Janek Mann / mbed-src-openwear

mbed library sources modified for open wear

Dependents:   openwear-lifelogger-example

Fork of mbed-src by mbed official

targets/hal/TARGET_Freescale/TARGET_KPSDK_MCUS/TARGET_K64F/pwmout_api.c@267:8673334f2cbe, 2014-07-29 (annotated)

Committer:
mbed_official
Date:
Tue Jul 29 18:45:06 2014 +0100
Revision:
267:8673334f2cbe
Parent:
265:9632ea190e16 
Synchronized with git revision 1d586e1f8df5e4ff9eb4b8420095fd3f74426163



Full URL: https://github.com/mbedmicro/mbed/commit/1d586e1f8df5e4ff9eb4b8420095fd3f74426163/



Had duplicate set of api drivers in the directory - deleted

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 146:f64d43ff0c18 1 /* mbed Microcontroller Library
mbed_official 146:f64d43ff0c18 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 146:f64d43ff0c18 3 *
mbed_official 146:f64d43ff0c18 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 146:f64d43ff0c18 5 * you may not use this file except in compliance with the License.
mbed_official 146:f64d43ff0c18 6 * You may obtain a copy of the License at
mbed_official 146:f64d43ff0c18 7 *
mbed_official 146:f64d43ff0c18 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 146:f64d43ff0c18 9 *
mbed_official 146:f64d43ff0c18 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 146:f64d43ff0c18 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 146:f64d43ff0c18 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 146:f64d43ff0c18 13 * See the License for the specific language governing permissions and
mbed_official 146:f64d43ff0c18 14 * limitations under the License.
mbed_official 146:f64d43ff0c18 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 146:f64d43ff0c18 17 #include "pwmout_api.h"
mbed_official 146:f64d43ff0c18 18
mbed_official 267:8673334f2cbe 19 #if DEVICE_PWMOUT
mbed_official 267:8673334f2cbe 20
mbed_official 146:f64d43ff0c18 21 #include "cmsis.h"
mbed_official 146:f64d43ff0c18 22 #include "pinmap.h"
mbed_official 146:f64d43ff0c18 23 #include "fsl_ftm_hal.h"
mbed_official 146:f64d43ff0c18 24 #include "fsl_mcg_hal.h"
mbed_official 146:f64d43ff0c18 25 #include "fsl_clock_manager.h"
mbed_official 265:9632ea190e16 26 #include "PeripheralPins.h"
mbed_official 146:f64d43ff0c18 27
mbed_official 152:3248c4875353 28 static float pwm_clock_mhz;
mbed_official 146:f64d43ff0c18 29
mbed_official 146:f64d43ff0c18 30 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 146:f64d43ff0c18 31 PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 227:7bd0639b8911 32 MBED_ASSERT(pwm != (PWMName)NC);
mbed_official 227:7bd0639b8911 33
mbed_official 146:f64d43ff0c18 34 obj->pwm_name = pwm;
mbed_official 146:f64d43ff0c18 35
mbed_official 152:3248c4875353 36 uint32_t pwm_base_clock;
mbed_official 152:3248c4875353 37 clock_manager_get_frequency(kBusClock, &pwm_base_clock);
mbed_official 152:3248c4875353 38 float clkval = (float)pwm_base_clock / 1000000.0f;
mbed_official 146:f64d43ff0c18 39 uint32_t clkdiv = 0;
mbed_official 146:f64d43ff0c18 40 while (clkval > 1) {
mbed_official 146:f64d43ff0c18 41 clkdiv++;
mbed_official 146:f64d43ff0c18 42 clkval /= 2.0f;
mbed_official 146:f64d43ff0c18 43 if (clkdiv == 7) {
mbed_official 146:f64d43ff0c18 44 break;
mbed_official 146:f64d43ff0c18 45 }
mbed_official 146:f64d43ff0c18 46 }
mbed_official 150:49699a7d7064 47
mbed_official 152:3248c4875353 48 pwm_clock_mhz = clkval;
mbed_official 146:f64d43ff0c18 49 uint32_t channel = pwm & 0xF;
mbed_official 146:f64d43ff0c18 50 uint32_t instance = pwm >> TPM_SHIFT;
mbed_official 146:f64d43ff0c18 51 clock_manager_set_gate(kClockModuleFTM, instance, true);
mbed_official 150:49699a7d7064 52 ftm_hal_set_tof_frequency(instance, 3);
mbed_official 152:3248c4875353 53 ftm_hal_set_clock_source(instance, kClock_source_FTM_SystemClk);
mbed_official 146:f64d43ff0c18 54 ftm_hal_set_clock_ps(instance, (ftm_clock_ps_t)clkdiv);
mbed_official 152:3248c4875353 55 ftm_hal_set_counter_init_val(instance, 0);
mbed_official 146:f64d43ff0c18 56 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 146:f64d43ff0c18 57 pwmout_period_ms(obj, 20);
mbed_official 146:f64d43ff0c18 58 pwmout_write (obj, 0);
mbed_official 152:3248c4875353 59 ftm_config_t config = {
mbed_official 152:3248c4875353 60 .mode = kFtmEdgeAlignedPWM,
mbed_official 152:3248c4875353 61 .channel = channel,
mbed_official 152:3248c4875353 62 .edge_mode = {.ftm_pwm_edge_mode = kFtmHighTrue}
