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targets/hal/TARGET_Freescale/TARGET_KLXX/pwmout_api.c@636:2405a6d45c2c, 2016-05-23 (annotated)

Committer:
dconsoli
Date:
Mon May 23 02:17:28 2016 +0000
Revision:
636:2405a6d45c2c
Parent:
363:12a245e5c745 
I don't know;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 82:0b31dbcd4769 1 /* mbed Microcontroller Library
mbed_official 82:0b31dbcd4769 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 82:0b31dbcd4769 3 *
mbed_official 82:0b31dbcd4769 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 82:0b31dbcd4769 5 * you may not use this file except in compliance with the License.
mbed_official 82:0b31dbcd4769 6 * You may obtain a copy of the License at
mbed_official 82:0b31dbcd4769 7 *
mbed_official 82:0b31dbcd4769 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 82:0b31dbcd4769 9 *
mbed_official 82:0b31dbcd4769 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 82:0b31dbcd4769 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 82:0b31dbcd4769 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 82:0b31dbcd4769 13 * See the License for the specific language governing permissions and
mbed_official 82:0b31dbcd4769 14 * limitations under the License.
mbed_official 82:0b31dbcd4769 15 */
mbed_official 227:7bd0639b8911 16 #include "mbed_assert.h"
mbed_official 82:0b31dbcd4769 17 #include "pwmout_api.h"
mbed_official 82:0b31dbcd4769 18
mbed_official 82:0b31dbcd4769 19 #include "cmsis.h"
mbed_official 82:0b31dbcd4769 20 #include "pinmap.h"
mbed_official 82:0b31dbcd4769 21 #include "clk_freqs.h"
mbed_official 82:0b31dbcd4769 22 #include "PeripheralPins.h"
mbed_official 82:0b31dbcd4769 23
mbed_official 82:0b31dbcd4769 24 static float pwm_clock;
mbed_official 82:0b31dbcd4769 25
mbed_official 82:0b31dbcd4769 26 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 82:0b31dbcd4769 27 // determine the channel
mbed_official 82:0b31dbcd4769 28 PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 227:7bd0639b8911 29 MBED_ASSERT(pwm != (PWMName)NC);
mbed_official 227:7bd0639b8911 30
mbed_official 82:0b31dbcd4769 31 uint32_t clkdiv = 0;
mbed_official 82:0b31dbcd4769 32 float clkval;
mbed_official 363:12a245e5c745 33
mbed_official 363:12a245e5c745 34 #if defined(TARGET_KL43Z)
mbed_official 363:12a245e5c745 35 if (mcgirc_frequency()) {
mbed_official 363:12a245e5c745 36 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(3); // Clock source: MCGIRCLK
mbed_official 363:12a245e5c745 37 clkval = mcgirc_frequency() / 1000000.0f;
mbed_official 363:12a245e5c745 38 } else {
mbed_official 363:12a245e5c745 39 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: IRC48M
mbed_official 363:12a245e5c745 40 clkval = CPU_INT_IRC_CLK_HZ / 1000000.0f;
mbed_official 363:12a245e5c745 41 }
mbed_official 363:12a245e5c745 42 #else
mbed_official 82:0b31dbcd4769 43 if (mcgpllfll_frequency()) {
mbed_official 82:0b31dbcd4769 44 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK
mbed_official 82:0b31dbcd4769 45 clkval = mcgpllfll_frequency() / 1000000.0f;
mbed_official 82:0b31dbcd4769 46 } else {
mbed_official 82:0b31dbcd4769 47 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(2); // Clock source: ExtOsc
mbed_official 82:0b31dbcd4769 48 clkval = extosc_frequency() / 1000000.0f;
mbed_official 227:7bd0639b8911 49 }
mbed_official 363:12a245e5c745 50 #endif
mbed_official 82:0b31dbcd4769 51 while (clkval > 1) {
mbed_official 82:0b31dbcd4769 52 clkdiv++;
mbed_official 227:7bd0639b8911 53 clkval /= 2.0;
mbed_official 82:0b31dbcd4769 54 if (clkdiv == 7)
mbed_official 82:0b31dbcd4769 55 break;
mbed_official 82:0b31dbcd4769 56 }
mbed_official 82:0b31dbcd4769 57
mbed_official 82:0b31dbcd4769 58 pwm_clock = clkval;
mbed_official 363:12a245e5c745 59 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
