Ermanno Brusadin / mbed

mbed library sources

Dependents:   FRDM-KL46Z_LCD_Test FRDM-KL46Z_LCD_Test FRDM-KL46Z_Plantilla FRDM-KL46Z_Plantilla ... more

targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/analogout_api.c@0:6bc4ac881c8e, 2016-07-28 (annotated)

Committer:
ebrus
Date:
Thu Jul 28 15:56:34 2016 +0000
Revision:
0:6bc4ac881c8e
1;

Who changed what in which revision?

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ebrus 0:6bc4ac881c8e 1 /* mbed Microcontroller Library
ebrus 0:6bc4ac881c8e 2 * Copyright (c) 2014, STMicroelectronics
ebrus 0:6bc4ac881c8e 3 * All rights reserved.
ebrus 0:6bc4ac881c8e 4 *
ebrus 0:6bc4ac881c8e 5 * Redistribution and use in source and binary forms, with or without
ebrus 0:6bc4ac881c8e 6 * modification, are permitted provided that the following conditions are met:
ebrus 0:6bc4ac881c8e 7 *
ebrus 0:6bc4ac881c8e 8 * 1. Redistributions of source code must retain the above copyright notice,
ebrus 0:6bc4ac881c8e 9 * this list of conditions and the following disclaimer.
ebrus 0:6bc4ac881c8e 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
ebrus 0:6bc4ac881c8e 11 * this list of conditions and the following disclaimer in the documentation
ebrus 0:6bc4ac881c8e 12 * and/or other materials provided with the distribution.
ebrus 0:6bc4ac881c8e 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
ebrus 0:6bc4ac881c8e 14 * may be used to endorse or promote products derived from this software
ebrus 0:6bc4ac881c8e 15 * without specific prior written permission.
ebrus 0:6bc4ac881c8e 16 *
ebrus 0:6bc4ac881c8e 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
ebrus 0:6bc4ac881c8e 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ebrus 0:6bc4ac881c8e 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
ebrus 0:6bc4ac881c8e 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
ebrus 0:6bc4ac881c8e 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ebrus 0:6bc4ac881c8e 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
ebrus 0:6bc4ac881c8e 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
ebrus 0:6bc4ac881c8e 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
ebrus 0:6bc4ac881c8e 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
ebrus 0:6bc4ac881c8e 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ebrus 0:6bc4ac881c8e 27 */
ebrus 0:6bc4ac881c8e 28 #include "mbed_assert.h"
ebrus 0:6bc4ac881c8e 29 #include "analogout_api.h"
ebrus 0:6bc4ac881c8e 30
ebrus 0:6bc4ac881c8e 31 #if DEVICE_ANALOGOUT
ebrus 0:6bc4ac881c8e 32
ebrus 0:6bc4ac881c8e 33 #include "cmsis.h"
ebrus 0:6bc4ac881c8e 34 #include "pinmap.h"
ebrus 0:6bc4ac881c8e 35 #include "mbed_error.h"
ebrus 0:6bc4ac881c8e 36
ebrus 0:6bc4ac881c8e 37 #define DAC_RANGE (0xFFF) // 12 bits
ebrus 0:6bc4ac881c8e 38
ebrus 0:6bc4ac881c8e 39 static const PinMap PinMap_DAC[] = {
ebrus 0:6bc4ac881c8e 40 {PA_4, DAC_1, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0)}, // DAC_OUT
ebrus 0:6bc4ac881c8e 41 {NC, NC, 0}
ebrus 0:6bc4ac881c8e 42 };
ebrus 0:6bc4ac881c8e 43
ebrus 0:6bc4ac881c8e 44 static DAC_HandleTypeDef DacHandle;
ebrus 0:6bc4ac881c8e 45
ebrus 0:6bc4ac881c8e 46 void analogout_init(dac_t *obj, PinName pin) {
ebrus 0:6bc4ac881c8e 47 DAC_ChannelConfTypeDef sConfig;
ebrus 0:6bc4ac881c8e 48
ebrus 0:6bc4ac881c8e 49 DacHandle.Instance = DAC;
ebrus 0:6bc4ac881c8e 50
