gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_L053C8/analogout_api.c@376:cb4d9db17537, 2014-10-31 (annotated)

Committer:
mbed_official
Date:
Fri Oct 31 11:00:10 2014 +0000
Revision:
376:cb4d9db17537
Child:
439:c4382fcbbaed
Synchronized with git revision 07b49da75eac883fc8916d3d6b6962664b8db29e



Full URL: https://github.com/mbedmicro/mbed/commit/07b49da75eac883fc8916d3d6b6962664b8db29e/



Targets: DISCO_L053C8 - new platform - STM32L0 Discovery board

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 376:cb4d9db17537 1 /* mbed Microcontroller Library
mbed_official 376:cb4d9db17537 2 * Copyright (c) 2014, STMicroelectronics
mbed_official 376:cb4d9db17537 3 * All rights reserved.
mbed_official 376:cb4d9db17537 4 *
mbed_official 376:cb4d9db17537 5 * Redistribution and use in source and binary forms, with or without
mbed_official 376:cb4d9db17537 6 * modification, are permitted provided that the following conditions are met:
mbed_official 376:cb4d9db17537 7 *
mbed_official 376:cb4d9db17537 8 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 376:cb4d9db17537 9 * this list of conditions and the following disclaimer.
mbed_official 376:cb4d9db17537 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 376:cb4d9db17537 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 376:cb4d9db17537 12 * and/or other materials provided with the distribution.
mbed_official 376:cb4d9db17537 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 376:cb4d9db17537 14 * may be used to endorse or promote products derived from this software
mbed_official 376:cb4d9db17537 15 * without specific prior written permission.
mbed_official 376:cb4d9db17537 16 *
mbed_official 376:cb4d9db17537 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 376:cb4d9db17537 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 376:cb4d9db17537 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 376:cb4d9db17537 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 376:cb4d9db17537 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 376:cb4d9db17537 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 376:cb4d9db17537 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 376:cb4d9db17537 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 376:cb4d9db17537 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 376:cb4d9db17537 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 376:cb4d9db17537 27 */
mbed_official 376:cb4d9db17537 28 #include "mbed_assert.h"
mbed_official 376:cb4d9db17537 29 #include "analogout_api.h"
mbed_official 376:cb4d9db17537 30
mbed_official 376:cb4d9db17537 31 #if DEVICE_ANALOGOUT
mbed_official 376:cb4d9db17537 32
mbed_official 376:cb4d9db17537 33 #include "cmsis.h"
mbed_official 376:cb4d9db17537 34 #include "pinmap.h"
mbed_official 376:cb4d9db17537 35 #include "mbed_error.h"
mbed_official 376:cb4d9db17537 36
mbed_official 376:cb4d9db17537 37 #define DAC_RANGE (0xFFF) // 12 bits
mbed_official 376:cb4d9db17537 38
mbed_official 376:cb4d9db17537 39 static const PinMap PinMap_DAC[] = {
mbed_official 376:cb4d9db17537 40 {PA_4, DAC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // DAC_OUT
mbed_official 376:cb4d9db17537 41 {NC, NC, 0}
mbed_official 376:cb4d9db17537 42 };
mbed_official 376:cb4d9db17537 43
mbed_official 376:cb4d9db17537 44 static DAC_HandleTypeDef DacHandle;
mbed_official 376:cb4d9db17537 45
mbed_official 376:cb4d9db17537 46 void analogout_init(dac_t *obj, PinName pin) {
mbed_official 376:cb4d9db17537 47 DAC_ChannelConfTypeDef sConfig;
mbed_official 376:cb4d9db17537 48
mbed_official 376:cb4d9db17537 49 DacHandle.Instance = DAC;
mbed_official 376:cb4d9db17537 50
mbed_official 376:cb4d9db17537 51 // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
mbed_official 376:cb4d9db17537 52 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
