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targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/analogin_api.c@52:a51c77007319, 2013-12-02 (annotated)
- Committer:
- mbed_official
- Date:
- Mon Dec 02 11:30:05 2013 +0000
- Revision:
- 52:a51c77007319
- Child:
- 56:99eb381a3269
Synchronized with git revision 49df530ae72ce97ccc773d1f2c13b38e868e6abd
Full URL: https://github.com/mbedmicro/mbed/commit/49df530ae72ce97ccc773d1f2c13b38e868e6abd/
Add STMicroelectronics NUCLEO_F103RB target
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 52:a51c77007319 | 1 | /* mbed Microcontroller Library |
mbed_official | 52:a51c77007319 | 2 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 52:a51c77007319 | 3 | * |
mbed_official | 52:a51c77007319 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 52:a51c77007319 | 5 | * you may not use this file except in compliance with the License. |
mbed_official | 52:a51c77007319 | 6 | * You may obtain a copy of the License at |
mbed_official | 52:a51c77007319 | 7 | * |
mbed_official | 52:a51c77007319 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 52:a51c77007319 | 9 | * |
mbed_official | 52:a51c77007319 | 10 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 52:a51c77007319 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 52:a51c77007319 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 52:a51c77007319 | 13 | * See the License for the specific language governing permissions and |
mbed_official | 52:a51c77007319 | 14 | * limitations under the License. |
mbed_official | 52:a51c77007319 | 15 | */ |
mbed_official | 52:a51c77007319 | 16 | //============================================================================== |
mbed_official | 52:a51c77007319 | 17 | // STM32F103 |
mbed_official | 52:a51c77007319 | 18 | //============================================================================== |
mbed_official | 52:a51c77007319 | 19 | #include "analogin_api.h" |
mbed_official | 52:a51c77007319 | 20 | #include "wait_api.h" |
mbed_official | 52:a51c77007319 | 21 | |
mbed_official | 52:a51c77007319 | 22 | #if DEVICE_ANALOGIN |
mbed_official | 52:a51c77007319 | 23 | |
mbed_official | 52:a51c77007319 | 24 | #include "cmsis.h" |
mbed_official | 52:a51c77007319 | 25 | #include "pinmap.h" |
mbed_official | 52:a51c77007319 | 26 | #include "error.h" |
mbed_official | 52:a51c77007319 | 27 | |
mbed_official | 52:a51c77007319 | 28 | static const PinMap PinMap_ADC[] = { |
mbed_official | 52:a51c77007319 | 29 | {PA_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, |
mbed_official | 52:a51c77007319 | 30 | {PA_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, |
mbed_official | 52:a51c77007319 | 31 | {PA_4, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, |
mbed_official | 52:a51c77007319 | 32 | {PB_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, |
mbed_official | 52:a51c77007319 | 33 | {PC_1, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, |
mbed_official | 52:a51c77007319 | 34 | {PC_0, ADC_1, STM_PIN_DATA(GPIO_Mode_AIN, 0)}, |
mbed_official | 52:a51c77007319 | 35 | {NC, NC, 0} |
mbed_official | 52:a51c77007319 | 36 | }; |
mbed_official | 52:a51c77007319 | 37 | |
