teralytic / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed by teralytic

targets/hal/TARGET_STM/TARGET_STM32F0/analogout_api.c@8:69ce7aaad4c4, 2015-10-26 (annotated)

Committer:
mbed_official
Date:
Mon Oct 26 09:00:10 2015 +0000
Revision:
8:69ce7aaad4c4
Parent:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Synchronized with git revision 22ef4124357e8536842581c7afd8e0c2c7858d6f



Full URL: https://github.com/mbedmicro/mbed/commit/22ef4124357e8536842581c7afd8e0c2c7858d6f/



STM32xx -Fix analog_out issue with 12 to 16bits conversion

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
mbed_official 8:69ce7aaad4c4 39 #define DAC_NB_BITS (12)
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 static DAC_HandleTypeDef DacHandle;
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 void analogout_init(dac_t *obj, PinName pin) {
bogdanm 0:9b334a45a8ff 44 DAC_ChannelConfTypeDef sConfig;
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 DacHandle.Instance = DAC;
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
bogdanm 0:9b334a45a8ff 49 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 50 MBED_ASSERT(obj->dac != (DACName)NC);
bogdanm 0:9b334a45a8ff 51
bogdanm 0:9b334a45a8ff 52 // Configure GPIO
bogdanm 0:9b334a45a8ff 53 pinmap_pinout(pin, PinMap_DAC);
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 // Save the channel for future use
bogdanm 0:9b334a45a8ff 56 obj->pin = pin;
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 // Enable DAC clock
bogdanm 0:9b334a45a8ff 59 __DAC1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 // Configure DAC
bogdanm 0:9b334a45a8ff 62 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
bogdanm 0:9b334a45a8ff 63 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 if (pin == PA_4) {
bogdanm 0:9b334a45a8ff 66 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
bogdanm 0:9b334a45a8ff 67 } else { // PA_5
bogdanm 0:9b334a45a8ff 68 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2);
bogdanm 0:9b334a45a8ff 69 }
bogdanm 0:9b334a45a8ff 70
bogdanm 0:9b334a45a8ff 71 analogout_write_u16(obj, 0);
bogdanm 0:9b334a45a8ff 72 }
bogdanm 0:9b334a45a8ff 73
bogdanm 0:9b334a45a8ff 74 void analogout_free(dac_t *obj) {
bogdanm 0:9b334a45a8ff 75 // Reset DAC and disable clock
bogdanm 0:9b334a45a8ff 76 __DAC1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 77 __DAC1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 78 __DAC1_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 79
bogdanm 0:9b334a45a8ff 80 // Configure GPIO
bogdanm 0:9b334a45a8ff 81 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83
mbed_official 8:69ce7aaad4c4 84 static inline void dac_write(dac_t *obj, int value) {
bogdanm 0:9b334a45a8ff 85 if (obj->pin == PA_4) {
mbed_official 8:69ce7aaad4c4 86 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
bogdanm 0:9b334a45a8ff 87 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
mbed_official 8:69ce7aaad4c4 88 } else if (obj->pin == PA_5) {
mbed_official 8:69ce7aaad4c4 89 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
bogdanm 0:9b334a45a8ff 90 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92 }
bogdanm 0:9b334a45a8ff 93
bogdanm 0:9b334a45a8ff 94 static inline int dac_read(dac_t *obj) {
bogdanm 0:9b334a45a8ff 95 if (obj->pin == PA_4) {
bogdanm 0:9b334a45a8ff 96 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
mbed_official 8:69ce7aaad4c4 97 } else if (obj->pin == PA_5) {
bogdanm 0:9b334a45a8ff 98 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
bogdanm 0:9b334a45a8ff 99 }
mbed_official 8:69ce7aaad4c4 100 return 0; /* Just silented warning */
bogdanm 0:9b334a45a8ff 101 }
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 void analogout_write(dac_t *obj, float value) {
bogdanm 0:9b334a45a8ff 104 if (value < 0.0f) {
bogdanm 0:9b334a45a8ff 105 dac_write(obj, 0); // Min value
bogdanm 0:9b334a45a8ff 106 } else if (value > 1.0f) {
mbed_official 8:69ce7aaad4c4 107 dac_write(obj, (int)DAC_RANGE); // Max value
bogdanm 0:9b334a45a8ff 108 } else {
mbed_official 8:69ce7aaad4c4 109 dac_write(obj, (int)(value * (float)DAC_RANGE));
bogdanm 0:9b334a45a8ff 110 }
bogdanm 0:9b334a45a8ff 111 }
bogdanm 0:9b334a45a8ff 112
bogdanm 0:9b334a45a8ff 113 void analogout_write_u16(dac_t *obj, uint16_t value) {
mbed_official 8:69ce7aaad4c4 114 dac_write(obj, value >> (16 - DAC_NB_BITS));
bogdanm 0:9b334a45a8ff 115 }
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 float analogout_read(dac_t *obj) {
bogdanm 0:9b334a45a8ff 118 uint32_t value = dac_read(obj);
mbed_official 8:69ce7aaad4c4 119 return (float)value * (1.0f / (float)DAC_RANGE);
bogdanm 0:9b334a45a8ff 120 }
bogdanm 0:9b334a45a8ff 121
bogdanm 0:9b334a45a8ff 122 uint16_t analogout_read_u16(dac_t *obj) {
mbed_official 8:69ce7aaad4c4 123 uint32_t value = dac_read(obj);
mbed_official 8:69ce7aaad4c4 124 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
bogdanm 0:9b334a45a8ff 125 }
bogdanm 0:9b334a45a8ff 126
bogdanm 0:9b334a45a8ff 127 #endif // DEVICE_ANALOGOUT