1 /* mbed Microcontroller Library
2 * Copyright (c) 2014, STMicroelectronics
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. Neither the name of STMicroelectronics nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "analogout_api.h"
34 #include "mbed_error.h"
35 #include "stm32f4xx_hal.h"
36 #include "PeripheralPins.h"
38 #define RANGE_12BIT (0xFFF)
40 DAC_HandleTypeDef DacHandle;
41 static DAC_ChannelConfTypeDef sConfig;
43 void analogout_init(dac_t *obj, PinName pin)
46 HAL_StatusTypeDef status;
48 // Get the peripheral name (DAC_1, ...) from the pin and assign it to the object
49 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
50 // Get the functions (dac channel) from the pin and assign it to the object
51 uint32_t function = pinmap_function(pin, PinMap_DAC);
52 MBED_ASSERT(function != (uint32_t)NC);
53 // Save the channel for the write and read functions
54 obj->channel = STM_PIN_CHANNEL(function);
56 if (obj->dac == (DACName)NC) {
57 error("DAC pin mapping failed");
61 pinmap_pinout(pin, PinMap_DAC);
67 DacHandle.Instance = DAC;
69 status = HAL_DAC_Init(&DacHandle);
70 if ( status != HAL_OK ) {
71 error("HAL_DAC_Init failed");
74 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
75 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
77 if (obj->channel == 1) {
78 channel = DAC_CHANNEL_1;
80 channel = DAC_CHANNEL_2;
83 if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, channel) != HAL_OK) {
84 error("HAL_DAC_ConfigChannel failed");
87 if (HAL_DAC_Start(&DacHandle, channel) != HAL_OK) {
88 error("HAL_DAC_Start failed");
91 if (HAL_DAC_SetValue(&DacHandle, channel, DAC_ALIGN_12B_R, 0x000) != HAL_OK) {
92 error("HAL_DAC_SetValue failed");
97 void analogout_free(dac_t *obj)
101 static inline void dac_write(dac_t *obj, uint16_t value)
103 HAL_StatusTypeDef status = HAL_ERROR;
105 if (obj->channel == 1) {
106 status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, value);
107 } else if (obj->channel == 2) {
108 status = HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, value);
111 if ( status != HAL_OK ) {
112 error("DAC pin mapping failed");
116 static inline int dac_read(dac_t *obj)
118 if (obj->channel == 1) {
119 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
120 } else if (obj->channel == 2) {
121 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
123 return 0; /* Just silented warning */
126 void analogout_write(dac_t *obj, float value)
129 dac_write(obj, 0); // Min value
130 } else if (value > 1.0f) {
131 dac_write(obj, (uint16_t)RANGE_12BIT); // Max value
133 dac_write(obj, (uint16_t)(value * (float)RANGE_12BIT));
137 void analogout_write_u16(dac_t *obj, uint16_t value)
139 if (value > (uint16_t)RANGE_12BIT) {
140 value = (uint16_t)RANGE_12BIT; // Max value
143 dac_write(obj, value);
146 float analogout_read(dac_t *obj)
149 uint32_t value = dac_read(obj);
150 return (float)value * (1.0f / (float)RANGE_12BIT);
153 uint16_t analogout_read_u16(dac_t *obj)
155 return (uint16_t)dac_read(obj);
158 #endif // DEVICE_ANALOGOUT