mbed_official | 52:a51c77007319 | 38 | int adc_inited = 0; |
mbed_official | 52:a51c77007319 | 39 | |
mbed_official | 52:a51c77007319 | 40 | void analogin_init(analogin_t *obj, PinName pin) { |
mbed_official | 52:a51c77007319 | 41 | |
mbed_official | 52:a51c77007319 | 42 | ADC_TypeDef *adc; |
mbed_official | 52:a51c77007319 | 43 | ADC_InitTypeDef ADC_InitStructure; |
mbed_official | 52:a51c77007319 | 44 | |
mbed_official | 52:a51c77007319 | 45 | // Get the peripheral name (ADC_1, ADC_2...) from the pin and assign it to the object |
mbed_official | 52:a51c77007319 | 46 | obj->adc = (ADCName)pinmap_peripheral(pin, PinMap_ADC); |
mbed_official | 52:a51c77007319 | 47 | |
mbed_official | 52:a51c77007319 | 48 | if (obj->adc == (ADCName)NC) { |
mbed_official | 52:a51c77007319 | 49 | error("ADC pin mapping failed"); |
mbed_official | 52:a51c77007319 | 50 | } |
mbed_official | 52:a51c77007319 | 51 | |
mbed_official | 52:a51c77007319 | 52 | // Configure GPIO |
mbed_official | 52:a51c77007319 | 53 | pinmap_pinout(pin, PinMap_ADC); |
mbed_official | 52:a51c77007319 | 54 | |
mbed_official | 52:a51c77007319 | 55 | // Save pin number for the read function |
mbed_official | 52:a51c77007319 | 56 | obj->pin = pin; |
mbed_official | 52:a51c77007319 | 57 | |
mbed_official | 52:a51c77007319 | 58 | // The ADC initialization is done once |
mbed_official | 52:a51c77007319 | 59 | if (adc_inited == 0) { |
mbed_official | 52:a51c77007319 | 60 | adc_inited = 1; |
mbed_official | 52:a51c77007319 | 61 | |
mbed_official | 52:a51c77007319 | 62 | // Get ADC registers structure address |
mbed_official | 52:a51c77007319 | 63 | adc = (ADC_TypeDef *)(obj->adc); |
mbed_official | 52:a51c77007319 | 64 | |
mbed_official | 52:a51c77007319 | 65 | // Enable ADC clock |
mbed_official | 52:a51c77007319 | 66 | RCC_ADCCLKConfig(RCC_PCLK2_Div4); |
mbed_official | 52:a51c77007319 | 67 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); |
mbed_official | 52:a51c77007319 | 68 | |
mbed_official | 52:a51c77007319 | 69 | // Configure ADC |
mbed_official | 52:a51c77007319 | 70 | ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; |
mbed_official | 52:a51c77007319 | 71 | ADC_InitStructure.ADC_ScanConvMode = DISABLE; |
mbed_official | 52:a51c77007319 | 72 | ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; |
mbed_official | 52:a51c77007319 | 73 | ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; |
mbed_official | 52:a51c77007319 | 74 | ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; |
mbed_official | 52:a51c77007319 | 75 | ADC_InitStructure.ADC_NbrOfChannel = 1; |
mbed_official | 52:a51c77007319 | 76 | ADC_Init(adc, &ADC_InitStructure); |
mbed_official | 52:a51c77007319 | 77 | |
mbed_official | 52:a51c77007319 | 78 | // Enable ADC |
mbed_official | 52:a51c77007319 | 79 | ADC_Cmd(adc, ENABLE); |
mbed_official | 52:a51c77007319 | 80 | |
mbed_official | 52:a51c77007319 | 81 | // Calibrate ADC |
mbed_official | 52:a51c77007319 | 82 | ADC_ResetCalibration(adc); |
mbed_official | 52:a51c77007319 | 83 | while(ADC_GetResetCalibrationStatus(adc)); |
mbed_official | 52:a51c77007319 | 84 | ADC_StartCalibration(adc); |
mbed_official | 52:a51c77007319 | 85 | while(ADC_GetCalibrationStatus(adc)); |
