Iftikhar Aziz
4545
Fork of
mbed-dev
by 
Umar Naeem
Diff: targets/TARGET_STM/TARGET_STM32F1/analogin_api.c
- Revision:
- 149:156823d33999
- Child:
- 150:02e0a0aed4ec
diff -r 21d94c44109e -r 156823d33999 targets/TARGET_STM/TARGET_STM32F1/analogin_api.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F1/analogin_api.c Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,188 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2016, 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 "wait_api.h"
+#include "cmsis.h"
+#include "pinmap.h"
+#include "PeripheralPins.h"
+
+ADC_HandleTypeDef AdcHandle;
+
+int adc_inited = 0;
+
+void analogin_init(analogin_t *obj, PinName pin)
+{
+ RCC_PeriphCLKInitTypeDef PeriphClkInit;
+
+ // 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);
+
+ // Get the functions (adc channel) from the pin and assign it to the object
+ uint32_t function = pinmap_function(pin, PinMap_ADC);
+ MBED_ASSERT(function != (uint32_t)NC);
+ obj->channel = STM_PIN_CHANNEL(function);
+
+ // Configure GPIO excepted for internal channels (Temperature, Vref)
+ if ((obj->channel != 16) && (obj->channel != 17)) {
+ 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;
+
+ // Enable ADC clock
+ __HAL_RCC_ADC1_CLK_ENABLE();
+
+ // Configure ADC clock prescaler
+ // Caution: On STM32F1, ADC clock frequency max is 14 MHz (refer to device datasheet).
+ // Therefore, ADC clock prescaler must be configured in function
+ // of ADC clock source frequency to remain below this maximum frequency.
+ // with 8 MHz external xtal: PCLK2 = 72 MHz --> ADC clock = 72/6 = 12 MHz
+ // with internal clock : PCLK2 = 64 MHz --> ADC clock = 64/6 = 10.67 MHz
+ PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_ADC;
+ PeriphClkInit.AdcClockSelection = RCC_ADCPCLK2_DIV6;
+ HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit);
+
+ // Configure ADC
+ AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+ AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
+ AdcHandle.Init.ScanConvMode = DISABLE;
+ AdcHandle.Init.ContinuousConvMode = DISABLE;
+ AdcHandle.Init.NbrOfConversion = 1;
+ AdcHandle.Init.DiscontinuousConvMode = DISABLE;
+ AdcHandle.Init.NbrOfDiscConversion = 0;
+ AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
+ HAL_ADC_Init(&AdcHandle);
+ }
+}
+
+static inline uint16_t adc_read(analogin_t *obj)
+{
+ ADC_ChannelConfTypeDef sConfig;
+
+ AdcHandle.Instance = (ADC_TypeDef *)(obj->adc);
+
+ // Configure ADC channel
+ sConfig.Rank = 1;
+ sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5;
+
+ switch (obj->channel) {
+ case 0:
+ sConfig.Channel = ADC_CHANNEL_0;
+ break;
+ case 1:
+ sConfig.Channel = ADC_CHANNEL_1;
+ break;
+ case 2:
+ sConfig.Channel = ADC_CHANNEL_2;
+ break;
+ case 3:
+ sConfig.Channel = ADC_CHANNEL_3;
+ break;
+ case 4:
+ sConfig.Channel = ADC_CHANNEL_4;
+ break;
+ case 5:
+ sConfig.Channel = ADC_CHANNEL_5;
+ break;
+ case 6:
+ sConfig.Channel = ADC_CHANNEL_6;
+ break;
+ case 7:
+ sConfig.Channel = ADC_CHANNEL_7;
+ break;
+ case 8:
+ sConfig.Channel = ADC_CHANNEL_8;
+ break;
+ case 9:
+ sConfig.Channel = ADC_CHANNEL_9;
+ break;
+ case 10:
+ sConfig.Channel = ADC_CHANNEL_10;
+ break;
+ case 11:
+ sConfig.Channel = ADC_CHANNEL_11;
+ break;
+ case 12:
+ sConfig.Channel = ADC_CHANNEL_12;
+ break;
+ case 13:
+ sConfig.Channel = ADC_CHANNEL_13;
+ break;
+ case 14:
+ sConfig.Channel = ADC_CHANNEL_14;
+ break;
+ case 15:
+ sConfig.Channel = ADC_CHANNEL_15;
+ break;
+ case 16:
+ sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
+ break;
+ case 17:
+ sConfig.Channel = ADC_CHANNEL_VREFINT;
+ break;
+ default:
+ return 0;
+ }
+
+ HAL_ADC_ConfigChannel(&AdcHandle, &sConfig);
+
+ HAL_ADC_Start(&AdcHandle); // Start conversion
+
+ // Wait end of conversion and get value
+ if (HAL_ADC_PollForConversion(&AdcHandle, 10) == HAL_OK) {
+ return (HAL_ADC_GetValue(&AdcHandle));
+ } else {
+ return 0;
+ }
+}
+
+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