mbed library sources
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/analogin_api.c
- Revision:
- 76:aeb1df146756
- Child:
- 77:b5886236e6f0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/analogin_api.c Mon Jan 27 14:30:07 2014 +0000 @@ -0,0 +1,142 @@ +/* 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 "analogin_api.h" +#include "wait_api.h" + +#if DEVICE_ANALOGIN + +#include "cmsis.h" +#include "pinmap.h" +#include "error.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_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN4 + {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN8 + {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN11 + {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0xFF)}, // ADC_IN10 + {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 (ADC_1, ADC_2...) from the pin and assign it to the object + obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); + + if (obj->adc == (ADCName)NC) { + error("ADC pin mapping failed"); + } + + // 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_ContinuousConvMode = DISABLE; + ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; + ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_TRGO; + ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; + ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; + ADC_Init(adc, &ADC_InitStructure); + + // Calibrate ADC + ADC_GetCalibrationFactor(adc); + + // 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); + + adc->CHSELR = 0; // Clear all channels first + + // Configure ADC channel + switch (obj->pin) { + case PA_0: + ADC_ChannelConfig(adc, ADC_Channel_0, ADC_SampleTime_7_5Cycles); + break; + case PA_1: + ADC_ChannelConfig(adc, ADC_Channel_1, ADC_SampleTime_7_5Cycles); + break; + case PA_4: + ADC_ChannelConfig(adc, ADC_Channel_4, ADC_SampleTime_7_5Cycles); + break; + case PB_0: + ADC_ChannelConfig(adc, ADC_Channel_8, ADC_SampleTime_7_5Cycles); + break; + case PC_1: + ADC_ChannelConfig(adc, ADC_Channel_11, ADC_SampleTime_7_5Cycles); + break; + case PC_0: + ADC_ChannelConfig(adc, ADC_Channel_10, ADC_SampleTime_7_5Cycles); + break; + default: + return 0; + } + + while(!ADC_GetFlagStatus(adc, ADC_FLAG_ADRDY)); // Wait ADC ready + + ADC_StartOfConversion(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) { + return(adc_read(obj)); +} + +float analogin_read(analogin_t *obj) { + uint16_t value = adc_read(obj); + return (float)value * (1.0f / (float)0xFFF); // 12 bits range +} + +#endif