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targets/TARGET_Maxim/TARGET_MAX32630/mxc/adc.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 157:ff67d9f36b67
File content as of revision 178:c26431f84b0d:
/** * @file * @brief This file contains the function implementations for the Analog to * Digital Converter (ADC) peripheral module. */ /* **************************************************************************** * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. * * $Date: 2016-09-09 12:50:50 -0500 (Fri, 09 Sep 2016) $ * $Revision: 24349 $ * *************************************************************************** */ /** * @ingroup adc * @{ */ /* **** Includes **** */ #include "mxc_config.h" #include "mxc_assert.h" #include "mxc_sys.h" #include "adc.h" /* **** Definitions **** */ /* **** Globals **** */ /* **** Functions **** */ /* ************************************************************************* */ int ADC_Init(void) { int err; if ((err = SYS_ADC_Init()) != E_NO_ERROR) { return err; } /* Wipe previous configuration */ MXC_ADC->intr = 0; /* Clear all ADC interrupt flags (W1C) */ MXC_ADC->intr = MXC_ADC->intr; /* Enable done interrupt */ MXC_ADC->intr = MXC_F_ADC_INTR_ADC_DONE_IE; /* Power up the ADC */ MXC_ADC->ctrl = (MXC_F_ADC_CTRL_ADC_PU | MXC_F_ADC_CTRL_ADC_CLK_EN | MXC_F_ADC_CTRL_BUF_PU | MXC_F_ADC_CTRL_ADC_REFBUF_PU | MXC_F_ADC_CTRL_ADC_CHGPUMP_PU); return E_NO_ERROR; } /* ************************************************************************* */ void ADC_StartConvert(mxc_adc_chsel_t channel, unsigned int adc_scale, unsigned int bypass) { uint32_t ctrl_tmp; /* Clear the ADC done flag */ ADC_ClearFlags(MXC_F_ADC_INTR_ADC_DONE_IF); /* Insert channel selection */ ctrl_tmp = MXC_ADC->ctrl; ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_CHSEL); ctrl_tmp |= ((channel << MXC_F_ADC_CTRL_ADC_CHSEL_POS) & MXC_F_ADC_CTRL_ADC_CHSEL); /* Clear channel configuration */ ctrl_tmp &= ~(MXC_F_ADC_CTRL_ADC_REFSCL | MXC_F_ADC_CTRL_ADC_SCALE | MXC_F_ADC_CTRL_BUF_BYPASS); /* ADC reference scaling must be set for all channels but two*/ if ((channel != ADC_CH_VDD18) && (channel != ADC_CH_VDD12)) { ctrl_tmp |= MXC_F_ADC_CTRL_ADC_REFSCL; } /* Finalize user-requested channel configuration */ if (adc_scale || channel > ADC_CH_3) { ctrl_tmp |= MXC_F_ADC_CTRL_ADC_SCALE; } if (bypass) { ctrl_tmp |= MXC_F_ADC_CTRL_BUF_BYPASS; } /* Write this configuration */ MXC_ADC->ctrl = ctrl_tmp; /* Start conversion */ MXC_ADC->ctrl |= MXC_F_ADC_CTRL_CPU_ADC_START; } /* ************************************************************************* */ int ADC_GetData(uint16_t *outdata) { /* See if a conversion is in process */ if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_ACTIVE) { /* Wait for conversion to complete */ while ((MXC_ADC->intr & MXC_F_ADC_INTR_ADC_DONE_IF) == 0); } /* Read 32-bit value and truncate to 16-bit for output depending on data align bit*/ if((MXC_ADC->ctrl & MXC_F_ADC_CTRL_ADC_DATAALIGN) == 0) *outdata = (uint16_t)(MXC_ADC->data); /* LSB justified */ else *outdata = (uint16_t)(MXC_ADC->data >> 6); /* MSB justified */ /* Check for overflow */ if (MXC_ADC->status & MXC_F_ADC_STATUS_ADC_OVERFLOW) { return E_OVERFLOW; } return E_NO_ERROR; } /* ************************************************************************* */ int ADC_SetLimit(mxc_adc_limitsel_t unit, mxc_adc_chsel_t channel, unsigned int low_enable, unsigned int low_limit, unsigned int high_enable, unsigned int high_limit) { /* Check args */ if ((unit >= ADC_LIMIT_MAX) || (channel >= ADC_CH_MAX)) return E_BAD_PARAM; /* set channel using the limit */ MXC_ADC->limit[unit] = ((channel << MXC_F_ADC_LIMIT0_CH_SEL_POS) & MXC_F_ADC_LIMIT0_CH_SEL); /* enable/disable the limit*/ if (low_enable) { MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN | ((low_limit << MXC_F_ADC_LIMIT0_CH_LO_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_LO_LIMIT); } else{ MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_LO_LIMIT_EN; } if (high_enable) { MXC_ADC->limit[unit] |= MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN | ((high_limit << MXC_F_ADC_LIMIT0_CH_HI_LIMIT_POS) & MXC_F_ADC_LIMIT0_CH_HI_LIMIT); } else{ MXC_ADC->limit[unit] &= ~MXC_F_ADC_LIMIT0_CH_HI_LIMIT_EN; } return E_NO_ERROR; } /**@} end of group adc */