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mbed SDK library sources

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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_Freescale/TARGET_K20D5M/pwmout_api.c@68:41613245dfd7, 2013-12-26 (annotated)

Committer:
mbed_official
Date:
Thu Dec 26 13:00:06 2013 +0000
Revision:
68:41613245dfd7
Child:
73:299c67215126
Synchronized with git revision fba199a9c4445231b0f38e1e113c118182635546



Full URL: https://github.com/mbedmicro/mbed/commit/fba199a9c4445231b0f38e1e113c118182635546/



target K20D5M

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 68:41613245dfd7 1 /* mbed Microcontroller Library
mbed_official 68:41613245dfd7 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 68:41613245dfd7 3 *
mbed_official 68:41613245dfd7 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 68:41613245dfd7 5 * you may not use this file except in compliance with the License.
mbed_official 68:41613245dfd7 6 * You may obtain a copy of the License at
mbed_official 68:41613245dfd7 7 *
mbed_official 68:41613245dfd7 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 68:41613245dfd7 9 *
mbed_official 68:41613245dfd7 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 68:41613245dfd7 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 68:41613245dfd7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 68:41613245dfd7 13 * See the License for the specific language governing permissions and
mbed_official 68:41613245dfd7 14 * limitations under the License.
mbed_official 68:41613245dfd7 15 */
mbed_official 68:41613245dfd7 16 #include "pwmout_api.h"
mbed_official 68:41613245dfd7 17
mbed_official 68:41613245dfd7 18 #include "cmsis.h"
mbed_official 68:41613245dfd7 19 #include "pinmap.h"
mbed_official 68:41613245dfd7 20 #include "error.h"
mbed_official 68:41613245dfd7 21
mbed_official 68:41613245dfd7 22 static const PinMap PinMap_PWM[] = {
mbed_official 68:41613245dfd7 23 // LEDs
mbed_official 68:41613245dfd7 24 {LED_RED , PWM_3 , 3}, // PTC3, FTM0 CH2
mbed_official 68:41613245dfd7 25 {LED_GREEN, PWM_5, 3}, // PTD4, FTM0 CH4
mbed_official 68:41613245dfd7 26 {LED_BLUE , PWM_9 , 3}, // PTA2 , FTM0 CH7
mbed_official 68:41613245dfd7 27
mbed_official 68:41613245dfd7 28 // Arduino digital pinout
mbed_official 68:41613245dfd7 29 {D3, PWM_5 , 3}, // PTD4, FTM0 CH4
mbed_official 68:41613245dfd7 30 {D5, PWM_7 , 3}, // PTA1 , FTM0 CH6
mbed_official 68:41613245dfd7 31 {D6, PWM_3 , 3}, // PTC3 , FTM0 CH2
mbed_official 68:41613245dfd7 32 {D9, PWM_8 , 4}, // PTD2 , FTM0 CH7
mbed_official 68:41613245dfd7 33 {D10, PWM_2 , 4}, // PTC2 , FTM0 CH1
mbed_official 68:41613245dfd7 34
mbed_official 68:41613245dfd7 35 {NC , NC , 0}
mbed_official 68:41613245dfd7 36 };
mbed_official 68:41613245dfd7 37
mbed_official 68:41613245dfd7 38 #define PWM_CLOCK_MHZ (0.75) // (48)MHz / 64 = (0.75)MHz
mbed_official 68:41613245dfd7 39
mbed_official 68:41613245dfd7 40 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 68:41613245dfd7 41 // determine the channel
mbed_official 68:41613245dfd7 42 PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 68:41613245dfd7 43 if (pwm == (PWMName)NC)
mbed_official 68:41613245dfd7 44 error("PwmOut pin mapping failed");
mbed_official 68:41613245dfd7 45
mbed_official 68:41613245dfd7 46 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
mbed_official 68:41613245dfd7 47 unsigned int ftm_n = (pwm >> TPM_SHIFT);
mbed_official 68:41613245dfd7 48 unsigned int ch_n = (pwm & 0xFF);
mbed_official 68:41613245dfd7 49
mbed_official 68:41613245dfd7 50 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 68:41613245dfd7 51 SIM->SCGC6 |= 1 << (SIM_SCGC6_FTM0_SHIFT + ftm_n);
mbed_official 68:41613245dfd7 52
mbed_official 68:41613245dfd7 53 FTM_Type *ftm = (FTM_Type *)(FTM0_BASE + 0x1000 * ftm_n);
