74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
// Copyright 2015-2018 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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//
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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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#include <stdlib.h>
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#include "hal/spi_flash_hal.h"
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#include "string.h"
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#include "hal/hal_defs.h"
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#define APB_CYCLE_NS (1000*1000*1000LL/APB_CLK_FREQ)
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static const char TAG[] = "FLASH_HAL";
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typedef struct {
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int freq;
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spi_flash_ll_clock_reg_t clock_reg_val;
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} spi_flash_hal_clock_config_t;
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static const spi_flash_hal_clock_config_t spi_flash_clk_cfg_reg[ESP_FLASH_SPEED_MAX] = {
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{5e6, SPI_FLASH_LL_CLKREG_VAL_5MHZ},
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{10e6, SPI_FLASH_LL_CLKREG_VAL_10MHZ},
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{20e6, SPI_FLASH_LL_CLKREG_VAL_20MHZ},
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{26e6, SPI_FLASH_LL_CLKREG_VAL_26MHZ},
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{40e6, SPI_FLASH_LL_CLKREG_VAL_40MHZ},
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{80e6, SPI_FLASH_LL_CLKREG_VAL_80MHZ},
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};
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static inline int get_dummy_n(bool gpio_is_used, int input_delay_ns, int eff_clk)
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{
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const int apbclk_kHz = APB_CLK_FREQ / 1000;
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//calculate how many apb clocks a period has
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const int apbclk_n = APB_CLK_FREQ / eff_clk;
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const int gpio_delay_ns = gpio_is_used ? (APB_CYCLE_NS * 2) : 0;
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//calculate how many apb clocks the delay is, the 1 is to compensate in case ``input_delay_ns`` is rounded off.
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int apb_period_n = (1 + input_delay_ns + gpio_delay_ns) * apbclk_kHz / 1000 / 1000;
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if (apb_period_n < 0) {
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apb_period_n = 0;
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}
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return apb_period_n / apbclk_n;
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}
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esp_err_t spi_flash_hal_init(spi_flash_memspi_data_t *data_out, const spi_flash_memspi_config_t *cfg)
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{
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if (!esp_ptr_internal(data_out)) {
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return ESP_ERR_INVALID_ARG;
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}
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*data_out = (spi_flash_memspi_data_t) {
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.spi = spi_flash_ll_get_hw(cfg->host_id),
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.cs_num = cfg->cs_num,
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.extra_dummy = get_dummy_n(!cfg->iomux, cfg->input_delay_ns, spi_flash_clk_cfg_reg[cfg->speed].freq),
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.clock_conf = spi_flash_clk_cfg_reg[cfg->speed].clock_reg_val,
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};
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ESP_EARLY_LOGD(TAG, "extra_dummy: %d", data_out->extra_dummy);
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return ESP_OK;
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}
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static inline spi_dev_t *get_spi_dev(spi_flash_host_driver_t *chip_drv)
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{
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return ((spi_flash_memspi_data_t *)chip_drv->driver_data)->spi;
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}
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