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Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_STM/TARGET_STM32L1/analogout_api.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

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group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2014, STMicroelectronics
group-onsemi 0:098463de4c5d 3 * All rights reserved.
group-onsemi 0:098463de4c5d 4 *
group-onsemi 0:098463de4c5d 5 * Redistribution and use in source and binary forms, with or without
group-onsemi 0:098463de4c5d 6 * modification, are permitted provided that the following conditions are met:
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * 1. Redistributions of source code must retain the above copyright notice,
group-onsemi 0:098463de4c5d 9 * this list of conditions and the following disclaimer.
group-onsemi 0:098463de4c5d 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
group-onsemi 0:098463de4c5d 11 * this list of conditions and the following disclaimer in the documentation
group-onsemi 0:098463de4c5d 12 * and/or other materials provided with the distribution.
group-onsemi 0:098463de4c5d 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
group-onsemi 0:098463de4c5d 14 * may be used to endorse or promote products derived from this software
group-onsemi 0:098463de4c5d 15 * without specific prior written permission.
group-onsemi 0:098463de4c5d 16 *
group-onsemi 0:098463de4c5d 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
group-onsemi 0:098463de4c5d 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
group-onsemi 0:098463de4c5d 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
group-onsemi 0:098463de4c5d 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
group-onsemi 0:098463de4c5d 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
group-onsemi 0:098463de4c5d 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
group-onsemi 0:098463de4c5d 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
group-onsemi 0:098463de4c5d 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
group-onsemi 0:098463de4c5d 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
group-onsemi 0:098463de4c5d 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
group-onsemi 0:098463de4c5d 27 */
group-onsemi 0:098463de4c5d 28 #include "mbed_assert.h"
group-onsemi 0:098463de4c5d 29 #include "analogout_api.h"
group-onsemi 0:098463de4c5d 30
group-onsemi 0:098463de4c5d 31 #if DEVICE_ANALOGOUT
group-onsemi 0:098463de4c5d 32
group-onsemi 0:098463de4c5d 33 #include "cmsis.h"
group-onsemi 0:098463de4c5d 34 #include "pinmap.h"
group-onsemi 0:098463de4c5d 35 #include "mbed_error.h"
group-onsemi 0:098463de4c5d 36 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 37
group-onsemi 0:098463de4c5d 38 #define DAC_RANGE (0xFFF) // 12 bits
group-onsemi 0:098463de4c5d 39 #define DAC_NB_BITS (12)
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 static DAC_HandleTypeDef DacHandle;
group-onsemi 0:098463de4c5d 42
group-onsemi 0:098463de4c5d 43 // These variables are used for the "free" function
group-onsemi 0:098463de4c5d 44 static int pa4_used = 0;
group-onsemi 0:098463de4c5d 45 static int pa5_used = 0;
group-onsemi 0:098463de4c5d 46
group-onsemi 0:098463de4c5d 47 void analogout_init(dac_t *obj, PinName pin) {
group-onsemi 0:098463de4c5d 48 DAC_ChannelConfTypeDef sConfig;
group-onsemi 0:098463de4c5d 49
group-onsemi 0:098463de4c5d 50 DacHandle.Instance = DAC;
group-onsemi 0:098463de4c5d 51
group-onsemi 0:098463de4c5d 52 // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
group-onsemi 0:098463de4c5d 53 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
group-onsemi 0:098463de4c5d 54 MBED_ASSERT(obj->dac != (DACName)NC);
group-onsemi 0:098463de4c5d 55
group-onsemi 0:098463de4c5d 56 // Configure GPIO
group-onsemi 0:098463de4c5d 57 pinmap_pinout(pin, PinMap_DAC);
group-onsemi 0:098463de4c5d 58
group-onsemi 0:098463de4c5d 59 // Save the channel for future use
group-onsemi 0:098463de4c5d 60 obj->pin = pin;
group-onsemi 0:098463de4c5d 61
group-onsemi 0:098463de4c5d 62 // Enable DAC clock
