Johannes Stratmann / mbed-dev

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targets/hal/TARGET_STM/TARGET_STM32F0/analogout_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015, 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 void analogout_init(dac_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 44 DAC_ChannelConfTypeDef sConfig;
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 // Get the peripheral name from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 47 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 48 MBED_ASSERT(obj->dac != (DACName)NC);
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 // Get the pin function and assign the used channel to the object
<> 144:ef7eb2e8f9f7 51 uint32_t function = pinmap_function(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 52 MBED_ASSERT(function != (uint32_t)NC);
<> 144:ef7eb2e8f9f7 53 obj->channel = STM_PIN_CHANNEL(function);
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 // Configure GPIO
<> 144:ef7eb2e8f9f7 56 pinmap_pinout(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 // Save the pin for future use
<> 144:ef7eb2e8f9f7 59 obj->pin = pin;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 // Enable DAC clock
<> 144:ef7eb2e8f9f7 62 __DAC1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 // Configure DAC
<> 144:ef7eb2e8f9f7 65 DacHandle.Instance = (DAC_TypeDef *)(obj->dac);
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
<> 144:ef7eb2e8f9f7 68 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 if (pin == PA_4) {
<> 144:ef7eb2e8f9f7 71 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 72 } else { // PA_5
<> 144:ef7eb2e8f9f7 73 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 74 }
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 analogout_write_u16(obj, 0);
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 void analogout_free(dac_t *obj) {
<> 144:ef7eb2e8f9f7 80 // Reset DAC and disable clock
<> 144:ef7eb2e8f9f7 81 __DAC1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 82 __DAC1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 83 __DAC1_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 // Configure GPIO
<> 144:ef7eb2e8f9f7 86 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 87 }
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 static inline void dac_write(dac_t *obj, int value) {
<> 144:ef7eb2e8f9f7 90 if (obj->channel == 1) {
<> 144:ef7eb2e8f9f7 91 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
<> 144:ef7eb2e8f9f7 92 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 93 }
<> 144:ef7eb2e8f9f7 94 #if defined(DAC_CHANNEL_2)
<> 144:ef7eb2e8f9f7 95 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 96 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
<> 144:ef7eb2e8f9f7 97 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 98 }
<> 144:ef7eb2e8f9f7 99 #endif
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 static inline int dac_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 103 if (obj->channel == 1) {
<> 144:ef7eb2e8f9f7 104 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 105 }
<> 144:ef7eb2e8f9f7 106 #if defined(DAC_CHANNEL_2)
<> 144:ef7eb2e8f9f7 107 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 108 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 109 }
<> 144:ef7eb2e8f9f7 110 #endif
<> 144:ef7eb2e8f9f7 111 return 0;
<> 144:ef7eb2e8f9f7 112 }
<> 144:ef7eb2e8f9f7 113
<> 144:ef7eb2e8f9f7 114 void analogout_write(dac_t *obj, float value) {
<> 144:ef7eb2e8f9f7 115 if (value < 0.0f) {
<> 144:ef7eb2e8f9f7 116 dac_write(obj, 0); // Min value
<> 144:ef7eb2e8f9f7 117 } else if (value > 1.0f) {
<> 144:ef7eb2e8f9f7 118 dac_write(obj, (int)DAC_RANGE); // Max value
<> 144:ef7eb2e8f9f7 119 } else {
<> 144:ef7eb2e8f9f7 120 dac_write(obj, (int)(value * (float)DAC_RANGE));
<> 144:ef7eb2e8f9f7 121 }
<> 144:ef7eb2e8f9f7 122 }
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 void analogout_write_u16(dac_t *obj, uint16_t value) {
<> 144:ef7eb2e8f9f7 125 dac_write(obj, value >> (16 - DAC_NB_BITS));
<> 144:ef7eb2e8f9f7 126 }
<> 144:ef7eb2e8f9f7 127
<> 144:ef7eb2e8f9f7 128 float analogout_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 129 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 130 return (float)value * (1.0f / (float)DAC_RANGE);
<> 144:ef7eb2e8f9f7 131 }
<> 144:ef7eb2e8f9f7 132
<> 144:ef7eb2e8f9f7 133 uint16_t analogout_read_u16(dac_t *obj) {
<> 144:ef7eb2e8f9f7 134 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 135 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
<> 144:ef7eb2e8f9f7 136 }
<> 144:ef7eb2e8f9f7 137
<> 144:ef7eb2e8f9f7 138 #endif // DEVICE_ANALOGOUT