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Diff: targets/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c
- Revision:
- 149:156823d33999
- Parent:
- 147:30b64687e01f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_ONSEMI/TARGET_NCS36510/analogin_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,192 @@
+/**
+ ******************************************************************************
+ * @file adc_sar.c
+ * @brief Implementation of a SAR ADC driver
+ * @internal
+ * @author ON Semiconductor
+ * $Rev:
+ * $Date:
+ ******************************************************************************
+ * Copyright 2016 Semiconductor Components Industries LLC (d/b/a ON Semiconductor).
+ * All rights reserved. This software and/or documentation is licensed by ON Semiconductor
+ * under limited terms and conditions. The terms and conditions pertaining to the software
+ * and/or documentation are available at http://www.onsemi.com/site/pdf/ONSEMI_T&C.pdf
+ * (ON Semiconductor Standard Terms and Conditions of Sale, Section 8 Software) and
+ * if applicable the software license agreement. Do not use this software and/or
+ * documentation unless you have carefully read and you agree to the limited terms and
+ * conditions. By using this software and/or documentation, you agree to the limited
+ * terms and conditions.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED
+ * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
+ * ON SEMICONDUCTOR SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,
+ * INCIDENTAL, OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
+ * @endinternal
+ *
+ * @ingroup adc_sar
+ *
+ * @details
+ * <p>
+ * </p>
+ *
+ */
+
+#include "device.h"
+#include "analogin_api.h"
+#include "PeripheralPins.h"
+#include "mbed_assert.h"
+#include "clock.h"
+#include "adc_sar.h"
+
+#if DEVICE_ANALOGIN
+
+/**
+ * \defgroup hal_analogin Analogin hal functions
+ * @{
+ */
+
+/** Initialize the analogin peripheral
+ *
+ * Configures the pin used by analogin.
+ * @param obj The analogin object to initialize
+ * @param pin The analogin pin name
+ */
+void analogin_init(analogin_t *obj, PinName pin)
+{
+ CLOCK_ENABLE(CLOCK_ADC);
+ ADCName adc;
+ uint8_t adc_pin = 0;
+
+ adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+ MBED_ASSERT(adc != (ADCName)NC);
+
+ obj->adcReg = (AdcReg_pt)adc;
+ obj->pin = pin;
+ obj->pinFlag = 1;
+
+ switch (pin) {
+ case A0:
+ adc_pin=0;
+ break;
+ case A1:
+ adc_pin = 1;
+ break;
+ case A2:
+ adc_pin = 2;
+ break;
+ case A3:
+ adc_pin = 3;
+ break;
+ default:
+ break;
+ }
+
+ /* If no config parameters are passed on; assume default value */
+ if (obj->adcConf == Null) {
+ /* Single sample, absolute conversion, scale = 1 */
+ obj->adcReg->CONTROL.WORD = ((0 << ADC_CONTROL_MODE_BIT_POS) |
+ (1 << ADC_CONTROL_MEASTYPE_BIT_POS) |
+ (1 << ADC_CONTROL_INPUTSCALE_BIT_POS) |
+ (((uint8_t)adc_pin) << ADC_CONTROL_MEAS_CH_BIT_POS));
+
+ /* Prescaler enabled; set to 7 */
+ obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) |
+ (7 << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */
+
+ obj->adcReg->DELAY.WORD = ((0x34 << ADC_DELAY_SAMPLE_RATE_BIT_POS) | /** 25 uS Sets the sample rate in units of PCLKperiod * (Prescale + 1). */
+ (0x05 << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */
+ (0x1A << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */
+
+ obj->adcReg->IR = 0; /** No interrupt generated */
+ } else {
+ obj->adcConf->convCh = adc_pin;
+
+ /* ADC register settings */
+ if((obj->adcConf->measurementType) == ADC_RELATIVE_MEAS) {
+ obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) |
+ (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) |
+ (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) |
+ (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS) |
+ (obj->adcConf->referenceCh << ADC_CONTROL_REF_CH_BIT_POS));
+ } else {
+ obj->adcReg->CONTROL.WORD = ((obj->adcConf->mode << ADC_CONTROL_MODE_BIT_POS) |
+ (obj->adcConf->measurementType << ADC_CONTROL_MEASTYPE_BIT_POS) |
+ (obj->adcConf->inputScale << ADC_CONTROL_INPUTSCALE_BIT_POS) |
+ (obj->adcConf->convCh << ADC_CONTROL_MEAS_CH_BIT_POS));
+ }
+
+ obj->adcReg->PRESCALE.WORD = ((True << ADC_PRESCALE_EN_BIT_POS) |
+ (obj->adcConf->PrescaleVal << ADC_PRESCALE_VAL_BIT_POS)); /* ADC clock = 32MHz/(Prescale + 1) */
+
+ obj->adcReg->DELAY.WORD = ((obj->adcConf->samplingRate << ADC_DELAY_SAMPLE_RATE_BIT_POS) | /** 25 uS Sets the sample rate in units of PCLKperiod * (Prescale + 1). */
+ (obj->adcConf->WarmUpTime << ADC_DELAY_WARMUP_BIT_POS) | /** 12.5 uS Sets the measure time in units of PCLKperiod * (Prescale + 1). */
+ (obj->adcConf->samplingTime << ADC_DELAY_SAMPLE_TIME_BIT_POS)); /** 2.5 uS Sets the warm-up time in units of PCLKperiod * (Prescale + 1). */
+
+ obj->adcReg->IR = obj->adcConf->interruptConfig; /** Interrupt setting */
+ }
+
+ /* Enable interrupt */
+ NVIC_ClearPendingIRQ(Adc_IRQn);
+ NVIC_EnableIRQ(Adc_IRQn);
+}
+
+/** Read the input voltage, represented as a float in the range [0.0, 1.0]
+ *
+ * @param obj The analogin object
+ * @return A floating value representing the current input voltage
+ */
+float analogin_read(analogin_t *obj)
+{
+ float retVal = 0.0;
+ uint16_t value = analogin_read_u16(obj);
+ retVal = (float)value * (1.0f / (float)0x03FF);
+ return(retVal);
+}
+
+/** Read the value from analogin pin, represented as an unsigned 16bit value
+ *
+ * @param obj The analogin object
+ * @return An unsigned 16bit value representing the current input voltage
+ */
+uint16_t analogin_read_u16(analogin_t *obj)
+{
+ uint16_t adcData = 0;
+ uint8_t adc_pin = 0;
+
+ CLOCK_ENABLE(CLOCK_ADC);
+
+ if (obj->pinFlag) {
+ switch (obj->pin) {
+ case A0:
+ adc_pin=0;
+ break;
+ case A1:
+ adc_pin = 1;
+ break;
+ case A2:
+ adc_pin = 2;
+ break;
+ case A3:
+ adc_pin = 3;
+ break;
+ default:
+ break;
+ }
+
+ /* Re initialize the pin configured for ADC read */
+ obj->adcReg->CONTROL.BITS.CONV_CH = adc_pin;
+ }
+
+ obj->adcReg->CONTROL.BITS.START_CONV=1; /* Start The Conversion */
+
+ while((uint32_t)(obj->adcReg->STATUS)!=(uint32_t)1) {
+ }
+ adcData =(uint16_t)(obj->adcReg->DATA);
+ CLOCK_DISABLE(CLOCK_ADC);
+
+ return(adcData);
+}
+
+#endif // DEVICE_ANALOGIN
+