210 lines
6.3 KiB
C
210 lines
6.3 KiB
C
/*
|
|
* @brief LPC11u6x ADC driver
|
|
*
|
|
* @note
|
|
* Copyright(C) NXP Semiconductors, 2013
|
|
* All rights reserved.
|
|
*
|
|
* @par
|
|
* Software that is described herein is for illustrative purposes only
|
|
* which provides customers with programming information regarding the
|
|
* LPC products. This software is supplied "AS IS" without any warranties of
|
|
* any kind, and NXP Semiconductors and its licensor disclaim any and
|
|
* all warranties, express or implied, including all implied warranties of
|
|
* merchantability, fitness for a particular purpose and non-infringement of
|
|
* intellectual property rights. NXP Semiconductors assumes no responsibility
|
|
* or liability for the use of the software, conveys no license or rights under any
|
|
* patent, copyright, mask work right, or any other intellectual property rights in
|
|
* or to any products. NXP Semiconductors reserves the right to make changes
|
|
* in the software without notification. NXP Semiconductors also makes no
|
|
* representation or warranty that such application will be suitable for the
|
|
* specified use without further testing or modification.
|
|
*
|
|
* @par
|
|
* Permission to use, copy, modify, and distribute this software and its
|
|
* documentation is hereby granted, under NXP Semiconductors' and its
|
|
* licensor's relevant copyrights in the software, without fee, provided that it
|
|
* is used in conjunction with NXP Semiconductors microcontrollers. This
|
|
* copyright, permission, and disclaimer notice must appear in all copies of
|
|
* this code.
|
|
*/
|
|
|
|
#include "chip.h"
|
|
|
|
/*****************************************************************************
|
|
* Private types/enumerations/variables
|
|
****************************************************************************/
|
|
|
|
/*****************************************************************************
|
|
* Public types/enumerations/variables
|
|
****************************************************************************/
|
|
|
|
/*****************************************************************************
|
|
* Private functions
|
|
****************************************************************************/
|
|
|
|
/* Set ADC interrupt bits (safe) */
|
|
void Chip_ADC_SetIntBits(LPC_ADC_T *pADC, uint32_t intMask)
|
|
{
|
|
uint32_t temp;
|
|
|
|
/* Read and write values may not be the same, write 0 to
|
|
undefined bits */
|
|
temp = pADC->INTEN & 0x07FFFFFF;
|
|
|
|
pADC->INTEN = temp | intMask;
|
|
}
|
|
|
|
/* Clear ADC interrupt bits (safe) */
|
|
void Chip_ADC_ClearIntBits(LPC_ADC_T *pADC, uint32_t intMask)
|
|
{
|
|
uint32_t temp;
|
|
|
|
/* Read and write values may not be the same, write 0 to
|
|
undefined bits */
|
|
temp = pADC->INTEN & 0x07FFFFFF;
|
|
|
|
pADC->INTEN = temp & ~intMask;
|
|
}
|
|
|
|
/* Set ADC threshold selection bits (safe) */
|
|
void Chip_ADC_SetTHRSELBits(LPC_ADC_T *pADC, uint32_t mask)
|
|
{
|
|
uint32_t temp;
|
|
|
|
/* Read and write values may not be the same, write 0 to
|
|
undefined bits */
|
|
temp = pADC->CHAN_THRSEL & 0x00000FFF;
|
|
|
|
pADC->CHAN_THRSEL = temp | mask;
|
|
}
|
|
|
|
/* Clear ADC threshold selection bits (safe) */
|
|
void Chip_ADC_ClearTHRSELBits(LPC_ADC_T *pADC, uint32_t mask)
|
|
{
|
|
uint32_t temp;
|
|
|
|
/* Read and write values may not be the same, write 0 to
|
|
undefined bits */
|
|
temp = pADC->CHAN_THRSEL & 0x00000FFF;
|
|
|
|
pADC->CHAN_THRSEL = temp & ~mask;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* Public functions
|
|
****************************************************************************/
|
|
|
|
/* Initialize the ADC peripheral */
|
|
void Chip_ADC_Init(LPC_ADC_T *pADC, uint32_t flags)
|
|
{
|
|
/* Power up ADC and enable ADC base clock */
|
|
Chip_SYSCTL_PowerUp(SYSCTL_POWERDOWN_ADC_PD);
|
|
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_ADC);
|
|
|
|
/* Disable ADC interrupts */
|
|
pADC->INTEN = 0;
|
|
|
|
/* Set ADC control options */
|
|
pADC->CTRL = flags;
|
|
}
|
|
|
|
/* Start ADC calibration */
|
|
void Chip_ADC_StartCalibration(LPC_ADC_T *pADC)
|
|
{
|
|
uint32_t save_ADC_CTRL;
|
|
|
|
save_ADC_CTRL = pADC->CTRL;
|
|
Chip_ADC_SetClockRate(LPC_ADC, ADC_CALIBRATE_RATE);
|
|
|
|
pADC->CTRL = (pADC->CTRL | ADC_CR_CALMODEBIT) & ~ADC_CR_LPWRMODEBIT;
|
|
}
|
|
|
|
/**
|
|
* @brief Start ADC calibration
|
|
* @param pADC : The base of ADC peripheral on the chip
|
|
* @return TRUE if calibration is complete, otherwise FALSE.
