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Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_STM/TARGET_STM32L1/pwmout_api.c@1:f30bdcd2b33b, 2017-02-27 (annotated)

Committer:
jacobjohnson
Date:
Mon Feb 27 17:45:05 2017 +0000
Revision:
1:f30bdcd2b33b
Parent:
0:098463de4c5d 
changed the inputscale from 1 to 7 in analogin_api.c.  This will need to be changed later, and accessed from the main level, but for now this allows the  adc to read a value from 0 to 3.7V, instead of just up to 1V.;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 *******************************************************************************
group-onsemi 0:098463de4c5d 3 * Copyright (c) 2014, STMicroelectronics
group-onsemi 0:098463de4c5d 4 * All rights reserved.
group-onsemi 0:098463de4c5d 5 *
group-onsemi 0:098463de4c5d 6 * Redistribution and use in source and binary forms, with or without
group-onsemi 0:098463de4c5d 7 * modification, are permitted provided that the following conditions are met:
group-onsemi 0:098463de4c5d 8 *
group-onsemi 0:098463de4c5d 9 * 1. Redistributions of source code must retain the above copyright notice,
group-onsemi 0:098463de4c5d 10 * this list of conditions and the following disclaimer.
group-onsemi 0:098463de4c5d 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
group-onsemi 0:098463de4c5d 12 * this list of conditions and the following disclaimer in the documentation
group-onsemi 0:098463de4c5d 13 * and/or other materials provided with the distribution.
group-onsemi 0:098463de4c5d 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
group-onsemi 0:098463de4c5d 15 * may be used to endorse or promote products derived from this software
group-onsemi 0:098463de4c5d 16 * without specific prior written permission.
group-onsemi 0:098463de4c5d 17 *
group-onsemi 0:098463de4c5d 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
group-onsemi 0:098463de4c5d 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
group-onsemi 0:098463de4c5d 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
group-onsemi 0:098463de4c5d 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
group-onsemi 0:098463de4c5d 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
group-onsemi 0:098463de4c5d 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
group-onsemi 0:098463de4c5d 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
group-onsemi 0:098463de4c5d 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
group-onsemi 0:098463de4c5d 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
group-onsemi 0:098463de4c5d 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
group-onsemi 0:098463de4c5d 28 *******************************************************************************
group-onsemi 0:098463de4c5d 29 */
group-onsemi 0:098463de4c5d 30 #include "pwmout_api.h"
group-onsemi 0:098463de4c5d 31
group-onsemi 0:098463de4c5d 32 #if DEVICE_PWMOUT
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #include "cmsis.h"
group-onsemi 0:098463de4c5d 35 #include "pinmap.h"
group-onsemi 0:098463de4c5d 36 #include "mbed_error.h"
group-onsemi 0:098463de4c5d 37 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 static TIM_HandleTypeDef TimHandle;
