Diff: targets/TARGET_Maxim/TARGET_MAX32625/mxc/adc.c

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/adc.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,178 @@
+/**
+ * @file adc.c
+ * @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: 2016-08-02 13:32:46 -0500 (Tue, 02 Aug 2016) $
+ * $Revision: 23893 $
+ *
+ *************************************************************************** */
+
+/**
+ * @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 */