75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
|
// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include "hal/spi_flash_hal.h"
|
||
|
|
#include "string.h"
|
||
|
|
#include "hal/hal_defs.h"
|
||
|
|
|
||
|
|
#define APB_CYCLE_NS (1000*1000*1000LL/APB_CLK_FREQ)
|
||
|
|
|
||
|
|
static const char TAG[] = "FLASH_HAL";
|
||
|
|
|
||
|
|
typedef struct {
|
||
|
|
int freq;
|
||
|
|
spi_flash_ll_clock_reg_t clock_reg_val;
|
||
|
|
} spi_flash_hal_clock_config_t;
|
||
|
|
|
||
|
|
|
||
|
|
static const spi_flash_hal_clock_config_t spi_flash_clk_cfg_reg[ESP_FLASH_SPEED_MAX] = {
|
||
|
|
{5e6, SPI_FLASH_LL_CLKREG_VAL_5MHZ},
|
||
|
|
{10e6, SPI_FLASH_LL_CLKREG_VAL_10MHZ},
|
||
|
|
{20e6, SPI_FLASH_LL_CLKREG_VAL_20MHZ},
|
||
|
|
{26e6, SPI_FLASH_LL_CLKREG_VAL_26MHZ},
|
||
|
|
{40e6, SPI_FLASH_LL_CLKREG_VAL_40MHZ},
|
||
|
|
{80e6, SPI_FLASH_LL_CLKREG_VAL_80MHZ},
|
||
|
|
};
|
||
|
|
|
||
|
|
static inline int get_dummy_n(bool gpio_is_used, int input_delay_ns, int eff_clk)
|
||
|
|
{
|
||
|
|
const int apbclk_kHz = APB_CLK_FREQ / 1000;
|
||
|
|
//calculate how many apb clocks a period has
|
||
|
|
const int apbclk_n = APB_CLK_FREQ / eff_clk;
|
||
|
|
const int gpio_delay_ns = gpio_is_used ? (APB_CYCLE_NS * 2) : 0;
|
||
|
|
|
||
|
|
//calculate how many apb clocks the delay is, the 1 is to compensate in case ``input_delay_ns`` is rounded off.
|
||
|
|
int apb_period_n = (1 + input_delay_ns + gpio_delay_ns) * apbclk_kHz / 1000 / 1000;
|
||
|
|
if (apb_period_n < 0) {
|
||
|
|
apb_period_n = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return apb_period_n / apbclk_n;
|
||
|
|
}
|
||
|
|
|
||
|
|
esp_err_t spi_flash_hal_init(spi_flash_memspi_data_t *data_out, const spi_flash_memspi_config_t *cfg)
|
||
|
|
{
|
||
|
|
if (!esp_ptr_internal(data_out)) {
|
||
|
|
return ESP_ERR_INVALID_ARG;
|
||
|
|
}
|
||
|
|
*data_out = (spi_flash_memspi_data_t) {
|
||
|
|
.spi = spi_flash_ll_get_hw(cfg->host_id),
|
||
|
|
.cs_num = cfg->cs_num,
|
||
|
|
.extra_dummy = get_dummy_n(!cfg->iomux, cfg->input_delay_ns, spi_flash_clk_cfg_reg[cfg->speed].freq),
|
||
|
|
.clock_conf = spi_flash_clk_cfg_reg[cfg->speed].clock_reg_val,
|
||
|
|
};
|
||
|
|
|
||
|
|
ESP_EARLY_LOGD(TAG, "extra_dummy: %d", data_out->extra_dummy);
|
||
|
|
return ESP_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline spi_dev_t *get_spi_dev(spi_flash_host_driver_t *chip_drv)
|
||
|
|
{
|
||
|
|
return ((spi_flash_memspi_data_t *)chip_drv->driver_data)->spi;
|
||
|
|
}
|