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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.

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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_KL46Z/pwmout_api.c@33:e214068ab66c, 2013-10-07 (annotated)

Committer:
mbed_official
Date:
Mon Oct 07 09:15:08 2013 +0100
Revision:
33:e214068ab66c
Parent:
31:42176bc3c368 
Synchronized with git revision 53edc82f7373bbfa01a161700524765f52fdb444

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 31:42176bc3c368 1 /* mbed Microcontroller Library
mbed_official 31:42176bc3c368 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 31:42176bc3c368 3 *
mbed_official 31:42176bc3c368 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 31:42176bc3c368 5 * you may not use this file except in compliance with the License.
mbed_official 31:42176bc3c368 6 * You may obtain a copy of the License at
mbed_official 31:42176bc3c368 7 *
mbed_official 31:42176bc3c368 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 31:42176bc3c368 9 *
mbed_official 31:42176bc3c368 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 31:42176bc3c368 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 31:42176bc3c368 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 31:42176bc3c368 13 * See the License for the specific language governing permissions and
mbed_official 31:42176bc3c368 14 * limitations under the License.
mbed_official 31:42176bc3c368 15 */
mbed_official 31:42176bc3c368 16 #include "pwmout_api.h"
mbed_official 31:42176bc3c368 17
mbed_official 31:42176bc3c368 18 #include "cmsis.h"
mbed_official 31:42176bc3c368 19 #include "pinmap.h"
mbed_official 31:42176bc3c368 20 #include "error.h"
mbed_official 31:42176bc3c368 21
mbed_official 31:42176bc3c368 22 static const PinMap PinMap_PWM[] = {
mbed_official 33:e214068ab66c 23 // LEDs - only RED pin is PWM capable
mbed_official 33:e214068ab66c 24 {LED_RED, PWM_3, 3}, // PTE29, TPM0 CH2
mbed_official 31:42176bc3c368 25
mbed_official 31:42176bc3c368 26 // Arduino digital pinout
mbed_official 31:42176bc3c368 27 {D0, PWM_9 , 3}, // PTA1 , TPM2 CH0
mbed_official 31:42176bc3c368 28 {D1, PWM_10, 3}, // PTA2 , TPM2 CH1
mbed_official 33:e214068ab66c 29 {D2, PWM_4 , 4}, // PTD3 , TPM0 CH3
mbed_official 31:42176bc3c368 30 {D3, PWM_7 , 3}, // PTA12, TPM1 CH0
mbed_official 31:42176bc3c368 31 {D4, PWM_2 , 3}, // PTA4 , TPM0 CH1
mbed_official 31:42176bc3c368 32 {D5, PWM_3 , 3}, // PTA5 , TPM0 CH2
mbed_official 31:42176bc3c368 33 {D6, PWM_5 , 3}, // PTC8 , TPM0 CH4
mbed_official 31:42176bc3c368 34 {D7, PWM_6 , 3}, // PTC9 , TPM0 CH5
mbed_official 31:42176bc3c368 35 {D8, PWM_8 , 3}, // PTA13, TPM1 CH1
mbed_official 33:e214068ab66c 36 {D9, PWM_3 , 4}, // PTD2 , TPM0 CH2
mbed_official 33:e214068ab66c 37 {D10, PWM_5 , 4}, // PTD4 , TPM0 CH4
mbed_official 33:e214068ab66c 38 //PWM on D11 not available
mbed_official 33:e214068ab66c 39 //PWM on D12 not available
mbed_official 33:e214068ab66c 40 {D13, PWM_2 , 4}, // PTD5 , TPM0 CH1,
mbed_official 31:42176bc3c368 41
mbed_official 31:42176bc3c368 42 {PTA0, PWM_6, 3},
mbed_official 31:42176bc3c368 43 {PTA3, PWM_1, 3},
mbed_official 33:e214068ab66c 44 {PTA6, PWM_4, 3},
mbed_official 33:e214068ab66c 45 {PTA7, PWM_5, 3},
mbed_official 31:42176bc3c368 46 {PTB0, PWM_7, 3},
mbed_official 31:42176bc3c368 47 {PTB1, PWM_8, 3},
mbed_official 31:42176bc3c368 48 {PTB2, PWM_9, 3},
mbed_official 31:42176bc3c368 49 {PTB3, PWM_10, 3},
mbed_official 31:42176bc3c368 50 {PTC1, PWM_1, 4},
mbed_official 31:42176bc3c368 51 {PTC2, PWM_2, 4},
mbed_official 31:42176bc3c368 52 {PTC3, PWM_3, 4},
mbed_official 31:42176bc3c368 53 {PTC4, PWM_4, 4},
mbed_official 31:42176bc3c368 54 {PTE20, PWM_7, 3},
mbed_official 31:42176bc3c368 55 {PTE21, PWM_8, 3},
mbed_official 31:42176bc3c368 56 {PTE22, PWM_9, 3},
mbed_official 31:42176bc3c368 57 {PTE23, PWM_10, 3},
mbed_official 31:42176bc3c368 58 {PTE24, PWM_1, 3},
mbed_official 31:42176bc3c368 59 {PTE25, PWM_2, 3},
mbed_official 33:e214068ab66c 60 {PTE26, PWM_6, 3},
mbed_official 31:42176bc3c368 61 {PTE29, PWM_3, 3},
mbed_official 31:42176bc3c368 62 {PTE30, PWM_4, 3},
mbed_official 31:42176bc3c368 63 {PTE31, PWM_5, 3},
mbed_official 31:42176bc3c368 64
mbed_official 31:42176bc3c368 65 {NC , NC , 0}
mbed_official 31:42176bc3c368 66 };
mbed_official 31:42176bc3c368 67
mbed_official 31:42176bc3c368 68 #define PWM_CLOCK_MHZ (0.75) // (48)MHz / 64 = (0.75)MHz
