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/*
* Copyright (c) 2021-2024 RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-06-02 supperthomas first version
* 2024-12-08 wumingzi support rt_hw_us_delay
*/
#include <rtthread.h>
#include "rttypes.h"
#include "hal/systimer_hal.h"
#include "hal/systimer_ll.h"
#include "esp_private/panic_internal.h"
#include "esp_private/systimer.h"
#include "esp_private/periph_ctrl.h"
#include "esp_intr_alloc.h"
#include "esp_attr.h"
#include "esp_timer.h"
#include "driver/gptimer.h"
static systimer_hal_context_t systimer_hal;
IRAM_ATTR void rt_SysTickIsrHandler(void *arg)
{
systimer_ll_clear_alarm_int(systimer_hal.dev, SYSTIMER_LL_ALARM_OS_TICK_CORE0);
rt_interrupt_enter();
rt_tick_increase();
rt_interrupt_leave();
}
void rt_hw_systick_init(void)
{
esp_intr_alloc(ETS_SYSTIMER_TARGET0_EDGE_INTR_SOURCE, ESP_INTR_FLAG_IRAM | ESP_INTR_FLAG_LEVEL1, rt_SysTickIsrHandler, &systimer_hal, NULL);
periph_module_enable(PERIPH_SYSTIMER_MODULE);
systimer_hal_init(&systimer_hal);
systimer_hal_tick_rate_ops_t ops = {
.ticks_to_us = systimer_ticks_to_us,
.us_to_ticks = systimer_us_to_ticks,
};
systimer_hal_set_tick_rate_ops(&systimer_hal, &ops);
systimer_ll_set_counter_value(systimer_hal.dev, SYSTIMER_LL_COUNTER_OS_TICK, 0);
systimer_ll_apply_counter_value(systimer_hal.dev, SYSTIMER_LL_COUNTER_OS_TICK);
systimer_hal_connect_alarm_counter(&systimer_hal, SYSTIMER_LL_ALARM_OS_TICK_CORE0, SYSTIMER_LL_COUNTER_OS_TICK);
systimer_hal_set_alarm_period(&systimer_hal, SYSTIMER_LL_ALARM_OS_TICK_CORE0, 1000000UL / RT_TICK_PER_SECOND);
systimer_hal_select_alarm_mode(&systimer_hal, SYSTIMER_LL_ALARM_OS_TICK_CORE0, SYSTIMER_ALARM_MODE_PERIOD);
systimer_hal_counter_can_stall_by_cpu(&systimer_hal, 1, 0, true);
systimer_hal_enable_alarm_int(&systimer_hal, SYSTIMER_LL_ALARM_OS_TICK_CORE0);
systimer_hal_enable_counter(&systimer_hal, SYSTIMER_LL_COUNTER_OS_TICK);
}
void rt_hw_board_init(void)
{
rt_hw_systick_init();
/* Board underlying hardware initialization */
#ifdef RT_USING_COMPONENTS_INIT
rt_components_board_init();
#endif
#if defined(RT_USING_CONSOLE) && defined(RT_USING_DEVICE)
rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
#endif
}
static gptimer_handle_t gptimer_hw_us = NULL;
static int delay_us_init(void)
{
gptimer_config_t timer_config = {
.clk_src = GPTIMER_CLK_SRC_DEFAULT,
.direction = GPTIMER_COUNT_UP,
.resolution_hz = 1 * 1000 * 1000, /* 1MHz, 1 tick = 1us*/
};
ESP_ERROR_CHECK(gptimer_new_timer(&timer_config, &gptimer_hw_us));
ESP_ERROR_CHECK(gptimer_enable(gptimer_hw_us));
return RT_EOK;
}
INIT_DEVICE_EXPORT(delay_us_init);
void rt_hw_us_delay(rt_uint32_t us)
{
uint64_t count = 0;
ESP_ERROR_CHECK(gptimer_start(gptimer_hw_us));
ESP_ERROR_CHECK(gptimer_set_raw_count(gptimer_hw_us, 0));
/* Retrieve the timestamp at anytime*/
while(count < (uint64_t)us)
{
ESP_ERROR_CHECK(gptimer_get_raw_count(gptimer_hw_us, &count));
}
ESP_ERROR_CHECK(gptimer_stop(gptimer_hw_us));
}
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