siva surendar / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NUVOTON/TARGET_M451/pwmout_api.c@150:da61ba4e9755, 2016-11-25 (annotated)

Committer:
sivasuren
Date:
Fri Nov 25 07:57:40 2016 +0000
Revision:
150:da61ba4e9755
Parent:
149:156823d33999 
surendar changes

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 * Copyright (c) 2015-2016 Nuvoton
<> 149:156823d33999 3 *
<> 149:156823d33999 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 149:156823d33999 5 * you may not use this file except in compliance with the License.
<> 149:156823d33999 6 * You may obtain a copy of the License at
<> 149:156823d33999 7 *
<> 149:156823d33999 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 149:156823d33999 9 *
<> 149:156823d33999 10 * Unless required by applicable law or agreed to in writing, software
<> 149:156823d33999 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 149:156823d33999 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 149:156823d33999 13 * See the License for the specific language governing permissions and
<> 149:156823d33999 14 * limitations under the License.
<> 149:156823d33999 15 */
<> 149:156823d33999 16
<> 149:156823d33999 17 #include "pwmout_api.h"
<> 149:156823d33999 18
<> 149:156823d33999 19 #if DEVICE_PWMOUT
<> 149:156823d33999 20
<> 149:156823d33999 21 #include "cmsis.h"
<> 149:156823d33999 22 #include "pinmap.h"
<> 149:156823d33999 23 #include "PeripheralPins.h"
<> 149:156823d33999 24 #include "nu_modutil.h"
<> 149:156823d33999 25 #include "nu_miscutil.h"
<> 149:156823d33999 26 #include "nu_bitutil.h"
<> 149:156823d33999 27
<> 149:156823d33999 28 struct nu_pwm_var {
<> 149:156823d33999 29 uint32_t en_msk;
<> 149:156823d33999 30 };
<> 149:156823d33999 31
<> 149:156823d33999 32 static struct nu_pwm_var pwm0_var = {
<> 149:156823d33999 33 .en_msk = 0
<> 149:156823d33999 34 };
<> 149:156823d33999 35
<> 149:156823d33999 36 static struct nu_pwm_var pwm1_var = {
<> 149:156823d33999 37 .en_msk = 0
<> 149:156823d33999 38 };
<> 149:156823d33999 39
<> 149:156823d33999 40 static uint32_t pwm_modinit_mask = 0;
<> 149:156823d33999 41
<> 149:156823d33999 42 static const struct nu_modinit_s pwm_modinit_tab[] = {
<> 149:156823d33999 43 {PWM_0_0, PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0, PWM0_RST, PWM0P0_IRQn, &pwm0_var},
<> 149:156823d33999 44 {PWM_0_1, PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0, PWM0_RST, PWM0P0_IRQn, &pwm0_var},
<> 149:156823d33999 45 {PWM_0_2, PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0, PWM0_RST, PWM0P1_IRQn, &pwm0_var},
<> 149:156823d33999 46 {PWM_0_3, PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0, PWM0_RST, PWM0P1_IRQn, &pwm0_var},
<> 149:156823d33999 47 {PWM_0_4, PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0, PWM0_RST, PWM0P2_IRQn, &pwm0_var},
<> 149:156823d33999 48 {PWM_0_5, PWM0_MODULE, CLK_CLKSEL2_PWM0SEL_PCLK0, 0, PWM0_RST, PWM0P2_IRQn, &pwm0_var},
<> 149:156823d33999 49
<> 149:156823d33999 50 {PWM_1_0, PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK1, 0, PWM1_RST, PWM1P0_IRQn, &pwm1_var},
<> 149:156823d33999 51 {PWM_1_1, PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK1, 0, PWM1_RST, PWM1P0_IRQn, &pwm1_var},
<> 149:156823d33999 52 {PWM_1_2, PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK1, 0, PWM1_RST, PWM1P1_IRQn, &pwm1_var},
<> 149:156823d33999 53 {PWM_1_3, PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK1, 0, PWM1_RST, PWM1P1_IRQn, &pwm1_var},
<> 149:156823d33999 54 {PWM_1_4, PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK1, 0, PWM1_RST, PWM1P2_IRQn, &pwm1_var},
<> 149:156823d33999 55 {PWM_1_5, PWM1_MODULE, CLK_CLKSEL2_PWM1SEL_PCLK1, 0, PWM1_RST, PWM1P2_IRQn, &pwm1_var},
<> 149:156823d33999 56
<> 149:156823d33999 57 {NC, 0, 0, 0, 0, (IRQn_Type) 0, NULL}
<> 149:156823d33999 58 };
<> 149:156823d33999 59
<> 149:156823d33999 60 static void pwmout_config(pwmout_t* obj);
<> 149:156823d33999 61
<> 149:156823d33999 62 void pwmout_init(pwmout_t* obj, PinName pin)
<> 149:156823d33999 63 {
<> 149:156823d33999 64 obj->pwm = (PWMName) pinmap_peripheral(pin, PinMap_PWM);
<> 149:156823d33999 65 MBED_ASSERT((int) obj->pwm != NC);
<> 149:156823d33999 66
<> 149:156823d33999 67 const struct nu_modinit_s *modinit = get_modinit(obj->pwm, pwm_modinit_tab);
<> 149:156823d33999 68 MBED_ASSERT(modinit != NULL);
<> 149:156823d33999 69 MBED_ASSERT(modinit->modname == obj->pwm);
<> 149:156823d33999 70
<> 149:156823d33999 71 // NOTE: All channels (identified by PWMName) share a PWM module. This reset will also affect other channels of the same PWM module.
