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micropython/ports/esp32/machine_sdcard.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Nicko van Someren
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <string.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "py/mperrno.h"
#include "extmod/vfs_fat.h"
#include "driver/sdmmc_host.h"
#include "driver/sdspi_host.h"
#include "sdmmc_cmd.h"
#include "esp_log.h"
#define DEBUG 0
#if DEBUG
#define DEBUG_printf(...) ESP_LOGI("modsdcard", __VA_ARGS__)
#else
#define DEBUG_printf(...) (void)0
#endif
//
// There are three layers of abstraction: host, slot and card.
// Creating an SD Card object will initialise the host and slot.
// Cards gets initialised by ioctl op==1 and de-inited by ioctl 2
// Hosts are de-inited in __del__. Slots do not need de-initing.
//
// Currently the ESP32 Library doesn't support MMC cards, so
// we don't enable on MICROPY_HW_ENABLE_MMCARD.
#if MICROPY_HW_ENABLE_SDCARD
// Forward declaration
const mp_obj_type_t machine_sdcard_type;
typedef struct _sdcard_obj_t {
mp_obj_base_t base;
mp_int_t flags;
sdmmc_host_t host;
// The card structure duplicates the host. It's not clear if we
// can avoid this given the way that it is copied.
sdmmc_card_t card;
} sdcard_card_obj_t;
#define SDCARD_CARD_FLAGS_HOST_INIT_DONE 0x01
#define SDCARD_CARD_FLAGS_CARD_INIT_DONE 0x02
#define _SECTOR_SIZE(self) (self->card.csd.sector_size)
STATIC esp_err_t check_esp_err(esp_err_t code) {
switch (code) {
case ESP_OK:
return ESP_OK;
case ESP_ERR_NO_MEM:
code = MP_ENOMEM;
break;
case ESP_ERR_TIMEOUT:
code = MP_ETIMEDOUT;
break;
case ESP_ERR_NOT_SUPPORTED:
code = MP_EOPNOTSUPP;
break;
}
mp_raise_OSError(code);
}
STATIC gpio_num_t pin_or_int(const mp_obj_t arg) {
if (mp_obj_is_small_int(arg)) {
return MP_OBJ_SMALL_INT_VALUE(arg);
} else {
// This raises a value error if the argument is not a Pin.
return machine_pin_get_id(arg);
}
}
#define SET_CONFIG_PIN(config, pin_var, arg_id) \
if (arg_vals[arg_id].u_obj != mp_const_none) \
config.pin_var = pin_or_int(arg_vals[arg_id].u_obj)
STATIC esp_err_t sdcard_ensure_card_init(sdcard_card_obj_t *self, bool force) {
if (force || !(self->flags & SDCARD_CARD_FLAGS_CARD_INIT_DONE)) {
DEBUG_printf(" Calling card init");
esp_err_t err = sdmmc_card_init(&(self->host), &(self->card));
if (err == ESP_OK) {
self->flags |= SDCARD_CARD_FLAGS_CARD_INIT_DONE;
} else {
self->flags &= ~SDCARD_CARD_FLAGS_CARD_INIT_DONE;
}
DEBUG_printf(" Card init returned: %i", err);
return err;
} else {
return ESP_OK;
}
}
/******************************************************************************/
// MicroPython bindings
//
// Expose the SD card or MMC as an object with the block protocol.
// Create a new SDCard object
// The driver supports either the host SD/MMC controller (default) or SPI mode
// In both cases there are two "slots". Slot 0 on the SD/MMC controller is
// typically tied up with the flash interface in most ESP32 modules but in
// theory supports 1, 4 or 8-bit transfers. Slot 1 supports only 1 and 4-bit
// transfers. Only 1-bit is supported on the SPI interfaces.
