pinebuds/platform/hal/hal_pwm.c

204 lines
5.2 KiB
C

/***************************************************************************
*
* Copyright 2015-2019 BES.
* All rights reserved. All unpublished rights reserved.
*
* No part of this work may be used or reproduced in any form or by any
* means, or stored in a database or retrieval system, without prior written
* permission of BES.
*
* Use of this work is governed by a license granted by BES.
* This work contains confidential and proprietary information of
* BES. which is protected by copyright, trade secret,
* trademark and other intellectual property rights.
*
****************************************************************************/
#include "plat_addr_map.h"
#include "hal_pwm.h"
#include "reg_pwm.h"
#include "cmsis.h"
#include "hal_cmu.h"
#include "hal_timer.h"
#include "hal_trace.h"
#define PWM_SLOW_CLOCK (CONFIG_SYSTICK_HZ)
#define PWM_FAST_CLOCK (hal_cmu_get_crystal_freq() / 2)
#define PWM_MAX_VALUE 0xFFFF
// Max allowed PWM freqency error in percentage
#define PWM_MAX_FREQ_ERR_PCT 5
static struct PWM_T * const pwm[] = {
(struct PWM_T *)PWM_BASE,
#ifdef CHIP_BEST2000
(struct PWM_T *)AON_PWM_BASE,
#endif
};
static const enum HAL_CMU_MOD_ID_T pwm_o_mod[] = {
HAL_CMU_MOD_O_PWM0,
#ifdef CHIP_BEST2000
HAL_CMU_AON_O_PWM0,
#endif
};
static const enum HAL_CMU_MOD_ID_T pwm_p_mod[] = {
HAL_CMU_MOD_P_PWM,
#ifdef CHIP_BEST2000
HAL_CMU_AON_A_PWM,
#endif
};
int hal_pwm_enable(enum HAL_PWM_ID_T id, const struct HAL_PWM_CFG_T *cfg)
{
uint32_t mod_freq;
uint32_t load;
uint32_t toggle;
uint32_t lock;
uint8_t ratio;
uint8_t index;
uint8_t offset;
if (id >= HAL_PWM_ID_QTY) {
return 1;
}
if (cfg->ratio > 100) {
return 2;
}
if (cfg->inv && (cfg->ratio == 0 || cfg->ratio == 100)) {
ratio = 100 - cfg->ratio;
} else {
ratio = cfg->ratio;
}
#ifdef PWM_TRY_SLOW_CLOCK
mod_freq = PWM_SLOW_CLOCK;
#else
if (cfg->sleep_on) {
mod_freq = PWM_SLOW_CLOCK;
} else {
mod_freq = PWM_FAST_CLOCK;
}
#endif
if (ratio == 100) {
load = PWM_MAX_VALUE;
toggle = PWM_MAX_VALUE;
} else if (ratio == 0) {
load = 0;
toggle = 0;
} else {
load = mod_freq / cfg->freq;
toggle = load * ratio / 100;
if (toggle == 0) {
toggle = 1;
}
#ifdef PWM_TRY_SLOW_CLOCK
// Check PWM frequency error in percentage
if (!cfg->sleep_on && ABS((int)(toggle * 100 - load * ratio)) > load * PWM_MAX_FREQ_ERR_PCT) {
mod_freq = PWM_FAST_CLOCK;
load = mod_freq / cfg->freq;
toggle = load * ratio / 100;
}
#endif
load = PWM_MAX_VALUE + 1 - load;
toggle = PWM_MAX_VALUE - toggle;
}
#ifdef CHIP_BEST2000
if (id < HAL_PWM2_ID_0) {
index = 0;
offset = id - HAL_PWM_ID_0;
} else {
index = 1;
offset = id - HAL_PWM2_ID_0;
}
#else
index = 0;
offset = id - HAL_PWM_ID_0;
#endif
if (hal_cmu_reset_get_status(pwm_o_mod[index] + offset) == HAL_CMU_RST_SET) {
hal_cmu_clock_enable(pwm_o_mod[index] + offset);
hal_cmu_clock_enable(pwm_p_mod[index]);
hal_cmu_reset_clear(pwm_o_mod[index] + offset);
hal_cmu_reset_clear(pwm_p_mod[index]);
} else {
pwm[index]->EN &= ~(1 << offset);
}
if (ratio == 0) {
// Output 0 when disabled
return 0;
}
hal_cmu_pwm_set_freq(id, mod_freq);
lock = int_lock();
if (offset == 0) {
pwm[index]->LOAD01 = SET_BITFIELD(pwm[index]->LOAD01, PWM_LOAD01_0, load);
pwm[index]->TOGGLE01 = SET_BITFIELD(pwm[index]->TOGGLE01, PWM_TOGGLE01_0, toggle);
} else if (offset == 1) {
pwm[index]->LOAD01 = SET_BITFIELD(pwm[index]->LOAD01, PWM_LOAD01_1, load);
pwm[index]->TOGGLE01 = SET_BITFIELD(pwm[index]->TOGGLE01, PWM_TOGGLE01_1, toggle);
} else if (offset == 2) {
pwm[index]->LOAD23 = SET_BITFIELD(pwm[index]->LOAD23, PWM_LOAD23_2, load);
pwm[index]->TOGGLE23 = SET_BITFIELD(pwm[index]->TOGGLE23, PWM_TOGGLE23_2, toggle);
} else {
pwm[index]->LOAD23 = SET_BITFIELD(pwm[index]->LOAD23, PWM_LOAD23_3, load);
pwm[index]->TOGGLE23 = SET_BITFIELD(pwm[index]->TOGGLE23, PWM_TOGGLE23_3, toggle);
}
if (cfg->inv) {
pwm[index]->INV |= (1 << offset);
} else {
pwm[index]->INV &= ~(1 << offset);
}
pwm[index]->EN |= (1 << offset);
int_unlock(lock);
return 0;
}
int hal_pwm_disable(enum HAL_PWM_ID_T id)
{
uint8_t index;
uint8_t offset;
if (id >= HAL_PWM_ID_QTY) {
return 1;
}
#ifdef CHIP_BEST2000
if (id < HAL_PWM2_ID_0) {
index = 0;
offset = id - HAL_PWM_ID_0;
} else {
index = 1;
offset = id - HAL_PWM2_ID_0;
}
#else
index = 0;
offset = id - HAL_PWM_ID_0;
#endif
if (hal_cmu_reset_get_status(pwm_o_mod[index] + offset) == HAL_CMU_RST_SET) {
return 0;
}
pwm[index]->EN &= ~(1 << offset);
hal_cmu_reset_set(pwm_o_mod[index] + offset);
hal_cmu_clock_disable(pwm_o_mod[index] + offset);
if (pwm[index]->EN == 0) {
hal_cmu_reset_set(pwm_p_mod[index]);
hal_cmu_clock_disable(pwm_p_mod[index]);
}
return 0;
}