109 lines
3.9 KiB
C
109 lines
3.9 KiB
C
/*
|
|
* This file is part of the Micro Python project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2016 Glenn Ruben Bakke
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
|
|
#include "mphalport.h"
|
|
#include "hal_pwm.h"
|
|
|
|
#ifdef HAL_PWM_MODULE_ENABLED
|
|
|
|
#define PWM_COUNTER_TOP 16000 // 16MHz divided by 16000-> 1ms
|
|
|
|
volatile uint16_t g_pwm_seq[4];
|
|
volatile uint16_t g_pwm_period;
|
|
|
|
static const uint32_t hal_pwm_frequency_lookup[] = {
|
|
PWM_PRESCALER_PRESCALER_DIV_1, // 16MHz
|
|
PWM_PRESCALER_PRESCALER_DIV_2, // 8MHz
|
|
PWM_PRESCALER_PRESCALER_DIV_4, // 4MHz
|
|
PWM_PRESCALER_PRESCALER_DIV_8, // 2MHz
|
|
PWM_PRESCALER_PRESCALER_DIV_16, // 1MHz
|
|
PWM_PRESCALER_PRESCALER_DIV_32, // 500kHz
|
|
PWM_PRESCALER_PRESCALER_DIV_64, // 250kHz
|
|
PWM_PRESCALER_PRESCALER_DIV_128 // 125kHz
|
|
};
|
|
|
|
void hal_pwm_init(NRF_PWM_Type * p_instance, hal_pwm_init_t const * p_pwm_init) {
|
|
g_pwm_period = p_pwm_init->period;
|
|
uint16_t duty_cycle = ((g_pwm_period * p_pwm_init->duty)/100);
|
|
|
|
g_pwm_seq[0] = duty_cycle;
|
|
g_pwm_seq[1] = duty_cycle;
|
|
g_pwm_seq[2] = 0;
|
|
g_pwm_seq[3] = 0;
|
|
|
|
p_instance->PSEL.OUT[0] = (p_pwm_init->pwm_pin << PWM_PSEL_OUT_PIN_Pos)
|
|
| (PWM_PSEL_OUT_CONNECT_Connected << PWM_PSEL_OUT_CONNECT_Pos);
|
|
|
|
p_instance->ENABLE = (PWM_ENABLE_ENABLE_Enabled << PWM_ENABLE_ENABLE_Pos);
|
|
p_instance->MODE = (PWM_MODE_UPDOWN_Up << PWM_MODE_UPDOWN_Pos);
|
|
p_instance->PRESCALER = (hal_pwm_frequency_lookup[p_pwm_init->freq] << PWM_PRESCALER_PRESCALER_Pos);
|
|
p_instance->COUNTERTOP = (p_pwm_init->period << PWM_COUNTERTOP_COUNTERTOP_Pos);
|
|
p_instance->LOOP = (PWM_LOOP_CNT_Disabled << PWM_LOOP_CNT_Pos);
|
|
p_instance->DECODER = (PWM_DECODER_LOAD_Individual << PWM_DECODER_LOAD_Pos)
|
|
| (PWM_DECODER_MODE_RefreshCount << PWM_DECODER_MODE_Pos);
|
|
p_instance->SEQ[0].PTR = ((uint32_t)(g_pwm_seq) << PWM_SEQ_PTR_PTR_Pos);
|
|
p_instance->SEQ[0].CNT = ((sizeof(g_pwm_seq) / sizeof(uint16_t)) << PWM_SEQ_CNT_CNT_Pos);
|
|
|
|
p_instance->SEQ[0].REFRESH = 0;
|
|
p_instance->SEQ[0].ENDDELAY = 0;
|
|
p_instance->TASKS_SEQSTART[0] = 1;
|
|
}
|
|
|
|
void hal_pwm_start(NRF_PWM_Type * p_instance) {
|
|
// p_instance->TASKS_SEQSTART[0] = 1;
|
|
}
|
|
|
|
void hal_pwm_stop(NRF_PWM_Type * p_instance) {
|
|
// p_instance->TASKS_STOP = 1;
|
|
}
|
|
|
|
void hal_pwm_freq_set(NRF_PWM_Type * p_instance, uint16_t freq) {
|
|
#if 0
|
|
p_instance->PRESCALER = (hal_pwm_frequency_lookup[freq] << PWM_PRESCALER_PRESCALER_Pos);
|
|
#endif
|
|
}
|
|
|
|
void hal_pwm_period_set(NRF_PWM_Type * p_instance, uint16_t period) {
|
|
#if 0
|
|
g_pwm_period = period;
|
|
p_instance->COUNTERTOP = (g_pwm_period << PWM_COUNTERTOP_COUNTERTOP_Pos);
|
|
#endif
|
|
}
|
|
|
|
void hal_pwm_duty_set(NRF_PWM_Type * p_instance, uint8_t duty) {
|
|
#if 0
|
|
uint16_t duty_cycle = ((g_pwm_period * duty)/100);
|
|
|
|
g_pwm_seq[0] = duty_cycle;
|
|
g_pwm_seq[1] = duty_cycle;
|
|
#endif
|
|
}
|
|
|
|
#endif // HAL_PWM_MODULE_ENABLED
|