group-onsemi 0:098463de4c5d 40
group-onsemi 0:098463de4c5d 41 void pwmout_init(pwmout_t* obj, PinName pin)
group-onsemi 0:098463de4c5d 42 {
group-onsemi 0:098463de4c5d 43 // Get the peripheral name from the pin and assign it to the object
group-onsemi 0:098463de4c5d 44 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 45
group-onsemi 0:098463de4c5d 46 if (obj->pwm == (PWMName)NC) {
group-onsemi 0:098463de4c5d 47 error("PWM error: pinout mapping failed.");
group-onsemi 0:098463de4c5d 48 }
group-onsemi 0:098463de4c5d 49
group-onsemi 0:098463de4c5d 50 // Enable TIM clock
group-onsemi 0:098463de4c5d 51 if (obj->pwm == PWM_2) __TIM2_CLK_ENABLE();
group-onsemi 0:098463de4c5d 52 if (obj->pwm == PWM_3) __TIM3_CLK_ENABLE();
group-onsemi 0:098463de4c5d 53 if (obj->pwm == PWM_4) __TIM4_CLK_ENABLE();
group-onsemi 0:098463de4c5d 54 if (obj->pwm == PWM_5) __TIM5_CLK_ENABLE();
group-onsemi 0:098463de4c5d 55 if (obj->pwm == PWM_9) __TIM9_CLK_ENABLE();
group-onsemi 0:098463de4c5d 56 if (obj->pwm == PWM_10) __TIM10_CLK_ENABLE();
group-onsemi 0:098463de4c5d 57 if (obj->pwm == PWM_11) __TIM11_CLK_ENABLE();
group-onsemi 0:098463de4c5d 58
group-onsemi 0:098463de4c5d 59 // Configure GPIO
group-onsemi 0:098463de4c5d 60 pinmap_pinout(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 61
group-onsemi 0:098463de4c5d 62 obj->pin = pin;
group-onsemi 0:098463de4c5d 63 obj->period = 0;
group-onsemi 0:098463de4c5d 64 obj->pulse = 0;
group-onsemi 0:098463de4c5d 65 obj->prescaler = 1;
group-onsemi 0:098463de4c5d 66
group-onsemi 0:098463de4c5d 67 pwmout_period_us(obj, 20000); // 20 ms per default
group-onsemi 0:098463de4c5d 68 }
group-onsemi 0:098463de4c5d 69
group-onsemi 0:098463de4c5d 70 void pwmout_free(pwmout_t* obj)
group-onsemi 0:098463de4c5d 71 {
group-onsemi 0:098463de4c5d 72 // Configure GPIO
group-onsemi 0:098463de4c5d 73 pin_function(obj->pin, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
group-onsemi 0:098463de4c5d 74 }
group-onsemi 0:098463de4c5d 75
group-onsemi 0:098463de4c5d 76 void pwmout_write(pwmout_t* obj, float value)
group-onsemi 0:098463de4c5d 77 {
group-onsemi 0:098463de4c5d 78 TIM_OC_InitTypeDef sConfig;
group-onsemi 0:098463de4c5d 79 int channel = 0;
group-onsemi 0:098463de4c5d 80
group-onsemi 0:098463de4c5d 81 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
group-onsemi 0:098463de4c5d 82
group-onsemi 0:098463de4c5d 83 if (value < (float)0.0) {
group-onsemi 0:098463de4c5d 84 value = 0.0;
group-onsemi 0:098463de4c5d 85 } else if (value > (float)1.0) {
group-onsemi 0:098463de4c5d 86 value = 1.0;
group-onsemi 0:098463de4c5d 87 }
group-onsemi 0:098463de4c5d 88
group-onsemi 0:098463de4c5d 89 obj->pulse = (uint32_t)((float)obj->period * value);
group-onsemi 0:098463de4c5d 90
group-onsemi 0:098463de4c5d 91 // Configure channels
group-onsemi 0:098463de4c5d 92 sConfig.OCMode = TIM_OCMODE_PWM1;
group-onsemi 0:098463de4c5d 93 sConfig.Pulse = obj->pulse / obj->prescaler;
group-onsemi 0:098463de4c5d 94 sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
group-onsemi 0:098463de4c5d 95 sConfig.OCFastMode = TIM_OCFAST_ENABLE;
group-onsemi 0:098463de4c5d 96
group-onsemi 0:098463de4c5d 97 switch (obj->pin) {
