Diff: targets/hal/TARGET_RENESAS/TARGET_VK_RZ_A1H/analogin_api.c

Revision:

119:3921aeca8633

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_RENESAS/TARGET_VK_RZ_A1H/analogin_api.c	Fri Apr 29 01:15:11 2016 +0100
@@ -0,0 +1,133 @@
+/* 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"
+
+#include "cmsis.h"
+#include "pinmap.h"
+
+#include "adc_iodefine.h"
+#include "cpg_iodefine.h"
+
+#define ANALOGIN_MEDIAN_FILTER      0
+
+#ifdef MAX_PERI
+static const PinMap PinMap_ADC[] = {
+    {P1_8,  AN0, 1},
+    {P1_9,  AN1, 1},
+    {P1_10, AN2, 1},
+    {P1_11, AN3, 1},
+    {P1_12, AN4, 1},
+    {P1_13, AN5, 1},
+    {P1_14, AN6, 1},
+    {P1_15, AN7, 1},
+    {NC,    NC,  0}
+};
+#else
+static const PinMap PinMap_ADC[] = {
+    {P1_8,  AN0, 1},
+    {P1_9,  AN1, 1},
+    {P1_10, AN2, 1},
+    {P1_11, AN3, 1},
+    {P1_12, AN4, 1},
+    {P1_13, AN5, 1},
+    {P1_15, AN7, 1},
+    {NC,    NC,  0}
+};
+#endif
+
+static volatile uint16_t *ADCDR[] = {
+    &ADCADDRA,
+    &ADCADDRB,
+    &ADCADDRC,
+    &ADCADDRD,
+    &ADCADDRE,
+    &ADCADDRF,
+    &ADCADDRG,
+    &ADCADDRH,
+};
+
+void analogin_init(analogin_t *obj, PinName pin) {
+    obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+    MBED_ASSERT(obj->adc != (ADCName)NC);
+
+    CPGSTBCR3 &= ~(1 << 1);
+    CPGSTBCR6 &= ~(1 << 7);
+
+    // 15: ADF 14: ADIE 13: ADST, [12:9] TRGS..0 
+    //    [8:6] CKS 010 :: 340tclk 
+    //    [5:3] MDS 000 :: single mode 
+    //    [2:0] CH  000 :: AN0 
+    ADCADCSR = 0x0080; 
+
+    pinmap_pinout(pin, PinMap_ADC);
+}
+
+static inline uint32_t adc_read(analogin_t *obj) {
+    volatile uint16_t data;
+
+    // Select the appropriate channel and start conversion
+    ADCADCSR &= 0xfff8;
+    ADCADCSR |= (1 << 13 | (obj->adc & 0x7));
+
+    // Wait end of conversion
+    do {
+        data = ADCADCSR;
+    } while (((data & (1 << 15)) == 0) || ((data & (1 << 13)) != 0));
+
+    // clear flag
+    ADCADCSR &= ~(1 << 15);
+
+    return ((*(ADCDR[obj->adc])) >> 4) & 0x0FFF;   // 12 bits range
+}
+
+#if ANALOGIN_MEDIAN_FILTER
+static inline void order(uint32_t *a, uint32_t *b) {
+    if (*a > *b) {
+        uint32_t t = *a;
+        *a = *b;
+        *b = t;
+    }
+}
+#endif
+
+static inline uint32_t adc_read_u32(analogin_t *obj) {
+    uint32_t value;
+#if ANALOGIN_MEDIAN_FILTER
+    uint32_t v1 = adc_read(obj);
+    uint32_t v2 = adc_read(obj);
+    uint32_t v3 = adc_read(obj);
+    order(&v1, &v2);
+    order(&v2, &v3);
+    order(&v1, &v2);
+    value = v2;
+#else
+    value = adc_read(obj);
+#endif
+    return value;
+}
+
+uint16_t analogin_read_u16(analogin_t *obj) {
+    uint32_t value = adc_read_u32(obj);
+
+    return (value << 4) | ((value >> 8) & 0x000F); // 12-bit to 16-bit conversion
+}
+
+float analogin_read(analogin_t *obj) {
+    uint32_t value = adc_read_u32(obj);
+
+    return (float)value * (1.0f / (float)0x0FFF);  // 12 bits range
+}