mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/hal/TARGET_Freescale/TARGET_K20D50M/pwmout_api.c@323:9e901b0a5aa1, 2014-09-13 (annotated)
- Committer:
- shaoziyang
- Date:
- Sat Sep 13 14:25:46 2014 +0000
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 264:91fcbf887208
test with CLOCK_SETUP = 0
Who changed what in which revision?
User | Revision | Line number | New 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 | 227:7bd0639b8911 | 16 | #include "mbed_assert.h" |
mbed_official | 68:41613245dfd7 | 17 | #include "pwmout_api.h" |
mbed_official | 68:41613245dfd7 | 18 | |
mbed_official | 68:41613245dfd7 | 19 | #include "cmsis.h" |
mbed_official | 68:41613245dfd7 | 20 | #include "pinmap.h" |
mbed_official | 68:41613245dfd7 | 21 | |
mbed_official | 68:41613245dfd7 | 22 | static const PinMap PinMap_PWM[] = { |
mbed_official | 68:41613245dfd7 | 23 | // LEDs |
mbed_official | 73:299c67215126 | 24 | {LED_RED , PWM_3 , 4}, // PTC3, FTM0 CH2 |
mbed_official | 73:299c67215126 | 25 | {LED_GREEN, PWM_5, 4}, // PTD4, FTM0 CH4 |
mbed_official | 73:299c67215126 | 26 | {LED_BLUE , PWM_8 , 3}, // PTA2, FTM0 CH7 |
mbed_official | 68:41613245dfd7 | 27 | |
mbed_official | 68:41613245dfd7 | 28 | // Arduino digital pinout |
mbed_official | 73:299c67215126 | 29 | {D3, PWM_5 , 4}, // PTD4, FTM0 CH4 |
mbed_official | 73:299c67215126 | 30 | {D5, PWM_7 , 3}, // PTA1, FTM0 CH6 |
mbed_official | 73:299c67215126 | 31 | {D6, PWM_3 , 4}, // PTC3, FTM0 CH2 |
mbed_official | 73:299c67215126 | 32 | {D9, PWM_6 , 4}, // PTD5, FTM0 CH6 |
mbed_official | 73:299c67215126 | 33 | {D10, PWM_2 , 4}, // PTC2, FTM0 CH1 |
mbed_official | 73:299c67215126 | 34 | |
mbed_official | 73:299c67215126 | 35 | {PTA0, PWM_6 , 3}, // PTA0, FTM0 CH5 |
mbed_official | 73:299c67215126 | 36 | {PTA3, PWM_1 , 3}, // PTA3, FTM0 CH0 |
mbed_official | 73:299c67215126 | 37 | {PTA4, PWM_2 , 3}, // PTA4, FTM0 CH1 |
mbed_official | 73:299c67215126 | 38 | {PTA5, PWM_3 , 3}, // PTA5, FTM0 CH2 |
mbed_official | 73:299c67215126 | 39 | {PTA12, PWM_9 , 3}, // PTA12, FTM1 CH0 |
mbed_official | 73:299c67215126 | 40 | {PTA13, PWM_10, 3}, // PTA13, FTM1 CH1 |
mbed_official | 73:299c67215126 | 41 | {PTB0, PWM_9 , 3}, // PTB0, FTM1 CH0 |
mbed_official | 73:299c67215126 | 42 | {PTB1, PWM_10, 3}, // PTB1, FTM1 CH1 |
mbed_official | 73:299c67215126 | 43 | {PTC1, PWM_1 , 4}, // PTC1, FTM0 CH0 |
mbed_official | 73:299c67215126 | 44 | {PTD4, PWM_4 , 4}, // PTD4, FTM0 CH3 |
mbed_official | 73:299c67215126 | 45 | {PTD6, PWM_7 , 4}, // PTD6, FTM0 CH6 |
mbed_official | 73:299c67215126 | 46 | {PTD7, PWM_8 , 4}, // PTD7, FTM0 CH7 |
mbed_official | 68:41613245dfd7 | 47 | |
mbed_official | 68:41613245dfd7 | 48 | {NC , NC , 0} |
mbed_official | 68:41613245dfd7 | 49 | }; |
mbed_official | 68:41613245dfd7 | 50 | |
