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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/pwmout_api.c@56:99eb381a3269, 2013-12-12 (annotated)

Committer:
mbed_official
Date:
Thu Dec 12 10:45:05 2013 +0000
Revision:
56:99eb381a3269
Parent:
52:a51c77007319
Child:
58:3b55b7a41411
Synchronized with git revision bd51e4eb73a1706f1d5379ec5cebcbd6d978cb4f



Full URL: https://github.com/mbedmicro/mbed/commit/bd51e4eb73a1706f1d5379ec5cebcbd6d978cb4f/



[NUCLEO_F103RB] Add I2C master, code cleanup, ...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 52:a51c77007319 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 52:a51c77007319 3 *
mbed_official 52:a51c77007319 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 52:a51c77007319 5 * you may not use this file except in compliance with the License.
mbed_official 52:a51c77007319 6 * You may obtain a copy of the License at
mbed_official 52:a51c77007319 7 *
mbed_official 52:a51c77007319 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 52:a51c77007319 9 *
mbed_official 52:a51c77007319 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 52:a51c77007319 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 52:a51c77007319 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 52:a51c77007319 13 * See the License for the specific language governing permissions and
mbed_official 52:a51c77007319 14 * limitations under the License.
mbed_official 52:a51c77007319 15 */
mbed_official 52:a51c77007319 16 #include "pwmout_api.h"
mbed_official 52:a51c77007319 17
mbed_official 52:a51c77007319 18 #include "cmsis.h"
mbed_official 52:a51c77007319 19 #include "pinmap.h"
mbed_official 52:a51c77007319 20 #include "error.h"
mbed_official 52:a51c77007319 21
mbed_official 52:a51c77007319 22 // Only TIM2 and TIM3 can be used (TIM1 and TIM4 are used by the us_ticker)
mbed_official 52:a51c77007319 23 static const PinMap PinMap_PWM[] = {
mbed_official 52:a51c77007319 24 // TIM2
mbed_official 56:99eb381a3269 25 {PA_2, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM2_CH3 - ARDUINO D1 (extra)
mbed_official 56:99eb381a3269 26 {PA_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM2_CH4 - ARDUINO D0 (extra)
mbed_official 52:a51c77007319 27 // TIM2 remap
mbed_official 56:99eb381a3269 28 {PB_3, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2r_CH2 - ARDUINO D3
mbed_official 56:99eb381a3269 29 {PB_10, PWM_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 5)}, // TIM2r_CH3 - ARDUINO D6
mbed_official 52:a51c77007319 30 // TIM3
mbed_official 56:99eb381a3269 31 {PA_6, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH1 - ARDUINO D12 (extra)
mbed_official 56:99eb381a3269 32 {PA_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)}, // TIM3_CH2 - ARDUINO D11
mbed_official 52:a51c77007319 33 // TIM3 remap
mbed_official 56:99eb381a3269 34 {PB_4, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH1 - ARDUINO D5
mbed_official 56:99eb381a3269 35 {PC_7, PWM_3, STM_PIN_DATA(GPIO_Mode_AF_PP, 6)}, // TIM3r_CH2 - ARDUINO D9
mbed_official 52:a51c77007319 36 {NC, NC, 0}
mbed_official 52:a51c77007319 37 };
mbed_official 52:a51c77007319 38
mbed_official 52:a51c77007319 39 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 52:a51c77007319 40 // Get the peripheral name from the pin and assign it to the object
mbed_official 52:a51c77007319 41 obj->pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 52:a51c77007319 42
mbed_official 52:a51c77007319 43 if (obj->pwm == (PWMName)NC) {
mbed_official 52:a51c77007319 44 error("PWM pinout mapping failed");
mbed_official 52:a51c77007319 45 }
mbed_official 52:a51c77007319 46
mbed_official 52:a51c77007319 47 // Enable TIM clock
mbed_official 52:a51c77007319 48 if (obj->pwm == PWM_2) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
mbed_official 52:a51c77007319 49 if (obj->pwm == PWM_3) RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
mbed_official 52:a51c77007319 50
mbed_official 52:a51c77007319 51 // Configure GPIO
mbed_official 52:a51c77007319 52 pinmap_pinout(pin, PinMap_PWM);
mbed_official 52:a51c77007319 53
mbed_official 52:a51c77007319 54 obj->pin = pin;
mbed_official 52:a51c77007319 55 obj->period = 0;
mbed_official 52:a51c77007319 56 obj->pulse = 0;
mbed_official 52:a51c77007319 57
mbed_official 52:a51c77007319 58 pwmout_period_us(obj, 20000); // 20 ms per default
mbed_official 52:a51c77007319 59 }
mbed_official 52:a51c77007319 60
mbed_official 52:a51c77007319 61 void pwmout_free(pwmout_t* obj) {
mbed_official 52:a51c77007319 62 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 52:a51c77007319 63 TIM_DeInit(tim);
mbed_official 52:a51c77007319 64 }
mbed_official 52:a51c77007319 65
mbed_official 52:a51c77007319 66 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 52:a51c77007319 67 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 52:a51c77007319 68 TIM_OCInitTypeDef TIM_OCInitStructure;
mbed_official 52:a51c77007319 69
mbed_official 52:a51c77007319 70 if (value < 0.0) {
mbed_official 52:a51c77007319 71 value = 0.0;
mbed_official 52:a51c77007319 72 } else if (value > 1.0) {
mbed_official 52:a51c77007319 73 value = 1.0;