<> 149:156823d33999 72 if (! ((struct nu_pwm_var *) modinit->var)->en_msk) {
<> 149:156823d33999 73 // Reset this module if no channel enabled
<> 149:156823d33999 74 SYS_ResetModule(modinit->rsetidx);
<> 149:156823d33999 75 }
<> 149:156823d33999 76
<> 149:156823d33999 77 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(obj->pwm);
<> 149:156823d33999 78 uint32_t chn = NU_MODSUBINDEX(obj->pwm);
<> 149:156823d33999 79
<> 149:156823d33999 80 // NOTE: Channels 0/1/2/3/4/5 share a clock source.
<> 149:156823d33999 81 if ((((struct nu_pwm_var *) modinit->var)->en_msk & 0x3F) == 0) {
<> 149:156823d33999 82 // Select clock source of paired channels
<> 149:156823d33999 83 CLK_SetModuleClock(modinit->clkidx, modinit->clksrc, modinit->clkdiv);
<> 149:156823d33999 84 // Enable clock of paired channels
<> 149:156823d33999 85 CLK_EnableModuleClock(modinit->clkidx);
<> 149:156823d33999 86 }
<> 149:156823d33999 87
<> 149:156823d33999 88 // Wire pinout
<> 149:156823d33999 89 pinmap_pinout(pin, PinMap_PWM);
<> 149:156823d33999 90
<> 149:156823d33999 91 // Default: period = 10 ms, pulse width = 0 ms
<> 149:156823d33999 92 obj->period_us = 1000 * 10;
<> 149:156823d33999 93 obj->pulsewidth_us = 0;
<> 149:156823d33999 94 pwmout_config(obj);
<> 149:156823d33999 95
<> 149:156823d33999 96 // Enable output of the specified PWM channel
<> 149:156823d33999 97 PWM_EnableOutput(pwm_base, 1 << chn);
<> 149:156823d33999 98 PWM_Start(pwm_base, 1 << chn);
<> 149:156823d33999 99
<> 149:156823d33999 100 ((struct nu_pwm_var *) modinit->var)->en_msk |= 1 << chn;
<> 149:156823d33999 101
<> 149:156823d33999 102 // Mark this module to be inited.
<> 149:156823d33999 103 int i = modinit - pwm_modinit_tab;
<> 149:156823d33999 104 pwm_modinit_mask |= 1 << i;
<> 149:156823d33999 105 }
<> 149:156823d33999 106
<> 149:156823d33999 107 void pwmout_free(pwmout_t* obj)
<> 149:156823d33999 108 {
<> 149:156823d33999 109 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(obj->pwm);
<> 149:156823d33999 110 uint32_t chn = NU_MODSUBINDEX(obj->pwm);
<> 149:156823d33999 111 PWM_ForceStop(pwm_base, 1 << chn);
<> 149:156823d33999 112
<> 149:156823d33999 113 const struct nu_modinit_s *modinit = get_modinit(obj->pwm, pwm_modinit_tab);
<> 149:156823d33999 114 MBED_ASSERT(modinit != NULL);
<> 149:156823d33999 115 MBED_ASSERT(modinit->modname == obj->pwm);
<> 149:156823d33999 116 ((struct nu_pwm_var *) modinit->var)->en_msk &= ~(1 << chn);
<> 149:156823d33999 117
<> 149:156823d33999 118
<> 149:156823d33999 119 if ((((struct nu_pwm_var *) modinit->var)->en_msk & 0x3F) == 0) {
<> 149:156823d33999 120 CLK_DisableModuleClock(modinit->clkidx);
<> 149:156823d33999 121 }
<> 149:156823d33999 122
<> 149:156823d33999 123 // Mark this module to be deinited.
