Elijah Stanger-Jones / mbed-dev-f303

test

targets/TARGET_STM/TARGET_STM32L0/analogout_device.c@2:4364577b5ad8, 2020-11-09 (annotated)

Committer:
elijahsj
Date:
Mon Nov 09 00:33:19 2020 -0500
Revision:
2:4364577b5ad8
Parent:
1:8a094db1347f 
copied mbed library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elijahsj 1:8a094db1347f 1 /* mbed Microcontroller Library
elijahsj 1:8a094db1347f 2 * Copyright (c) 2015, STMicroelectronics
elijahsj 1:8a094db1347f 3 * All rights reserved.
elijahsj 1:8a094db1347f 4 *
elijahsj 1:8a094db1347f 5 * Redistribution and use in source and binary forms, with or without
elijahsj 1:8a094db1347f 6 * modification, are permitted provided that the following conditions are met:
elijahsj 1:8a094db1347f 7 *
elijahsj 1:8a094db1347f 8 * 1. Redistributions of source code must retain the above copyright notice,
elijahsj 1:8a094db1347f 9 * this list of conditions and the following disclaimer.
elijahsj 1:8a094db1347f 10 * 2. Redistributions in binary form must reproduce the above copyright notice,
elijahsj 1:8a094db1347f 11 * this list of conditions and the following disclaimer in the documentation
elijahsj 1:8a094db1347f 12 * and/or other materials provided with the distribution.
elijahsj 1:8a094db1347f 13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
elijahsj 1:8a094db1347f 14 * may be used to endorse or promote products derived from this software
elijahsj 1:8a094db1347f 15 * without specific prior written permission.
elijahsj 1:8a094db1347f 16 *
elijahsj 1:8a094db1347f 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
elijahsj 1:8a094db1347f 18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
elijahsj 1:8a094db1347f 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
elijahsj 1:8a094db1347f 20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
elijahsj 1:8a094db1347f 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
elijahsj 1:8a094db1347f 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
elijahsj 1:8a094db1347f 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
elijahsj 1:8a094db1347f 24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
elijahsj 1:8a094db1347f 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
elijahsj 1:8a094db1347f 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
elijahsj 1:8a094db1347f 27 */
elijahsj 1:8a094db1347f 28 #include "mbed_assert.h"
elijahsj 1:8a094db1347f 29 #include "analogout_api.h"
elijahsj 1:8a094db1347f 30
elijahsj 1:8a094db1347f 31 #if DEVICE_ANALOGOUT
elijahsj 1:8a094db1347f 32
elijahsj 1:8a094db1347f 33 #include "cmsis.h"
elijahsj 1:8a094db1347f 34 #include "pinmap.h"
elijahsj 1:8a094db1347f 35 #include "mbed_error.h"
elijahsj 1:8a094db1347f 36 #include "PeripheralPins.h"
elijahsj 1:8a094db1347f 37
elijahsj 1:8a094db1347f 38 // These variables are used for the "free" function
elijahsj 1:8a094db1347f 39 static int channel1_used = 0;
elijahsj 1:8a094db1347f 40 static int channel2_used = 0;
elijahsj 1:8a094db1347f 41
elijahsj 1:8a094db1347f 42 void analogout_init(dac_t *obj, PinName pin) {
elijahsj 1:8a094db1347f 43 DAC_ChannelConfTypeDef sConfig;
elijahsj 1:8a094db1347f 44
elijahsj 1:8a094db1347f 45 // Get the peripheral name from the pin and assign it to the object
elijahsj 1:8a094db1347f 46 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