ebrus 0:6bc4ac881c8e 51 // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
ebrus 0:6bc4ac881c8e 52 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
ebrus 0:6bc4ac881c8e 53 MBED_ASSERT(obj->dac != (DACName)NC);
ebrus 0:6bc4ac881c8e 54
ebrus 0:6bc4ac881c8e 55 // Configure GPIO
ebrus 0:6bc4ac881c8e 56 pinmap_pinout(pin, PinMap_DAC);
ebrus 0:6bc4ac881c8e 57
ebrus 0:6bc4ac881c8e 58 // Save the channel for future use
ebrus 0:6bc4ac881c8e 59 obj->pin = pin;
ebrus 0:6bc4ac881c8e 60
ebrus 0:6bc4ac881c8e 61 // Enable DAC clock
ebrus 0:6bc4ac881c8e 62 __DAC_CLK_ENABLE();
ebrus 0:6bc4ac881c8e 63
ebrus 0:6bc4ac881c8e 64 // Configure DAC
ebrus 0:6bc4ac881c8e 65 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
ebrus 0:6bc4ac881c8e 66 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
ebrus 0:6bc4ac881c8e 67
ebrus 0:6bc4ac881c8e 68 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
ebrus 0:6bc4ac881c8e 69
ebrus 0:6bc4ac881c8e 70 analogout_write_u16(obj, 0);
ebrus 0:6bc4ac881c8e 71 }
ebrus 0:6bc4ac881c8e 72
ebrus 0:6bc4ac881c8e 73 void analogout_free(dac_t *obj) {
ebrus 0:6bc4ac881c8e 74 // Reset DAC and disable clock
ebrus 0:6bc4ac881c8e 75 __DAC_FORCE_RESET();
ebrus 0:6bc4ac881c8e 76 __DAC_RELEASE_RESET();
ebrus 0:6bc4ac881c8e 77 __DAC_CLK_DISABLE();
ebrus 0:6bc4ac881c8e 78
ebrus 0:6bc4ac881c8e 79 // Configure GPIO
ebrus 0:6bc4ac881c8e 80 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
ebrus 0:6bc4ac881c8e 81 }
ebrus 0:6bc4ac881c8e 82
ebrus 0:6bc4ac881c8e 83 static inline void dac_write(dac_t *obj, uint16_t value) {
ebrus 0:6bc4ac881c8e 84 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value);
ebrus 0:6bc4ac881c8e 85 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
ebrus 0:6bc4ac881c8e 86 }
ebrus 0:6bc4ac881c8e 87
ebrus 0:6bc4ac881c8e 88 static inline int dac_read(dac_t *obj) {
ebrus 0:6bc4ac881c8e 89 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
ebrus 0:6bc4ac881c8e 90 }
ebrus 0:6bc4ac881c8e 91
ebrus 0:6bc4ac881c8e 92 void analogout_write(dac_t *obj, float value) {
ebrus 0:6bc4ac881c8e 93 if (value < 0.0f) {
ebrus 0:6bc4ac881c8e 94 dac_write(obj, 0); // Min value
ebrus 0:6bc4ac881c8e 95 } else if (value > 1.0f) {
ebrus 0:6bc4ac881c8e 96 dac_write(obj, (uint16_t)DAC_RANGE); // Max value
ebrus 0:6bc4ac881c8e 97 } else {
ebrus 0:6bc4ac881c8e 98 dac_write(obj, (uint16_t)(value * (float)DAC_RANGE));
ebrus 0:6bc4ac881c8e 99 }
ebrus 0:6bc4ac881c8e 100 }
ebrus 0:6bc4ac881c8e 101
ebrus 0:6bc4ac881c8e 102 void analogout_write_u16(dac_t *obj, uint16_t value) {
ebrus 0:6bc4ac881c8e 103 if (value > (uint16_t)DAC_RANGE) {
ebrus 0:6bc4ac881c8e 104 dac_write(obj, (uint16_t)DAC_RANGE); // Max value
ebrus 0:6bc4ac881c8e 105 } else {
ebrus 0:6bc4ac881c8e 106 dac_write(obj, value);
ebrus 0:6bc4ac881c8e 107 }
ebrus 0:6bc4ac881c8e 108 }
ebrus 0:6bc4ac881c8e 109
ebrus 0:6bc4ac881c8e 110 float analogout_read(dac_t *obj) {
ebrus 0:6bc4ac881c8e 111 uint32_t value = dac_read(obj);
ebrus 0:6bc4ac881c8e 112 return (float)((float)value * (1.0f / (float)DAC_RANGE));
ebrus 0:6bc4ac881c8e 113 }
ebrus 0:6bc4ac881c8e 114
ebrus 0:6bc4ac881c8e 115 uint16_t analogout_read_u16(dac_t *obj) {
ebrus 0:6bc4ac881c8e 116 return (uint16_t)dac_read(obj);
ebrus 0:6bc4ac881c8e 117 }
ebrus 0:6bc4ac881c8e 118
ebrus 0:6bc4ac881c8e 119 #endif // DEVICE_ANALOGOUT