// card = SDCard(slot=1, width=None, present_pin=None, wp_pin=None)
STATIC mp_obj_t machine_sdcard_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
// check arguments
enum {
ARG_slot,
ARG_width,
ARG_cd,
ARG_wp,
ARG_miso,
ARG_mosi,
ARG_sck,
ARG_cs,
};
STATIC const mp_arg_t allowed_args[] = {
{ MP_QSTR_slot, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
{ MP_QSTR_width, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 1} },
{ MP_QSTR_cd, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_wp, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
// These are only needed if using SPI mode
{ MP_QSTR_miso, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_mosi, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_sck, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
{ MP_QSTR_cs, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
};
mp_arg_val_t arg_vals[MP_ARRAY_SIZE(allowed_args)];
mp_map_t kw_args;
DEBUG_printf("Making new SDCard:n");
DEBUG_printf(" Unpacking arguments");
mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
mp_arg_parse_all(n_args, args, &kw_args,
MP_ARRAY_SIZE(allowed_args), allowed_args, arg_vals);
DEBUG_printf(" slot=%d, width=%d, cd=%p, wp=%p",
arg_vals[ARG_slot].u_int, arg_vals[ARG_width].u_int,
arg_vals[ARG_cd].u_obj, arg_vals[ARG_wp].u_obj);
DEBUG_printf(" miso=%p, mosi=%p, sck=%p, cs=%p",
arg_vals[ARG_miso].u_obj, arg_vals[ARG_mosi].u_obj,
arg_vals[ARG_sck].u_obj, arg_vals[ARG_cs].u_obj);
int slot_num = arg_vals[ARG_slot].u_int;
if (slot_num < 0 || slot_num > 3) {
mp_raise_ValueError("Slot number must be between 0 and 3 inclusive");
}
// Slots 0 and 1 are native SD/MMC, slots 2 and 3 are SPI
bool is_spi = (slot_num >= 2);
if (is_spi) {
slot_num -= 2;
}
DEBUG_printf(" Setting up host configuration");
sdcard_card_obj_t *self = m_new_obj_with_finaliser(sdcard_card_obj_t);
self->base.type = &machine_sdcard_type;
self->flags = 0;
// Note that these defaults are macros that expand to structure
// constants so we can't directly assign them to fields.
if (is_spi) {
sdmmc_host_t _temp_host = SDSPI_HOST_DEFAULT();
self->host = _temp_host;
} else {
sdmmc_host_t _temp_host = SDMMC_HOST_DEFAULT();
self->host = _temp_host;
}
if (is_spi) {
self->host.slot = slot_num ? HSPI_HOST : VSPI_HOST;
}
DEBUG_printf(" Calling host.init()");
check_esp_err(self->host.init());
self->flags |= SDCARD_CARD_FLAGS_HOST_INIT_DONE;
if (is_spi) {
// SPI interface
STATIC const sdspi_slot_config_t slot_defaults[2] = {
{
.gpio_miso = GPIO_NUM_19,
.gpio_mosi = GPIO_NUM_23,
.gpio_sck = GPIO_NUM_18,
.gpio_cs = GPIO_NUM_5,
.gpio_cd = SDSPI_SLOT_NO_CD,
.gpio_wp = SDSPI_SLOT_NO_WP,
.dma_channel = 2
},
SDSPI_SLOT_CONFIG_DEFAULT()
};
DEBUG_printf(" Setting up SPI slot configuration");
sdspi_slot_config_t slot_config = slot_defaults[slot_num];
SET_CONFIG_PIN(slot_config, gpio_cd, ARG_cd);
SET_CONFIG_PIN(slot_config, gpio_wp, ARG_wp);
SET_CONFIG_PIN(slot_config, gpio_miso, ARG_miso);
SET_CONFIG_PIN(slot_config, gpio_mosi, ARG_mosi);
SET_CONFIG_PIN(slot_config, gpio_sck, ARG_sck);
SET_CONFIG_PIN(slot_config, gpio_cs, ARG_cs);
DEBUG_printf(" Calling init_slot()");
check_esp_err(sdspi_host_init_slot(self->host.slot, &slot_config));
} else {
// SD/MMC interface
DEBUG_printf(" Setting up SDMMC slot configuration");
sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
// Stronger external pull-ups are still needed but apparently
// it is a good idea to set the internal pull-ups anyway.
// slot_config.flags = SDMMC_SLOT_FLAG_INTERNAL_PULLUP;
SET_CONFIG_PIN(slot_config, gpio_cd, ARG_cd);
SET_CONFIG_PIN(slot_config, gpio_wp, ARG_wp);
int width = arg_vals[ARG_width].u_int;
if (width == 1 || width == 4 || (width == 8 && slot_num == 0)) {
slot_config.width = width;
} else {
mp_raise_ValueError("Width must be 1 or 4 (or 8 on slot 0)");
}
DEBUG_printf(" Calling init_slot()");
check_esp_err(sdmmc_host_init_slot(self->host.slot, &slot_config));
}
DEBUG_printf(" Returning new card object: %p", self);
return MP_OBJ_FROM_PTR(self);
}
STATIC mp_obj_t sd_deinit(mp_obj_t self_in) {
sdcard_card_obj_t *self = self_in;
DEBUG_printf("De-init host\n");
if (self->flags & SDCARD_CARD_FLAGS_HOST_INIT_DONE) {
self->host.deinit();
self->flags &= ~SDCARD_CARD_FLAGS_HOST_INIT_DONE;
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(sd_deinit_obj, sd_deinit);
STATIC mp_obj_t sd_info(mp_obj_t self_in) {
sdcard_card_obj_t *self = self_in;
// We could potential return a great deal more SD card data but it
// is not clear that it is worth the extra code space to do
// so. For the most part people only care about the card size and
// block size.
