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samd_spiflash.c
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019-2020 Peter Hinch
* Copyright (c) 2023 Robert Hammelrath
*
* 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 <stdint.h>
#include "py/obj.h"
#include "py/runtime.h"
#include "py/mphal.h"
#include "extmod/modmachine.h"
#include "extmod/vfs.h"
#include "pin_af.h"
#if MICROPY_HW_SPIFLASH
#define _READ_INDEX (0)
#define _PROGRAM_PAGE_INDEX (1)
#define _SECTOR_ERASE_INDEX (2)
const uint8_t _COMMANDS_24BIT[] = {0x03, 0x02, 0x20}; // READ, PROGRAM_PAGE, ERASE_4K
const uint8_t _COMMANDS_32BIT[] = {0x13, 0x12, 0x21}; // READ, PROGRAM_PAGE, ERASE_4K
#define COMMAND_JEDEC_ID (0x9F)
#define COMMAND_READ_STATUS (0x05)
#define COMMAND_WRITE_ENABLE (0x06)
#define COMMAND_READ_SFDP (0x5A)
#define PAGE_SIZE (256)
#define SECTOR_SIZE (4096)
#ifndef MICROPY_HW_SPIFLASH_BAUDRATE
#define MICROPY_HW_SPIFLASH_BAUDRATE (24000000)
#endif
typedef struct _spiflash_obj_t {
mp_obj_base_t base;
mp_obj_base_t *spi;
mp_hal_pin_obj_t cs;
bool addr_is_32bit;
uint16_t pagesize;
uint16_t sectorsize;
const uint8_t *commands;
uint32_t size;
} spiflash_obj_t;
extern const mp_obj_type_t samd_spiflash_type;
// The SPIflash object is a singleton
static spiflash_obj_t spiflash_obj = {
{ &samd_spiflash_type }, NULL, 0, false, PAGE_SIZE, SECTOR_SIZE, NULL, 0
};
static void spi_transfer(mp_obj_base_t *spi, size_t len, const uint8_t *src, uint8_t *dest) {
mp_machine_spi_p_t *spi_p = (mp_machine_spi_p_t *)MP_OBJ_TYPE_GET_SLOT(spi->type, protocol);
spi_p->transfer(spi, len, src, dest);
}
static void wait(spiflash_obj_t *self) {
uint8_t msg[2];
uint32_t timeout = 100000;
// each loop takes at least about 5us @ 120Mhz. So a timeout of
// 100000 wait 500ms max. at 120Mhz. Sector erase lasts about
// 100ms worst case, page write is < 1ms.
do {
msg[0] = COMMAND_READ_STATUS;
mp_hal_pin_write(self->cs, 0);
spi_transfer((mp_obj_base_t *)self->spi, 2, msg, msg);
mp_hal_pin_write(self->cs, 1);
} while (msg[1] != 0 && timeout-- > 0);
}
static void get_id(spiflash_obj_t *self, uint8_t id[3]) {
uint8_t msg[1];
msg[0] = COMMAND_JEDEC_ID;
mp_hal_pin_write(self->cs, 0);
spi_transfer(self->spi, 1, msg, NULL);
spi_transfer(self->spi, 3, id, id);
mp_hal_pin_write(self->cs, 1);
}
static void write_addr(spiflash_obj_t *self, uint8_t cmd, uint32_t addr) {
uint8_t msg[5];
uint8_t index = 1;
msg[0] = cmd;
if (self->addr_is_32bit) {
msg[index++] = addr >> 24;
}
msg[index++] = (addr >> 16) & 0xff;
msg[index++] = (addr >> 8) & 0xff;
msg[index++] = addr & 0xff;
mp_hal_pin_write(self->cs, 0);
spi_transfer(self->spi, self->addr_is_32bit ? 5 : 4, msg, msg);
}
static void write_enable(spiflash_obj_t *self) {
uint8_t msg[1];
msg[0] = COMMAND_WRITE_ENABLE;
mp_hal_pin_write(self->cs, 0);
