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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

Import librarymbed

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_NXP/TARGET_LPC82X/pwmout_api.c@548:1abac31e188e, 2015-05-22 (annotated)

Committer:
mbed_official
Date:
Fri May 22 10:45:46 2015 +0100
Revision:
548:1abac31e188e
Parent:
516:b3fb5c6901a6
Child:
557:42efda18ac92
Synchronized with git revision 88d158e43b54f97c5e94da305ea9a096889cc81b



Full URL: https://github.com/mbedmicro/mbed/commit/88d158e43b54f97c5e94da305ea9a096889cc81b/



Silicon Labs - Cosmetic: apply mbed coding style to HAL

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 337:6ed01c00b962 1 /* mbed Microcontroller Library
mbed_official 337:6ed01c00b962 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 337:6ed01c00b962 3 *
mbed_official 337:6ed01c00b962 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 337:6ed01c00b962 5 * you may not use this file except in compliance with the License.
mbed_official 337:6ed01c00b962 6 * You may obtain a copy of the License at
mbed_official 337:6ed01c00b962 7 *
mbed_official 337:6ed01c00b962 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 337:6ed01c00b962 9 *
mbed_official 337:6ed01c00b962 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 337:6ed01c00b962 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 337:6ed01c00b962 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 337:6ed01c00b962 13 * See the License for the specific language governing permissions and
mbed_official 337:6ed01c00b962 14 * limitations under the License.
mbed_official 337:6ed01c00b962 15 */
mbed_official 337:6ed01c00b962 16 #include "mbed_assert.h"
mbed_official 337:6ed01c00b962 17 #include "pwmout_api.h"
mbed_official 337:6ed01c00b962 18 #include "cmsis.h"
mbed_official 337:6ed01c00b962 19 #include "pinmap.h"
mbed_official 337:6ed01c00b962 20 #include "mbed_error.h"
mbed_official 337:6ed01c00b962 21
mbed_official 337:6ed01c00b962 22 #if DEVICE_PWMOUT
mbed_official 337:6ed01c00b962 23
mbed_official 337:6ed01c00b962 24 // bit flags for used SCTs
mbed_official 337:6ed01c00b962 25 static unsigned char sct_used = 0;
mbed_official 337:6ed01c00b962 26
mbed_official 337:6ed01c00b962 27 static int get_available_sct()
mbed_official 337:6ed01c00b962 28 {
mbed_official 337:6ed01c00b962 29 int i;
mbed_official 337:6ed01c00b962 30 for (i = 0; i < 4; i++) {
mbed_official 337:6ed01c00b962 31 if ((sct_used & (1 << i)) == 0)
mbed_official 337:6ed01c00b962 32 return i;
mbed_official 337:6ed01c00b962 33 }
mbed_official 337:6ed01c00b962 34 return -1;
mbed_official 337:6ed01c00b962 35 }
mbed_official 337:6ed01c00b962 36
mbed_official 337:6ed01c00b962 37 void pwmout_init(pwmout_t* obj, PinName pin)
mbed_official 337:6ed01c00b962 38 {
mbed_official 337:6ed01c00b962 39 MBED_ASSERT(pin != (uint32_t)NC);
mbed_official 337:6ed01c00b962 40
mbed_official 337:6ed01c00b962 41 int sct_n = get_available_sct();
mbed_official 337:6ed01c00b962 42 if (sct_n == -1) {
mbed_official 337:6ed01c00b962 43 error("No available SCT");
mbed_official 337:6ed01c00b962 44 }
mbed_official 337:6ed01c00b962 45
mbed_official 337:6ed01c00b962 46 sct_used |= (1 << sct_n);
mbed_official 337:6ed01c00b962 47
mbed_official 337:6ed01c00b962 48 obj->pwm = (LPC_SCT_Type*)LPC_SCT;
mbed_official 337:6ed01c00b962 49 obj->pwm_ch = sct_n;
mbed_official 337:6ed01c00b962 50
mbed_official 516:b3fb5c6901a6 51 LPC_SCT_Type* pwm = obj->pwm;
mbed_official 337:6ed01c00b962 52
mbed_official 337:6ed01c00b962 53 // Enable the SCT clock
