b luo / mbed-dev

mbed library sources. With a patch for the can_api

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L4/analogout_api.c@151:91825d030f9b, 2016-11-14 (annotated)

Committer:
DangerousElectrician
Date:
Mon Nov 14 04:39:23 2016 +0000
Revision:
151:91825d030f9b
Parent:
149:156823d33999 
stuff changed?

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 // These variables are used for the "free" function
<> 144:ef7eb2e8f9f7 44 static int channel1_used = 0;
<> 144:ef7eb2e8f9f7 45 static int channel2_used = 0;
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 void analogout_init(dac_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 48 DAC_ChannelConfTypeDef sConfig = {0};
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 // Get the peripheral name from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 51 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 52 MBED_ASSERT(obj->dac != (DACName)NC);
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 // Get the pin function and assign the used channel to the object
<> 144:ef7eb2e8f9f7 55 uint32_t function = pinmap_function(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 56 MBED_ASSERT(function != (uint32_t)NC);
<> 144:ef7eb2e8f9f7 57 obj->channel = STM_PIN_CHANNEL(function);
<> 144:ef7eb2e8f9f7 58
<> 144:ef7eb2e8f9f7 59 // Configure GPIO
<> 144:ef7eb2e8f9f7 60 pinmap_pinout(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 // Save the pin for future use
<> 144:ef7eb2e8f9f7 63 obj->pin = pin;
<> 144:ef7eb2e8f9f7 64
<> 144:ef7eb2e8f9f7 65 // Enable DAC clock
<> 144:ef7eb2e8f9f7 66 __HAL_RCC_DAC1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 67
<> 144:ef7eb2e8f9f7 68 // Configure DAC
<> 144:ef7eb2e8f9f7 69 DacHandle.Instance = DAC;
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 if (HAL_DAC_Init(&DacHandle) != HAL_OK) {
<> 144:ef7eb2e8f9f7 72 error("Cannot initialize DAC\n");
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
<> 144:ef7eb2e8f9f7 76 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
<> 144:ef7eb2e8f9f7 77 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
<> 144:ef7eb2e8f9f7 78 sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_DISABLE;
<> 144:ef7eb2e8f9f7 79 sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
<> 144:ef7eb2e8f9f7 80
<> 144:ef7eb2e8f9f7 81 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 82 if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2) != HAL_OK) {
<> 144:ef7eb2e8f9f7 83 error("Cannot configure DAC channel 2\n");
<> 144:ef7eb2e8f9f7 84 }
<> 144:ef7eb2e8f9f7 85 channel2_used = 1;
<> 144:ef7eb2e8f9f7 86 } else { // channel 1 per default
<> 144:ef7eb2e8f9f7 87 if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1) != HAL_OK) {
<> 144:ef7eb2e8f9f7 88 error("Cannot configure DAC channel 1\n");
<> 144:ef7eb2e8f9f7 89 }
<> 144:ef7eb2e8f9f7 90 obj->channel = 1;
<> 144:ef7eb2e8f9f7 91 channel1_used = 1;
<> 144:ef7eb2e8f9f7 92 }
<> 144:ef7eb2e8f9f7 93
<> 144:ef7eb2e8f9f7 94 analogout_write_u16(obj, 0);
<> 144:ef7eb2e8f9f7 95 }
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 void analogout_free(dac_t *obj) {
<> 144:ef7eb2e8f9f7 98 // Reset DAC and disable clock
<> 144:ef7eb2e8f9f7 99 if (obj->channel == 1) channel1_used = 0;
<> 144:ef7eb2e8f9f7 100 if (obj->channel == 2) channel2_used = 0;
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 if ((channel1_used == 0) && (channel2_used == 0)) {
<> 144:ef7eb2e8f9f7 103 __HAL_RCC_DAC1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 104 __HAL_RCC_DAC1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 105 __HAL_RCC_DAC1_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 106 }
<> 144:ef7eb2e8f9f7 107
<> 144:ef7eb2e8f9f7 108 // Configure GPIO
<> 144:ef7eb2e8f9f7 109 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 110 }
<> 144:ef7eb2e8f9f7 111
<> 144:ef7eb2e8f9f7 112 static inline void dac_write(dac_t *obj, int value) {
<> 144:ef7eb2e8f9f7 113 if (obj->channel == 1) {
<> 144:ef7eb2e8f9f7 114 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
<> 144:ef7eb2e8f9f7 115 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 116 }
<> 144:ef7eb2e8f9f7 117 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 118 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
<> 144:ef7eb2e8f9f7 119 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 120 }
<> 144:ef7eb2e8f9f7 121 }
<> 144:ef7eb2e8f9f7 122
<> 144:ef7eb2e8f9f7 123 static inline int dac_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 124 if (obj->channel == 1) {
<> 144:ef7eb2e8f9f7 125 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 126 }
<> 144:ef7eb2e8f9f7 127 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 128 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 129 }
<> 144:ef7eb2e8f9f7 130 return 0;
<> 144:ef7eb2e8f9f7 131 }
<> 144:ef7eb2e8f9f7 132
<> 144:ef7eb2e8f9f7 133 void analogout_write(dac_t *obj, float value) {
<> 144:ef7eb2e8f9f7 134 if (value < 0.0f) {
<> 144:ef7eb2e8f9f7 135 dac_write(obj, 0); // Min value
<> 144:ef7eb2e8f9f7 136 } else if (value > 1.0f) {
<> 144:ef7eb2e8f9f7 137 dac_write(obj, (int)DAC_RANGE); // Max value
<> 144:ef7eb2e8f9f7 138 } else {
<> 144:ef7eb2e8f9f7 139 dac_write(obj, (int)(value * (float)DAC_RANGE));
<> 144:ef7eb2e8f9f7 140 }
<> 144:ef7eb2e8f9f7 141 }
<> 144:ef7eb2e8f9f7 142
<> 144:ef7eb2e8f9f7 143 void analogout_write_u16(dac_t *obj, uint16_t value) {
<> 144:ef7eb2e8f9f7 144 dac_write(obj, value >> (16 - DAC_NB_BITS));
<> 144:ef7eb2e8f9f7 145 }
<> 144:ef7eb2e8f9f7 146
<> 144:ef7eb2e8f9f7 147 float analogout_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 148 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 149 return (float)value * (1.0f / (float)DAC_RANGE);
<> 144:ef7eb2e8f9f7 150 }
<> 144:ef7eb2e8f9f7 151
<> 144:ef7eb2e8f9f7 152 uint16_t analogout_read_u16(dac_t *obj) {
<> 144:ef7eb2e8f9f7 153 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 154 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
<> 144:ef7eb2e8f9f7 155 }
<> 144:ef7eb2e8f9f7 156
<> 144:ef7eb2e8f9f7 157 #endif // DEVICE_ANALOGOUT