spi_transfer(self->spi, 1, msg, NULL);
mp_hal_pin_write(self->cs, 1);
}
static void get_sfdp(spiflash_obj_t *self, uint32_t addr, uint8_t *buffer, int size) {
uint8_t dummy[1];
write_addr(self, COMMAND_READ_SFDP, addr);
spi_transfer(self->spi, 1, dummy, NULL);
spi_transfer(self->spi, size, buffer, buffer);
mp_hal_pin_write(self->cs, 1);
}
static mp_obj_t spiflash_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
mp_arg_check_num(n_args, n_kw, 0, 0, false);
// Set up the object
spiflash_obj_t *self = &spiflash_obj;
mp_obj_t spi_args[] = {
MP_OBJ_NEW_SMALL_INT(MICROPY_HW_SPIFLASH_ID),
MP_OBJ_NEW_SMALL_INT(MICROPY_HW_SPIFLASH_BAUDRATE),
MP_OBJ_NEW_QSTR(MP_QSTR_mosi), MP_OBJ_NEW_QSTR(MP_QSTR_FLASH_MOSI),
MP_OBJ_NEW_QSTR(MP_QSTR_miso), MP_OBJ_NEW_QSTR(MP_QSTR_FLASH_MISO),
MP_OBJ_NEW_QSTR(MP_QSTR_sck), MP_OBJ_NEW_QSTR(MP_QSTR_FLASH_SCK),
};
self->spi = MP_OBJ_TYPE_GET_SLOT(&machine_spi_type, make_new)((mp_obj_t)&machine_spi_type, 2, 3, spi_args);
mp_obj_t pin_args[] = {
MP_OBJ_NEW_QSTR(MP_QSTR_FLASH_CS),
MP_ROM_INT(1),
};
machine_pin_obj_t *cs = MP_OBJ_TYPE_GET_SLOT(&machine_pin_type, make_new)((mp_obj_t)&machine_pin_type, 2, 0, pin_args);
self->cs = cs->pin_id;
mp_hal_pin_write(self->cs, 1);
wait(self);
// Get the flash size from the device ID (default)
uint8_t id[3];
get_id(self, id);
if (id[1] == 0x84 && id[2] == 1) { // Adesto
self->size = 512 * 1024;
} else if (id[1] == 0x1f && id[2] == 1) { // Atmel / Renesas
self->size = 1024 * 1024;
} else {
self->size = 1 << id[2];
}
// Get the addr_is_32bit flag and the sector size
uint8_t buffer[128];
get_sfdp(self, 0, buffer, 16); // get the header
int len = MIN(buffer[11] * 4, sizeof(buffer));
if (len >= 29) {
int addr = buffer[12] + (buffer[13] << 8) + (buffer[14] << 16);
get_sfdp(self, addr, buffer, len); // Get the JEDEC mandatory table
self->sectorsize = 1 << buffer[28];
self->addr_is_32bit = ((buffer[2] >> 1) & 0x03) != 0;
}
self->commands = self->addr_is_32bit ? _COMMANDS_32BIT : _COMMANDS_24BIT;
return self;
}
static mp_obj_t spiflash_read(spiflash_obj_t *self, uint32_t addr, uint8_t *dest, uint32_t len) {
if (len > 0) {
write_addr(self, self->commands[_READ_INDEX], addr);
spi_transfer(self->spi, len, dest, dest);
mp_hal_pin_write(self->cs, 1);
}
return mp_const_none;
}
static mp_obj_t spiflash_write(spiflash_obj_t *self, uint32_t addr, uint8_t *src, uint32_t len) {
uint32_t length = len;
uint32_t pos = 0;
uint8_t *buf = src;
while (pos < length) {
uint16_t maxsize = self->pagesize - pos % self->pagesize;
uint16_t size = (length - pos) > maxsize ? maxsize : length - pos;
write_enable(self);
write_addr(self, self->commands[_PROGRAM_PAGE_INDEX], addr);
spi_transfer(self->spi, size, buf + pos, NULL);
mp_hal_pin_write(self->cs, 1);
wait(self);
addr += size;
pos += size;
}
