ON Semiconductor / mbed-os

5.2.1 - Updated I2C files

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_Freescale/TARGET_KLXX/pwmout_api.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

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group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2006-2013 ARM Limited
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Licensed under the Apache License, Version 2.0 (the "License");
group-onsemi 0:098463de4c5d 5 * you may not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 6 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 9 *
group-onsemi 0:098463de4c5d 10 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 11 * distributed under the License is distributed on an "AS IS" BASIS,
group-onsemi 0:098463de4c5d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 13 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 14 * limitations under the License.
group-onsemi 0:098463de4c5d 15 */
group-onsemi 0:098463de4c5d 16 #include "mbed_assert.h"
group-onsemi 0:098463de4c5d 17 #include "pwmout_api.h"
group-onsemi 0:098463de4c5d 18
group-onsemi 0:098463de4c5d 19 #include "cmsis.h"
group-onsemi 0:098463de4c5d 20 #include "pinmap.h"
group-onsemi 0:098463de4c5d 21 #include "clk_freqs.h"
group-onsemi 0:098463de4c5d 22 #include "PeripheralPins.h"
group-onsemi 0:098463de4c5d 23
group-onsemi 0:098463de4c5d 24 static float pwm_clock;
group-onsemi 0:098463de4c5d 25
group-onsemi 0:098463de4c5d 26 void pwmout_init(pwmout_t* obj, PinName pin) {
group-onsemi 0:098463de4c5d 27 // determine the channel
group-onsemi 0:098463de4c5d 28 PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 29 MBED_ASSERT(pwm != (PWMName)NC);
group-onsemi 0:098463de4c5d 30
group-onsemi 0:098463de4c5d 31 uint32_t clkdiv = 0;
group-onsemi 0:098463de4c5d 32 float clkval;
group-onsemi 0:098463de4c5d 33
group-onsemi 0:098463de4c5d 34 #if defined(TARGET_KL43Z)
group-onsemi 0:098463de4c5d 35 if (mcgirc_frequency()) {
group-onsemi 0:098463de4c5d 36 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(3); // Clock source: MCGIRCLK
group-onsemi 0:098463de4c5d 37 clkval = mcgirc_frequency() / 1000000.0f;
group-onsemi 0:098463de4c5d 38 } else {
group-onsemi 0:098463de4c5d 39 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: IRC48M
group-onsemi 0:098463de4c5d 40 clkval = CPU_INT_IRC_CLK_HZ / 1000000.0f;
group-onsemi 0:098463de4c5d 41 }
group-onsemi 0:098463de4c5d 42 #else
group-onsemi 0:098463de4c5d 43 if (mcgpllfll_frequency()) {
group-onsemi 0:098463de4c5d 44 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK
group-onsemi 0:098463de4c5d 45 clkval = mcgpllfll_frequency() / 1000000.0f;
group-onsemi 0:098463de4c5d 46 } else {
group-onsemi 0:098463de4c5d 47 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(2); // Clock source: ExtOsc
group-onsemi 0:098463de4c5d 48 clkval = extosc_frequency() / 1000000.0f;
group-onsemi 0:098463de4c5d 49 }
group-onsemi 0:098463de4c5d 50 #endif
group-onsemi 0:098463de4c5d 51 while (clkval > 1) {
group-onsemi 0:098463de4c5d 52 clkdiv++;
group-onsemi 0:098463de4c5d 53 clkval /= 2.0;
group-onsemi 0:098463de4c5d 54 if (clkdiv == 7)
group-onsemi 0:098463de4c5d 55 break;
group-onsemi 0:098463de4c5d 56 }
group-onsemi 0:098463de4c5d 57
group-onsemi 0:098463de4c5d 58 pwm_clock = clkval;
group-onsemi 0:098463de4c5d 59 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
group-onsemi 0:098463de4c5d 60 unsigned int tpm_n = (pwm >> TPM_SHIFT);
group-onsemi 0:098463de4c5d 61 unsigned int ch_n = (pwm & 0xFF);
group-onsemi 0:098463de4c5d 62
group-onsemi 0:098463de4c5d 63 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
