kopia lustrzana https://github.com/espressif/esp-idf
61 wiersze
2.3 KiB
C
61 wiersze
2.3 KiB
C
// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
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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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// 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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// The HAL layer for LEDC (common part)
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#include "esp_attr.h"
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#include "hal/ledc_hal.h"
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void ledc_hal_init(ledc_hal_context_t *hal, ledc_mode_t speed_mode)
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{
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//Get hardware instance.
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hal->dev = LEDC_LL_GET_HW();
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hal->speed_mode = speed_mode;
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}
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void ledc_hal_get_clk_cfg(ledc_hal_context_t *hal, ledc_timer_t timer_sel, ledc_clk_cfg_t *clk_cfg)
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{
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ledc_clk_src_t clk_src = LEDC_APB_CLK;
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ledc_hal_get_clock_source(hal, timer_sel, &clk_src);
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if (clk_src == LEDC_REF_TICK) {
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*clk_cfg = LEDC_USE_REF_TICK;
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} else {
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*clk_cfg = LEDC_USE_APB_CLK;
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if (hal->speed_mode == LEDC_LOW_SPEED_MODE) {
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ledc_slow_clk_sel_t slow_clk = LEDC_SLOW_CLK_APB;
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ledc_hal_get_slow_clk_sel(hal, &slow_clk);
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if (slow_clk == LEDC_SLOW_CLK_RTC8M) {
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*clk_cfg = LEDC_USE_RTC8M_CLK;
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#if SOC_LEDC_SUPPORT_XTAL_CLOCK
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} else if (slow_clk == LEDC_SLOW_CLK_XTAL) {
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*clk_cfg = LEDC_USE_XTAL_CLK;
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#endif
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}
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}
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}
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}
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void ledc_hal_set_slow_clk(ledc_hal_context_t *hal, ledc_clk_cfg_t clk_cfg)
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{
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// For low speed channels, if RTC_8MCLK is used as the source clock, the `slow_clk_sel` register should be cleared, otherwise it should be set.
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ledc_slow_clk_sel_t slow_clk_sel = LEDC_SLOW_CLK_APB;
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#if SOC_LEDC_SUPPORT_XTAL_CLOCK
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slow_clk_sel = (clk_cfg == LEDC_USE_RTC8M_CLK) ? LEDC_SLOW_CLK_RTC8M :
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((clk_cfg == LEDC_USE_XTAL_CLK) ? LEDC_SLOW_CLK_XTAL : LEDC_SLOW_CLK_APB);
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#else
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slow_clk_sel = (clk_cfg == LEDC_USE_RTC8M_CLK) ? LEDC_SLOW_CLK_RTC8M : LEDC_SLOW_CLK_APB;
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#endif
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ledc_hal_set_slow_clk_sel(hal, slow_clk_sel);
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}
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