elijahsj 1:8a094db1347f 47 MBED_ASSERT(obj->dac != (DACName)NC);
elijahsj 1:8a094db1347f 48
elijahsj 1:8a094db1347f 49 // Get the pin function and assign the used channel to the object
elijahsj 1:8a094db1347f 50 uint32_t function = pinmap_function(pin, PinMap_DAC);
elijahsj 1:8a094db1347f 51 MBED_ASSERT(function != (uint32_t)NC);
elijahsj 1:8a094db1347f 52 switch (STM_PIN_CHANNEL(function)) {
elijahsj 1:8a094db1347f 53 case 1:
elijahsj 1:8a094db1347f 54 obj->channel = DAC_CHANNEL_1;
elijahsj 1:8a094db1347f 55 break;
elijahsj 1:8a094db1347f 56 #if defined(DAC_CHANNEL_2)
elijahsj 1:8a094db1347f 57 case 2:
elijahsj 1:8a094db1347f 58 obj->channel = DAC_CHANNEL_2;
elijahsj 1:8a094db1347f 59 break;
elijahsj 1:8a094db1347f 60 #endif
elijahsj 1:8a094db1347f 61 default:
elijahsj 1:8a094db1347f 62 error("Unknown DAC channel");
elijahsj 1:8a094db1347f 63 break;
elijahsj 1:8a094db1347f 64 }
elijahsj 1:8a094db1347f 65
elijahsj 1:8a094db1347f 66 // Configure GPIO
elijahsj 1:8a094db1347f 67 pinmap_pinout(pin, PinMap_DAC);
elijahsj 1:8a094db1347f 68
elijahsj 1:8a094db1347f 69 // Save the pin for future use
elijahsj 1:8a094db1347f 70 obj->pin = pin;
elijahsj 1:8a094db1347f 71
elijahsj 1:8a094db1347f 72 // Enable DAC clock
elijahsj 1:8a094db1347f 73 __DAC_CLK_ENABLE();
elijahsj 1:8a094db1347f 74
elijahsj 1:8a094db1347f 75 // Configure DAC
elijahsj 1:8a094db1347f 76 obj->handle.Instance = DAC;
elijahsj 1:8a094db1347f 77 if (HAL_DAC_Init(&obj->handle) != HAL_OK ) {
elijahsj 1:8a094db1347f 78 error("HAL_DAC_Init failed");
elijahsj 1:8a094db1347f 79 }
elijahsj 1:8a094db1347f 80
elijahsj 1:8a094db1347f 81 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
elijahsj 1:8a094db1347f 82 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
elijahsj 1:8a094db1347f 83
elijahsj 1:8a094db1347f 84 if (HAL_DAC_ConfigChannel(&obj->handle, &sConfig, obj->channel) != HAL_OK) {
elijahsj 1:8a094db1347f 85 error("Cannot configure DAC channel 2");
elijahsj 1:8a094db1347f 86 }
elijahsj 1:8a094db1347f 87
elijahsj 1:8a094db1347f 88 if (obj->channel == DAC_CHANNEL_1) {
elijahsj 1:8a094db1347f 89 channel1_used = 1;
elijahsj 1:8a094db1347f 90 } else {
elijahsj 1:8a094db1347f 91 channel2_used = 1;
elijahsj 1:8a094db1347f 92 }
elijahsj 1:8a094db1347f 93
elijahsj 1:8a094db1347f 94 analogout_write_u16(obj, 0);
elijahsj 1:8a094db1347f 95 }
elijahsj 1:8a094db1347f 96
elijahsj 1:8a094db1347f 97 void analogout_free(dac_t *obj) {
elijahsj 1:8a094db1347f 98 // Reset DAC and disable clock
elijahsj 1:8a094db1347f 99 if (obj->channel == DAC_CHANNEL_1) channel1_used = 0;
elijahsj 1:8a094db1347f 100 #if defined(DAC_CHANNEL_2)
elijahsj 1:8a094db1347f 101 if (obj->channel == DAC_CHANNEL_2) channel2_used = 0;
elijahsj 1:8a094db1347f 102 #endif
elijahsj 1:8a094db1347f 103 if ((channel1_used == 0) && (channel2_used == 0)) {
elijahsj 1:8a094db1347f 104 __DAC_FORCE_RESET();
elijahsj 1:8a094db1347f 105 __DAC_RELEASE_RESET();
elijahsj 1:8a094db1347f 106 __DAC_CLK_DISABLE();
elijahsj 1:8a094db1347f 107 }
elijahsj 1:8a094db1347f 108
elijahsj 1:8a094db1347f 109 // Configure GPIO
elijahsj 1:8a094db1347f 110 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
elijahsj 1:8a094db1347f 111 }
elijahsj 1:8a094db1347f 112
elijahsj 1:8a094db1347f 113 #endif // DEVICE_ANALOGOUT