mbed official / mbed-dev

mbed library sources. Supersedes mbed-src.

Dependents:   Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more

targets/TARGET_NUVOTON/TARGET_NANO100/pwmout_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
176:447f873cad2f 
mbed library release version 165

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AnnaBridge 174:b96e65c34a4d 1 /* mbed Microcontroller Library
AnnaBridge 174:b96e65c34a4d 2 * Copyright (c) 2015-2017 Nuvoton
AnnaBridge 174:b96e65c34a4d 3 *
AnnaBridge 174:b96e65c34a4d 4 * Licensed under the Apache License, Version 2.0 (the "License");
AnnaBridge 174:b96e65c34a4d 5 * you may not use this file except in compliance with the License.
AnnaBridge 174:b96e65c34a4d 6 * You may obtain a copy of the License at
AnnaBridge 174:b96e65c34a4d 7 *
AnnaBridge 174:b96e65c34a4d 8 * http://www.apache.org/licenses/LICENSE-2.0
AnnaBridge 174:b96e65c34a4d 9 *
AnnaBridge 174:b96e65c34a4d 10 * Unless required by applicable law or agreed to in writing, software
AnnaBridge 174:b96e65c34a4d 11 * distributed under the License is distributed on an "AS IS" BASIS,
AnnaBridge 174:b96e65c34a4d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
AnnaBridge 174:b96e65c34a4d 13 * See the License for the specific language governing permissions and
AnnaBridge 174:b96e65c34a4d 14 * limitations under the License.
AnnaBridge 174:b96e65c34a4d 15 */
AnnaBridge 174:b96e65c34a4d 16
AnnaBridge 174:b96e65c34a4d 17 #include "pwmout_api.h"
AnnaBridge 174:b96e65c34a4d 18
AnnaBridge 174:b96e65c34a4d 19 #if DEVICE_PWMOUT
AnnaBridge 174:b96e65c34a4d 20
AnnaBridge 174:b96e65c34a4d 21 #include "cmsis.h"
AnnaBridge 174:b96e65c34a4d 22 #include "pinmap.h"
AnnaBridge 174:b96e65c34a4d 23 #include "PeripheralPins.h"
AnnaBridge 174:b96e65c34a4d 24 #include "nu_modutil.h"
AnnaBridge 174:b96e65c34a4d 25 #include "nu_miscutil.h"
AnnaBridge 174:b96e65c34a4d 26 #include "nu_bitutil.h"
AnnaBridge 174:b96e65c34a4d 27
AnnaBridge 174:b96e65c34a4d 28 struct nu_pwm_var {
AnnaBridge 174:b96e65c34a4d 29 uint32_t en_msk;
AnnaBridge 174:b96e65c34a4d 30 };
AnnaBridge 174:b96e65c34a4d 31
AnnaBridge 174:b96e65c34a4d 32 static struct nu_pwm_var pwm0_01_var = {
AnnaBridge 174:b96e65c34a4d 33 .en_msk = 0
AnnaBridge 174:b96e65c34a4d 34 };
AnnaBridge 174:b96e65c34a4d 35
AnnaBridge 174:b96e65c34a4d 36 static struct nu_pwm_var pwm0_23_var = {
AnnaBridge 174:b96e65c34a4d 37 .en_msk = 0
AnnaBridge 174:b96e65c34a4d 38 };
AnnaBridge 174:b96e65c34a4d 39
AnnaBridge 174:b96e65c34a4d 40 static struct nu_pwm_var pwm1_01_var = {
AnnaBridge 174:b96e65c34a4d 41 .en_msk = 0