group-onsemi 0:098463de4c5d 98 // Channels 1
group-onsemi 0:098463de4c5d 99 case PA_6:
group-onsemi 0:098463de4c5d 100 case PB_4:
group-onsemi 0:098463de4c5d 101 case PB_6:
group-onsemi 0:098463de4c5d 102 case PB_12:
group-onsemi 0:098463de4c5d 103 case PB_13:
group-onsemi 0:098463de4c5d 104 case PB_15:
group-onsemi 0:098463de4c5d 105 case PC_6:
group-onsemi 0:098463de4c5d 106 channel = TIM_CHANNEL_1;
group-onsemi 0:098463de4c5d 107 break;
group-onsemi 0:098463de4c5d 108 // Channels 2
group-onsemi 0:098463de4c5d 109 case PA_1:
group-onsemi 0:098463de4c5d 110 case PA_7:
group-onsemi 0:098463de4c5d 111 case PB_3:
group-onsemi 0:098463de4c5d 112 case PB_5:
group-onsemi 0:098463de4c5d 113 case PB_7:
group-onsemi 0:098463de4c5d 114 case PB_14:
group-onsemi 0:098463de4c5d 115 case PC_7:
group-onsemi 0:098463de4c5d 116 channel = TIM_CHANNEL_2;
group-onsemi 0:098463de4c5d 117 break;
group-onsemi 0:098463de4c5d 118 // Channels 3
group-onsemi 0:098463de4c5d 119 case PA_2:
group-onsemi 0:098463de4c5d 120 case PB_0:
group-onsemi 0:098463de4c5d 121 case PB_8:
group-onsemi 0:098463de4c5d 122 case PB_10:
group-onsemi 0:098463de4c5d 123 case PC_8:
group-onsemi 0:098463de4c5d 124 channel = TIM_CHANNEL_3;
group-onsemi 0:098463de4c5d 125 break;
group-onsemi 0:098463de4c5d 126 // Channels 4
group-onsemi 0:098463de4c5d 127 case PA_3:
group-onsemi 0:098463de4c5d 128 case PB_1:
group-onsemi 0:098463de4c5d 129 case PB_9:
group-onsemi 0:098463de4c5d 130 case PB_11:
group-onsemi 0:098463de4c5d 131 case PC_9:
group-onsemi 0:098463de4c5d 132 channel = TIM_CHANNEL_4;
group-onsemi 0:098463de4c5d 133 break;
group-onsemi 0:098463de4c5d 134 default:
group-onsemi 0:098463de4c5d 135 return;
group-onsemi 0:098463de4c5d 136 }
group-onsemi 0:098463de4c5d 137
group-onsemi 0:098463de4c5d 138 HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, channel);
group-onsemi 0:098463de4c5d 139 HAL_TIM_PWM_Start(&TimHandle, channel);
group-onsemi 0:098463de4c5d 140 }
group-onsemi 0:098463de4c5d 141
group-onsemi 0:098463de4c5d 142 float pwmout_read(pwmout_t* obj)
group-onsemi 0:098463de4c5d 143 {
group-onsemi 0:098463de4c5d 144 float value = 0;
group-onsemi 0:098463de4c5d 145 if (obj->period > 0) {
group-onsemi 0:098463de4c5d 146 value = (float)(obj->pulse) / (float)(obj->period);
group-onsemi 0:098463de4c5d 147 }
group-onsemi 0:098463de4c5d 148 return ((value > (float)1.0) ? (float)(1.0) : (value));
group-onsemi 0:098463de4c5d 149 }
group-onsemi 0:098463de4c5d 150
group-onsemi 0:098463de4c5d 151 void pwmout_period(pwmout_t* obj, float seconds)
group-onsemi 0:098463de4c5d 152 {
group-onsemi 0:098463de4c5d 153 pwmout_period_us(obj, seconds * 1000000.0f);
group-onsemi 0:098463de4c5d 154 }
group-onsemi 0:098463de4c5d 155
group-onsemi 0:098463de4c5d 156 void pwmout_period_ms(pwmout_t* obj, int ms)
group-onsemi 0:098463de4c5d 157 {
group-onsemi 0:098463de4c5d 158 pwmout_period_us(obj, ms * 1000);
group-onsemi 0:098463de4c5d 159 }
group-onsemi 0:098463de4c5d 160
group-onsemi 0:098463de4c5d 161 void pwmout_period_us(pwmout_t* obj, int us)
group-onsemi 0:098463de4c5d 162 {
group-onsemi 0:098463de4c5d 163 TimHandle.Instance = (TIM_TypeDef *)(obj->pwm);
