From 44b979ac3dc53b29ee8176517b7d9a10935630c0 Mon Sep 17 00:00:00 2001 From: Yuval Adam Date: Mon, 29 Oct 2012 21:36:23 +0200 Subject: Initial code --- driverlib/comp.c | 451 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 451 insertions(+) create mode 100644 driverlib/comp.c (limited to 'driverlib/comp.c') diff --git a/driverlib/comp.c b/driverlib/comp.c new file mode 100644 index 0000000..ca1e05a --- /dev/null +++ b/driverlib/comp.c @@ -0,0 +1,451 @@ +//***************************************************************************** +// +// comp.c - Driver for the analog comparator. +// +// Copyright (c) 2005-2012 Texas Instruments Incorporated. All rights reserved. +// Software License Agreement +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions +// are met: +// +// Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// +// Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the +// distribution. +// +// Neither the name of Texas Instruments Incorporated nor the names of +// its contributors may be used to endorse or promote products derived +// from this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +// +// This is part of revision 9453 of the Stellaris Peripheral Driver Library. +// +//***************************************************************************** + +//***************************************************************************** +// +//! \addtogroup comp_api +//! @{ +// +//***************************************************************************** + +#include "inc/hw_comp.h" +#include "inc/hw_ints.h" +#include "inc/hw_memmap.h" +#include "inc/hw_types.h" +#include "driverlib/comp.h" +#include "driverlib/debug.h" +#include "driverlib/interrupt.h" + +//***************************************************************************** +// +//! Configures a comparator. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator to configure. +//! \param ulConfig is the configuration of the comparator. +//! +//! This function configures a comparator. The \e ulConfig parameter is the +//! result of a logical OR operation between the \b COMP_TRIG_xxx, +//! \b COMP_INT_xxx, \b COMP_ASRCP_xxx, and \b COMP_OUTPUT_xxx values. +//! +//! The \b COMP_TRIG_xxx term can take on the following values: +//! +//! - \b COMP_TRIG_NONE to have no trigger to the ADC. +//! - \b COMP_TRIG_HIGH to trigger the ADC when the comparator output is high. +//! - \b COMP_TRIG_LOW to trigger the ADC when the comparator output is low. +//! - \b COMP_TRIG_FALL to trigger the ADC when the comparator output goes low. +//! - \b COMP_TRIG_RISE to trigger the ADC when the comparator output goes +//! high. +//! - \b COMP_TRIG_BOTH to trigger the ADC when the comparator output goes low +//! or high. +//! +//! The \b COMP_INT_xxx term can take on the following values: +//! +//! - \b COMP_INT_HIGH to generate an interrupt when the comparator output is +//! high. +//! - \b COMP_INT_LOW to generate an interrupt when the comparator output is +//! low. +//! - \b COMP_INT_FALL to generate an interrupt when the comparator output goes +//! low. +//! - \b COMP_INT_RISE to generate an interrupt when the comparator output goes +//! high. +//! - \b COMP_INT_BOTH to generate an interrupt when the comparator output goes +//! low or high. +//! +//! The \b COMP_ASRCP_xxx term can take on the following values: +//! +//! - \b COMP_ASRCP_PIN to use the dedicated Comp+ pin as the reference +//! voltage. +//! - \b COMP_ASRCP_PIN0 to use the Comp0+ pin as the reference voltage (this +//! the same as \b COMP_ASRCP_PIN for the comparator 0). +//! - \b COMP_ASRCP_REF to use the internally generated voltage as the +//! reference voltage. +//! +//! The \b COMP_OUTPUT_xxx term can take on the following values: +//! +//! - \b COMP_OUTPUT_NORMAL to enable a non-inverted output from the comparator +//! to a device pin. +//! - \b COMP_OUTPUT_INVERT to enable an inverted output from the comparator to +//! a device pin. +//! - \b COMP_OUTPUT_NONE is deprecated and behaves the same as +//! \b COMP_OUTPUT_NORMAL. +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorConfigure(unsigned long ulBase, unsigned long ulComp, + unsigned long ulConfig) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Configure this comparator. + // + HWREG(ulBase + (ulComp * 0x20) + COMP_O_ACCTL0) = ulConfig; +} + +//***************************************************************************** +// +//! Sets the internal reference voltage. