John Karatka / mbed

mbed

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L0/analogout_device.c@182:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
182:57724642e740
Parent:
177:447f873cad2f 
mbed-dev library. Release version 159.

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 168:9672193075cf 42 void analogout_init(dac_t *obj, PinName pin) {
AnnaBridge 177:447f873cad2f 43 DAC_ChannelConfTypeDef sConfig = {0};
AnnaBridge 168:9672193075cf 44
AnnaBridge 168:9672193075cf 45 // Get the peripheral name from the pin and assign it to the object
AnnaBridge 168:9672193075cf 46 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
AnnaBridge 168:9672193075cf 47 MBED_ASSERT(obj->dac != (DACName)NC);
AnnaBridge 168:9672193075cf 48
AnnaBridge 168:9672193075cf 49 // Get the pin function and assign the used channel to the object
AnnaBridge 168:9672193075cf 50 uint32_t function = pinmap_function(pin, PinMap_DAC);
AnnaBridge 168:9672193075cf 51 MBED_ASSERT(function != (uint32_t)NC);
AnnaBridge 168:9672193075cf 52 switch (STM_PIN_CHANNEL(function)) {
AnnaBridge 168:9672193075cf 53 case 1:
AnnaBridge 168:9672193075cf 54 obj->channel = DAC_CHANNEL_1;
AnnaBridge 168:9672193075cf 55 break;
AnnaBridge 168:9672193075cf 56 #if defined(DAC_CHANNEL_2)
AnnaBridge 168:9672193075cf 57 case 2:
AnnaBridge 168:9672193075cf 58 obj->channel = DAC_CHANNEL_2;
AnnaBridge 168:9672193075cf 59 break;
AnnaBridge 168:9672193075cf 60 #endif
AnnaBridge 168:9672193075cf 61 default:
AnnaBridge 168:9672193075cf 62 error("Unknown DAC channel");
AnnaBridge 168:9672193075cf 63 break;
AnnaBridge 168:9672193075cf 64 }
AnnaBridge 168:9672193075cf 65
AnnaBridge 168:9672193075cf 66 // Configure GPIO
AnnaBridge 168:9672193075cf 67 pinmap_pinout(pin, PinMap_DAC);
AnnaBridge 168:9672193075cf 68
AnnaBridge 168:9672193075cf 69 // Save the pin for future use
AnnaBridge 168:9672193075cf 70 obj->pin = pin;
AnnaBridge 168:9672193075cf 71
AnnaBridge 168:9672193075cf 72 // Enable DAC clock
AnnaBridge 168:9672193075cf 73 __DAC_CLK_ENABLE();
AnnaBridge 168:9672193075cf 74
AnnaBridge 168:9672193075cf 75 // Configure DAC
AnnaBridge 168:9672193075cf 76 obj->handle.Instance = DAC;
AnnaBridge 177:447f873cad2f 77 obj->handle.State = HAL_DAC_STATE_RESET;
AnnaBridge 177:447f873cad2f 78
AnnaBridge 168:9672193075cf 79 if (HAL_DAC_Init(&obj->handle) != HAL_OK ) {
AnnaBridge 168:9672193075cf 80 error("HAL_DAC_Init failed");
AnnaBridge 168:9672193075cf 81 }
AnnaBridge 168:9672193075cf 82
AnnaBridge 168:9672193075cf 83 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
AnnaBridge 168:9672193075cf 84 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
AnnaBridge 168:9672193075cf 85
AnnaBridge 168:9672193075cf 86 if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
AnnaBridge 168:9672193075cf 87 error("Cannot configure DAC channel 2");
AnnaBridge 168:9672193075cf 88 }
AnnaBridge 168:9672193075cf 89
AnnaBridge 168:9672193075cf 90 if (obj->channel == DAC_CHANNEL_1) {
AnnaBridge 168:9672193075cf 91 channel1_used = 1;
AnnaBridge 168:9672193075cf 92 } else {
AnnaBridge 168:9672193075cf 93 channel2_used = 1;
AnnaBridge 168:9672193075cf 94 }
AnnaBridge 168:9672193075cf 95
AnnaBridge 168:9672193075cf 96 analogout_write_u16(obj, 0);
AnnaBridge 168:9672193075cf 97 }
AnnaBridge 168:9672193075cf 98
AnnaBridge 168:9672193075cf 99 void analogout_free(dac_t *obj) {
AnnaBridge 168:9672193075cf 100 // Reset DAC and disable clock
AnnaBridge 168:9672193075cf 101 if (obj->channel == DAC_CHANNEL_1) channel1_used = 0;
AnnaBridge 168:9672193075cf 102 #if defined(DAC_CHANNEL_2)
AnnaBridge 168:9672193075cf 103 if (obj->channel == DAC_CHANNEL_2) channel2_used = 0;
AnnaBridge 168:9672193075cf 104 #endif
AnnaBridge 168:9672193075cf 105 if ((channel1_used == 0) && (channel2_used == 0)) {
AnnaBridge 168:9672193075cf 106 __DAC_FORCE_RESET();
AnnaBridge 168:9672193075cf 107 __DAC_RELEASE_RESET();
AnnaBridge 168:9672193075cf 108 __DAC_CLK_DISABLE();
AnnaBridge 168:9672193075cf 109 }
AnnaBridge 168:9672193075cf 110
AnnaBridge 168:9672193075cf 111 // Configure GPIO
AnnaBridge 168:9672193075cf 112 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
AnnaBridge 168:9672193075cf 113 }
AnnaBridge 168:9672193075cf 114
AnnaBridge 168:9672193075cf 115 #endif // DEVICE_ANALOGOUT