return mp_const_none;
}
static mp_obj_t spiflash_erase(spiflash_obj_t *self, uint32_t addr) {
write_enable(self);
write_addr(self, self->commands[_SECTOR_ERASE_INDEX], addr);
mp_hal_pin_write(self->cs, 1);
wait(self);
return mp_const_none;
}
static mp_obj_t spiflash_readblocks(size_t n_args, const mp_obj_t *args) {
spiflash_obj_t *self = MP_OBJ_TO_PTR(args[0]);
uint32_t offset = (mp_obj_get_int(args[1]) * self->sectorsize);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_WRITE);
if (n_args == 4) {
offset += mp_obj_get_int(args[3]);
}
// Read data to flash (adf4 API)
spiflash_read(self, offset, bufinfo.buf, bufinfo.len);
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(spiflash_readblocks_obj, 3, 4, spiflash_readblocks);
static mp_obj_t spiflash_writeblocks(size_t n_args, const mp_obj_t *args) {
spiflash_obj_t *self = MP_OBJ_TO_PTR(args[0]);
uint32_t offset = (mp_obj_get_int(args[1]) * self->sectorsize);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[2], &bufinfo, MP_BUFFER_READ);
if (n_args == 3) {
spiflash_erase(self, offset);
// TODO check return value
} else {
offset += mp_obj_get_int(args[3]);
}
// Write data to flash (adf4 API)
spiflash_write(self, offset, bufinfo.buf, bufinfo.len);
// TODO check return value
return mp_const_none;
}
static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(spiflash_writeblocks_obj, 3, 4, spiflash_writeblocks);
static mp_obj_t spiflash_ioctl(mp_obj_t self_in, mp_obj_t cmd_in, mp_obj_t arg_in) {
spiflash_obj_t *self = MP_OBJ_TO_PTR(self_in);
mp_int_t cmd = mp_obj_get_int(cmd_in);
switch (cmd) {
case MP_BLOCKDEV_IOCTL_INIT:
return MP_OBJ_NEW_SMALL_INT(0);
case MP_BLOCKDEV_IOCTL_DEINIT:
return MP_OBJ_NEW_SMALL_INT(0);
case MP_BLOCKDEV_IOCTL_SYNC:
return MP_OBJ_NEW_SMALL_INT(0);
case MP_BLOCKDEV_IOCTL_BLOCK_COUNT:
return MP_OBJ_NEW_SMALL_INT(self->size / self->sectorsize);
case MP_BLOCKDEV_IOCTL_BLOCK_SIZE:
return MP_OBJ_NEW_SMALL_INT(self->sectorsize);
case MP_BLOCKDEV_IOCTL_BLOCK_ERASE: {
spiflash_erase(self, mp_obj_get_int(arg_in) * self->sectorsize);
// TODO check return value
return MP_OBJ_NEW_SMALL_INT(0);
}
default:
return mp_const_none;
}
}
static MP_DEFINE_CONST_FUN_OBJ_3(spiflash_ioctl_obj, spiflash_ioctl);
static const mp_rom_map_elem_t spiflash_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_readblocks), MP_ROM_PTR(&spiflash_readblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_writeblocks), MP_ROM_PTR(&spiflash_writeblocks_obj) },
{ MP_ROM_QSTR(MP_QSTR_ioctl), MP_ROM_PTR(&spiflash_ioctl_obj) },
};
static MP_DEFINE_CONST_DICT(spiflash_locals_dict, spiflash_locals_dict_table);
MP_DEFINE_CONST_OBJ_TYPE(
samd_spiflash_type,
MP_QSTR_Flash,
MP_TYPE_FLAG_NONE,
make_new, spiflash_make_new,
locals_dict, &spiflash_locals_dict
);
#endif // #if MICROPY_HW_SPIFLASH