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulRef is the desired reference voltage. +//! +//! This function sets the internal reference voltage value. The voltage is +//! specified as one of the following values: +//! +//! - \b COMP_REF_OFF to turn off the reference voltage +//! - \b COMP_REF_0V to set the reference voltage to 0 V +//! - \b COMP_REF_0_1375V to set the reference voltage to 0.1375 V +//! - \b COMP_REF_0_275V to set the reference voltage to 0.275 V +//! - \b COMP_REF_0_4125V to set the reference voltage to 0.4125 V +//! - \b COMP_REF_0_55V to set the reference voltage to 0.55 V +//! - \b COMP_REF_0_6875V to set the reference voltage to 0.6875 V +//! - \b COMP_REF_0_825V to set the reference voltage to 0.825 V +//! - \b COMP_REF_0_928125V to set the reference voltage to 0.928125 V +//! - \b COMP_REF_0_9625V to set the reference voltage to 0.9625 V +//! - \b COMP_REF_1_03125V to set the reference voltage to 1.03125 V +//! - \b COMP_REF_1_134375V to set the reference voltage to 1.134375 V +//! - \b COMP_REF_1_1V to set the reference voltage to 1.1 V +//! - \b COMP_REF_1_2375V to set the reference voltage to 1.2375 V +//! - \b COMP_REF_1_340625V to set the reference voltage to 1.340625 V +//! - \b COMP_REF_1_375V to set the reference voltage to 1.375 V +//! - \b COMP_REF_1_44375V to set the reference voltage to 1.44375 V +//! - \b COMP_REF_1_5125V to set the reference voltage to 1.5125 V +//! - \b COMP_REF_1_546875V to set the reference voltage to 1.546875 V +//! - \b COMP_REF_1_65V to set the reference voltage to 1.65 V +//! - \b COMP_REF_1_753125V to set the reference voltage to 1.753125 V +//! - \b COMP_REF_1_7875V to set the reference voltage to 1.7875 V +//! - \b COMP_REF_1_85625V to set the reference voltage to 1.85625 V +//! - \b COMP_REF_1_925V to set the reference voltage to 1.925 V +//! - \b COMP_REF_1_959375V to set the reference voltage to 1.959375 V +//! - \b COMP_REF_2_0625V to set the reference voltage to 2.0625 V +//! - \b COMP_REF_2_165625V to set the reference voltage to 2.165625 V +//! - \b COMP_REF_2_26875V to set the reference voltage to 2.26875 V +//! - \b COMP_REF_2_371875V to set the reference voltage to 2.371875 V +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorRefSet(unsigned long ulBase, unsigned long ulRef) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + + // + // Set the voltage reference voltage as requested. + // + HWREG(ulBase + COMP_O_ACREFCTL) = ulRef; +} + +//***************************************************************************** +// +//! Gets the current comparator output value. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! +//! This function retrieves the current value of the comparator output. +//! +//! \return Returns \b true if the comparator output is high and \b false if +//! the comparator output is low. +// +//***************************************************************************** +tBoolean +ComparatorValueGet(unsigned long ulBase, unsigned long ulComp) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Return the appropriate value based on the comparator's present output + // value. + // + if(HWREG(ulBase + (ulComp * 0x20) + COMP_O_ACSTAT0) & COMP_ACSTAT0_OVAL) + { + return(true); + } + else + { + return(false); + } +} + +//***************************************************************************** +// +//! Registers an interrupt handler for the comparator interrupt. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! \param pfnHandler is a pointer to the function to be called when the +//! comparator interrupt occurs. +//! +//! This function sets the handler to be called when the comparator interrupt occurs +//! and enables the interrupt in the interrupt controller. It is the interrupt +//! handler's responsibility to clear the interrupt source via +//! ComparatorIntClear(). +//! +//! \sa IntRegister() for important information about registering interrupt +//! handlers. +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorIntRegister(unsigned long ulBase, unsigned long ulComp, + void (*pfnHandler)(void)) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Register the interrupt handler, returning an error if an error occurs. + // + IntRegister(INT_COMP0 + ulComp, pfnHandler); + + // + // Enable the interrupt in the interrupt controller. + // + IntEnable(INT_COMP0 + ulComp); + + // + // Enable the comparator interrupt. + // + HWREG(ulBase + COMP_O_ACINTEN) |= 1 << ulComp; +} + +//***************************************************************************** +// +//! Unregisters an interrupt handler for a comparator interrupt. