Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/analogin_api.c

Revision:

0:6bc4ac881c8e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/analogin_api.c	Thu Jul 28 15:56:34 2016 +0000
@@ -0,0 +1,199 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2014, STMicroelectronics
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "mbed_assert.h"
+#include "analogin_api.h"
+
+#if DEVICE_ANALOGIN
+
+#include "cmsis.h"
+#include "pinmap.h"
+#include "wait_api.h"
+
+static const PinMap PinMap_ADC[] = {
+    {PA_0,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN0
+    {PA_1,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN1
+    {PA_2,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN2
+    {PA_3,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN3
+    {PA_4,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4
+    {PA_5,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN5
+    {PA_6,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN6
+    {PA_7,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN7
+    {PB_0,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8
+    {PB_1,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN9
+    {PB_12, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN18
+    {PB_13, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN19
+    {PB_14, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN20
+    {PB_15, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN21
+    {PC_0,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10
+    {PC_1,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11
+    {PC_2,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN12
+    {PC_3,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN13
+    {PC_4,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN14
+    {PC_5,  ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN15
+    {NC,    NC,    0}
+};
+
+int adc_inited = 0;
+
+void analogin_init(analogin_t *obj, PinName pin) {
+    ADC_TypeDef *adc;
+    ADC_InitTypeDef ADC_InitStructure;
+
+    // Get the peripheral name from the pin and assign it to the object
+    obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC);
+    MBED_ASSERT(obj->adc != (ADCName)NC);
+
+    // Configure GPIO
+    pinmap_pinout(pin, PinMap_ADC);
+
+    // Save pin number for the read function
+    obj->pin = pin;
+
+    // The ADC initialization is done once
+    if (adc_inited == 0) {
+        adc_inited = 1;
+
+        // Get ADC registers structure address
+        adc = (ADC_TypeDef *)(obj->adc);
+
+        // Enable the HSI
+        RCC_HSICmd(ENABLE);
+        // Wait until HSI oscillator is ready
+        while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET) {}
+      
+        // Enable ADC clock
+        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
+
+        // Configure ADC
+        ADC_InitStructure.ADC_Resolution           = ADC_Resolution_12b;
+        ADC_InitStructure.ADC_ScanConvMode         = DISABLE;
+        ADC_InitStructure.ADC_ContinuousConvMode   = DISABLE;
+        ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
+        ADC_InitStructure.ADC_ExternalTrigConv     = ADC_ExternalTrigConv_T2_CC2;
+        ADC_InitStructure.ADC_DataAlign            = ADC_DataAlign_Right;
+        ADC_InitStructure.ADC_NbrOfConversion      = 1;
+        ADC_Init(adc, &ADC_InitStructure);
+
+        // Enable ADC
+        ADC_Cmd(adc, ENABLE);
+    }
+}
+
+static inline uint16_t adc_read(analogin_t *obj) {
+    // Get ADC registers structure address
+    ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc);
+    uint8_t channel = 0;
+
+    // Configure ADC channel
+    switch (obj->pin) {
+        case PA_0:
+            channel = ADC_Channel_0;
+            break;
+        case PA_1:
+            channel = ADC_Channel_1;
+            break;
+        case PA_2:
+            channel = ADC_Channel_2;
+            break;
+        case PA_3:
+            channel = ADC_Channel_3;
+            break;
+        case PA_4:
+            channel = ADC_Channel_4;
+            break;
+        case PA_5:
+            channel = ADC_Channel_5;
+            break;
+        case PA_6:
+            channel = ADC_Channel_6;
+            break;
+        case PA_7:
+            channel = ADC_Channel_7;
+            break;
+        case PB_0:
+            channel = ADC_Channel_8;
+            break;
+        case PB_1:
+            channel = ADC_Channel_9;
+            break;
+        case PB_12:
+            channel = ADC_Channel_18;
+            break;
+        case PB_13:
+            channel = ADC_Channel_19;
+            break;
+        case PB_14:
+            channel = ADC_Channel_20;
+            break;
+        case PB_15:
+            channel = ADC_Channel_21;
+            break;
+        case PC_0:
+            channel = ADC_Channel_10;
+            break;
+        case PC_1:
+            channel = ADC_Channel_11;
+            break;
+        case PC_2:
+            channel = ADC_Channel_12;
+            break;
+        case PC_3:
+            channel = ADC_Channel_13;
+            break;
+        case PC_4:
+            channel = ADC_Channel_14;
+            break;
+        case PC_5:
+            channel = ADC_Channel_15;
+            break;
+        default:
+            return 0;
+    }
+
+    ADC_RegularChannelConfig(adc, channel, 1, ADC_SampleTime_4Cycles);
+
+    ADC_SoftwareStartConv(adc); // Start conversion
+
+    while (ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion
+
+    return (ADC_GetConversionValue(adc)); // Get conversion value
+}
+
+uint16_t analogin_read_u16(analogin_t *obj) {
+    uint16_t value = adc_read(obj);
+    // 12-bit to 16-bit conversion
+    value = ((value << 4) & (uint16_t)0xFFF0) | ((value >> 8) & (uint16_t)0x000F);
+    return value;
+}
+
+float analogin_read(analogin_t *obj) {
+    uint16_t value = adc_read(obj);
+    return (float)value * (1.0f / (float)0xFFF); // 12 bits range
+}
+
+#endif