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targets/TARGET_STM/TARGET_STM32L1/analogout_api.c@178:c26431f84b0d, 2017-11-09 (annotated)
- Committer:
- amithy
- Date:
- Thu Nov 09 22:14:37 2017 +0000
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
test export
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /* mbed Microcontroller Library |
<> | 144:ef7eb2e8f9f7 | 2 | * Copyright (c) 2014, STMicroelectronics |
<> | 144:ef7eb2e8f9f7 | 3 | * All rights reserved. |
<> | 144:ef7eb2e8f9f7 | 4 | * |
<> | 144:ef7eb2e8f9f7 | 5 | * Redistribution and use in source and binary forms, with or without |
<> | 144:ef7eb2e8f9f7 | 6 | * modification, are permitted provided that the following conditions are met: |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * 1. Redistributions of source code must retain the above copyright notice, |
<> | 144:ef7eb2e8f9f7 | 9 | * this list of conditions and the following disclaimer. |
<> | 144:ef7eb2e8f9f7 | 10 | * 2. Redistributions in binary form must reproduce the above copyright notice, |
<> | 144:ef7eb2e8f9f7 | 11 | * this list of conditions and the following disclaimer in the documentation |
<> | 144:ef7eb2e8f9f7 | 12 | * and/or other materials provided with the distribution. |
<> | 144:ef7eb2e8f9f7 | 13 | * 3. Neither the name of STMicroelectronics nor the names of its contributors |
<> | 144:ef7eb2e8f9f7 | 14 | * may be used to endorse or promote products derived from this software |
<> | 144:ef7eb2e8f9f7 | 15 | * without specific prior written permission. |
<> | 144:ef7eb2e8f9f7 | 16 | * |
<> | 144:ef7eb2e8f9f7 | 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
<> | 144:ef7eb2e8f9f7 | 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
<> | 144:ef7eb2e8f9f7 | 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
<> | 144:ef7eb2e8f9f7 | 20 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
<> | 144:ef7eb2e8f9f7 | 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
<> | 144:ef7eb2e8f9f7 | 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
<> | 144:ef7eb2e8f9f7 | 23 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
<> | 144:ef7eb2e8f9f7 | 24 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
<> | 144:ef7eb2e8f9f7 | 25 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
<> | 144:ef7eb2e8f9f7 | 26 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
<> | 144:ef7eb2e8f9f7 | 27 | */ |
<> | 144:ef7eb2e8f9f7 | 28 | #include "mbed_assert.h" |
<> | 144:ef7eb2e8f9f7 | 29 | #include "analogout_api.h" |
<> | 144:ef7eb2e8f9f7 | 30 | |
<> | 144:ef7eb2e8f9f7 | 31 | #if DEVICE_ANALOGOUT |
<> | 144:ef7eb2e8f9f7 | 32 | |
<> | 144:ef7eb2e8f9f7 | 33 | #include "cmsis.h" |
<> | 144:ef7eb2e8f9f7 | 34 | #include "pinmap.h" |
<> | 144:ef7eb2e8f9f7 | 35 | #include "mbed_error.h" |
<> | 144:ef7eb2e8f9f7 | 36 | #include "PeripheralPins.h" |
