0408c5
commit 1757c1a550
6 changed files with 298 additions and 0 deletions
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20
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Microsoft Visual Studio Solution File, Format Version 11.00
# Atmel Studio Solution File, Format Version 11.00
Project("{E66E83B9-2572-4076-B26E-6BE79FF3018A}") = "TWI", "TWI\TWI.cppproj", "{46349E95-E546-4344-8620-E0A6F53C8C82}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|AVR = Debug|AVR
Release|AVR = Release|AVR
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{46349E95-E546-4344-8620-E0A6F53C8C82}.Debug|AVR.ActiveCfg = Debug|AVR
{46349E95-E546-4344-8620-E0A6F53C8C82}.Debug|AVR.Build.0 = Debug|AVR
{46349E95-E546-4344-8620-E0A6F53C8C82}.Release|AVR.ActiveCfg = Release|AVR
{46349E95-E546-4344-8620-E0A6F53C8C82}.Release|AVR.Build.0 = Release|AVR
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal

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#include "Pin.h"
#include "environment.h"
#include <util/delay.h>
Pin::Pin(volatile uint8_t *port, uint8_t pin)
: m_port(port)
, m_pin(pin)
{
}
void Pin::pulse()
{
*m_port |= (1 << m_pin);
*m_port &= ~(1 << m_pin);
}
void Pin::set(bool value)
{
if (value == true)
{
*m_port |= (1 << m_pin);
}
else
{
*m_port &= ~(1 << m_pin);
}
}
void Pin::toggle()
{
*m_port ^= (1 << m_pin);
}
void Pin::blink()
{
*m_port |= (1 << m_pin);
_delay_ms(50);
*m_port &= ~(1 << m_pin);
}

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TWI/TWI/Pin.h Normal file
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#pragma once
#include <avr/io.h>
class Pin
{
private:
volatile uint8_t *m_port;
uint8_t m_pin;
public:
Pin(volatile uint8_t *port, uint8_t pin);
void pulse();
void set(bool value);
void toggle();
void blink();
};

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#include "environment.h"
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <util/twi.h>
#include "Pin.h"
void I2C_init(uint8_t address)
{
// load address into TWI address register
TWAR = (address << 1);
// set the TWCR to enable address matching and enable TWI, clear TWINT, enable TWI interrupt
TWCR = (1<<TWIE) | (1<<TWEA) | (1<<TWEN);
}
void I2C_stop(void)
{
// clear acknowledge and enable bits
TWCR &= ~( (1<<TWEA) | (1<<TWEN) );
}
volatile uint8_t dataBuffer;
ISR(TWI_vect)
{
switch (TW_STATUS)
{
case TW_SR_SLA_ACK: // own address has been acknowledged
// clear TWI interrupt flag, prepare to receive next byte and acknowledge
TWCR |= (1<<TWIE) | (1<<TWINT) | (1<<TWEA) | (1<<TWEN);
break;
case TW_SR_DATA_ACK:
dataBuffer = TWDR;
TWCR |= (1<<TWIE) | (1<<TWINT) | (1<<TWEA) | (1<<TWEN);
break;
case TW_ST_SLA_ACK:
TWDR = dataBuffer + 1;
TWCR |= (1<<TWIE) | (1<<TWINT) | (0<<TWEA) | (1<<TWEN);
break;
default:
// if none of the above apply prepare TWI to be addressed again
TWCR |= (1<<TWIE) | (1<<TWEA) | (1<<TWEN);
}
}
int main(void)
{
DDRD |= (1 << PD6);
Pin statusLed(&PORTD, PD6);
statusLed.set(false);
I2C_init(0x23);
sei();
while(1)
{
}
}