<> 149:156823d33999 124 int i = modinit - pwm_modinit_tab;
<> 149:156823d33999 125 pwm_modinit_mask &= ~(1 << i);
<> 149:156823d33999 126 }
<> 149:156823d33999 127
<> 149:156823d33999 128 void pwmout_write(pwmout_t* obj, float value)
<> 149:156823d33999 129 {
<> 149:156823d33999 130 obj->pulsewidth_us = NU_CLAMP((uint32_t) (value * obj->period_us), 0, obj->period_us);
<> 149:156823d33999 131 pwmout_config(obj);
<> 149:156823d33999 132 }
<> 149:156823d33999 133
<> 149:156823d33999 134 float pwmout_read(pwmout_t* obj)
<> 149:156823d33999 135 {
<> 149:156823d33999 136 return NU_CLAMP((((float) obj->pulsewidth_us) / obj->period_us), 0.0f, 1.0f);
<> 149:156823d33999 137 }
<> 149:156823d33999 138
<> 149:156823d33999 139 void pwmout_period(pwmout_t* obj, float seconds)
<> 149:156823d33999 140 {
<> 149:156823d33999 141 pwmout_period_us(obj, seconds * 1000000.0f);
<> 149:156823d33999 142 }
<> 149:156823d33999 143
<> 149:156823d33999 144 void pwmout_period_ms(pwmout_t* obj, int ms)
<> 149:156823d33999 145 {
<> 149:156823d33999 146 pwmout_period_us(obj, ms * 1000);
<> 149:156823d33999 147 }
<> 149:156823d33999 148
<> 149:156823d33999 149 // Set the PWM period, keeping the duty cycle the same.
<> 149:156823d33999 150 void pwmout_period_us(pwmout_t* obj, int us)
<> 149:156823d33999 151 {
<> 149:156823d33999 152 uint32_t period_us_old = obj->period_us;
<> 149:156823d33999 153 uint32_t pulsewidth_us_old = obj->pulsewidth_us;
<> 149:156823d33999 154 obj->period_us = us;
<> 149:156823d33999 155 obj->pulsewidth_us = NU_CLAMP(obj->period_us * pulsewidth_us_old / period_us_old, 0, obj->period_us);
<> 149:156823d33999 156 pwmout_config(obj);
<> 149:156823d33999 157 }
<> 149:156823d33999 158
<> 149:156823d33999 159 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
<> 149:156823d33999 160 {
<> 149:156823d33999 161 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
<> 149:156823d33999 162 }
<> 149:156823d33999 163
<> 149:156823d33999 164 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
<> 149:156823d33999 165 {
<> 149:156823d33999 166 pwmout_pulsewidth_us(obj, ms * 1000);
<> 149:156823d33999 167 }
<> 149:156823d33999 168
<> 149:156823d33999 169 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
<> 149:156823d33999 170 {
<> 149:156823d33999 171 obj->pulsewidth_us = NU_CLAMP(us, 0, obj->period_us);
<> 149:156823d33999 172 pwmout_config(obj);
<> 149:156823d33999 173 }
<> 149:156823d33999 174
<> 149:156823d33999 175 int pwmout_allow_powerdown(void)
<> 149:156823d33999 176 {
<> 149:156823d33999 177 uint32_t modinit_mask = pwm_modinit_mask;
<> 149:156823d33999 178 while (modinit_mask) {
<> 149:156823d33999 179 int pwm_idx = nu_ctz(modinit_mask);
<> 149:156823d33999 180 const struct nu_modinit_s *modinit = pwm_modinit_tab + pwm_idx;
<> 149:156823d33999 181 if (modinit->modname != NC) {
<> 149:156823d33999 182 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(modinit->modname);
<> 149:156823d33999 183 uint32_t chn = NU_MODSUBINDEX(modinit->modname);
<> 149:156823d33999 184 // Disallow entering power-down mode if PWM counter is enabled.
<> 149:156823d33999 185 if ((pwm_base->CNTEN & (1 << chn)) && pwm_base->CMPDAT[chn]) {
<> 149:156823d33999 186 return 0;
<> 149:156823d33999 187 }
<> 149:156823d33999 188 }
<> 149:156823d33999 189 modinit_mask &= ~(1 << pwm_idx);
<> 149:156823d33999 190 }
<> 149:156823d33999 191
<> 149:156823d33999 192 return 1;
<> 149:156823d33999 193 }
<> 149:156823d33999 194
<> 149:156823d33999 195 static void pwmout_config(pwmout_t* obj)
<> 149:156823d33999 196 {
<> 149:156823d33999 197 PWM_T *pwm_base = (PWM_T *) NU_MODBASE(obj->pwm);
<> 149:156823d33999 198 uint32_t chn = NU_MODSUBINDEX(obj->pwm);
<> 149:156823d33999 199 // NOTE: Support period < 1s
<> 149:156823d33999 200 //PWM_ConfigOutputChannel(pwm_base, chn, 1000 * 1000 / obj->period_us, obj->pulsewidth_us * 100 / obj->period_us);
<> 149:156823d33999 201 PWM_ConfigOutputChannel2(pwm_base, chn, 1000 * 1000, obj->pulsewidth_us * 100 / obj->period_us, obj->period_us);
<> 149:156823d33999 202 }
<> 149:156823d33999 203
<> 149:156823d33999 204 #endif