Diff: targets/TARGET_TOSHIBA/TARGET_TMPM46B/analogin_api.c

Revision:

185:08ed48f1de7f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_TOSHIBA/TARGET_TMPM46B/analogin_api.c	Thu Apr 19 17:12:19 2018 +0100
@@ -0,0 +1,94 @@
+/* mbed Microcontroller Library
+ * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2017 All rights reserved
+ *
+ * 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 "analogin_api.h"
+#include "PeripheralNames.h"
+#include "pinmap.h"
+#include "mbed_wait_api.h"
+
+static uint8_t adc_reset_init = 0;  // Is ADC Reset happened yet?
+#define ADC_12BIT_RANGE   0xFFF
+
+static const PinMap PinMap_ADC[] = {
+    {PJ0, ADC_A0,  PIN_DATA(2, 0)},
+    {PJ1, ADC_A1,  PIN_DATA(2, 0)},
+    {PJ2, ADC_A2,  PIN_DATA(2, 0)},
+    {PJ3, ADC_A3,  PIN_DATA(2, 0)},
+    {PJ4, ADC_A4,  PIN_DATA(2, 0)},
+    {PJ5, ADC_A5,  PIN_DATA(2, 0)},
+    {PJ6, ADC_A6,  PIN_DATA(2, 0)},
+    {PJ7, ADC_A7,  PIN_DATA(2, 0)},
+    {NC,  NC,     0}
+};
+
+void analogin_init(analogin_t *obj, PinName pin)
+{
+    // Check that pin belong to ADC module
+    obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+    MBED_ASSERT(obj->adc != (ADCName)NC);
+
+    // Enable clock supply
+    CG_SetADCClkSupply(ENABLE);
+    // Set pin function as ADC
+    pinmap_pinout(pin, PinMap_ADC);
+    if (!adc_reset_init) {
+        // Software reset ADC
+        ADC_SWReset(TSB_AD);
+        adc_reset_init = 1;
+    }
+    // Set sample hold time and pre-scale clock
+    ADC_SetClk(TSB_AD, ADC_CONVERSION_CLK_80, ADC_FC_DIVIDE_LEVEL_8);
+    // Set input channel
+    ADC_SetInputChannel(TSB_AD, (ADC_AINx)obj->adc);
+    // Turn VREF on
+    ADC_SetVref(TSB_AD, ENABLE);
+    // Use fixed-channel single conversion mode
+    ADC_SetRepeatMode(TSB_AD, DISABLE);
+    ADC_SetScanMode(TSB_AD, DISABLE);
+}
+
+uint16_t analogin_read_u16(analogin_t *obj)
+{
+    ADC_Result ret = {0x00};
+
+    // Assert that ADC channel is valid
+    MBED_ASSERT(obj->adc != (ADCName)NC);
+    wait_us(300); // Wait for register to update with convert value
+
+    // Set input channel
+    ADC_SetInputChannel(TSB_AD, (ADC_AINx)obj->adc);
+    // Enable Vref
+    ADC_SetVref(TSB_AD, ENABLE);
+    // Wait at least 3us to ensure the voltage is stable
+    wait_us(10U);
+    // Start ADC conversion
+    ADC_Start(TSB_AD);
+    // Wait until AD conversion complete
+    while(ADC_GetConvertState(TSB_AD).Bit.NormalComplete != 1) {
+        // Do nothing
+    }
+    wait_us(30);
+    // Convert result
+    ret = ADC_GetConvertResult(TSB_AD, (ADC_REGx)obj->adc);
+    // Disable Vref to go into standby mode
+    ADC_SetVref(TSB_AD, DISABLE);
+    return (uint16_t)ret.Bit.ADResult;
+}
+
+float analogin_read(analogin_t *obj)
+{
+    uint16_t value = analogin_read_u16(obj);
+    return (float)(value * (1.0f / (float)ADC_12BIT_RANGE));
+}