AnnaBridge 174:b96e65c34a4d 42 };
AnnaBridge 174:b96e65c34a4d 43
AnnaBridge 174:b96e65c34a4d 44 static struct nu_pwm_var pwm1_23_var = {
AnnaBridge 174:b96e65c34a4d 45 .en_msk = 0
AnnaBridge 174:b96e65c34a4d 46 };
AnnaBridge 174:b96e65c34a4d 47
AnnaBridge 174:b96e65c34a4d 48 static uint32_t pwm_modinit_mask = 0;
AnnaBridge 174:b96e65c34a4d 49
AnnaBridge 174:b96e65c34a4d 50 static const struct nu_modinit_s pwm_modinit_tab[] = {
AnnaBridge 174:b96e65c34a4d 51 {PWM_0_0, PWM0_CH01_MODULE, CLK_CLKSEL1_PWM0_CH01_S_HCLK, 0, PWM0_RST, PWM0_IRQn, &pwm0_01_var},
AnnaBridge 174:b96e65c34a4d 52 {PWM_0_1, PWM0_CH01_MODULE, CLK_CLKSEL1_PWM0_CH01_S_HCLK, 0, PWM0_RST, PWM0_IRQn, &pwm0_01_var},
AnnaBridge 174:b96e65c34a4d 53 {PWM_0_2, PWM0_CH23_MODULE, CLK_CLKSEL1_PWM0_CH23_S_HCLK, 0, PWM0_RST, PWM0_IRQn, &pwm0_23_var},
AnnaBridge 174:b96e65c34a4d 54 {PWM_0_3, PWM0_CH23_MODULE, CLK_CLKSEL1_PWM0_CH23_S_HCLK, 0, PWM0_RST, PWM0_IRQn, &pwm0_23_var},
AnnaBridge 174:b96e65c34a4d 55
AnnaBridge 174:b96e65c34a4d 56 {PWM_1_0, PWM1_CH01_MODULE, CLK_CLKSEL2_PWM1_CH01_S_HCLK, 0, PWM1_RST, PWM1_IRQn, &pwm1_01_var},
AnnaBridge 174:b96e65c34a4d 57 {PWM_1_1, PWM1_CH01_MODULE, CLK_CLKSEL2_PWM1_CH01_S_HCLK, 0, PWM1_RST, PWM1_IRQn, &pwm1_01_var},
AnnaBridge 174:b96e65c34a4d 58 {PWM_1_2, PWM1_CH23_MODULE, CLK_CLKSEL2_PWM1_CH23_S_HCLK, 0, PWM1_RST, PWM1_IRQn, &pwm1_23_var},
AnnaBridge 174:b96e65c34a4d 59 {PWM_1_3, PWM1_CH23_MODULE, CLK_CLKSEL2_PWM1_CH23_S_HCLK, 0, PWM1_RST, PWM1_IRQn, &pwm1_23_var},
AnnaBridge 174:b96e65c34a4d 60
AnnaBridge 174:b96e65c34a4d 61 {NC, 0, 0, 0, 0, (IRQn_Type) 0, NULL}
AnnaBridge 174:b96e65c34a4d 62 };
AnnaBridge 174:b96e65c34a4d 63
AnnaBridge 174:b96e65c34a4d 64 static void pwmout_config(pwmout_t* obj);
AnnaBridge 174:b96e65c34a4d 65
AnnaBridge 174:b96e65c34a4d 66 void pwmout_init(pwmout_t* obj, PinName pin)
AnnaBridge 174:b96e65c34a4d 67 {
AnnaBridge 174:b96e65c34a4d 68 obj->pwm = (PWMName) pinmap_peripheral(pin, PinMap_PWM);
AnnaBridge 174:b96e65c34a4d 69 MBED_ASSERT((int) obj->pwm != NC);
AnnaBridge 174:b96e65c34a4d 70
AnnaBridge 174:b96e65c34a4d 71 const struct nu_modinit_s *modinit = get_modinit(obj->pwm, pwm_modinit_tab);
AnnaBridge 174:b96e65c34a4d 72 MBED_ASSERT(modinit != NULL);
AnnaBridge 174:b96e65c34a4d 73 MBED_ASSERT((PWMName) modinit->modname == obj->pwm);
AnnaBridge 174:b96e65c34a4d 74
AnnaBridge 174:b96e65c34a4d 75 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(obj->pwm);
AnnaBridge 174:b96e65c34a4d 76 uint32_t chn = NU_MODSUBINDEX(obj->pwm);
AnnaBridge 174:b96e65c34a4d 77
AnnaBridge 174:b96e65c34a4d 78 // NOTE: Channels 0/1, 2/3 share a clock source.