mbed_official | 52:a51c77007319 | 86 | } |
mbed_official | 52:a51c77007319 | 87 | } |
mbed_official | 52:a51c77007319 | 88 | |
mbed_official | 52:a51c77007319 | 89 | static inline uint16_t adc_read(analogin_t *obj) { |
mbed_official | 52:a51c77007319 | 90 | // Get ADC registers structure address |
mbed_official | 52:a51c77007319 | 91 | ADC_TypeDef *adc = (ADC_TypeDef *)(obj->adc); |
mbed_official | 52:a51c77007319 | 92 | |
mbed_official | 52:a51c77007319 | 93 | // Configure ADC channel |
mbed_official | 52:a51c77007319 | 94 | switch (obj->pin) { |
mbed_official | 52:a51c77007319 | 95 | case PA_0: |
mbed_official | 52:a51c77007319 | 96 | ADC_RegularChannelConfig(adc, ADC_Channel_0, 1, ADC_SampleTime_7Cycles5); |
mbed_official | 52:a51c77007319 | 97 | break; |
mbed_official | 52:a51c77007319 | 98 | case PA_1: |
mbed_official | 52:a51c77007319 | 99 | ADC_RegularChannelConfig(adc, ADC_Channel_1, 1, ADC_SampleTime_7Cycles5); |
mbed_official | 52:a51c77007319 | 100 | break; |
mbed_official | 52:a51c77007319 | 101 | case PA_4: |
mbed_official | 52:a51c77007319 | 102 | ADC_RegularChannelConfig(adc, ADC_Channel_4, 1, ADC_SampleTime_7Cycles5); |
mbed_official | 52:a51c77007319 | 103 | break; |
mbed_official | 52:a51c77007319 | 104 | case PB_0: |
mbed_official | 52:a51c77007319 | 105 | ADC_RegularChannelConfig(adc, ADC_Channel_8, 1, ADC_SampleTime_7Cycles5); |
mbed_official | 52:a51c77007319 | 106 | break; |
mbed_official | 52:a51c77007319 | 107 | case PC_1: |
mbed_official | 52:a51c77007319 | 108 | ADC_RegularChannelConfig(adc, ADC_Channel_11, 1, ADC_SampleTime_7Cycles5); |
mbed_official | 52:a51c77007319 | 109 | break; |
mbed_official | 52:a51c77007319 | 110 | case PC_0: |
mbed_official | 52:a51c77007319 | 111 | ADC_RegularChannelConfig(adc, ADC_Channel_10, 1, ADC_SampleTime_7Cycles5); |
mbed_official | 52:a51c77007319 | 112 | break; |
mbed_official | 52:a51c77007319 | 113 | default: |
mbed_official | 52:a51c77007319 | 114 | return 0; |
mbed_official | 52:a51c77007319 | 115 | } |
mbed_official | 52:a51c77007319 | 116 | |
mbed_official | 52:a51c77007319 | 117 | ADC_SoftwareStartConvCmd(adc, ENABLE); // Start conversion |
mbed_official | 52:a51c77007319 | 118 | |
mbed_official | 52:a51c77007319 | 119 | while(ADC_GetFlagStatus(adc, ADC_FLAG_EOC) == RESET); // Wait end of conversion |
mbed_official | 52:a51c77007319 | 120 | |
mbed_official | 52:a51c77007319 | 121 | return(ADC_GetConversionValue(adc)); // Get conversion value |
mbed_official | 52:a51c77007319 | 122 | } |
mbed_official | 52:a51c77007319 | 123 | |
mbed_official | 52:a51c77007319 | 124 | uint16_t analogin_read_u16(analogin_t *obj) { |
mbed_official | 52:a51c77007319 | 125 | return(adc_read(obj)); |
mbed_official | 52:a51c77007319 | 126 | } |
mbed_official | 52:a51c77007319 | 127 | |
mbed_official | 52:a51c77007319 | 128 | float analogin_read(analogin_t *obj) { |
mbed_official | 52:a51c77007319 | 129 | uint16_t value = adc_read(obj); |
mbed_official | 52:a51c77007319 | 130 | return (float)value * (1.0f / (float)0xFFF); // 12 bits range |
mbed_official | 52:a51c77007319 | 131 | } |
mbed_official | 52:a51c77007319 | 132 | |
mbed_official | 52:a51c77007319 | 133 | #endif |