mirror of https://github.com/ARMmbed/mbed-os.git
139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2018-2019 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed_assert.h"
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#include "pwmout_api.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#include "ti/drivers/pwm/PWMTimerCC32XX.h"
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#include "ti/drivers/PWM.h"
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#include "CC3220SF_LAUNCHXL.h"
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extern const PWM_Config PWM_config[];
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void pwmout_init(pwmout_t *obj, PinName pin)
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{
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PWM_Params pwmParams;
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int pwmIndex = CC3220SF_LAUNCHXL_PWMCOUNT;
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PWM_init();
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PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
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MBED_ASSERT(pwm != (PWMName)NC);
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obj->pwm = pwm;
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switch (pin) {
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case PIN_01:
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pwmIndex = CC3220SF_LAUNCHXL_PWM6;
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break;
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case PIN_02:
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pwmIndex = CC3220SF_LAUNCHXL_PWM7;
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break;
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case PIN_17:
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pwmIndex = CC3220SF_LAUNCHXL_PWM0;
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break;
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case PIN_19:
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pwmIndex = CC3220SF_LAUNCHXL_PWM3;
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break;
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case PIN_21:
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pwmIndex = CC3220SF_LAUNCHXL_PWM2;
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break;
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case PIN_64:
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pwmIndex = CC3220SF_LAUNCHXL_PWM5;
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break;
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default:
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while (1);
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}
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obj->handle = (void *)&PWM_config[pwmIndex];
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// Initialize the PWM parameters
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PWM_Params_init(&pwmParams);
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obj->duty_percent = PWM_DEFAULT_DUTY_PERCENT;
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obj->period_us = PWM_DEFAULT_PERIOD_US;
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if (PWM_open(pwmIndex, &pwmParams)) {
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PWM_start((PWM_Handle)obj->handle);
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} else {
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while (1);
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}
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}
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void pwmout_free(pwmout_t *obj)
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{
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PWM_stop((PWM_Handle)obj->handle);
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PWM_close((PWM_Handle)obj->handle);
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}
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void pwmout_write(pwmout_t *obj, float value)
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{
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PWM_setDuty((PWM_Handle)obj->handle, value * 100);
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obj->duty_percent = value;
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}
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float pwmout_read(pwmout_t *obj)
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{
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return (obj->duty_percent);
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}
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void pwmout_period(pwmout_t *obj, float seconds)
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{
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pwmout_period_us(obj, seconds * 1000 * 1000);
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}
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void pwmout_period_ms(pwmout_t *obj, int ms)
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{
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pwmout_period_us(obj, ms * 1000);
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}
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// Set the PWM period, keeping the duty cycle the same.
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void pwmout_period_us(pwmout_t *obj, int us)
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{
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PWM_setPeriod((PWM_Handle)obj->handle, us);
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obj->period_us = us;
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}
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void pwmout_pulsewidth(pwmout_t *obj, float seconds)
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{
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pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
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}
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void pwmout_pulsewidth_ms(pwmout_t *obj, int ms)
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{
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pwmout_pulsewidth_us(obj, ms * 1000);
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}
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void pwmout_pulsewidth_us(pwmout_t *obj, int us)
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{
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if (obj->period_us) {
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float value = (float)us / (float)obj->period_us;
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pwmout_write(obj, value);
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}
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}
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const PinMap *pwmout_pinmap()
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{
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return PinMap_PWM;
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}
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