AnnaBridge 174:b96e65c34a4d 79 if ((((struct nu_pwm_var *) modinit->var)->en_msk & 0xF) == 0) {
AnnaBridge 174:b96e65c34a4d 80 // Select clock source of paired channels
AnnaBridge 174:b96e65c34a4d 81 CLK_SetModuleClock(modinit->clkidx, modinit->clksrc, modinit->clkdiv);
AnnaBridge 174:b96e65c34a4d 82 // Enable clock of paired channels
AnnaBridge 174:b96e65c34a4d 83 CLK_EnableModuleClock(modinit->clkidx);
AnnaBridge 174:b96e65c34a4d 84 }
AnnaBridge 174:b96e65c34a4d 85
AnnaBridge 174:b96e65c34a4d 86 // Wire pinout
AnnaBridge 174:b96e65c34a4d 87 pinmap_pinout(pin, PinMap_PWM);
AnnaBridge 174:b96e65c34a4d 88
AnnaBridge 174:b96e65c34a4d 89 // Default: period = 10 ms, pulse width = 0 ms
AnnaBridge 174:b96e65c34a4d 90 obj->period_us = 1000 * 10;
AnnaBridge 174:b96e65c34a4d 91 obj->pulsewidth_us = 0;
AnnaBridge 174:b96e65c34a4d 92 pwmout_config(obj);
AnnaBridge 174:b96e65c34a4d 93 // enable inverter to ensure the first PWM cycle is correct
AnnaBridge 174:b96e65c34a4d 94 pwm_base->CTL |= (PWM_CTL_CH0INV_Msk << (chn * 8));
AnnaBridge 174:b96e65c34a4d 95
AnnaBridge 174:b96e65c34a4d 96 // Enable output of the specified PWM channel
AnnaBridge 174:b96e65c34a4d 97 PWM_EnableOutput(pwm_base, 1 << chn);
AnnaBridge 174:b96e65c34a4d 98 PWM_Start(pwm_base, 1 << chn);
AnnaBridge 174:b96e65c34a4d 99
AnnaBridge 174:b96e65c34a4d 100 ((struct nu_pwm_var *) modinit->var)->en_msk |= 1 << chn;
AnnaBridge 174:b96e65c34a4d 101
AnnaBridge 174:b96e65c34a4d 102 if (((struct nu_pwm_var *) modinit->var)->en_msk) {
AnnaBridge 174:b96e65c34a4d 103 // Mark this module to be inited.
AnnaBridge 174:b96e65c34a4d 104 int i = modinit - pwm_modinit_tab;
AnnaBridge 174:b96e65c34a4d 105 pwm_modinit_mask |= 1 << i;
AnnaBridge 174:b96e65c34a4d 106 }
AnnaBridge 174:b96e65c34a4d 107 }
AnnaBridge 174:b96e65c34a4d 108
AnnaBridge 174:b96e65c34a4d 109 void pwmout_free(pwmout_t* obj)
AnnaBridge 174:b96e65c34a4d 110 {
AnnaBridge 174:b96e65c34a4d 111 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(obj->pwm);
AnnaBridge 174:b96e65c34a4d 112 uint32_t chn = NU_MODSUBINDEX(obj->pwm);
AnnaBridge 174:b96e65c34a4d 113 PWM_ForceStop(pwm_base, 1 << chn);
AnnaBridge 174:b96e65c34a4d 114
AnnaBridge 174:b96e65c34a4d 115 const struct nu_modinit_s *modinit = get_modinit(obj->pwm, pwm_modinit_tab);
AnnaBridge 174:b96e65c34a4d 116 MBED_ASSERT(modinit != NULL);
AnnaBridge 174:b96e65c34a4d 117 MBED_ASSERT((PWMName) modinit->modname == obj->pwm);
AnnaBridge 174:b96e65c34a4d 118 ((struct nu_pwm_var *) modinit->var)->en_msk &= ~(1 << chn);
AnnaBridge 174:b96e65c34a4d 119
AnnaBridge 174:b96e65c34a4d 120
AnnaBridge 174:b96e65c34a4d 121 if ((((struct nu_pwm_var *) modinit->var)->en_msk & 0xF) == 0) {
AnnaBridge 174:b96e65c34a4d 122 CLK_DisableModuleClock(modinit->clkidx);
AnnaBridge 174:b96e65c34a4d 123 }
AnnaBridge 174:b96e65c34a4d 124
AnnaBridge 174:b96e65c34a4d 125 if (((struct nu_pwm_var *) modinit->var)->en_msk == 0) {
AnnaBridge 174:b96e65c34a4d 126 // Mark this module to be deinited.