mbed_official | 73:299c67215126 | 51 | static float pwm_clock = 0; |
mbed_official | 68:41613245dfd7 | 52 | |
mbed_official | 68:41613245dfd7 | 53 | void pwmout_init(pwmout_t* obj, PinName pin) { |
mbed_official | 68:41613245dfd7 | 54 | // determine the channel |
mbed_official | 68:41613245dfd7 | 55 | PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM); |
mbed_official | 227:7bd0639b8911 | 56 | MBED_ASSERT(pwm != (PWMName)NC); |
mbed_official | 68:41613245dfd7 | 57 | |
mbed_official | 73:299c67215126 | 58 | uint32_t clkdiv = 0; |
mbed_official | 73:299c67215126 | 59 | float clkval = SystemCoreClock / 1000000.0f; |
mbed_official | 73:299c67215126 | 60 | |
mbed_official | 73:299c67215126 | 61 | while (clkval > 1) { |
mbed_official | 73:299c67215126 | 62 | clkdiv++; |
mbed_official | 73:299c67215126 | 63 | clkval /= 2.0; |
mbed_official | 73:299c67215126 | 64 | if (clkdiv == 7) |
mbed_official | 73:299c67215126 | 65 | break; |
mbed_official | 73:299c67215126 | 66 | } |
mbed_official | 73:299c67215126 | 67 | |
mbed_official | 73:299c67215126 | 68 | pwm_clock = clkval; |
mbed_official | 68:41613245dfd7 | 69 | unsigned int port = (unsigned int)pin >> PORT_SHIFT; |
mbed_official | 68:41613245dfd7 | 70 | unsigned int ftm_n = (pwm >> TPM_SHIFT); |
mbed_official | 68:41613245dfd7 | 71 | unsigned int ch_n = (pwm & 0xFF); |
mbed_official | 68:41613245dfd7 | 72 | |
mbed_official | 68:41613245dfd7 | 73 | SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port); |
mbed_official | 68:41613245dfd7 | 74 | SIM->SCGC6 |= 1 << (SIM_SCGC6_FTM0_SHIFT + ftm_n); |
mbed_official | 68:41613245dfd7 | 75 | |
mbed_official | 68:41613245dfd7 | 76 | FTM_Type *ftm = (FTM_Type *)(FTM0_BASE + 0x1000 * ftm_n); |
mbed_official | 68:41613245dfd7 | 77 | ftm->CONF |= FTM_CONF_BDMMODE(3); |
mbed_official | 73:299c67215126 | 78 | ftm->SC = FTM_SC_CLKS(1) | FTM_SC_PS(clkdiv); // (clock)MHz / clkdiv ~= (0.75)MHz |
mbed_official | 68:41613245dfd7 | 79 | 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 | 80 | |
mbed_official | 68:41613245dfd7 | 81 | obj->CnV = &ftm->CONTROLS[ch_n].CnV; |
mbed_official | 68:41613245dfd7 | 82 | obj->MOD = &ftm->MOD; |
mbed_official | 68:41613245dfd7 | 83 | obj->CNT = &ftm->CNT; |
mbed_official | 68:41613245dfd7 | 84 | |
mbed_official | 68:41613245dfd7 | 85 | // default to 20ms: standard for servos, and fine for e.g. brightness control |
mbed_official | 68:41613245dfd7 | 86 | pwmout_period_ms(obj, 20); |
mbed_official | 73:299c67215126 | 87 | pwmout_write(obj, 0); |
mbed_official | 68:41613245dfd7 | 88 | |
mbed_official | 68:41613245dfd7 | 89 | // Wire pinout |
mbed_official | 68:41613245dfd7 | 90 | pinmap_pinout(pin, PinMap_PWM); |
mbed_official | 68:41613245dfd7 | 91 | } |
mbed_official | 68:41613245dfd7 | 92 | |
mbed_official | 68:41613245dfd7 | 93 | void pwmout_free(pwmout_t* obj) {} |
