mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

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targets/TARGET_STM/TARGET_STM32L0/analogout_device.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
187:0387e8f68319 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 168:9672193075cf 1 /* mbed Microcontroller Library
AnnaBridge 168:9672193075cf 2 * Copyright (c) 2015, STMicroelectronics
AnnaBridge 168:9672193075cf 3 * All rights reserved.
AnnaBridge 168:9672193075cf 4 *
AnnaBridge 168:9672193075cf 5 * Redistribution and use in source and binary forms, with or without
AnnaBridge 168:9672193075cf 6 * modification, are permitted provided that the following conditions are met:
AnnaBridge 168:9672193075cf 7 *
AnnaBridge 168:9672193075cf 8 * 1. Redistributions of source code must retain the above copyright notice,
AnnaBridge 168:9672193075cf 9 * this list of conditions and the following disclaimer.
AnnaBridge 168:9672193075cf 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
AnnaBridge 168:9672193075cf 11 * this list of conditions and the following disclaimer in the documentation
AnnaBridge 168:9672193075cf 12 * and/or other materials provided with the distribution.
AnnaBridge 168:9672193075cf 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
AnnaBridge 168:9672193075cf 14 * may be used to endorse or promote products derived from this software
AnnaBridge 168:9672193075cf 15 * without specific prior written permission.
AnnaBridge 168:9672193075cf 16 *
AnnaBridge 168:9672193075cf 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AnnaBridge 168:9672193075cf 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AnnaBridge 168:9672193075cf 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
AnnaBridge 168:9672193075cf 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
AnnaBridge 168:9672193075cf 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AnnaBridge 168:9672193075cf 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
AnnaBridge 168:9672193075cf 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
AnnaBridge 168:9672193075cf 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
AnnaBridge 168:9672193075cf 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
AnnaBridge 168:9672193075cf 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
AnnaBridge 168:9672193075cf 27 */
AnnaBridge 168:9672193075cf 28 #include "mbed_assert.h"
AnnaBridge 168:9672193075cf 29 #include "analogout_api.h"
AnnaBridge 168:9672193075cf 30
AnnaBridge 168:9672193075cf 31 #if DEVICE_ANALOGOUT
AnnaBridge 168:9672193075cf 32
AnnaBridge 168:9672193075cf 33 #include "cmsis.h"
AnnaBridge 168:9672193075cf 34 #include "pinmap.h"
AnnaBridge 168:9672193075cf 35 #include "mbed_error.h"
AnnaBridge 168:9672193075cf 36 #include "PeripheralPins.h"
AnnaBridge 168:9672193075cf 37
AnnaBridge 168:9672193075cf 38 // These variables are used for the "free" function
AnnaBridge 168:9672193075cf 39 static int channel1_used = 0;
AnnaBridge 168:9672193075cf 40 static int channel2_used = 0;
AnnaBridge 168:9672193075cf 41
AnnaBridge 187:0387e8f68319 42 void analogout_init(dac_t *obj, PinName pin)
AnnaBridge 187:0387e8f68319 43 {
AnnaBridge 176:447f873cad2f 44 DAC_ChannelConfTypeDef sConfig = {0};
AnnaBridge 168:9672193075cf 45
AnnaBridge 168:9672193075cf 46 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 168:9672193075cf 47 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
AnnaBridge 168:9672193075cf 48 MBED_ASSERT(obj->dac != (DACName)NC);
AnnaBridge 168:9672193075cf 49
AnnaBridge 168:9672193075cf 50 // Get the pin function and assign the used channel to the object
