Diff: targets/TARGET_TOSHIBA/TARGET_TMPM066/analogin_api.c

Revision:

172:7d866c31b3c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_TOSHIBA/TARGET_TMPM066/analogin_api.c	Thu Aug 31 17:27:04 2017 +0100
@@ -0,0 +1,93 @@
+/* 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_10BIT_RANGE        0x3FF
+
+static const PinMap PinMap_ADC[] = {
+    {PA0, ADC_A0, PIN_DATA(0, 0)},
+    {PA1, ADC_A1, PIN_DATA(0, 0)},
+    {PA2, ADC_A2, PIN_DATA(0, 0)},
+    {PA3, ADC_A3, PIN_DATA(0, 0)},
+    {PA4, ADC_A4, PIN_DATA(0, 0)},
+    {PA5, ADC_A5, PIN_DATA(0, 0)},
+    {PA6, ADC_A6, PIN_DATA(0, 0)},
+    {PA7, ADC_A7, PIN_DATA(0, 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 to ADC
+    CG_SetFcPeriphA(CG_FC_PERIPH_ADC, ENABLE);
+    CG_SetADCClkSupply(ENABLE);
+    // Set pin function as ADC
+    pinmap_pinout(pin, PinMap_ADC);
+    if (!adc_reset_init) {
+        // Software reset ADC
+        ADC_SWReset();
+        adc_reset_init = 1;
+    }
+    // Set sample hold time and pre-scale clock
+    ADC_SetClk(ADC_CONVERSION_81_CLOCK, ADC_FC_DIVIDE_LEVEL_8);
+    // Set input channel
+    ADC_SetInputChannel(obj->adc);
+    // Turn VREF on
+    ADC_SetVref(ENABLE);
+    // Use fixed-channel single conversion mode
+    ADC_SetRepeatMode(DISABLE);
+    ADC_SetScanMode(DISABLE);
+}
+
+uint16_t analogin_read_u16(analogin_t *obj)
+{
+    ADC_ResultTypeDef ret;
+
+    // Assert that ADC channel is valid
+    MBED_ASSERT(obj->adc != (ADCName) NC);
+
+    // Set input channel
+    ADC_SetInputChannel(obj->adc);
+    // Enable Vref
+    ADC_SetVref(ENABLE);
+    // Wait at least 3us to ensure the voltage is stable
+    wait_us(10U);
+    // Start ADC conversion
+    ADC_Start();
+    // Wait until AD conversion complete
+    while (ADC_GetConvertState().Bit.NormalComplete != 1) {
+        // Do nothing
+    }
+    // Convert result
+    ret = ADC_GetConvertResult(obj->adc);
+    // Disable Vref to go into standby mode
+    ADC_SetVref(DISABLE);
+    return (uint16_t)ret.ADCResultValue;
+}
+
+float analogin_read(analogin_t *obj)
+{
+    uint16_t value = analogin_read_u16(obj);
+    return (float)(value * (1.0f / (float)ADC_10BIT_RANGE));
+}