mbed_official | 68:41613245dfd7 | 94 | |
mbed_official | 68:41613245dfd7 | 95 | void pwmout_write(pwmout_t* obj, float value) { |
mbed_official | 68:41613245dfd7 | 96 | if (value < 0.0) { |
mbed_official | 68:41613245dfd7 | 97 | value = 0.0; |
mbed_official | 68:41613245dfd7 | 98 | } else if (value > 1.0) { |
mbed_official | 68:41613245dfd7 | 99 | value = 1.0; |
mbed_official | 68:41613245dfd7 | 100 | } |
mbed_official | 68:41613245dfd7 | 101 | |
mbed_official | 264:91fcbf887208 | 102 | *obj->CnV = (uint32_t)((float)(*obj->MOD + 1) * value); |
mbed_official | 68:41613245dfd7 | 103 | } |
mbed_official | 68:41613245dfd7 | 104 | |
mbed_official | 68:41613245dfd7 | 105 | float pwmout_read(pwmout_t* obj) { |
mbed_official | 264:91fcbf887208 | 106 | float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1); |
mbed_official | 68:41613245dfd7 | 107 | return (v > 1.0) ? (1.0) : (v); |
mbed_official | 68:41613245dfd7 | 108 | } |
mbed_official | 68:41613245dfd7 | 109 | |
mbed_official | 68:41613245dfd7 | 110 | void pwmout_period(pwmout_t* obj, float seconds) { |
mbed_official | 68:41613245dfd7 | 111 | pwmout_period_us(obj, seconds * 1000000.0f); |
mbed_official | 68:41613245dfd7 | 112 | } |
mbed_official | 68:41613245dfd7 | 113 | |
mbed_official | 68:41613245dfd7 | 114 | void pwmout_period_ms(pwmout_t* obj, int ms) { |
mbed_official | 68:41613245dfd7 | 115 | pwmout_period_us(obj, ms * 1000); |
mbed_official | 68:41613245dfd7 | 116 | } |
mbed_official | 68:41613245dfd7 | 117 | |
mbed_official | 68:41613245dfd7 | 118 | // Set the PWM period, keeping the duty cycle the same. |
mbed_official | 68:41613245dfd7 | 119 | void pwmout_period_us(pwmout_t* obj, int us) { |
mbed_official | 68:41613245dfd7 | 120 | float dc = pwmout_read(obj); |
mbed_official | 264:91fcbf887208 | 121 | *obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1; |
mbed_official | 68:41613245dfd7 | 122 | pwmout_write(obj, dc); |
mbed_official | 68:41613245dfd7 | 123 | } |
mbed_official | 68:41613245dfd7 | 124 | |
mbed_official | 68:41613245dfd7 | 125 | void pwmout_pulsewidth(pwmout_t* obj, float seconds) { |
mbed_official | 68:41613245dfd7 | 126 | pwmout_pulsewidth_us(obj, seconds * 1000000.0f); |
mbed_official | 68:41613245dfd7 | 127 | } |
mbed_official | 68:41613245dfd7 | 128 | |
mbed_official | 68:41613245dfd7 | 129 | void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) { |
mbed_official | 68:41613245dfd7 | 130 | pwmout_pulsewidth_us(obj, ms * 1000); |
mbed_official | 68:41613245dfd7 | 131 | } |
mbed_official | 68:41613245dfd7 | 132 | |
mbed_official | 68:41613245dfd7 | 133 | void pwmout_pulsewidth_us(pwmout_t* obj, int us) { |
mbed_official | 73:299c67215126 | 134 | *obj->CnV = (uint32_t)(pwm_clock * (float)us); |
mbed_official | 68:41613245dfd7 | 135 | } |