mbed_official 31:42176bc3c368 69
mbed_official 31:42176bc3c368 70 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 31:42176bc3c368 71 // determine the channel
mbed_official 31:42176bc3c368 72 PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 31:42176bc3c368 73 if (pwm == (PWMName)NC)
mbed_official 31:42176bc3c368 74 error("PwmOut pin mapping failed");
mbed_official 31:42176bc3c368 75
mbed_official 31:42176bc3c368 76 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
mbed_official 31:42176bc3c368 77 unsigned int tpm_n = (pwm >> TPM_SHIFT);
mbed_official 31:42176bc3c368 78 unsigned int ch_n = (pwm & 0xFF);
mbed_official 31:42176bc3c368 79
mbed_official 31:42176bc3c368 80 SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
mbed_official 31:42176bc3c368 81 SIM->SCGC6 |= 1 << (SIM_SCGC6_TPM0_SHIFT + tpm_n);
mbed_official 31:42176bc3c368 82 SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK
mbed_official 31:42176bc3c368 83
mbed_official 31:42176bc3c368 84 TPM_Type *tpm = (TPM_Type *)(TPM0_BASE + 0x1000 * tpm_n);
mbed_official 31:42176bc3c368 85 tpm->SC = TPM_SC_CMOD(1) | TPM_SC_PS(6); // (48)MHz / 64 = (0.75)MHz
mbed_official 31:42176bc3c368 86 tpm->CONTROLS[ch_n].CnSC = (TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK); /* No Interrupts; High True pulses on Edge Aligned PWM */
mbed_official 31:42176bc3c368 87
mbed_official 31:42176bc3c368 88 obj->CnV = &tpm->CONTROLS[ch_n].CnV;
mbed_official 31:42176bc3c368 89 obj->MOD = &tpm->MOD;
mbed_official 31:42176bc3c368 90 obj->CNT = &tpm->CNT;
mbed_official 31:42176bc3c368 91
mbed_official 31:42176bc3c368 92 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 31:42176bc3c368 93 pwmout_period_ms(obj, 20);
mbed_official 31:42176bc3c368 94 pwmout_write (obj, 0);
mbed_official 31:42176bc3c368 95
mbed_official 31:42176bc3c368 96 // Wire pinout
mbed_official 31:42176bc3c368 97 pinmap_pinout(pin, PinMap_PWM);
mbed_official 31:42176bc3c368 98 }
mbed_official 31:42176bc3c368 99
mbed_official 31:42176bc3c368 100 void pwmout_free(pwmout_t* obj) {}
mbed_official 31:42176bc3c368 101
mbed_official 31:42176bc3c368 102 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 31:42176bc3c368 103 if (value < 0.0) {
mbed_official 31:42176bc3c368 104 value = 0.0;
mbed_official 31:42176bc3c368 105 } else if (value > 1.0) {
mbed_official 31:42176bc3c368 106 value = 1.0;
mbed_official 31:42176bc3c368 107 }
mbed_official 31:42176bc3c368 108
mbed_official 31:42176bc3c368 109 *obj->CnV = (uint32_t)((float)(*obj->MOD) * value);
mbed_official 31:42176bc3c368 110 *obj->CNT = 0;
mbed_official 31:42176bc3c368 111 }
mbed_official 31:42176bc3c368 112
mbed_official 31:42176bc3c368 113 float pwmout_read(pwmout_t* obj) {
mbed_official 31:42176bc3c368 114 float v = (float)(*obj->CnV) / (float)(*obj->MOD);
mbed_official 31:42176bc3c368 115 return (v > 1.0) ? (1.0) : (v);
mbed_official 31:42176bc3c368 116 }
mbed_official 31:42176bc3c368 117
mbed_official 31:42176bc3c368 118 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 31:42176bc3c368 119 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 31:42176bc3c368 120 }
mbed_official 31:42176bc3c368 121
mbed_official 31:42176bc3c368 122 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 31:42176bc3c368 123 pwmout_period_us(obj, ms * 1000);
mbed_official 31:42176bc3c368 124 }
mbed_official 31:42176bc3c368 125
mbed_official 31:42176bc3c368 126 // Set the PWM period, keeping the duty cycle the same.
mbed_official 31:42176bc3c368 127 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 31:42176bc3c368 128 float dc = pwmout_read(obj);
mbed_official 31:42176bc3c368 129 *obj->MOD = PWM_CLOCK_MHZ * us;
mbed_official 31:42176bc3c368 130 pwmout_write(obj, dc);
mbed_official 31:42176bc3c368 131 }
mbed_official 31:42176bc3c368 132
mbed_official 31:42176bc3c368 133 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 31:42176bc3c368 134 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 31:42176bc3c368 135 }
mbed_official 31:42176bc3c368 136
mbed_official 31:42176bc3c368 137 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 31:42176bc3c368 138 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 31:42176bc3c368 139 }
mbed_official 31:42176bc3c368 140
mbed_official 31:42176bc3c368 141 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 31:42176bc3c368 142 *obj->CnV = PWM_CLOCK_MHZ * us;
mbed_official 31:42176bc3c368 143 }