From 9001b7b77a9068f644b09bce7523764d35272801 Mon Sep 17 00:00:00 2001
From: Richard Barry <ribarry@amazon.com>
Date: Sun, 8 Dec 2013 06:32:38 +0000
Subject: [PATCH] Minor change to SAM4L_low_power_tick_management.c to ensure
the alarm value cannot be set to zero.
---
.../FreeRTOS_Demo.cproj | 12 ++++++------
.../src/SAM4L_low_power_tick_management.c | 10 ++++++++--
2 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/FreeRTOS_Demo.cproj b/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/FreeRTOS_Demo.cproj
index afaf06514c..44f28a52db 100644
--- a/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/FreeRTOS_Demo.cproj
+++ b/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/FreeRTOS_Demo.cproj
@@ -208,7 +208,7 @@
<armgcc.compiler.optimization.OtherFlags>-fdata-sections</armgcc.compiler.optimization.OtherFlags>
<armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>True</armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>
<armgcc.compiler.warnings.AllWarnings>True</armgcc.compiler.warnings.AllWarnings>
- <armgcc.compiler.miscellaneous.OtherFlags>-std=gnu99 -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.compiler.miscellaneous.OtherFlags>
+ <armgcc.compiler.miscellaneous.OtherFlags>-std=gnu99 -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.compiler.miscellaneous.OtherFlags>
<armgcc.linker.libraries.Libraries>
<ListValues>
<Value>arm_cortexM4l_math</Value>
@@ -223,7 +223,7 @@
</armgcc.linker.libraries.LibrarySearchPaths>
<armgcc.linker.optimization.GarbageCollectUnusedSections>True</armgcc.linker.optimization.GarbageCollectUnusedSections>
<armgcc.linker.miscellaneous.LinkerFlags>-T../src/asf/sam/utils/linker_scripts/sam4l/sam4l4/gcc/flash.ld -Wl,--cref -Wl,--entry=Reset_Handler -mthumb</armgcc.linker.miscellaneous.LinkerFlags>
- <armgcc.assembler.general.AssemblerFlags>-D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.assembler.general.AssemblerFlags>
+ <armgcc.assembler.general.AssemblerFlags>-D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.assembler.general.AssemblerFlags>
<armgcc.assembler.general.IncludePaths>
<ListValues>
<Value>../src/asf/sam/utils/preprocessor</Value>
@@ -252,7 +252,7 @@
<Value>%24(ToolchainDir)\..\..\CMSIS_Atmel\Device\ATMEL\sam4l\include</Value>
</ListValues>
</armgcc.assembler.general.IncludePaths>
- <armgcc.preprocessingassembler.general.AssemblerFlags>-DARM_MATH_CM4=true -DBOARD=SAM4L_EK -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.preprocessingassembler.general.AssemblerFlags>
+ <armgcc.preprocessingassembler.general.AssemblerFlags>-DARM_MATH_CM4=true -DBOARD=SAM4L_EK -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.preprocessingassembler.general.AssemblerFlags>
<armgcc.preprocessingassembler.general.IncludePaths>
<ListValues>
<Value>../src/asf/sam/utils/preprocessor</Value>
@@ -332,7 +332,7 @@
<armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>True</armgcc.compiler.optimization.PrepareFunctionsForGarbageCollection>
<armgcc.compiler.optimization.DebugLevel>Maximum (-g3)</armgcc.compiler.optimization.DebugLevel>
<armgcc.compiler.warnings.AllWarnings>True</armgcc.compiler.warnings.AllWarnings>
- <armgcc.compiler.miscellaneous.OtherFlags>-std=gnu99 -Wmissing-field-initializers -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.compiler.miscellaneous.OtherFlags>
+ <armgcc.compiler.miscellaneous.OtherFlags>-std=gnu99 -Wmissing-field-initializers -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.compiler.miscellaneous.OtherFlags>
<armgcc.linker.libraries.Libraries>
<ListValues>
<Value>libm</Value>
@@ -346,7 +346,7 @@
</armgcc.linker.libraries.LibrarySearchPaths>
<armgcc.linker.optimization.GarbageCollectUnusedSections>True</armgcc.linker.optimization.GarbageCollectUnusedSections>
<armgcc.linker.miscellaneous.LinkerFlags>-T../src/asf/sam/utils/linker_scripts/sam4l/sam4l4/gcc/flash.ld -Wl,--cref -Wl,--entry=Reset_Handler -mthumb</armgcc.linker.miscellaneous.LinkerFlags>
- <armgcc.assembler.general.AssemblerFlags>-D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.assembler.general.AssemblerFlags>
+ <armgcc.assembler.general.AssemblerFlags>-D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.assembler.general.AssemblerFlags>
<armgcc.assembler.general.IncludePaths>
<ListValues>
<Value>../src/asf/sam/utils/preprocessor</Value>
@@ -376,7 +376,7 @@
</ListValues>
</armgcc.assembler.general.IncludePaths>
<armgcc.assembler.debugging.DebugLevel>Default (-g)</armgcc.assembler.debugging.DebugLevel>
- <armgcc.preprocessingassembler.general.AssemblerFlags>-DARM_MATH_CM4=true -DBOARD=SAM4L_EK -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.preprocessingassembler.general.AssemblerFlags>
+ <armgcc.preprocessingassembler.general.AssemblerFlags>-DARM_MATH_CM4=true -DBOARD=SAM4L_EK -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__ -D__ATSAM4LC4C__</armgcc.preprocessingassembler.general.AssemblerFlags>
<armgcc.preprocessingassembler.general.IncludePaths>
<ListValues>
<Value>../src/asf/sam/utils/preprocessor</Value>
diff --git a/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/src/SAM4L_low_power_tick_management.c b/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/src/SAM4L_low_power_tick_management.c
index 694b73d2b1..0f76945a4e 100644
--- a/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/src/SAM4L_low_power_tick_management.c
+++ b/FreeRTOS/Demo/CORTEX_M4_ATSAM4L_Atmel_Studio/src/SAM4L_low_power_tick_management.c
@@ -1,5 +1,5 @@
/*
- FreeRTOS V7.6.0 - Copyright (C) 2013 Real Time Engineers Ltd.
+ FreeRTOS V7.6.0 - Copyright (C) 2013 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
@@ -248,7 +248,7 @@ static void prvEnableAST( void )
/*-----------------------------------------------------------*/
/* Override the default definition of vPortSuppressTicksAndSleep() that is weakly
-defined in the FreeRTOS Cortex-M3 port layet with a version that manages the
+defined in the FreeRTOS Cortex-M3 port layer with a version that manages the
asynchronous timer (AST), as the tick is generated from the low power AST and
not the SysTick as would normally be the case on a Cortex-M. */
void vPortSuppressTicksAndSleep( portTickType xExpectedIdleTime )
@@ -372,6 +372,12 @@ enum sleepmgr_mode xSleepMode;
/* The alarm value is set to whatever fraction of a single tick
period remains. */
ulAlarmValue = ast_read_counter_value( AST ) - ( ulCompleteTickPeriods * ulAlarmValueForOneTick );
+ if( ulAlarmValue == 0 )
+ {
+ /* There is no fraction remaining. */
+ ulAlarmValue = ulAlarmValueForOneTick;
+ ulCompleteTickPeriods++;
+ }
ast_write_alarm0_value( AST, ulAlarmValue );
}