Mouse code for the MacroRat
mbed-dev/targets/TARGET_STM/TARGET_STM32F0/analogin_api.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/* 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 "mbed_wait_api.h" #include "cmsis.h" #include "pinmap.h" #include "PeripheralPins.h" #include "mbed_error.h" ADC_HandleTypeDef AdcHandle; int adc_inited = 0; void analogin_init(analogin_t *obj, PinName pin) { // 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, Vbat, ...) // ADC Internal Channels "pins" are described in PinNames.h and must have a value >= 0xF0 if (pin < 0xF0) { 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 __ADC1_CLK_ENABLE(); // Configure ADC AdcHandle.Instance = (ADC_TypeDef *)(obj->adc); AdcHandle.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4; AdcHandle.Init.Resolution = ADC_RESOLUTION12b; AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT; AdcHandle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD; AdcHandle.Init.EOCSelection = EOC_SINGLE_CONV; AdcHandle.Init.LowPowerAutoWait = DISABLE; AdcHandle.Init.LowPowerAutoPowerOff = DISABLE; AdcHandle.Init.ContinuousConvMode = DISABLE; AdcHandle.Init.DiscontinuousConvMode = DISABLE; AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START; AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE; AdcHandle.Init.DMAContinuousRequests = DISABLE; AdcHandle.Init.Overrun = OVR_DATA_OVERWRITTEN; if (HAL_ADC_Init(&AdcHandle) != HAL_OK) { error("Cannot initialize ADC"); } // Run the ADC calibration if (HAL_ADCEx_Calibration_Start(&AdcHandle) != HAL_OK) { error("Cannot Start ADC_Calibration"); } } } static inline uint16_t adc_read(analogin_t *obj) { ADC_ChannelConfTypeDef sConfig; AdcHandle.Instance = (ADC_TypeDef *)(obj->adc); // Configure ADC channel sConfig.Rank = ADC_RANK_CHANNEL_NUMBER; #if defined (TARGET_STM32F091RC) sConfig.SamplingTime = ADC_SAMPLETIME_13CYCLES_5; #else sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5; #endif 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; #ifdef ADC_CHANNEL_VBAT case 18: sConfig.Channel = ADC_CHANNEL_VBAT; break; #endif default: return 0; } // Clear all channels as it is not done in HAL_ADC_ConfigChannel() AdcHandle.Instance->CHSELR = 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