Iftikhar Aziz / mbed-dev

4545

Dependents:   LSS_Rev_1

Fork of mbed-dev by Umar Naeem

targets/TARGET_STM/TARGET_STM32L1/analogout_api.c@166:33361e55dd8c, 2017-08-23 (annotated)

Committer:
iftaziz
Date:
Wed Aug 23 10:32:38 2017 +0000
Revision:
166:33361e55dd8c
Parent:
149:156823d33999 
r1

Who changed what in which revision?

UserRevisionLine numberNew 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