mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/analogin_api.c
- Committer:
- mbed_official
- Date:
- 2014-08-27
- Revision:
- 298:7557d401dbc3
- Parent:
- 227:7bd0639b8911
- Child:
- 309:8f72041da6ba
File content as of revision 298:7557d401dbc3:
/* 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 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