|
|
*/
|
|
bool Chip_ADC_IsCalibrationDone(LPC_ADC_T *pADC)
|
|
{
|
|
return (bool) ((pADC->CTRL & ADC_CR_CALMODEBIT) == 0);
|
|
}
|
|
|
|
|
|
/* Shutdown ADC */
|
|
void Chip_ADC_DeInit(LPC_ADC_T *pADC)
|
|
{
|
|
pADC->INTEN = 0;
|
|
pADC->CTRL = 0;
|
|
|
|
/* Stop ADC clock and then power down ADC */
|
|
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_ADC);
|
|
Chip_SYSCTL_PowerDown(SYSCTL_POWERDOWN_ADC_PD);
|
|
}
|
|
|
|
/* Set ADC clock rate */
|
|
void Chip_ADC_SetClockRate(LPC_ADC_T *pADC, uint32_t rate)
|
|
{
|
|
Chip_ADC_SetDivider(pADC, ((Chip_Clock_GetSystemClockRate() + (rate>>2)) / rate) -1);
|
|
}
|
|
|
|
/* Helper function for safely setting ADC sequencer register bits */
|
|
void Chip_ADC_SetSequencerBits(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex, uint32_t bits)
|
|
{
|
|
uint32_t temp;
|
|
|
|
/* Read sequencer register and mask off bits 20..25 */
|
|
temp = pADC->SEQ_CTRL[seqIndex] & ~(0x3F << 20);
|
|
|
|
/* OR in passed bits */
|
|
pADC->SEQ_CTRL[seqIndex] = temp | bits;
|
|
}
|
|
|
|
/* Helper function for safely clearing ADC sequencer register bits */
|
|
void Chip_ADC_ClearSequencerBits(LPC_ADC_T *pADC, ADC_SEQ_IDX_T seqIndex, uint32_t bits)
|
|
{
|
|
uint32_t temp;
|
|
|
|
/* Read sequencer register and mask off bits 20..25 */
|
|
temp = pADC->SEQ_CTRL[seqIndex] & ~(0x3F << 20);
|
|
|
|
/* OR in passed bits */
|
|
pADC->SEQ_CTRL[seqIndex] = temp & ~bits;
|
|
}
|
|
|
|
/* Enable interrupts in ADC (sequencers A/B and overrun) */
|
|
void Chip_ADC_EnableInt(LPC_ADC_T *pADC, uint32_t intMask)
|
|
{
|
|
Chip_ADC_SetIntBits(pADC, intMask);
|
|
}
|
|
|
|
/* Disable interrupts in ADC (sequencers A/B and overrun) */
|
|
void Chip_ADC_DisableInt(LPC_ADC_T *pADC, uint32_t intMask)
|
|
{
|
|
Chip_ADC_ClearIntBits(pADC, intMask);
|
|
}
|
|
|
|
/* Enable a threshold event interrupt in ADC */
|
|
void Chip_ADC_SetThresholdInt(LPC_ADC_T *pADC, uint8_t ch, ADC_INTEN_THCMP_T thInt)
|
|
{
|
|
int shiftIndex = 3 + (ch * 2);
|
|
|
|
/* Clear current bits first */
|
|
Chip_ADC_ClearIntBits(pADC, (ADC_INTEN_CMP_MASK << shiftIndex));
|
|
|
|
/* Set new threshold interrupt type */
|
|
Chip_ADC_SetIntBits(pADC, ((uint32_t) thInt << shiftIndex));
|
|
}
|
|
|
|
/* Select threshold 0 values for comparison for selected channels */
|
|
void Chip_ADC_SelectTH0Channels(LPC_ADC_T *pADC, uint32_t channels)
|
|
{
|
|
Chip_ADC_ClearTHRSELBits(pADC, channels);
|
|
}
|
|
|
|
/* Select threshold 1 value for comparison for selected channels */
|
|
void Chip_ADC_SelectTH1Channels(LPC_ADC_T *pADC, uint32_t channels)
|
|
{
|
|
Chip_ADC_SetTHRSELBits(pADC, channels);
|
|
}
|