mbed_official 68:41613245dfd7 54 ftm->MODE |= FTM_MODE_WPDIS_MASK; //write protection disabled
mbed_official 68:41613245dfd7 55 ftm->CONF |= FTM_CONF_BDMMODE(3);
mbed_official 68:41613245dfd7 56 ftm->SC = FTM_SC_CLKS(1) | FTM_SC_PS(6); // (48)MHz / 64 = (0.75)MHz
mbed_official 68:41613245dfd7 57 ftm->CONTROLS[ch_n].CnSC = (FTM_CnSC_MSB_MASK | FTM_CnSC_ELSB_MASK); /* No Interrupts; High True pulses on Edge Aligned PWM */
mbed_official 68:41613245dfd7 58 ftm->PWMLOAD |= FTM_PWMLOAD_LDOK_MASK; //loading updated values enabled
mbed_official 68:41613245dfd7 59 //ftm->SYNCONF |= FTM_SYNCONF_SWRSTCNT_MASK;
mbed_official 68:41613245dfd7 60 ftm->MODE |= FTM_MODE_INIT_MASK;
mbed_official 68:41613245dfd7 61
mbed_official 68:41613245dfd7 62 obj->CnV = &ftm->CONTROLS[ch_n].CnV;
mbed_official 68:41613245dfd7 63 obj->MOD = &ftm->MOD;
mbed_official 68:41613245dfd7 64 obj->CNT = &ftm->CNT;
mbed_official 68:41613245dfd7 65 obj->SYNC = &ftm->SYNC;
mbed_official 68:41613245dfd7 66
mbed_official 68:41613245dfd7 67 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 68:41613245dfd7 68 pwmout_period_ms(obj, 20);
mbed_official 68:41613245dfd7 69 pwmout_write (obj, 0);
mbed_official 68:41613245dfd7 70
mbed_official 68:41613245dfd7 71 // Wire pinout
mbed_official 68:41613245dfd7 72 pinmap_pinout(pin, PinMap_PWM);
mbed_official 68:41613245dfd7 73 }
mbed_official 68:41613245dfd7 74
mbed_official 68:41613245dfd7 75 void pwmout_free(pwmout_t* obj) {}
mbed_official 68:41613245dfd7 76
mbed_official 68:41613245dfd7 77 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 68:41613245dfd7 78 if (value < 0.0) {
mbed_official 68:41613245dfd7 79 value = 0.0;
mbed_official 68:41613245dfd7 80 } else if (value > 1.0) {
mbed_official 68:41613245dfd7 81 value = 1.0;
mbed_official 68:41613245dfd7 82 }
mbed_official 68:41613245dfd7 83
mbed_official 68:41613245dfd7 84 *obj->CnV = (uint32_t)((float)(*obj->MOD) * value);
mbed_official 68:41613245dfd7 85 *obj->CNT = 0;
mbed_official 68:41613245dfd7 86 //*obj->SYNC |= FTM_SYNC_SWSYNC_MASK;
mbed_official 68:41613245dfd7 87 }
mbed_official 68:41613245dfd7 88
mbed_official 68:41613245dfd7 89 float pwmout_read(pwmout_t* obj) {
mbed_official 68:41613245dfd7 90 float v = (float)(*obj->CnV) / (float)(*obj->MOD);
mbed_official 68:41613245dfd7 91 return (v > 1.0) ? (1.0) : (v);
mbed_official 68:41613245dfd7 92 }
mbed_official 68:41613245dfd7 93
mbed_official 68:41613245dfd7 94 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 68:41613245dfd7 95 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 68:41613245dfd7 96 }
mbed_official 68:41613245dfd7 97
mbed_official 68:41613245dfd7 98 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 68:41613245dfd7 99 pwmout_period_us(obj, ms * 1000);
mbed_official 68:41613245dfd7 100 }
mbed_official 68:41613245dfd7 101
mbed_official 68:41613245dfd7 102 // Set the PWM period, keeping the duty cycle the same.
mbed_official 68:41613245dfd7 103 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 68:41613245dfd7 104 float dc = pwmout_read(obj);
mbed_official 68:41613245dfd7 105 *obj->MOD = PWM_CLOCK_MHZ * us;
mbed_official 68:41613245dfd7 106 pwmout_write(obj, dc);
mbed_official 68:41613245dfd7 107 }
mbed_official 68:41613245dfd7 108
mbed_official 68:41613245dfd7 109 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 68:41613245dfd7 110 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 68:41613245dfd7 111 }
mbed_official 68:41613245dfd7 112
mbed_official 68:41613245dfd7 113 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 68:41613245dfd7 114 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 68:41613245dfd7 115 }
mbed_official 68:41613245dfd7 116
mbed_official 68:41613245dfd7 117 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 68:41613245dfd7 118 *obj->CnV = PWM_CLOCK_MHZ * us;
mbed_official 68:41613245dfd7 119 }