mbed_official 337:6ed01c00b962 54 LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 8);
mbed_official 337:6ed01c00b962 55
mbed_official 337:6ed01c00b962 56 // Clear peripheral reset the SCT:
mbed_official 337:6ed01c00b962 57 LPC_SYSCON->PRESETCTRL |= (1 << 8);
mbed_official 337:6ed01c00b962 58
mbed_official 337:6ed01c00b962 59 switch(sct_n) {
mbed_official 337:6ed01c00b962 60 case 0:
mbed_official 337:6ed01c00b962 61 // SCT_OUT0
mbed_official 337:6ed01c00b962 62 LPC_SWM->PINASSIGN[7] &= ~0xFF000000;
mbed_official 337:6ed01c00b962 63 LPC_SWM->PINASSIGN[7] |= ((pin >> PIN_SHIFT) << 24);
mbed_official 337:6ed01c00b962 64 break;
mbed_official 337:6ed01c00b962 65 case 1:
mbed_official 337:6ed01c00b962 66 // SCT_OUT1
mbed_official 337:6ed01c00b962 67 LPC_SWM->PINASSIGN[8] &= ~0x000000FF;
mbed_official 337:6ed01c00b962 68 LPC_SWM->PINASSIGN[8] |= (pin >> PIN_SHIFT);
mbed_official 337:6ed01c00b962 69 break;
mbed_official 337:6ed01c00b962 70 case 2:
mbed_official 337:6ed01c00b962 71 // SCT2_OUT2
mbed_official 337:6ed01c00b962 72 LPC_SWM->PINASSIGN[8] &= ~0x0000FF00;
mbed_official 337:6ed01c00b962 73 LPC_SWM->PINASSIGN[8] |= ((pin >> PIN_SHIFT) << 8);
mbed_official 337:6ed01c00b962 74 break;
mbed_official 337:6ed01c00b962 75 case 3:
mbed_official 337:6ed01c00b962 76 // SCT3_OUT3
mbed_official 337:6ed01c00b962 77 LPC_SWM->PINASSIGN[8] &= ~0x00FF0000;
mbed_official 337:6ed01c00b962 78 LPC_SWM->PINASSIGN[8] |= ((pin >> PIN_SHIFT) << 16);
mbed_official 337:6ed01c00b962 79 break;
mbed_official 337:6ed01c00b962 80 default:
mbed_official 337:6ed01c00b962 81 break;
mbed_official 337:6ed01c00b962 82 }
mbed_official 337:6ed01c00b962 83
mbed_official 516:b3fb5c6901a6 84 // Unified 32-bit counter, autolimit
mbed_official 516:b3fb5c6901a6 85 pwm->CONFIG |= ((0x3 << 17) | 0x01);
mbed_official 337:6ed01c00b962 86
mbed_official 337:6ed01c00b962 87 // halt and clear the counter
mbed_official 337:6ed01c00b962 88 pwm->CTRL |= (1 << 2) | (1 << 3);
mbed_official 337:6ed01c00b962 89
mbed_official 337:6ed01c00b962 90 // System Clock -> us_ticker (1)MHz
mbed_official 337:6ed01c00b962 91 pwm->CTRL &= ~(0x7F << 5);
mbed_official 337:6ed01c00b962 92 pwm->CTRL |= (((SystemCoreClock/1000000 - 1) & 0x7F) << 5);
mbed_official 337:6ed01c00b962 93
mbed_official 337:6ed01c00b962 94 pwm->OUT[sct_n].SET = (1 << ((sct_n * 2) + 0));
mbed_official 337:6ed01c00b962 95 pwm->OUT[sct_n].CLR = (1 << ((sct_n * 2) + 1));
mbed_official 337:6ed01c00b962 96
mbed_official 337:6ed01c00b962 97 pwm->EVENT[(sct_n * 2) + 0].CTRL = (1 << 12) | ((sct_n * 2) + 0); // match event
mbed_official 337:6ed01c00b962 98 pwm->EVENT[(sct_n * 2) + 0].STATE = 0xFFFFFFFF;
mbed_official 337:6ed01c00b962 99 pwm->EVENT[(sct_n * 2) + 1].CTRL = (1 << 12) | ((sct_n * 2) + 1);
mbed_official 337:6ed01c00b962 100 pwm->EVENT[(sct_n * 2) + 1].STATE = 0xFFFFFFFF;
mbed_official 337:6ed01c00b962 101
mbed_official 337:6ed01c00b962 102 // unhalt the counter:
mbed_official 337:6ed01c00b962 103 // - clearing bit 2 of the CTRL register
mbed_official 337:6ed01c00b962 104 pwm->CTRL &= ~(1 << 2);
mbed_official 337:6ed01c00b962 105
mbed_official 337:6ed01c00b962 106 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 337:6ed01c00b962 107 pwmout_period_ms(obj, 20);
mbed_official 337:6ed01c00b962 108 pwmout_write (obj, 0);
mbed_official 337:6ed01c00b962 109 }
mbed_official 337:6ed01c00b962 110
mbed_official 337:6ed01c00b962 111 void pwmout_free(pwmout_t* obj)
mbed_official 337:6ed01c00b962 112 {
mbed_official 337:6ed01c00b962 113 // Disable the SCT clock
mbed_official 337:6ed01c00b962 114 LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 8);
