Cortney Padua / mbed-dev

fixed drive strength

Dependents:   capstone_i2c

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32F0/analogout_api.c@163:1d4c9d0af1e9, 2017-04-11 (annotated)

Committer:
cpadua
Date:
Tue Apr 11 20:39:24 2017 +0000
Revision:
163:1d4c9d0af1e9
Parent:
149:156823d33999 
fixed i2c-api.c

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 void analogout_init(dac_t *obj, PinName pin) {
<> 144:ef7eb2e8f9f7 44 DAC_ChannelConfTypeDef sConfig;
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 // Get the peripheral name from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 47 obj->dac = (DACName)pinmap_peripheral(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 48 MBED_ASSERT(obj->dac != (DACName)NC);
<> 144:ef7eb2e8f9f7 49
<> 144:ef7eb2e8f9f7 50 // Get the pin function and assign the used channel to the object
<> 144:ef7eb2e8f9f7 51 uint32_t function = pinmap_function(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 52 MBED_ASSERT(function != (uint32_t)NC);
<> 144:ef7eb2e8f9f7 53 obj->channel = STM_PIN_CHANNEL(function);
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 // Configure GPIO
<> 144:ef7eb2e8f9f7 56 pinmap_pinout(pin, PinMap_DAC);
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 // Save the pin for future use
<> 144:ef7eb2e8f9f7 59 obj->pin = pin;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 // Enable DAC clock
<> 144:ef7eb2e8f9f7 62 __DAC1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 // Configure DAC
<> 144:ef7eb2e8f9f7 65 DacHandle.Instance = (DAC_TypeDef *)(obj->dac);
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 sConfig.DAC_Trigger = DAC_TRIGGER_NONE;
<> 144:ef7eb2e8f9f7 68 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 if (pin == PA_4) {
<> 144:ef7eb2e8f9f7 71 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 72 } else { // PA_5
<> 144:ef7eb2e8f9f7 73 HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 74 }
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 analogout_write_u16(obj, 0);
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 void analogout_free(dac_t *obj) {
<> 144:ef7eb2e8f9f7 80 // Reset DAC and disable clock
<> 144:ef7eb2e8f9f7 81 __DAC1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 82 __DAC1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 83 __DAC1_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 // Configure GPIO
<> 144:ef7eb2e8f9f7 86 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 87 }
<> 144:ef7eb2e8f9f7 88
<> 144:ef7eb2e8f9f7 89 static inline void dac_write(dac_t *obj, int value) {
<> 144:ef7eb2e8f9f7 90 if (obj->channel == 1) {
<> 144:ef7eb2e8f9f7 91 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_1, DAC_ALIGN_12B_R, (value & DAC_RANGE));
<> 144:ef7eb2e8f9f7 92 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 93 }
<> 144:ef7eb2e8f9f7 94 #if defined(DAC_CHANNEL_2)
<> 144:ef7eb2e8f9f7 95 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 96 HAL_DAC_SetValue(&DacHandle, DAC_CHANNEL_2, DAC_ALIGN_12B_R, (value & DAC_RANGE));
<> 144:ef7eb2e8f9f7 97 HAL_DAC_Start(&DacHandle, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 98 }
<> 144:ef7eb2e8f9f7 99 #endif
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 static inline int dac_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 103 if (obj->channel == 1) {
<> 144:ef7eb2e8f9f7 104 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_1);
<> 144:ef7eb2e8f9f7 105 }
<> 144:ef7eb2e8f9f7 106 #if defined(DAC_CHANNEL_2)
<> 144:ef7eb2e8f9f7 107 if (obj->channel == 2) {
<> 144:ef7eb2e8f9f7 108 return (int)HAL_DAC_GetValue(&DacHandle, DAC_CHANNEL_2);
<> 144:ef7eb2e8f9f7 109 }
<> 144:ef7eb2e8f9f7 110 #endif
<> 144:ef7eb2e8f9f7 111 return 0;
<> 144:ef7eb2e8f9f7 112 }
<> 144:ef7eb2e8f9f7 113
<> 144:ef7eb2e8f9f7 114 void analogout_write(dac_t *obj, float value) {
<> 144:ef7eb2e8f9f7 115 if (value < 0.0f) {
<> 144:ef7eb2e8f9f7 116 dac_write(obj, 0); // Min value
<> 144:ef7eb2e8f9f7 117 } else if (value > 1.0f) {
<> 144:ef7eb2e8f9f7 118 dac_write(obj, (int)DAC_RANGE); // Max value
<> 144:ef7eb2e8f9f7 119 } else {
<> 144:ef7eb2e8f9f7 120 dac_write(obj, (int)(value * (float)DAC_RANGE));
<> 144:ef7eb2e8f9f7 121 }
<> 144:ef7eb2e8f9f7 122 }
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 void analogout_write_u16(dac_t *obj, uint16_t value) {
<> 144:ef7eb2e8f9f7 125 dac_write(obj, value >> (16 - DAC_NB_BITS));
<> 144:ef7eb2e8f9f7 126 }
<> 144:ef7eb2e8f9f7 127
<> 144:ef7eb2e8f9f7 128 float analogout_read(dac_t *obj) {
<> 144:ef7eb2e8f9f7 129 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 130 return (float)value * (1.0f / (float)DAC_RANGE);
<> 144:ef7eb2e8f9f7 131 }
<> 144:ef7eb2e8f9f7 132
<> 144:ef7eb2e8f9f7 133 uint16_t analogout_read_u16(dac_t *obj) {
<> 144:ef7eb2e8f9f7 134 uint32_t value = dac_read(obj);
<> 144:ef7eb2e8f9f7 135 return (value << 4) | ((value >> 8) & 0x000F); // Conversion from 12 to 16 bits
<> 144:ef7eb2e8f9f7 136 }
<> 144:ef7eb2e8f9f7 137
<> 144:ef7eb2e8f9f7 138 #endif // DEVICE_ANALOGOUT