mbed_official 376:cb4d9db17537 53 MBED_ASSERT(obj->dac != (DACName)NC);
mbed_official 376:cb4d9db17537 54
mbed_official 376:cb4d9db17537 55 // Configure GPIO
mbed_official 376:cb4d9db17537 56 pinmap_pinout(pin, PinMap_DAC);
mbed_official 376:cb4d9db17537 57
mbed_official 376:cb4d9db17537 58 // Save the channel for future use
mbed_official 376:cb4d9db17537 59 obj->pin = pin;
mbed_official 376:cb4d9db17537 60
mbed_official 376:cb4d9db17537 61 // Enable DAC clock
mbed_official 376:cb4d9db17537 62 __DAC_CLK_ENABLE();
mbed_official 376:cb4d9db17537 63
mbed_official 376:cb4d9db17537 64 // Configure DAC
mbed_official 376:cb4d9db17537 65 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
mbed_official 376:cb4d9db17537 66 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
mbed_official 376:cb4d9db17537 67
mbed_official 376:cb4d9db17537 68 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
mbed_official 376:cb4d9db17537 69
mbed_official 376:cb4d9db17537 70 analogout_write_u16(obj, 0);
mbed_official 376:cb4d9db17537 71 }
mbed_official 376:cb4d9db17537 72
mbed_official 376:cb4d9db17537 73 void analogout_free(dac_t *obj) {
mbed_official 376:cb4d9db17537 74 // Reset DAC and disable clock
mbed_official 376:cb4d9db17537 75 __DAC_FORCE_RESET();
mbed_official 376:cb4d9db17537 76 __DAC_RELEASE_RESET();
mbed_official 376:cb4d9db17537 77 __DAC_CLK_DISABLE();
mbed_official 376:cb4d9db17537 78
mbed_official 376:cb4d9db17537 79 // Configure GPIO
mbed_official 376:cb4d9db17537 80 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 376:cb4d9db17537 81 }
mbed_official 376:cb4d9db17537 82
mbed_official 376:cb4d9db17537 83 static inline void dac_write(dac_t *obj, uint16_t value) {
mbed_official 376:cb4d9db17537 84 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value);
mbed_official 376:cb4d9db17537 85 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
mbed_official 376:cb4d9db17537 86 }
mbed_official 376:cb4d9db17537 87
mbed_official 376:cb4d9db17537 88 static inline int dac_read(dac_t *obj) {
mbed_official 376:cb4d9db17537 89 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
mbed_official 376:cb4d9db17537 90 }
mbed_official 376:cb4d9db17537 91
mbed_official 376:cb4d9db17537 92 void analogout_write(dac_t *obj, float value) {
mbed_official 376:cb4d9db17537 93 if (value < 0.0f) {
mbed_official 376:cb4d9db17537 94 dac_write(obj, 0); // Min value
mbed_official 376:cb4d9db17537 95 } else if (value > 1.0f) {
mbed_official 376:cb4d9db17537 96 dac_write(obj, (uint16_t)DAC_RANGE); // Max value
mbed_official 376:cb4d9db17537 97 } else {
mbed_official 376:cb4d9db17537 98 dac_write(obj, (uint16_t)(value * (float)DAC_RANGE));
mbed_official 376:cb4d9db17537 99 }
mbed_official 376:cb4d9db17537 100 }
mbed_official 376:cb4d9db17537 101
mbed_official 376:cb4d9db17537 102 void analogout_write_u16(dac_t *obj, uint16_t value) {
mbed_official 376:cb4d9db17537 103 if (value > (uint16_t)DAC_RANGE) {
mbed_official 376:cb4d9db17537 104 dac_write(obj, (uint16_t)DAC_RANGE); // Max value
mbed_official 376:cb4d9db17537 105 } else {
mbed_official 376:cb4d9db17537 106 dac_write(obj, value);
mbed_official 376:cb4d9db17537 107 }
mbed_official 376:cb4d9db17537 108 }
mbed_official 376:cb4d9db17537 109
mbed_official 376:cb4d9db17537 110 float analogout_read(dac_t *obj) {
mbed_official 376:cb4d9db17537 111 uint32_t value = dac_read(obj);
mbed_official 376:cb4d9db17537 112 return (float)((float)value * (1.0f / (float)DAC_RANGE));
mbed_official 376:cb4d9db17537 113 }
mbed_official 376:cb4d9db17537 114
mbed_official 376:cb4d9db17537 115 uint16_t analogout_read_u16(dac_t *obj) {
mbed_official 376:cb4d9db17537 116 return (uint16_t)dac_read(obj);
mbed_official 376:cb4d9db17537 117 }
mbed_official 376:cb4d9db17537 118
mbed_official 376:cb4d9db17537 119 #endif // DEVICE_ANALOGOUT