group-onsemi 0:098463de4c5d 64 SIM->SCGC6 |= 1 << (SIM_SCGC6_TPM0_SHIFT + tpm_n);
group-onsemi 0:098463de4c5d 65
group-onsemi 0:098463de4c5d 66 TPM_Type *tpm = (TPM_Type *)(TPM0_BASE + 0x1000 * tpm_n);
group-onsemi 0:098463de4c5d 67 tpm->SC = TPM_SC_CMOD(1) | TPM_SC_PS(clkdiv); // (clock)MHz / clkdiv ~= (0.75)MHz
group-onsemi 0:098463de4c5d 68 tpm->CONTROLS[ch_n].CnSC = (TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK); /* No Interrupts; High True pulses on Edge Aligned PWM */
group-onsemi 0:098463de4c5d 69
group-onsemi 0:098463de4c5d 70 obj->CnV = &tpm->CONTROLS[ch_n].CnV;
group-onsemi 0:098463de4c5d 71 obj->MOD = &tpm->MOD;
group-onsemi 0:098463de4c5d 72 obj->CNT = &tpm->CNT;
group-onsemi 0:098463de4c5d 73
group-onsemi 0:098463de4c5d 74 // default to 20ms: standard for servos, and fine for e.g. brightness control
group-onsemi 0:098463de4c5d 75 pwmout_period_ms(obj, 20);
group-onsemi 0:098463de4c5d 76 pwmout_write (obj, 0);
group-onsemi 0:098463de4c5d 77
group-onsemi 0:098463de4c5d 78 // Wire pinout
group-onsemi 0:098463de4c5d 79 pinmap_pinout(pin, PinMap_PWM);
group-onsemi 0:098463de4c5d 80 }
group-onsemi 0:098463de4c5d 81
group-onsemi 0:098463de4c5d 82 void pwmout_free(pwmout_t* obj) {}
group-onsemi 0:098463de4c5d 83
group-onsemi 0:098463de4c5d 84 void pwmout_write(pwmout_t* obj, float value) {
group-onsemi 0:098463de4c5d 85 if (value < 0.0) {
group-onsemi 0:098463de4c5d 86 value = 0.0;
group-onsemi 0:098463de4c5d 87 } else if (value > 1.0) {
group-onsemi 0:098463de4c5d 88 value = 1.0;
group-onsemi 0:098463de4c5d 89 }
group-onsemi 0:098463de4c5d 90
group-onsemi 0:098463de4c5d 91 *obj->CnV = (uint32_t)((float)(*obj->MOD + 1) * value);
group-onsemi 0:098463de4c5d 92 *obj->CNT = 0;
group-onsemi 0:098463de4c5d 93 }
group-onsemi 0:098463de4c5d 94
group-onsemi 0:098463de4c5d 95 float pwmout_read(pwmout_t* obj) {
group-onsemi 0:098463de4c5d 96 float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1);
group-onsemi 0:098463de4c5d 97 return (v > 1.0) ? (1.0) : (v);
group-onsemi 0:098463de4c5d 98 }
group-onsemi 0:098463de4c5d 99
group-onsemi 0:098463de4c5d 100 void pwmout_period(pwmout_t* obj, float seconds) {
group-onsemi 0:098463de4c5d 101 pwmout_period_us(obj, seconds * 1000000.0f);
group-onsemi 0:098463de4c5d 102 }
group-onsemi 0:098463de4c5d 103
group-onsemi 0:098463de4c5d 104 void pwmout_period_ms(pwmout_t* obj, int ms) {
group-onsemi 0:098463de4c5d 105 pwmout_period_us(obj, ms * 1000);
group-onsemi 0:098463de4c5d 106 }
group-onsemi 0:098463de4c5d 107
group-onsemi 0:098463de4c5d 108 // Set the PWM period, keeping the duty cycle the same.
group-onsemi 0:098463de4c5d 109 void pwmout_period_us(pwmout_t* obj, int us) {
group-onsemi 0:098463de4c5d 110 float dc = pwmout_read(obj);
group-onsemi 0:098463de4c5d 111 *obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1;
group-onsemi 0:098463de4c5d 112 pwmout_write(obj, dc);
group-onsemi 0:098463de4c5d 113 }
group-onsemi 0:098463de4c5d 114
group-onsemi 0:098463de4c5d 115 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
group-onsemi 0:098463de4c5d 116 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
group-onsemi 0:098463de4c5d 117 }
group-onsemi 0:098463de4c5d 118
group-onsemi 0:098463de4c5d 119 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
group-onsemi 0:098463de4c5d 120 pwmout_pulsewidth_us(obj, ms * 1000);
group-onsemi 0:098463de4c5d 121 }
group-onsemi 0:098463de4c5d 122
group-onsemi 0:098463de4c5d 123 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
group-onsemi 0:098463de4c5d 124 *obj->CnV = (uint32_t)(pwm_clock * (float)us);
group-onsemi 0:098463de4c5d 125 }