mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
Diff: targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/analogin_api.c
- Revision:
- 219:993c9b0acbcc
- Child:
- 239:8cadf13dff33
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/analogin_api.c Mon Jun 02 09:45:07 2014 +0100 @@ -0,0 +1,190 @@ +/* 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" + +#if DEVICE_ANALOGIN + +#include "wait_api.h" +#include "cmsis.h" +#include "pinmap.h" +#include "error.h" + +static const PinMap PinMap_ADC[] = { + {PA_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN0 + {PA_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN1 + {PA_2, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN2 + {PA_3, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN3 + {PA_4, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN4 + {PA_5, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN5 + {PA_6, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN6 + {PA_7, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN7 + {PB_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN8 + {PB_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN9 + {PC_0, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN10 + {PC_1, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN11 + {PC_2, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN12 + {PC_3, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN13 + {PC_4, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN14 + {PC_5, ADC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // ADC1_IN15 + {NC, NC, 0} +}; + +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); + + if (obj->adc == (ADCName)NC) { + error("ADC error: pinout 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; + + // 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 = DISABLE; + 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; + HAL_ADC_Init(&AdcHandle); + + // Run the ADC calibration + HAL_ADCEx_Calibration_Start(&AdcHandle); + } +} + +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; + sConfig.SamplingTime = ADC_SAMPLETIME_7CYCLES_5; + + switch (obj->pin) { + case PA_0: + sConfig.Channel = ADC_CHANNEL_0; + break; + case PA_1: + sConfig.Channel = ADC_CHANNEL_1; + break; + case PA_2: + sConfig.Channel = ADC_CHANNEL_2; + break; + case PA_3: + sConfig.Channel = ADC_CHANNEL_3; + break; + case PA_4: + sConfig.Channel = ADC_CHANNEL_4; + break; + case PA_5: + sConfig.Channel = ADC_CHANNEL_5; + break; + case PA_6: + sConfig.Channel = ADC_CHANNEL_6; + break; + case PA_7: + sConfig.Channel = ADC_CHANNEL_7; + break; + case PB_0: + sConfig.Channel = ADC_CHANNEL_8; + break; + case PB_1: + sConfig.Channel = ADC_CHANNEL_9; + break; + case PC_0: + sConfig.Channel = ADC_CHANNEL_10; + break; + case PC_1: + sConfig.Channel = ADC_CHANNEL_11; + break; + case PC_2: + sConfig.Channel = ADC_CHANNEL_12; + break; + case PC_3: + sConfig.Channel = ADC_CHANNEL_13; + break; + case PC_4: + sConfig.Channel = ADC_CHANNEL_14; + break; + case PC_5: + sConfig.Channel = ADC_CHANNEL_15; + break; + 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) { + 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