group-onsemi 0:098463de4c5d 63 __DAC_CLK_ENABLE();
group-onsemi 0:098463de4c5d 64
group-onsemi 0:098463de4c5d 65 // Configure DAC
group-onsemi 0:098463de4c5d 66 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
group-onsemi 0:098463de4c5d 67 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
group-onsemi 0:098463de4c5d 68
group-onsemi 0:098463de4c5d 69 if (pin == PA_4) {
group-onsemi 0:098463de4c5d 70 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
group-onsemi 0:098463de4c5d 71 pa4_used = 1;
group-onsemi 0:098463de4c5d 72 } else { // PA_5
group-onsemi 0:098463de4c5d 73 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2);
group-onsemi 0:098463de4c5d 74 pa5_used = 1;
group-onsemi 0:098463de4c5d 75 }
group-onsemi 0:098463de4c5d 76
group-onsemi 0:098463de4c5d 77 analogout_write_u16(obj, 0);
group-onsemi 0:098463de4c5d 78 }
group-onsemi 0:098463de4c5d 79
group-onsemi 0:098463de4c5d 80 void analogout_free(dac_t *obj) {
group-onsemi 0:098463de4c5d 81 // Reset DAC and disable clock
group-onsemi 0:098463de4c5d 82 if (obj->pin == PA_4) pa4_used = 0;
group-onsemi 0:098463de4c5d 83 if (obj->pin == PA_5) pa5_used = 0;
group-onsemi 0:098463de4c5d 84 if ((pa4_used == 0) && (pa5_used == 0)) {
group-onsemi 0:098463de4c5d 85 __DAC_FORCE_RESET();
group-onsemi 0:098463de4c5d 86 __DAC_RELEASE_RESET();
group-onsemi 0:098463de4c5d 87 __DAC_CLK_DISABLE();
group-onsemi 0:098463de4c5d 88 }
group-onsemi 0:098463de4c5d 89
group-onsemi 0:098463de4c5d 90 // Configure GPIO
group-onsemi 0:098463de4c5d 91 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
group-onsemi 0:098463de4c5d 92 }
group-onsemi 0:098463de4c5d 93
group-onsemi 0:098463de4c5d 94 static inline void dac_write(dac_t *obj, int value) {
group-onsemi 0:098463de4c5d 95 if (obj->pin == PA_4) {
group-onsemi 0:098463de4c5d 96 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
group-onsemi 0:098463de4c5d 97 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
group-onsemi 0:098463de4c5d 98 } else { // PA_5
group-onsemi 0:098463de4c5d 99 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
group-onsemi 0:098463de4c5d 100 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
group-onsemi 0:098463de4c5d 101 }
group-onsemi 0:098463de4c5d 102 }
group-onsemi 0:098463de4c5d 103
group-onsemi 0:098463de4c5d 104 static inline int dac_read(dac_t *obj) {
group-onsemi 0:098463de4c5d 105 if (obj->pin == PA_4) {
group-onsemi 0:098463de4c5d 106 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
group-onsemi 0:098463de4c5d 107 } else { // PA_5
group-onsemi 0:098463de4c5d 108 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
group-onsemi 0:098463de4c5d 109 }
group-onsemi 0:098463de4c5d 110 }
group-onsemi 0:098463de4c5d 111
group-onsemi 0:098463de4c5d 112 void analogout_write(dac_t *obj, float value) {
group-onsemi 0:098463de4c5d 113 if (value < 0.0f) {
group-onsemi 0:098463de4c5d 114 dac_write(obj, 0); // Min value
group-onsemi 0:098463de4c5d 115 } else if (value > 1.0f) {
group-onsemi 0:098463de4c5d 116 dac_write(obj, (int)DAC_RANGE); // Max value
group-onsemi 0:098463de4c5d 117 } else {
group-onsemi 0:098463de4c5d 118 dac_write(obj, (int)(value * (float)DAC_RANGE));
group-onsemi 0:098463de4c5d 119 }
group-onsemi 0:098463de4c5d 120 }
group-onsemi 0:098463de4c5d 121
group-onsemi 0:098463de4c5d 122 void analogout_write_u16(dac_t *obj, uint16_t value) {
group-onsemi 0:098463de4c5d 123 dac_write(obj, value >> (16 - DAC_NB_BITS));
group-onsemi 0:098463de4c5d 124 }
group-onsemi 0:098463de4c5d 125
group-onsemi 0:098463de4c5d 126 float analogout_read(dac_t *obj) {
group-onsemi 0:098463de4c5d 127 uint32_t value = dac_read(obj);
group-onsemi 0:098463de4c5d 128 return (float)value * (1.0f / (float)DAC_RANGE);
group-onsemi 0:098463de4c5d 129 }
group-onsemi 0:098463de4c5d 130
group-onsemi 0:098463de4c5d 131 uint16_t analogout_read_u16(dac_t *obj) {
group-onsemi 0:098463de4c5d 132 uint32_t value = dac_read(obj);
group-onsemi 0:098463de4c5d 133 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
group-onsemi 0:098463de4c5d 134 }
group-onsemi 0:098463de4c5d 135
group-onsemi 0:098463de4c5d 136 #endif // DEVICE_ANALOGOUT