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! +//! This function clears the handler to be called when a comparator interrupt +//! occurs. This function also masks off the interrupt in the interrupt controller +//! so that the interrupt handler no longer is called. +//! +//! \sa IntRegister() for important information about registering interrupt +//! handlers. +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorIntUnregister(unsigned long ulBase, unsigned long ulComp) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Disable the comparator interrupt. + // + HWREG(ulBase + COMP_O_ACINTEN) &= ~(1 << ulComp); + + // + // Disable the interrupt in the interrupt controller. + // + IntDisable(INT_COMP0 + ulComp); + + // + // Unregister the interrupt handler. + // + IntUnregister(INT_COMP0 + ulComp); +} + +//***************************************************************************** +// +//! Enables the comparator interrupt. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! +//! This function enables generation of an interrupt from the specified +//! comparator. Only enabled comparator interrupts can be reflected +//! to the processor. +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorIntEnable(unsigned long ulBase, unsigned long ulComp) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Enable the comparator interrupt. + // + HWREG(ulBase + COMP_O_ACINTEN) |= 1 << ulComp; +} + +//***************************************************************************** +// +//! Disables the comparator interrupt. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! +//! This function disables generation of an interrupt from the specified +//! comparator. Only enabled comparator interrupts can be reflected +//! to the processor. +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorIntDisable(unsigned long ulBase, unsigned long ulComp) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Disable the comparator interrupt. + // + HWREG(ulBase + COMP_O_ACINTEN) &= ~(1 << ulComp); +} + +//***************************************************************************** +// +//! Gets the current interrupt status. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! \param bMasked is \b false if the raw interrupt status is required and +//! \b true if the masked interrupt status is required. +//! +//! This function returns the interrupt status for the comparator. Either the raw or +//! the masked interrupt status can be returned. +//! +//! \return \b true if the interrupt is asserted and \b false if it is not +//! asserted. +// +//***************************************************************************** +tBoolean +ComparatorIntStatus(unsigned long ulBase, unsigned long ulComp, + tBoolean bMasked) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Return either the interrupt status or the raw interrupt status as + // requested. + // + if(bMasked) + { + return(((HWREG(ulBase + COMP_O_ACMIS) >> ulComp) & 1) ? true : false); + } + else + { + return(((HWREG(ulBase + COMP_O_ACRIS) >> ulComp) & 1) ? true : false); + } +} + +//***************************************************************************** +// +//! Clears a comparator interrupt. +//! +//! \param ulBase is the base address of the comparator module. +//! \param ulComp is the index of the comparator. +//! +//! The comparator interrupt is cleared, so that it no longer asserts. This +//! fucntion must be called in the interrupt handler to keep the handler from +//! being called again immediately upon exit. Note that for a level-triggered +//! interrupt, the interrupt cannot be cleared until it stops asserting. +//! +//! \note Because there is a write buffer in the Cortex-M processor, it may +//! take several clock cycles before the interrupt source is actually cleared. +//! Therefore, it is recommended that the interrupt source be cleared early in +//! the interrupt handler (as opposed to the very last action) to avoid +//! returning from the interrupt handler before the interrupt source is +//! actually cleared. Failure to do so may result in the interrupt handler +//! being immediately reentered (because the interrupt controller still sees +//! the interrupt source asserted). +//! +//! \return None. +// +//***************************************************************************** +void +ComparatorIntClear(unsigned long ulBase, unsigned long ulComp) +{ + // + // Check the arguments. + // + ASSERT(ulBase == COMP_BASE); + ASSERT(ulComp < 3); + + // + // Clear the interrupt. + // + HWREG(ulBase + COMP_O_ACMIS) = 1 << ulComp; +} + +//***************************************************************************** +// +// Close the Doxygen group. +//! @} +// +//***************************************************************************** -- cgit v1.3.1