<> | 144:ef7eb2e8f9f7 | 37 | |
<> | 144:ef7eb2e8f9f7 | 38 | #define DAC_RANGE (0xFFF) // 12 bits |
<> | 144:ef7eb2e8f9f7 | 39 | #define DAC_NB_BITS (12) |
<> | 144:ef7eb2e8f9f7 | 40 | |
<> | 144:ef7eb2e8f9f7 | 41 | static DAC_HandleTypeDef DacHandle; |
<> | 144:ef7eb2e8f9f7 | 42 | |
<> | 144:ef7eb2e8f9f7 | 43 | // These variables are used for the "free" function |
<> | 144:ef7eb2e8f9f7 | 44 | static int pa4_used = 0; |
<> | 144:ef7eb2e8f9f7 | 45 | static int pa5_used = 0; |
<> | 144:ef7eb2e8f9f7 | 46 | |
<> | 144:ef7eb2e8f9f7 | 47 | void analogout_init(dac_t *obj, PinName pin) { |
<> | 144:ef7eb2e8f9f7 | 48 | DAC_ChannelConfTypeDef sConfig; |
<> | 144:ef7eb2e8f9f7 | 49 | |
<> | 144:ef7eb2e8f9f7 | 50 | DacHandle.Instance = DAC; |
<> | 144:ef7eb2e8f9f7 | 51 | |
<> | 144:ef7eb2e8f9f7 | 52 | // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object |
<> | 144:ef7eb2e8f9f7 | 53 | obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC); |
<> | 144:ef7eb2e8f9f7 | 54 | MBED_ASSERT(obj->dac != (DACName)NC); |
<> | 144:ef7eb2e8f9f7 | 55 | |
<> | 144:ef7eb2e8f9f7 | 56 | // Configure GPIO |
<> | 144:ef7eb2e8f9f7 | 57 | pinmap_pinout(pin, PinMap_DAC); |
<> | 144:ef7eb2e8f9f7 | 58 | |
<> | 144:ef7eb2e8f9f7 | 59 | // Save the channel for future use |
<> | 144:ef7eb2e8f9f7 | 60 | obj->pin = pin; |
<> | 144:ef7eb2e8f9f7 | 61 | |
<> | 144:ef7eb2e8f9f7 | 62 | // Enable DAC clock |
<> | 144:ef7eb2e8f9f7 | 63 | __DAC_CLK_ENABLE(); |
<> | 144:ef7eb2e8f9f7 | 64 | |
<> | 144:ef7eb2e8f9f7 | 65 | // Configure DAC |
<> | 144:ef7eb2e8f9f7 | 66 | sConfig.DAC_Trigger = DAC_TRIGGER_NONE; |
<> | 144:ef7eb2e8f9f7 | 67 | sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE; |
<> | 144:ef7eb2e8f9f7 | 68 | |
<> | 144:ef7eb2e8f9f7 | 69 | if (pin == PA_4) { |
<> | 144:ef7eb2e8f9f7 | 70 | HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1); |
<> | 144:ef7eb2e8f9f7 | 71 | pa4_used = 1; |
<> | 144:ef7eb2e8f9f7 | 72 | } else { // PA_5 |
<> | 144:ef7eb2e8f9f7 | 73 | HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2); |
<> | 144:ef7eb2e8f9f7 | 74 | pa5_used = 1; |
<> | 144:ef7eb2e8f9f7 | 75 | } |
<> | 144:ef7eb2e8f9f7 | 76 | |
<> | 144:ef7eb2e8f9f7 | 77 | analogout_write_u16(obj, 0); |
<> | 144:ef7eb2e8f9f7 | 78 | } |
<> | 144:ef7eb2e8f9f7 | 79 | |
<> | 144:ef7eb2e8f9f7 | 80 | void analogout_free(dac_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 81 | // Reset DAC and disable clock |
<> | 144:ef7eb2e8f9f7 | 82 | if (obj->pin == PA_4) pa4_used = 0; |
<> | 144:ef7eb2e8f9f7 | 83 | if (obj->pin == PA_5) pa5_used = 0; |
<> | 144:ef7eb2e8f9f7 | 84 | if ((pa4_used == 0) && (pa5_used == 0)) { |
<> | 144:ef7eb2e8f9f7 | 85 | __DAC_FORCE_RESET(); |
<> | 144:ef7eb2e8f9f7 | 86 | __DAC_RELEASE_RESET(); |
<> | 144:ef7eb2e8f9f7 | 87 | __DAC_CLK_DISABLE(); |
<> | 144:ef7eb2e8f9f7 | 88 | } |