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<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<SchemaVersion>2.0</SchemaVersion>
<ProjectVersion>6.2</ProjectVersion>
<ToolchainName>com.Atmel.AVRGCC8.CPP</ToolchainName>
<ProjectGuid>{46349e95-e546-4344-8620-e0a6f53c8c82}</ProjectGuid>
<avrdevice>ATmega32</avrdevice>
<avrdeviceseries>none</avrdeviceseries>
<OutputType>Executable</OutputType>
<Language>CPP</Language>
<OutputFileName>$(MSBuildProjectName)</OutputFileName>
<OutputFileExtension>.elf</OutputFileExtension>
<OutputDirectory>$(MSBuildProjectDirectory)\$(Configuration)</OutputDirectory>
<AssemblyName>TWI</AssemblyName>
<Name>TWI</Name>
<RootNamespace>TWI</RootNamespace>
<ToolchainFlavour>Native</ToolchainFlavour>
<KeepTimersRunning>true</KeepTimersRunning>
<OverrideVtor>false</OverrideVtor>
<CacheFlash>true</CacheFlash>
<ProgFlashFromRam>true</ProgFlashFromRam>
<RamSnippetAddress>0x20000000</RamSnippetAddress>
<UncachedRange />
<preserveEEPROM>true</preserveEEPROM>
<OverrideVtorValue>exception_table</OverrideVtorValue>
<BootSegment>2</BootSegment>
<eraseonlaunchrule>0</eraseonlaunchrule>
<AsfFrameworkConfig>
<framework-data xmlns="">
<options />
<configurations />
<files />
<documentation help="" />
<offline-documentation help="" />
<dependencies>
<content-extension eid="atmel.asf" uuidref="Atmel.ASF" version="3.29.0" />
</dependencies>
</framework-data>
</AsfFrameworkConfig>
<avrtool>com.atmel.avrdbg.tool.stk500</avrtool>
<com_atmel_avrdbg_tool_stk500>
<ToolOptions>
<InterfaceProperties>
<IspClock>125000</IspClock>
</InterfaceProperties>
<InterfaceName>ISP</InterfaceName>
</ToolOptions>
<ToolType>com.atmel.avrdbg.tool.stk500</ToolType>
<ToolNumber>
</ToolNumber>
<ToolName>STK500</ToolName>
</com_atmel_avrdbg_tool_stk500>
<avrtoolinterface>ISP</avrtoolinterface>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">
<ToolchainSettings>
<AvrGccCpp>
<avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
<avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
<avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
<avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
<avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
<avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
<avrgcc.compiler.symbols.DefSymbols>
<ListValues>
<Value>NDEBUG</Value>
</ListValues>
</avrgcc.compiler.symbols.DefSymbols>
<avrgcc.compiler.optimization.level>Optimize for size (-Os)</avrgcc.compiler.optimization.level>
<avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
<avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
<avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
<avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
<avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
<avrgcccpp.compiler.symbols.DefSymbols>
<ListValues>
<Value>NDEBUG</Value>
</ListValues>
</avrgcccpp.compiler.symbols.DefSymbols>
<avrgcccpp.compiler.optimization.level>Optimize for size (-Os)</avrgcccpp.compiler.optimization.level>
<avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
<avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
<avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
<avrgcccpp.linker.libraries.Libraries>
<ListValues>
<Value>libm</Value>
</ListValues>
</avrgcccpp.linker.libraries.Libraries>
</AvrGccCpp>
</ToolchainSettings>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)' == 'Debug' ">
<ToolchainSettings>
<AvrGccCpp>
<avrgcc.common.outputfiles.hex>True</avrgcc.common.outputfiles.hex>
<avrgcc.common.outputfiles.lss>True</avrgcc.common.outputfiles.lss>
<avrgcc.common.outputfiles.eep>True</avrgcc.common.outputfiles.eep>
<avrgcc.common.outputfiles.srec>True</avrgcc.common.outputfiles.srec>
<avrgcc.common.outputfiles.usersignatures>False</avrgcc.common.outputfiles.usersignatures>
<avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcc.compiler.general.ChangeDefaultCharTypeUnsigned>
<avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
<avrgcc.compiler.symbols.DefSymbols>
<ListValues>
<Value>DEBUG</Value>
</ListValues>
</avrgcc.compiler.symbols.DefSymbols>
<avrgcc.compiler.optimization.level>Optimize (-O1)</avrgcc.compiler.optimization.level>
<avrgcc.compiler.optimization.PackStructureMembers>True</avrgcc.compiler.optimization.PackStructureMembers>
<avrgcc.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcc.compiler.optimization.AllocateBytesNeededForEnum>
<avrgcc.compiler.optimization.DebugLevel>Default (-g2)</avrgcc.compiler.optimization.DebugLevel>
<avrgcc.compiler.warnings.AllWarnings>True</avrgcc.compiler.warnings.AllWarnings>
<avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultCharTypeUnsigned>
<avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
<avrgcccpp.compiler.symbols.DefSymbols>
<ListValues>
<Value>DEBUG</Value>
</ListValues>
</avrgcccpp.compiler.symbols.DefSymbols>
<avrgcccpp.compiler.optimization.level>Optimize (-O1)</avrgcccpp.compiler.optimization.level>
<avrgcccpp.compiler.optimization.PackStructureMembers>True</avrgcccpp.compiler.optimization.PackStructureMembers>
<avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>True</avrgcccpp.compiler.optimization.AllocateBytesNeededForEnum>
<avrgcccpp.compiler.optimization.DebugLevel>Default (-g2)</avrgcccpp.compiler.optimization.DebugLevel>
<avrgcccpp.compiler.warnings.AllWarnings>True</avrgcccpp.compiler.warnings.AllWarnings>
<avrgcccpp.linker.libraries.Libraries>
<ListValues>
<Value>libm</Value>
</ListValues>
</avrgcccpp.linker.libraries.Libraries>
<avrgcccpp.assembler.debugging.DebugLevel>Default (-Wa,-g)</avrgcccpp.assembler.debugging.DebugLevel>
</AvrGccCpp>
</ToolchainSettings>
</PropertyGroup>
<ItemGroup>
<Compile Include="environment.h">
<SubType>compile</SubType>
</Compile>
<Compile Include="Pin.cpp">
<SubType>compile</SubType>
</Compile>
<Compile Include="Pin.h">
<SubType>compile</SubType>
</Compile>
<Compile Include="TWI.cpp">
<SubType>compile</SubType>
</Compile>
</ItemGroup>
<Import Project="$(AVRSTUDIO_EXE_PATH)\\Vs\\Compiler.targets" />
</Project>

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#pragma once
#define F_CPU 12000000