AnnaBridge 168:9672193075cf 51 uint32_t function = pinmap_function(pin, PinMap_DAC);
AnnaBridge 168:9672193075cf 52 MBED_ASSERT(function != (uint32_t)NC);
AnnaBridge 168:9672193075cf 53 switch (STM_PIN_CHANNEL(function)) {
AnnaBridge 168:9672193075cf 54 case 1:
AnnaBridge 168:9672193075cf 55 obj->channel = DAC_CHANNEL_1;
AnnaBridge 168:9672193075cf 56 break;
AnnaBridge 168:9672193075cf 57 #if defined(DAC_CHANNEL_2)
AnnaBridge 168:9672193075cf 58 case 2:
AnnaBridge 168:9672193075cf 59 obj->channel = DAC_CHANNEL_2;
AnnaBridge 168:9672193075cf 60 break;
AnnaBridge 168:9672193075cf 61 #endif
AnnaBridge 168:9672193075cf 62 default:
AnnaBridge 168:9672193075cf 63 error("Unknown DAC channel");
AnnaBridge 168:9672193075cf 64 break;
AnnaBridge 168:9672193075cf 65 }
AnnaBridge 168:9672193075cf 66
AnnaBridge 168:9672193075cf 67 // Configure GPIO
AnnaBridge 168:9672193075cf 68 pinmap_pinout(pin, PinMap_DAC);
AnnaBridge 168:9672193075cf 69
AnnaBridge 168:9672193075cf 70 // Save the pin for future use
AnnaBridge 168:9672193075cf 71 obj->pin = pin;
AnnaBridge 168:9672193075cf 72
AnnaBridge 168:9672193075cf 73 // Enable DAC clock
AnnaBridge 168:9672193075cf 74 __DAC_CLK_ENABLE();
AnnaBridge 168:9672193075cf 75
AnnaBridge 168:9672193075cf 76 // Configure DAC
AnnaBridge 168:9672193075cf 77 obj->handle.Instance = DAC;
AnnaBridge 176:447f873cad2f 78 obj->handle.State = HAL_DAC_STATE_RESET;
AnnaBridge 176:447f873cad2f 79
AnnaBridge 187:0387e8f68319 80 if (HAL_DAC_Init(&obj->handle) != HAL_OK) {
AnnaBridge 168:9672193075cf 81 error("HAL_DAC_Init failed");
AnnaBridge 168:9672193075cf 82 }
AnnaBridge 168:9672193075cf 83
AnnaBridge 168:9672193075cf 84 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
AnnaBridge 168:9672193075cf 85 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
AnnaBridge 168:9672193075cf 86
AnnaBridge 168:9672193075cf 87 if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
AnnaBridge 168:9672193075cf 88 error("Cannot configure DAC channel 2");
AnnaBridge 168:9672193075cf 89 }
AnnaBridge 168:9672193075cf 90
AnnaBridge 168:9672193075cf 91 if (obj->channel == DAC_CHANNEL_1) {
AnnaBridge 168:9672193075cf 92 channel1_used = 1;
AnnaBridge 168:9672193075cf 93 } else {
AnnaBridge 168:9672193075cf 94 channel2_used = 1;
AnnaBridge 168:9672193075cf 95 }
AnnaBridge 168:9672193075cf 96
AnnaBridge 168:9672193075cf 97 analogout_write_u16(obj, 0);
AnnaBridge 168:9672193075cf 98 }
AnnaBridge 168:9672193075cf 99
AnnaBridge 187:0387e8f68319 100 void analogout_free(dac_t *obj)
AnnaBridge 187:0387e8f68319 101 {
AnnaBridge 168:9672193075cf 102 // Reset DAC and disable clock
AnnaBridge 187:0387e8f68319 103 if (obj->channel == DAC_CHANNEL_1) {
AnnaBridge 187:0387e8f68319 104 channel1_used = 0;
AnnaBridge 187:0387e8f68319 105 }
AnnaBridge 168:9672193075cf 106 #if defined(DAC_CHANNEL_2)
AnnaBridge 187:0387e8f68319 107 if (obj->channel == DAC_CHANNEL_2) {
AnnaBridge 187:0387e8f68319 108 channel2_used = 0;
AnnaBridge 187:0387e8f68319 109 }
AnnaBridge 168:9672193075cf 110 #endif
AnnaBridge 168:9672193075cf 111 if ((channel1_used == 0) && (channel2_used == 0)) {
AnnaBridge 168:9672193075cf 112 __DAC_FORCE_RESET();
AnnaBridge 168:9672193075cf 113 __DAC_RELEASE_RESET();
AnnaBridge 168:9672193075cf 114 __DAC_CLK_DISABLE();
AnnaBridge 168:9672193075cf 115 }
AnnaBridge 168:9672193075cf 116
AnnaBridge 168:9672193075cf 117 // Configure GPIO
AnnaBridge 168:9672193075cf 118 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
AnnaBridge 168:9672193075cf 119 }
AnnaBridge 168:9672193075cf 120
AnnaBridge 168:9672193075cf 121 #endif // DEVICE_ANALOGOUT