<> | 144:ef7eb2e8f9f7 | 89 | |
<> | 144:ef7eb2e8f9f7 | 90 | // Configure GPIO |
<> | 144:ef7eb2e8f9f7 | 91 | pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0)); |
<> | 144:ef7eb2e8f9f7 | 92 | } |
<> | 144:ef7eb2e8f9f7 | 93 | |
<> | 144:ef7eb2e8f9f7 | 94 | static inline void dac_write(dac_t *obj, int value) { |
<> | 144:ef7eb2e8f9f7 | 95 | if (obj->pin == PA_4) { |
<> | 144:ef7eb2e8f9f7 | 96 | HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE)); |
<> | 144:ef7eb2e8f9f7 | 97 | HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1); |
<> | 144:ef7eb2e8f9f7 | 98 | } else { // PA_5 |
<> | 144:ef7eb2e8f9f7 | 99 | HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE)); |
<> | 144:ef7eb2e8f9f7 | 100 | HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2); |
<> | 144:ef7eb2e8f9f7 | 101 | } |
<> | 144:ef7eb2e8f9f7 | 102 | } |
<> | 144:ef7eb2e8f9f7 | 103 | |
<> | 144:ef7eb2e8f9f7 | 104 | static inline int dac_read(dac_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 105 | if (obj->pin == PA_4) { |
<> | 144:ef7eb2e8f9f7 | 106 | return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1); |
<> | 144:ef7eb2e8f9f7 | 107 | } else { // PA_5 |
<> | 144:ef7eb2e8f9f7 | 108 | return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2); |
<> | 144:ef7eb2e8f9f7 | 109 | } |
<> | 144:ef7eb2e8f9f7 | 110 | } |
<> | 144:ef7eb2e8f9f7 | 111 | |
<> | 144:ef7eb2e8f9f7 | 112 | void analogout_write(dac_t *obj, float value) { |
<> | 144:ef7eb2e8f9f7 | 113 | if (value < 0.0f) { |
<> | 144:ef7eb2e8f9f7 | 114 | dac_write(obj, 0); // Min value |
<> | 144:ef7eb2e8f9f7 | 115 | } else if (value > 1.0f) { |
<> | 144:ef7eb2e8f9f7 | 116 | dac_write(obj, (int)DAC_RANGE); // Max value |
<> | 144:ef7eb2e8f9f7 | 117 | } else { |
<> | 144:ef7eb2e8f9f7 | 118 | dac_write(obj, (int)(value * (float)DAC_RANGE)); |
<> | 144:ef7eb2e8f9f7 | 119 | } |
<> | 144:ef7eb2e8f9f7 | 120 | } |
<> | 144:ef7eb2e8f9f7 | 121 | |
<> | 144:ef7eb2e8f9f7 | 122 | void analogout_write_u16(dac_t *obj, uint16_t value) { |
<> | 144:ef7eb2e8f9f7 | 123 | dac_write(obj, value >> (16 - DAC_NB_BITS)); |
<> | 144:ef7eb2e8f9f7 | 124 | } |
<> | 144:ef7eb2e8f9f7 | 125 | |
<> | 144:ef7eb2e8f9f7 | 126 | float analogout_read(dac_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 127 | uint32_t value = dac_read(obj); |
<> | 144:ef7eb2e8f9f7 | 128 | return (float)value * (1.0f / (float)DAC_RANGE); |
<> | 144:ef7eb2e8f9f7 | 129 | } |
<> | 144:ef7eb2e8f9f7 | 130 | |
<> | 144:ef7eb2e8f9f7 | 131 | uint16_t analogout_read_u16(dac_t *obj) { |
<> | 144:ef7eb2e8f9f7 | 132 | uint32_t value = dac_read(obj); |
<> | 144:ef7eb2e8f9f7 | 133 | return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits |
<> | 144:ef7eb2e8f9f7 | 134 | } |
<> | 144:ef7eb2e8f9f7 | 135 | |
<> | 144:ef7eb2e8f9f7 | 136 | #endif // DEVICE_ANALOGOUT |