mbed_official 52:a51c77007319 74 }
mbed_official 52:a51c77007319 75
mbed_official 52:a51c77007319 76 //while(TIM_GetFlagStatus(tim, TIM_FLAG_Update) == RESET);
mbed_official 52:a51c77007319 77 //TIM_ClearFlag(tim, TIM_FLAG_Update);
mbed_official 52:a51c77007319 78
mbed_official 52:a51c77007319 79 obj->pulse = (uint32_t)((float)obj->period * value);
mbed_official 52:a51c77007319 80
mbed_official 52:a51c77007319 81 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
mbed_official 52:a51c77007319 82 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
mbed_official 52:a51c77007319 83 TIM_OCInitStructure.TIM_Pulse = obj->pulse;
mbed_official 52:a51c77007319 84 TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
mbed_official 52:a51c77007319 85
mbed_official 56:99eb381a3269 86 // TIM Channel 1
mbed_official 56:99eb381a3269 87 if ((obj->pin == PA_6) || (obj->pin == PB_4)) {
mbed_official 52:a51c77007319 88 TIM_OC1PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 52:a51c77007319 89 TIM_OC1Init(tim, &TIM_OCInitStructure);
mbed_official 52:a51c77007319 90 }
mbed_official 52:a51c77007319 91
mbed_official 56:99eb381a3269 92 // TIM Channel 2
mbed_official 56:99eb381a3269 93 if ((obj->pin == PA_7) || (obj->pin == PB_3) || (obj->pin == PC_7)) {
mbed_official 52:a51c77007319 94 TIM_OC2PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 52:a51c77007319 95 TIM_OC2Init(tim, &TIM_OCInitStructure);
mbed_official 52:a51c77007319 96 }
mbed_official 52:a51c77007319 97
mbed_official 56:99eb381a3269 98 // TIM Channel 3
mbed_official 56:99eb381a3269 99 if ((obj->pin == PA_2) || (obj->pin == PB_10)) {
mbed_official 52:a51c77007319 100 TIM_OC3PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 52:a51c77007319 101 TIM_OC3Init(tim, &TIM_OCInitStructure);
mbed_official 52:a51c77007319 102 }
mbed_official 52:a51c77007319 103
mbed_official 56:99eb381a3269 104 // TIM Channel 4
mbed_official 56:99eb381a3269 105 if (obj->pin == PA_3) {
mbed_official 52:a51c77007319 106 TIM_OC4PreloadConfig(tim, TIM_OCPreload_Enable);
mbed_official 52:a51c77007319 107 TIM_OC4Init(tim, &TIM_OCInitStructure);
mbed_official 52:a51c77007319 108 }
mbed_official 52:a51c77007319 109 }
mbed_official 52:a51c77007319 110
mbed_official 52:a51c77007319 111 float pwmout_read(pwmout_t* obj) {
mbed_official 52:a51c77007319 112 float value = 0;
mbed_official 52:a51c77007319 113 if (obj->period > 0) {
mbed_official 52:a51c77007319 114 value = (float)(obj->pulse) / (float)(obj->period);
mbed_official 52:a51c77007319 115 }
mbed_official 52:a51c77007319 116 return ((value > 1.0) ? (1.0) : (value));
mbed_official 52:a51c77007319 117 }
mbed_official 52:a51c77007319 118
mbed_official 52:a51c77007319 119 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 52:a51c77007319 120 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 52:a51c77007319 121 }
mbed_official 52:a51c77007319 122
mbed_official 52:a51c77007319 123 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 52:a51c77007319 124 pwmout_period_us(obj, ms * 1000);
mbed_official 52:a51c77007319 125 }
mbed_official 52:a51c77007319 126
mbed_official 52:a51c77007319 127 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 52:a51c77007319 128 TIM_TypeDef *tim = (TIM_TypeDef *)(obj->pwm);
mbed_official 52:a51c77007319 129 TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
mbed_official 52:a51c77007319 130 float dc = pwmout_read(obj);
mbed_official 52:a51c77007319 131
mbed_official 52:a51c77007319 132 TIM_Cmd(tim, DISABLE);
mbed_official 52:a51c77007319 133
mbed_official 52:a51c77007319 134 obj->period = us;
mbed_official 52:a51c77007319 135
mbed_official 52:a51c77007319 136 TIM_TimeBaseStructure.TIM_Period = obj->period - 1;
mbed_official 52:a51c77007319 137 TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
mbed_official 52:a51c77007319 138 TIM_TimeBaseStructure.TIM_ClockDivision = 0;
mbed_official 52:a51c77007319 139 TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
mbed_official 52:a51c77007319 140 TIM_TimeBaseInit(tim, &TIM_TimeBaseStructure);
mbed_official 52:a51c77007319 141
mbed_official 52:a51c77007319 142 // Set duty cycle again
mbed_official 52:a51c77007319 143 pwmout_write(obj, dc);
mbed_official 52:a51c77007319 144
mbed_official 52:a51c77007319 145 TIM_ARRPreloadConfig(tim, ENABLE);
mbed_official 52:a51c77007319 146 TIM_Cmd(tim, ENABLE);
mbed_official 52:a51c77007319 147 }
mbed_official 52:a51c77007319 148
mbed_official 52:a51c77007319 149 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 52:a51c77007319 150 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 52:a51c77007319 151 }
mbed_official 52:a51c77007319 152
mbed_official 52:a51c77007319 153 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 52:a51c77007319 154 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 52:a51c77007319 155 }
mbed_official 52:a51c77007319 156
mbed_official 52:a51c77007319 157 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 52:a51c77007319 158 float value = (float)us / (float)obj->period;
mbed_official 52:a51c77007319 159 pwmout_write(obj, value);
mbed_official 52:a51c77007319 160 }