Diff: targets/TARGET_Maxim/TARGET_MAX32620C/mxc/adc.c

Revision:

186:707f6e361f3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32620C/mxc/adc.c	Fri Jun 22 16:45:37 2018 +0100
@@ -0,0 +1,182 @@
+/**
+ * @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: 2017-02-14 18:08:19 -0600 (Tue, 14 Feb 2017) $
+ * $Revision: 26419 $
+ *
+ *************************************************************************** */
+
+
+
+/* **** Includes **** */
+#include "mxc_config.h"
+#include "mxc_assert.h"
+#include "mxc_sys.h"
+#include "adc.h"
+
+/**
+ * @ingroup group_adc
+ * @{
+ */
+
+/* **** 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;
+}
+
+/** @} */