mbed_official 337:6ed01c00b962 115 sct_used &= ~(1 << obj->pwm_ch);
mbed_official 337:6ed01c00b962 116 }
mbed_official 337:6ed01c00b962 117
mbed_official 337:6ed01c00b962 118 void pwmout_write(pwmout_t* obj, float value)
mbed_official 337:6ed01c00b962 119 {
mbed_official 337:6ed01c00b962 120 if (value < 0.0f) {
mbed_official 337:6ed01c00b962 121 value = 0.0;
mbed_official 337:6ed01c00b962 122 } else if (value > 1.0f) {
mbed_official 337:6ed01c00b962 123 value = 1.0;
mbed_official 337:6ed01c00b962 124 }
mbed_official 337:6ed01c00b962 125 uint32_t t_on = (uint32_t)((float)(obj->pwm->MATCHREL[obj->pwm_ch * 2]) * value);
mbed_official 337:6ed01c00b962 126 obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 1] = t_on;
mbed_official 337:6ed01c00b962 127 }
mbed_official 337:6ed01c00b962 128
mbed_official 337:6ed01c00b962 129 float pwmout_read(pwmout_t* obj)
mbed_official 337:6ed01c00b962 130 {
mbed_official 337:6ed01c00b962 131 uint32_t t_off = obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 0];
mbed_official 337:6ed01c00b962 132 uint32_t t_on = obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 1];
mbed_official 337:6ed01c00b962 133 float v = (float)t_on/(float)t_off;
mbed_official 337:6ed01c00b962 134 return (v > 1.0f) ? (1.0f) : (v);
mbed_official 337:6ed01c00b962 135 }
mbed_official 337:6ed01c00b962 136
mbed_official 337:6ed01c00b962 137 void pwmout_period(pwmout_t* obj, float seconds)
mbed_official 337:6ed01c00b962 138 {
mbed_official 337:6ed01c00b962 139 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 337:6ed01c00b962 140 }
mbed_official 337:6ed01c00b962 141
mbed_official 337:6ed01c00b962 142 void pwmout_period_ms(pwmout_t* obj, int ms)
mbed_official 337:6ed01c00b962 143 {
mbed_official 337:6ed01c00b962 144 pwmout_period_us(obj, ms * 1000);
mbed_official 337:6ed01c00b962 145 }
mbed_official 337:6ed01c00b962 146
mbed_official 337:6ed01c00b962 147 // Set the PWM period, keeping the duty cycle the same.
mbed_official 337:6ed01c00b962 148 void pwmout_period_us(pwmout_t* obj, int us)
mbed_official 337:6ed01c00b962 149 {
mbed_official 337:6ed01c00b962 150 uint32_t t_off = obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 0];
mbed_official 337:6ed01c00b962 151 uint32_t t_on = obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 1];
mbed_official 337:6ed01c00b962 152 float v = (float)t_on/(float)t_off;
mbed_official 516:b3fb5c6901a6 153 obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 0] = (uint32_t)us;
mbed_official 516:b3fb5c6901a6 154 obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 1] = (uint32_t)((float)us * (float)v);
mbed_official 337:6ed01c00b962 155 }
mbed_official 337:6ed01c00b962 156
mbed_official 337:6ed01c00b962 157 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
mbed_official 337:6ed01c00b962 158 {
mbed_official 337:6ed01c00b962 159 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 337:6ed01c00b962 160 }
mbed_official 337:6ed01c00b962 161
mbed_official 337:6ed01c00b962 162 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
mbed_official 337:6ed01c00b962 163 {
mbed_official 337:6ed01c00b962 164 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 337:6ed01c00b962 165 }
mbed_official 337:6ed01c00b962 166
mbed_official 337:6ed01c00b962 167 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
mbed_official 337:6ed01c00b962 168 {
mbed_official 516:b3fb5c6901a6 169 obj->pwm->MATCHREL[(obj->pwm_ch * 2) + 1] = (uint32_t)us;
mbed_official 337:6ed01c00b962 170 }
mbed_official 337:6ed01c00b962 171
mbed_official 337:6ed01c00b962 172 #endif