Johannes Stratmann / mbed-dev

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targets/hal/TARGET_WIZNET/TARGET_W7500x/pwmout_api.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2015 WIZnet Co.,Ltd. All rights reserved.
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of ARM Limited nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "pwmout_api.h"
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 #if DEVICE_PWMOUT
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 35 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 36 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 37 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 38 #include "W7500x_pwm.h"
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 static PWM_TimerModeInitTypeDef TimerModeStructure;
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 void pwmout_init(pwmout_t* obj, PinName pin)
<> 144:ef7eb2e8f9f7 43 {
<> 144:ef7eb2e8f9f7 44 // Get the peripheral name from the pin and assign it to the object
<> 144:ef7eb2e8f9f7 45 obj->PWM_CHx = (PWM_CHn_TypeDef *)pinmap_peripheral(pin, PinMap_PWM);
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 if (obj->PWM_CHx == (PWM_CHn_TypeDef *)NC) {
<> 144:ef7eb2e8f9f7 48 error("PWM error: pinout mapping failed.");
<> 144:ef7eb2e8f9f7 49 }
<> 144:ef7eb2e8f9f7 50
<> 144:ef7eb2e8f9f7 51 // Configure GPIO
<> 144:ef7eb2e8f9f7 52 pinmap_pinout(pin, PinMap_PWM);
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 GetSystemClock();
<> 144:ef7eb2e8f9f7 55
<> 144:ef7eb2e8f9f7 56 obj->pin = pin;
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 pwmout_period_us(obj, 20000); // 20 ms per default
<> 144:ef7eb2e8f9f7 59 }
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 void pwmout_free(pwmout_t* obj)
<> 144:ef7eb2e8f9f7 62 {
<> 144:ef7eb2e8f9f7 63 // Configure GPIO
<> 144:ef7eb2e8f9f7 64 pin_function(obj->pin, WIZ_PIN_DATA(WIZ_MODE_AF, WIZ_GPIO_NOPULL, Px_AFSR_AF0));
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 void pwmout_write(pwmout_t* obj, float value)
<> 144:ef7eb2e8f9f7 68 {
<> 144:ef7eb2e8f9f7 69 if (value < (float)0.0) {
<> 144:ef7eb2e8f9f7 70 value = 0.0;
<> 144:ef7eb2e8f9f7 71 } else if (value > (float)1.0) {
<> 144:ef7eb2e8f9f7 72 value = 1.0;
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75 obj->pulse = (uint32_t)((float)obj->period * value);
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 PWM_CHn_Stop(obj->PWM_CHx);
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 TimerModeStructure.PWM_CHn_PR = obj->PrescalerValue - 1;
<> 144:ef7eb2e8f9f7 80 TimerModeStructure.PWM_CHn_MR = obj->pulse;
<> 144:ef7eb2e8f9f7 81 TimerModeStructure.PWM_CHn_LR = obj->period;
<> 144:ef7eb2e8f9f7 82 TimerModeStructure.PWM_CHn_UDMR = PWM_CHn_UDMR_UpCount;
<> 144:ef7eb2e8f9f7 83 TimerModeStructure.PWM_CHn_PDMR = PWM_CHn_PDMR_Periodic;
<> 144:ef7eb2e8f9f7 84
<> 144:ef7eb2e8f9f7 85 PWM_TimerModeInit(obj->PWM_CHx, &TimerModeStructure);
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 PWM_CHn_Start(obj->PWM_CHx);
<> 144:ef7eb2e8f9f7 88 }
<> 144:ef7eb2e8f9f7 89
<> 144:ef7eb2e8f9f7 90 float pwmout_read(pwmout_t* obj)
<> 144:ef7eb2e8f9f7 91 {
<> 144:ef7eb2e8f9f7 92 float value = 0;
<> 144:ef7eb2e8f9f7 93 if (obj->period > 0) {
<> 144:ef7eb2e8f9f7 94 value = (float)(obj->pulse) / (float)(obj->period);
<> 144:ef7eb2e8f9f7 95 }
<> 144:ef7eb2e8f9f7 96 return ((value > (float)1.0) ? (float)(1.0) : (value));
<> 144:ef7eb2e8f9f7 97 }
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 void pwmout_period(pwmout_t* obj, float seconds)
<> 144:ef7eb2e8f9f7 100 {
<> 144:ef7eb2e8f9f7 101 pwmout_period_us(obj, seconds * 1000000.0f);
<> 144:ef7eb2e8f9f7 102 }
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 void pwmout_period_ms(pwmout_t* obj, int ms)
<> 144:ef7eb2e8f9f7 105 {
<> 144:ef7eb2e8f9f7 106 pwmout_period_us(obj, ms * 1000);
<> 144:ef7eb2e8f9f7 107 }
<> 144:ef7eb2e8f9f7 108
<> 144:ef7eb2e8f9f7 109 void pwmout_period_us(pwmout_t* obj, int us)
<> 144:ef7eb2e8f9f7 110 {
<> 144:ef7eb2e8f9f7 111 PWM_CHn_Stop(obj->PWM_CHx);
<> 144:ef7eb2e8f9f7 112 // Update the SystemCoreClock variable
<> 144:ef7eb2e8f9f7 113 SystemCoreClockUpdate();
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115 obj->period = (us * 2) - 1;
<> 144:ef7eb2e8f9f7 116 obj->pulse = us / 2;
<> 144:ef7eb2e8f9f7 117
<> 144:ef7eb2e8f9f7 118 obj->PrescalerValue = (SystemCoreClock / 1000000) / 2;
<> 144:ef7eb2e8f9f7 119 TimerModeStructure.PWM_CHn_PR = obj->PrescalerValue - 1;
<> 144:ef7eb2e8f9f7 120 TimerModeStructure.PWM_CHn_MR = obj->pulse;
<> 144:ef7eb2e8f9f7 121 TimerModeStructure.PWM_CHn_LR = obj->period;
<> 144:ef7eb2e8f9f7 122 TimerModeStructure.PWM_CHn_UDMR = PWM_CHn_UDMR_UpCount;
<> 144:ef7eb2e8f9f7 123 TimerModeStructure.PWM_CHn_PDMR = PWM_CHn_PDMR_Periodic;
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 PWM_TimerModeInit(obj->PWM_CHx, &TimerModeStructure);
<> 144:ef7eb2e8f9f7 126 PWM_CtrlPWMOutputEnable(obj->PWM_CHx);
<> 144:ef7eb2e8f9f7 127 }
<> 144:ef7eb2e8f9f7 128
<> 144:ef7eb2e8f9f7 129 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
<> 144:ef7eb2e8f9f7 130 {
<> 144:ef7eb2e8f9f7 131 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
<> 144:ef7eb2e8f9f7 132 }
<> 144:ef7eb2e8f9f7 133
<> 144:ef7eb2e8f9f7 134 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
<> 144:ef7eb2e8f9f7 135 {
<> 144:ef7eb2e8f9f7 136 pwmout_pulsewidth_us(obj, ms * 1000);
<> 144:ef7eb2e8f9f7 137 }
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
<> 144:ef7eb2e8f9f7 140 {
<> 144:ef7eb2e8f9f7 141 float value = (float)(2 * us) / (float)obj->period;
<> 144:ef7eb2e8f9f7 142 pwmout_write(obj, value);
<> 144:ef7eb2e8f9f7 143 }
<> 144:ef7eb2e8f9f7 144
<> 144:ef7eb2e8f9f7 145 #endif