group-onsemi 0:098463de4c5d 164
group-onsemi 0:098463de4c5d 165 float dc = pwmout_read(obj);
group-onsemi 0:098463de4c5d 166
group-onsemi 0:098463de4c5d 167 __HAL_TIM_DISABLE(&TimHandle);
group-onsemi 0:098463de4c5d 168
group-onsemi 0:098463de4c5d 169 /* To make it simple, we use to possible prescaler values which lead to:
group-onsemi 0:098463de4c5d 170 * pwm unit = 1us, period/pulse can be from 1us to 65535us
group-onsemi 0:098463de4c5d 171 * or
group-onsemi 0:098463de4c5d 172 * pwm unit = 500us, period/pulse can be from 500us to ~32.76sec
group-onsemi 0:098463de4c5d 173 * Be careful that all the channels of a PWM shares the same prescaler
group-onsemi 0:098463de4c5d 174 */
group-onsemi 0:098463de4c5d 175 if (us > 0xFFFF) {
group-onsemi 0:098463de4c5d 176 obj->prescaler = 500;
group-onsemi 0:098463de4c5d 177 } else {
group-onsemi 0:098463de4c5d 178 obj->prescaler = 1;
group-onsemi 0:098463de4c5d 179 }
group-onsemi 0:098463de4c5d 180 TimHandle.Init.Prescaler = ((SystemCoreClock / 1000000) * obj->prescaler) - 1;
group-onsemi 0:098463de4c5d 181
group-onsemi 0:098463de4c5d 182 if (TimHandle.Init.Prescaler > 0xFFFF)
group-onsemi 0:098463de4c5d 183 error("PWM: out of range prescaler");
group-onsemi 0:098463de4c5d 184
group-onsemi 0:098463de4c5d 185 TimHandle.Init.Period = (us - 1) / obj->prescaler;
group-onsemi 0:098463de4c5d 186 if (TimHandle.Init.Period > 0xFFFF)
group-onsemi 0:098463de4c5d 187 error("PWM: out of range period");
group-onsemi 0:098463de4c5d 188
group-onsemi 0:098463de4c5d 189 TimHandle.Init.ClockDivision = 0;
group-onsemi 0:098463de4c5d 190 TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
group-onsemi 0:098463de4c5d 191
group-onsemi 0:098463de4c5d 192 if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK) {
group-onsemi 0:098463de4c5d 193 error("Cannot initialize PWM");
group-onsemi 0:098463de4c5d 194 }
group-onsemi 0:098463de4c5d 195
group-onsemi 0:098463de4c5d 196 // Save for future use
group-onsemi 0:098463de4c5d 197 obj->period = us;
group-onsemi 0:098463de4c5d 198
group-onsemi 0:098463de4c5d 199 // Set duty cycle again
group-onsemi 0:098463de4c5d 200 pwmout_write(obj, dc);
group-onsemi 0:098463de4c5d 201
group-onsemi 0:098463de4c5d 202 __HAL_TIM_ENABLE(&TimHandle);
group-onsemi 0:098463de4c5d 203 }
group-onsemi 0:098463de4c5d 204
group-onsemi 0:098463de4c5d 205 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
group-onsemi 0:098463de4c5d 206 {
group-onsemi 0:098463de4c5d 207 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
group-onsemi 0:098463de4c5d 208 }
group-onsemi 0:098463de4c5d 209
group-onsemi 0:098463de4c5d 210 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
group-onsemi 0:098463de4c5d 211 {
group-onsemi 0:098463de4c5d 212 pwmout_pulsewidth_us(obj, ms * 1000);
group-onsemi 0:098463de4c5d 213 }
group-onsemi 0:098463de4c5d 214
group-onsemi 0:098463de4c5d 215 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
group-onsemi 0:098463de4c5d 216 {
group-onsemi 0:098463de4c5d 217 float value = (float)us / (float)obj->period;
group-onsemi 0:098463de4c5d 218 pwmout_write(obj, value);
group-onsemi 0:098463de4c5d 219 }
group-onsemi 0:098463de4c5d 220
group-onsemi 0:098463de4c5d 221 #endif