mbed_official 152:3248c4875353 63 };
mbed_official 152:3248c4875353 64 ftm_hal_enable_pwm_mode(instance, &config);
mbed_official 146:f64d43ff0c18 65
mbed_official 146:f64d43ff0c18 66 // Wire pinout
mbed_official 146:f64d43ff0c18 67 pinmap_pinout(pin, PinMap_PWM);
mbed_official 146:f64d43ff0c18 68 }
mbed_official 146:f64d43ff0c18 69
mbed_official 146:f64d43ff0c18 70 void pwmout_free(pwmout_t* obj) {
mbed_official 146:f64d43ff0c18 71 }
mbed_official 146:f64d43ff0c18 72
mbed_official 146:f64d43ff0c18 73 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 153:a2bd7206fd97 74 uint32_t instance = obj->pwm_name >> TPM_SHIFT;
mbed_official 146:f64d43ff0c18 75 if (value < 0.0f) {
mbed_official 146:f64d43ff0c18 76 value = 0.0f;
mbed_official 146:f64d43ff0c18 77 } else if (value > 1.0f) {
mbed_official 146:f64d43ff0c18 78 value = 1.0f;
mbed_official 146:f64d43ff0c18 79 }
mbed_official 153:a2bd7206fd97 80 uint16_t mod = ftm_hal_get_mod(instance);
mbed_official 146:f64d43ff0c18 81 uint32_t new_count = (uint32_t)((float)(mod) * value);
mbed_official 153:a2bd7206fd97 82 // Stop FTM clock to ensure instant update of MOD register
mbed_official 153:a2bd7206fd97 83 ftm_hal_set_clock_source(instance, kClock_source_FTM_None);
mbed_official 153:a2bd7206fd97 84 ftm_hal_set_channel_count_value(instance, obj->pwm_name & 0xF, new_count);
mbed_official 153:a2bd7206fd97 85 ftm_hal_set_counter(instance, 0);
mbed_official 153:a2bd7206fd97 86 ftm_hal_set_clock_source(instance, kClock_source_FTM_SystemClk);
mbed_official 146:f64d43ff0c18 87 }
mbed_official 146:f64d43ff0c18 88
mbed_official 146:f64d43ff0c18 89 float pwmout_read(pwmout_t* obj) {
mbed_official 146:f64d43ff0c18 90 uint16_t count = ftm_hal_get_channel_count_value(obj->pwm_name >> TPM_SHIFT, obj->pwm_name & 0xF, 0);
mbed_official 146:f64d43ff0c18 91 uint16_t mod = ftm_hal_get_mod(obj->pwm_name >> TPM_SHIFT);
mbed_official 152:3248c4875353 92 if (mod == 0)
mbed_official 152:3248c4875353 93 return 0.0;
mbed_official 146:f64d43ff0c18 94 float v = (float)(count) / (float)(mod);
mbed_official 146:f64d43ff0c18 95 return (v > 1.0f) ? (1.0f) : (v);
mbed_official 146:f64d43ff0c18 96 }
mbed_official 146:f64d43ff0c18 97
mbed_official 146:f64d43ff0c18 98 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 146:f64d43ff0c18 99 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 146:f64d43ff0c18 100 }
mbed_official 146:f64d43ff0c18 101
mbed_official 146:f64d43ff0c18 102 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 146:f64d43ff0c18 103 pwmout_period_us(obj, ms * 1000);
mbed_official 146:f64d43ff0c18 104 }
mbed_official 146:f64d43ff0c18 105
mbed_official 146:f64d43ff0c18 106 // Set the PWM period, keeping the duty cycle the same.
mbed_official 146:f64d43ff0c18 107 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 152:3248c4875353 108 uint32_t instance = obj->pwm_name >> TPM_SHIFT;
mbed_official 146:f64d43ff0c18 109 float dc = pwmout_read(obj);
mbed_official 152:3248c4875353 110 // Stop FTM clock to ensure instant update of MOD register
mbed_official 152:3248c4875353 111 ftm_hal_set_clock_source(instance, kClock_source_FTM_None);
mbed_official 152:3248c4875353 112 ftm_hal_set_mod(instance, (uint32_t)(pwm_clock_mhz * (float)us) - 1);
mbed_official 146:f64d43ff0c18 113 pwmout_write(obj, dc);
mbed_official 152:3248c4875353 114 ftm_hal_set_clock_source(instance, kClock_source_FTM_SystemClk);
mbed_official 146:f64d43ff0c18 115 }
mbed_official 146:f64d43ff0c18 116
mbed_official 146:f64d43ff0c18 117 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 146:f64d43ff0c18 118 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 146:f64d43ff0c18 119 }
mbed_official 146:f64d43ff0c18 120
mbed_official 146:f64d43ff0c18 121 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 146:f64d43ff0c18 122 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 146:f64d43ff0c18 123 }
mbed_official 146:f64d43ff0c18 124
mbed_official 146:f64d43ff0c18 125 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 152:3248c4875353 126 uint32_t value = (uint32_t)(pwm_clock_mhz * (float)us);
mbed_official 146:f64d43ff0c18 127 ftm_hal_set_channel_count_value(obj->pwm_name >> TPM_SHIFT, obj->pwm_name & 0xF, value);
mbed_official 146:f64d43ff0c18 128 }
mbed_official 267:8673334f2cbe 129
mbed_official 267:8673334f2cbe 130 #endif