mbed_official 82:0b31dbcd4769 60 unsigned int tpm_n = (pwm >> TPM_SHIFT);
mbed_official 363:12a245e5c745 61 unsigned int ch_n = (pwm & 0xFF);
mbed_official 82:0b31dbcd4769 62
mbed_official 82:0b31dbcd4769 63 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 82:0b31dbcd4769 64 SIM->SCGC6 |= 1 << (SIM_SCGC6_TPM0_SHIFT + tpm_n);
mbed_official 82:0b31dbcd4769 65
mbed_official 82:0b31dbcd4769 66 TPM_Type *tpm = (TPM_Type *)(TPM0_BASE + 0x1000 * tpm_n);
mbed_official 82:0b31dbcd4769 67 tpm->SC = TPM_SC_CMOD(1) | TPM_SC_PS(clkdiv); // (clock)MHz / clkdiv ~= (0.75)MHz
mbed_official 82:0b31dbcd4769 68 tpm->CONTROLS[ch_n].CnSC = (TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK); /* No Interrupts; High True pulses on Edge Aligned PWM */
mbed_official 82:0b31dbcd4769 69
mbed_official 82:0b31dbcd4769 70 obj->CnV = &tpm->CONTROLS[ch_n].CnV;
mbed_official 82:0b31dbcd4769 71 obj->MOD = &tpm->MOD;
mbed_official 82:0b31dbcd4769 72 obj->CNT = &tpm->CNT;
mbed_official 82:0b31dbcd4769 73
mbed_official 82:0b31dbcd4769 74 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 82:0b31dbcd4769 75 pwmout_period_ms(obj, 20);
mbed_official 82:0b31dbcd4769 76 pwmout_write (obj, 0);
mbed_official 82:0b31dbcd4769 77
mbed_official 82:0b31dbcd4769 78 // Wire pinout
mbed_official 82:0b31dbcd4769 79 pinmap_pinout(pin, PinMap_PWM);
mbed_official 82:0b31dbcd4769 80 }
mbed_official 82:0b31dbcd4769 81
mbed_official 82:0b31dbcd4769 82 void pwmout_free(pwmout_t* obj) {}
mbed_official 82:0b31dbcd4769 83
mbed_official 82:0b31dbcd4769 84 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 82:0b31dbcd4769 85 if (value < 0.0) {
mbed_official 82:0b31dbcd4769 86 value = 0.0;
mbed_official 82:0b31dbcd4769 87 } else if (value > 1.0) {
mbed_official 82:0b31dbcd4769 88 value = 1.0;
mbed_official 82:0b31dbcd4769 89 }
mbed_official 82:0b31dbcd4769 90
mbed_official 264:91fcbf887208 91 *obj->CnV = (uint32_t)((float)(*obj->MOD + 1) * value);
mbed_official 82:0b31dbcd4769 92 *obj->CNT = 0;
mbed_official 82:0b31dbcd4769 93 }
mbed_official 82:0b31dbcd4769 94
mbed_official 82:0b31dbcd4769 95 float pwmout_read(pwmout_t* obj) {
mbed_official 264:91fcbf887208 96 float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1);
mbed_official 82:0b31dbcd4769 97 return (v > 1.0) ? (1.0) : (v);
mbed_official 82:0b31dbcd4769 98 }
mbed_official 82:0b31dbcd4769 99
mbed_official 82:0b31dbcd4769 100 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 82:0b31dbcd4769 101 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 82:0b31dbcd4769 102 }
mbed_official 82:0b31dbcd4769 103
mbed_official 82:0b31dbcd4769 104 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 82:0b31dbcd4769 105 pwmout_period_us(obj, ms * 1000);
mbed_official 82:0b31dbcd4769 106 }
mbed_official 82:0b31dbcd4769 107
mbed_official 82:0b31dbcd4769 108 // Set the PWM period, keeping the duty cycle the same.
mbed_official 82:0b31dbcd4769 109 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 82:0b31dbcd4769 110 float dc = pwmout_read(obj);
mbed_official 264:91fcbf887208 111 *obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1;
mbed_official 82:0b31dbcd4769 112 pwmout_write(obj, dc);
mbed_official 82:0b31dbcd4769 113 }
mbed_official 82:0b31dbcd4769 114
mbed_official 82:0b31dbcd4769 115 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 82:0b31dbcd4769 116 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 82:0b31dbcd4769 117 }
mbed_official 82:0b31dbcd4769 118
mbed_official 82:0b31dbcd4769 119 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 82:0b31dbcd4769 120 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 82:0b31dbcd4769 121 }
mbed_official 82:0b31dbcd4769 122
mbed_official 82:0b31dbcd4769 123 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 82:0b31dbcd4769 124 *obj->CnV = (uint32_t)(pwm_clock * (float)us);
mbed_official 82:0b31dbcd4769 125 }