Simple Atmega TWI echo slave

2016-01-17 20:25:48 +01:00 · 2016-01-17 20:25:48 +01:00 · 1757c1a550
parent 121a0408c5
commit 1757c1a550
6 changed files with 298 additions and 0 deletions
--- a/TWI/TWI.atsln
+++ b/TWI/TWI.atsln
@ -0,0 +1,20 @@
+
+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
--- a/TWI/TWI/Pin.cpp
+++ b/TWI/TWI/Pin.cpp
@ -0,0 +1,43 @@
+#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);
+}
+
--- a/TWI/TWI/Pin.h
+++ b/TWI/TWI/Pin.h
@ -0,0 +1,19 @@
+#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();
+};
--- a/TWI/TWI/TWI.cpp
+++ b/TWI/TWI/TWI.cpp
@ -0,0 +1,63 @@
+#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)
+	{
+	}
+}
--- a/TWI/TWI/TWI.cppproj
+++ b/TWI/TWI/TWI.cppproj
@ -0,0 +1,150 @@
+<?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>
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+        <avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcc.compiler.general.ChangeDefaultBitFieldUnsigned>
+        <avrgcc.compiler.symbols.DefSymbols>
+          <ListValues>
+            <Value>NDEBUG</Value>
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+        </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>
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+        <avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>True</avrgcccpp.compiler.general.ChangeDefaultBitFieldUnsigned>
+        <avrgcccpp.compiler.symbols.DefSymbols>
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+        <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>
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+        <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>
--- a/TWI/TWI/environment.h
+++ b/TWI/TWI/environment.h
@ -0,0 +1,3 @@
+#pragma once
+
+#define F_CPU 12000000