Diff: targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/analogin_api.c

Revision:

320:be04b2b1e3f2

Parent:

267:8673334f2cbe

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_MCU_K64F/analogin_api.c	Thu Sep 11 17:00:08 2014 +0100
@@ -0,0 +1,75 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "mbed_assert.h"
+#include "analogin_api.h"
+
+#if DEVICE_ANALOGIN
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralNames.h"
+#include "fsl_adc_hal.h"
+#include "fsl_clock_manager.h"
+#include "PeripheralPins.h"
+
+#define MAX_FADC 6000000
+
+void analogin_init(analogin_t *obj, PinName pin) {
+    obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+    MBED_ASSERT(obj->adc != (ADCName)NC);
+
+    uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT;
+
+    clock_manager_set_gate(kClockModuleADC, instance, true);
+
+    uint32_t bus_clock;
+    clock_manager_get_frequency(kBusClock, &bus_clock);
+    uint32_t clkdiv;
+    for (clkdiv = 0; clkdiv < 4; clkdiv++) {
+        if ((bus_clock >> clkdiv) <= MAX_FADC)
+            break;
+    }
+    if (clkdiv == 4) {
+        clkdiv = 0x7; //Set max div
+    }
+    /* adc is enabled/triggered when reading. */
+    adc_hal_set_clock_source_mode(instance, (adc_clock_source_mode_t)(clkdiv >> 2));
+    adc_hal_set_clock_divider_mode(instance, (adc_clock_divider_mode_t)(clkdiv & 0x3));
+    adc_hal_set_reference_voltage_mode(instance, kAdcVoltageVref);
+    adc_hal_set_resolution_mode(instance, kAdcSingleDiff16);
+    adc_hal_configure_continuous_conversion(instance, false);
+    adc_hal_configure_hw_trigger(instance, false); /* sw trigger */
+    adc_hal_configure_hw_average(instance, true);
+    adc_hal_set_hw_average_mode(instance, kAdcHwAverageCount4);
+    adc_hal_set_group_mux(instance, kAdcChannelMuxB); /* only B channels are avail */
+
+    pinmap_pinout(pin, PinMap_ADC);
+}
+
+uint16_t analogin_read_u16(analogin_t *obj) {
+    uint32_t instance = obj->adc >> ADC_INSTANCE_SHIFT;
+    /* sw trigger (SC1A) */
+    adc_hal_enable(instance, 0, (adc_channel_mode_t)(obj->adc & 0xF), false);
+    while (!adc_hal_is_conversion_completed(instance, 0));
+    return adc_hal_get_conversion_value(instance, 0);
+}
+
+float analogin_read(analogin_t *obj) {
+    uint16_t value = analogin_read_u16(obj);
+    return (float)value * (1.0f / (float)0xFFFF);
+}
+
+#endif