check_esp_err(sdcard_ensure_card_init((sdcard_card_obj_t *) self, false));
uint32_t log_block_nbr = self->card.csd.capacity;
uint32_t log_block_size = _SECTOR_SIZE(self);
mp_obj_t tuple[2] = {
mp_obj_new_int_from_ull((uint64_t)log_block_nbr * (uint64_t)log_block_size),
mp_obj_new_int_from_uint(log_block_size),
};
return mp_obj_new_tuple(2, tuple);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(sd_info_obj, sd_info);
STATIC mp_obj_t machine_sdcard_readblocks(mp_obj_t self_in, mp_obj_t block_num, mp_obj_t buf) {
sdcard_card_obj_t *self = self_in;
mp_buffer_info_t bufinfo;
esp_err_t err;
err = sdcard_ensure_card_init((sdcard_card_obj_t *) self, false);
if (err != ESP_OK) {
return false;
}
mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_WRITE);
err = sdmmc_read_sectors(&(self->card), bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / _SECTOR_SIZE(self) );
return mp_obj_new_bool(err == ESP_OK);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(machine_sdcard_readblocks_obj, machine_sdcard_readblocks);
STATIC mp_obj_t machine_sdcard_writeblocks(mp_obj_t self_in, mp_obj_t block_num, mp_obj_t buf) {
sdcard_card_obj_t *self = self_in;
mp_buffer_info_t bufinfo;
esp_err_t err;
err = sdcard_ensure_card_init((sdcard_card_obj_t *) self, false);
if (err != ESP_OK) {
return false;
}
mp_get_buffer_raise(buf, &bufinfo, MP_BUFFER_READ);
err = sdmmc_write_sectors(&(self->card), bufinfo.buf, mp_obj_get_int(block_num), bufinfo.len / _SECTOR_SIZE(self) );
return mp_obj_new_bool(err == ESP_OK);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(machine_sdcard_writeblocks_obj, machine_sdcard_writeblocks);
STATIC mp_obj_t machine_sdcard_ioctl(mp_obj_t self_in, mp_obj_t cmd_in, mp_obj_t arg_in) {
sdcard_card_obj_t *self = self_in;
esp_err_t err = ESP_OK;
mp_int_t cmd = mp_obj_get_int(cmd_in);
switch (cmd) {
case MP_BLOCKDEV_IOCTL_INIT:
err = sdcard_ensure_card_init(self, false);
return MP_OBJ_NEW_SMALL_INT((err == ESP_OK) ? 0 : -1);
case MP_BLOCKDEV_IOCTL_DEINIT:
// Ensure that future attempts to look at info re-read the card
self->flags &= ~SDCARD_CARD_FLAGS_CARD_INIT_DONE;
return MP_OBJ_NEW_SMALL_INT(0); // success
case MP_BLOCKDEV_IOCTL_SYNC:
// nothing to do
return MP_OBJ_NEW_SMALL_INT(0); // success
case MP_BLOCKDEV_IOCTL_BLOCK_COUNT:
err = sdcard_ensure_card_init(self, false);
if (err != ESP_OK) {
return MP_OBJ_NEW_SMALL_INT(-1);
}
return MP_OBJ_NEW_SMALL_INT(self->card.csd.capacity);
case MP_BLOCKDEV_IOCTL_BLOCK_SIZE:
err = sdcard_ensure_card_init(self, false);
if (err != ESP_OK) {
return MP_OBJ_NEW_SMALL_INT(-1);
}
return MP_OBJ_NEW_SMALL_INT(_SECTOR_SIZE(self));
default: // unknown command
return MP_OBJ_NEW_SMALL_INT(-1); // error
}
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(machine_sdcard_ioctl_obj, machine_sdcard_ioctl);
STATIC const mp_rom_map_elem_t machine_sdcard_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_info), MP_ROM_PTR(&sd_info_obj) },
{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&sd_deinit_obj) },
{ MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&sd_deinit_obj) },
// block device protocol
{ MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&machine_sdcard_readblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&machine_sdcard_writeblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&machine_sdcard_ioctl_obj) },
};
STATIC MP_DEFINE_CONST_DICT(machine_sdcard_locals_dict, machine_sdcard_locals_dict_table);
const mp_obj_type_t machine_sdcard_type = {
{ &mp_type_type },
.name = MP_QSTR_SDCard,
.make_new = machine_sdcard_make_new,
.locals_dict = (mp_obj_dict_t *)&machine_sdcard_locals_dict,
};
#endif // MICROPY_HW_ENABLE_SDCARD
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