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targets/hal/TARGET_STM/TARGET_STM32L1/analogout_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
8:69ce7aaad4c4
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 * Copyright (c) 2014, STMicroelectronics
bogdanm 0:9b334a45a8ff 3 * All rights reserved.
bogdanm 0:9b334a45a8ff 4 *
bogdanm 0:9b334a45a8ff 5 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 6 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 7 *
bogdanm 0:9b334a45a8ff 8 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 9 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 11 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 12 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 14 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 15 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 16 *
bogdanm 0:9b334a45a8ff 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 27 */
bogdanm 0:9b334a45a8ff 28 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 29 #include "analogout_api.h"
bogdanm 0:9b334a45a8ff 30
bogdanm 0:9b334a45a8ff 31 #if DEVICE_ANALOGOUT
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 34 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 35 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 36 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 37
bogdanm 0:9b334a45a8ff 38 #define DAC_RANGE (0xFFF) // 12 bits
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 static DAC_HandleTypeDef DacHandle;
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 // These variables are used for the "free" function
bogdanm 0:9b334a45a8ff 43 static int pa4_used = 0;
bogdanm 0:9b334a45a8ff 44 static int pa5_used = 0;
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 void analogout_init(dac_t *obj, PinName pin)
bogdanm 0:9b334a45a8ff 47 {
bogdanm 0:9b334a45a8ff 48 DAC_ChannelConfTypeDef sConfig;
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 DacHandle.Instance = DAC;
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
bogdanm 0:9b334a45a8ff 53 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 54 MBED_ASSERT(obj->dac != (DACName)NC);
bogdanm 0:9b334a45a8ff 55
bogdanm 0:9b334a45a8ff 56 // Configure GPIO
bogdanm 0:9b334a45a8ff 57 pinmap_pinout(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 58
bogdanm 0:9b334a45a8ff 59 // Save the channel for future use
bogdanm 0:9b334a45a8ff 60 obj->pin = pin;
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 // Enable DAC clock
bogdanm 0:9b334a45a8ff 63 __DAC_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 // Configure DAC
bogdanm 0:9b334a45a8ff 66 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
bogdanm 0:9b334a45a8ff 67 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
bogdanm 0:9b334a45a8ff 68
bogdanm 0:9b334a45a8ff 69 if (pin == PA_4) {
bogdanm 0:9b334a45a8ff 70 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
bogdanm 0:9b334a45a8ff 71 pa4_used = 1;
bogdanm 0:9b334a45a8ff 72 } else { // PA_5
bogdanm 0:9b334a45a8ff 73 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2);
bogdanm 0:9b334a45a8ff 74 pa5_used = 1;
bogdanm 0:9b334a45a8ff 75 }
bogdanm 0:9b334a45a8ff 76
bogdanm 0:9b334a45a8ff 77 analogout_write_u16(obj, 0);
bogdanm 0:9b334a45a8ff 78 }
bogdanm 0:9b334a45a8ff 79
bogdanm 0:9b334a45a8ff 80 void analogout_free(dac_t *obj)
bogdanm 0:9b334a45a8ff 81 {
bogdanm 0:9b334a45a8ff 82 // Reset DAC and disable clock
bogdanm 0:9b334a45a8ff 83 if (obj->pin == PA_4) pa4_used = 0;
bogdanm 0:9b334a45a8ff 84 if (obj->pin == PA_5) pa5_used = 0;
bogdanm 0:9b334a45a8ff 85 if ((pa4_used == 0) && (pa5_used == 0)) {
bogdanm 0:9b334a45a8ff 86 __DAC_FORCE_RESET();
bogdanm 0:9b334a45a8ff 87 __DAC_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 88 __DAC_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 89 }
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 // Configure GPIO
bogdanm 0:9b334a45a8ff 92 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 93 }
bogdanm 0:9b334a45a8ff 94
bogdanm 0:9b334a45a8ff 95 static inline void dac_write(dac_t *obj, uint16_t value)
bogdanm 0:9b334a45a8ff 96 {
bogdanm 0:9b334a45a8ff 97 if (obj->pin == PA_4) {
bogdanm 0:9b334a45a8ff 98 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value);
bogdanm 0:9b334a45a8ff 99 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
bogdanm 0:9b334a45a8ff 100 } else { // PA_5
bogdanm 0:9b334a45a8ff 101 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, value);
bogdanm 0:9b334a45a8ff 102 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
bogdanm 0:9b334a45a8ff 103 }
bogdanm 0:9b334a45a8ff 104 }
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106 static inline int dac_read(dac_t *obj)
bogdanm 0:9b334a45a8ff 107 {
bogdanm 0:9b334a45a8ff 108 if (obj->pin == PA_4) {
bogdanm 0:9b334a45a8ff 109 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
bogdanm 0:9b334a45a8ff 110 } else { // PA_5
bogdanm 0:9b334a45a8ff 111 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
bogdanm 0:9b334a45a8ff 112 }
bogdanm 0:9b334a45a8ff 113 }
bogdanm 0:9b334a45a8ff 114
bogdanm 0:9b334a45a8ff 115 void analogout_write(dac_t *obj, float value)
bogdanm 0:9b334a45a8ff 116 {
bogdanm 0:9b334a45a8ff 117 if (value < 0.0f) {
bogdanm 0:9b334a45a8ff 118 dac_write(obj, 0); // Min value
bogdanm 0:9b334a45a8ff 119 } else if (value > 1.0f) {
bogdanm 0:9b334a45a8ff 120 dac_write(obj, (uint16_t)DAC_RANGE); // Max value
bogdanm 0:9b334a45a8ff 121 } else {
bogdanm 0:9b334a45a8ff 122 dac_write(obj, (uint16_t)(value * (float)DAC_RANGE));
bogdanm 0:9b334a45a8ff 123 }
bogdanm 0:9b334a45a8ff 124 }
bogdanm 0:9b334a45a8ff 125
bogdanm 0:9b334a45a8ff 126 void analogout_write_u16(dac_t *obj, uint16_t value)
bogdanm 0:9b334a45a8ff 127 {
bogdanm 0:9b334a45a8ff 128 if (value > (uint16_t)DAC_RANGE) {
bogdanm 0:9b334a45a8ff 129 dac_write(obj, (uint16_t)DAC_RANGE); // Max value
bogdanm 0:9b334a45a8ff 130 } else {
bogdanm 0:9b334a45a8ff 131 dac_write(obj, value);
bogdanm 0:9b334a45a8ff 132 }
bogdanm 0:9b334a45a8ff 133 }
bogdanm 0:9b334a45a8ff 134
bogdanm 0:9b334a45a8ff 135 float analogout_read(dac_t *obj)
bogdanm 0:9b334a45a8ff 136 {
bogdanm 0:9b334a45a8ff 137 uint32_t value = dac_read(obj);
bogdanm 0:9b334a45a8ff 138 return (float)((float)value * (1.0f / (float)DAC_RANGE));
bogdanm 0:9b334a45a8ff 139 }
bogdanm 0:9b334a45a8ff 140
bogdanm 0:9b334a45a8ff 141 uint16_t analogout_read_u16(dac_t *obj)
bogdanm 0:9b334a45a8ff 142 {
bogdanm 0:9b334a45a8ff 143 return (uint16_t)dac_read(obj);
bogdanm 0:9b334a45a8ff 144 }
bogdanm 0:9b334a45a8ff 145
bogdanm 0:9b334a45a8ff 146 #endif // DEVICE_ANALOGOUT