AnnaBridge 174:b96e65c34a4d 127 int i = modinit - pwm_modinit_tab;
AnnaBridge 174:b96e65c34a4d 128 pwm_modinit_mask &= ~(1 << i);
AnnaBridge 174:b96e65c34a4d 129 }
AnnaBridge 174:b96e65c34a4d 130 }
AnnaBridge 174:b96e65c34a4d 131
AnnaBridge 174:b96e65c34a4d 132 void pwmout_write(pwmout_t* obj, float value)
AnnaBridge 174:b96e65c34a4d 133 {
AnnaBridge 174:b96e65c34a4d 134 obj->pulsewidth_us = NU_CLAMP((uint32_t) (value * obj->period_us), 0, obj->period_us);
AnnaBridge 174:b96e65c34a4d 135 pwmout_config(obj);
AnnaBridge 174:b96e65c34a4d 136 }
AnnaBridge 174:b96e65c34a4d 137
AnnaBridge 174:b96e65c34a4d 138 float pwmout_read(pwmout_t* obj)
AnnaBridge 174:b96e65c34a4d 139 {
AnnaBridge 174:b96e65c34a4d 140 return NU_CLAMP((((float) obj->pulsewidth_us) / obj->period_us), 0.0f, 1.0f);
AnnaBridge 174:b96e65c34a4d 141 }
AnnaBridge 174:b96e65c34a4d 142
AnnaBridge 174:b96e65c34a4d 143 void pwmout_period(pwmout_t* obj, float seconds)
AnnaBridge 174:b96e65c34a4d 144 {
AnnaBridge 174:b96e65c34a4d 145 pwmout_period_us(obj, seconds * 1000000.0f);
AnnaBridge 174:b96e65c34a4d 146 }
AnnaBridge 174:b96e65c34a4d 147
AnnaBridge 174:b96e65c34a4d 148 void pwmout_period_ms(pwmout_t* obj, int ms)
AnnaBridge 174:b96e65c34a4d 149 {
AnnaBridge 174:b96e65c34a4d 150 pwmout_period_us(obj, ms * 1000);
AnnaBridge 174:b96e65c34a4d 151 }
AnnaBridge 174:b96e65c34a4d 152
AnnaBridge 174:b96e65c34a4d 153 // Set the PWM period, keeping the duty cycle the same.
AnnaBridge 174:b96e65c34a4d 154 void pwmout_period_us(pwmout_t* obj, int us)
AnnaBridge 174:b96e65c34a4d 155 {
AnnaBridge 174:b96e65c34a4d 156 uint32_t period_us_old = obj->period_us;
AnnaBridge 174:b96e65c34a4d 157 uint32_t pulsewidth_us_old = obj->pulsewidth_us;
AnnaBridge 174:b96e65c34a4d 158 obj->period_us = us;
AnnaBridge 174:b96e65c34a4d 159 obj->pulsewidth_us = NU_CLAMP(obj->period_us * pulsewidth_us_old / period_us_old, 0, obj->period_us);
AnnaBridge 174:b96e65c34a4d 160 pwmout_config(obj);
AnnaBridge 174:b96e65c34a4d 161 }
AnnaBridge 174:b96e65c34a4d 162
AnnaBridge 174:b96e65c34a4d 163 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
AnnaBridge 174:b96e65c34a4d 164 {
AnnaBridge 174:b96e65c34a4d 165 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
AnnaBridge 174:b96e65c34a4d 166 }
AnnaBridge 174:b96e65c34a4d 167
AnnaBridge 174:b96e65c34a4d 168 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
AnnaBridge 174:b96e65c34a4d 169 {
AnnaBridge 174:b96e65c34a4d 170 pwmout_pulsewidth_us(obj, ms * 1000);
AnnaBridge 174:b96e65c34a4d 171 }
AnnaBridge 174:b96e65c34a4d 172
AnnaBridge 174:b96e65c34a4d 173 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
AnnaBridge 174:b96e65c34a4d 174 {
AnnaBridge 174:b96e65c34a4d 175 obj->pulsewidth_us = NU_CLAMP(us, 0, obj->period_us);
AnnaBridge 174:b96e65c34a4d 176 pwmout_config(obj);
AnnaBridge 174:b96e65c34a4d 177 }
AnnaBridge 174:b96e65c34a4d 178
AnnaBridge 174:b96e65c34a4d 179 static void pwmout_config(pwmout_t* obj)
AnnaBridge 174:b96e65c34a4d 180 {
AnnaBridge 174:b96e65c34a4d 181 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(obj->pwm);
AnnaBridge 174:b96e65c34a4d 182 uint32_t chn = NU_MODSUBINDEX(obj->pwm);
AnnaBridge 174:b96e65c34a4d 183 // NOTE: Support period < 1s
AnnaBridge 174:b96e65c34a4d 184 // NOTE: ARM mbed CI test fails due to first PWM pulse error. Workaround by:
AnnaBridge 174:b96e65c34a4d 185 // 1. Inverse duty cycle (100 - duty)
AnnaBridge 174:b96e65c34a4d 186 // 2. Inverse PWM output polarity
AnnaBridge 174:b96e65c34a4d 187 // This trick is here to pass ARM mbed CI test. First PWM pulse error still remains.
AnnaBridge 174:b96e65c34a4d 188 PWM_ConfigOutputChannel2(pwm_base, chn, 1000 * 1000, 100 - (obj->pulsewidth_us * 100 / obj->period_us), obj->period_us);
AnnaBridge 174:b96e65c34a4d 189 }
AnnaBridge 174:b96e65c34a4d 190
AnnaBridge 174:b96e65c34a4d 191 #endif