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Diffstat (limited to 'drivers/memory/spiflash.c')
-rw-r--r--drivers/memory/spiflash.c200
1 files changed, 0 insertions, 200 deletions
diff --git a/drivers/memory/spiflash.c b/drivers/memory/spiflash.c
deleted file mode 100644
index 214610e0a..000000000
--- a/drivers/memory/spiflash.c
+++ /dev/null
@@ -1,200 +0,0 @@
-/*
- * This file is part of the MicroPython project, http://micropython.org/
- *
- * The MIT License (MIT)
- *
- * Copyright (c) 2016-2017 Damien P. George
- *
- * 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 <stdio.h>
-#include <string.h>
-
-#include "py/mperrno.h"
-#include "py/mphal.h"
-#include "extmod/machine_spi.h"
-#include "drivers/memory/spiflash.h"
-
-#define CMD_WRITE (0x02)
-#define CMD_READ (0x03)
-#define CMD_WRDI (0x04)
-#define CMD_RDSR (0x05)
-#define CMD_WREN (0x06)
-#define CMD_SEC_ERASE (0x20)
-#define WAIT_SR_TIMEOUT (1000000)
-
-#define PAGE_SIZE (256) // maximum bytes we can write in one SPI transfer
-#define SECTOR_SIZE (4096) // size of erase sector
-
-// Note: this code is not reentrant with this shared buffer
-STATIC uint8_t buf[SECTOR_SIZE];
-
-void mp_spiflash_init(mp_spiflash_t *self) {
- mp_hal_pin_write(self->cs, 1);
- mp_hal_pin_output(self->cs);
- mp_hal_pin_write(self->spi.sck, 0);
- mp_hal_pin_output(self->spi.sck);
- mp_hal_pin_output(self->spi.mosi);
- mp_hal_pin_input(self->spi.miso);
-}
-
-STATIC void mp_spiflash_acquire_bus(mp_spiflash_t *self) {
- // can be used for actions needed to acquire bus
- (void)self;
-}
-
-STATIC void mp_spiflash_release_bus(mp_spiflash_t *self) {
- // can be used for actions needed to release bus
- (void)self;
-}
-
-STATIC void mp_spiflash_transfer(mp_spiflash_t *self, size_t len, const uint8_t *src, uint8_t *dest) {
- mp_machine_soft_spi_transfer(&self->spi.base, len, src, dest);
-}
-
-STATIC int mp_spiflash_wait_sr(mp_spiflash_t *self, uint8_t mask, uint8_t val, uint32_t timeout) {
- uint8_t cmd[1] = {CMD_RDSR};
- mp_hal_pin_write(self->cs, 0);
- mp_spiflash_transfer(self, 1, cmd, NULL);
- for (; timeout; --timeout) {
- mp_spiflash_transfer(self, 1, cmd, cmd);
- if ((cmd[0] & mask) == val) {
- break;
- }
- }
- mp_hal_pin_write(self->cs, 1);
- if ((cmd[0] & mask) == val) {
- return 0; // success
- } else if (timeout == 0) {
- return -MP_ETIMEDOUT;
- } else {
- return -MP_EIO;
- }
-}
-
-STATIC int mp_spiflash_wait_wel1(mp_spiflash_t *self) {
- return mp_spiflash_wait_sr(self, 2, 2, WAIT_SR_TIMEOUT);
-}
-
-STATIC int mp_spiflash_wait_wip0(mp_spiflash_t *self) {
- return mp_spiflash_wait_sr(self, 1, 0, WAIT_SR_TIMEOUT);
-}
-
-STATIC void mp_spiflash_write_cmd(mp_spiflash_t *self, uint8_t cmd) {
- mp_hal_pin_write(self->cs, 0);
- mp_spiflash_transfer(self, 1, &cmd, NULL);
- mp_hal_pin_write(self->cs, 1);
-}
-
-STATIC int mp_spiflash_erase_sector(mp_spiflash_t *self, uint32_t addr) {
- // enable writes
- mp_spiflash_write_cmd(self, CMD_WREN);
-
- // wait WEL=1
- int ret = mp_spiflash_wait_wel1(self);
- if (ret != 0) {
- return ret;
- }
-
- // erase the sector
- mp_hal_pin_write(self->cs, 0);
- uint8_t cmd[4] = {CMD_SEC_ERASE, addr >> 16, addr >> 8, addr};
- mp_spiflash_transfer(self, 4, cmd, NULL);
- mp_hal_pin_write(self->cs, 1);
-
- // wait WIP=0
- return mp_spiflash_wait_wip0(self);
-}
-
-STATIC int mp_spiflash_write_page(mp_spiflash_t *self, uint32_t addr, const uint8_t *src) {
- // enable writes
- mp_spiflash_write_cmd(self, CMD_WREN);
-
- // wait WEL=1
- int ret = mp_spiflash_wait_wel1(self);
- if (ret != 0) {
- return ret;
- }
-
- // write the page
- mp_hal_pin_write(self->cs, 0);
- uint8_t cmd[4] = {CMD_WRITE, addr >> 16, addr >> 8, addr};
- mp_spiflash_transfer(self, 4, cmd, NULL);
- mp_spiflash_transfer(self, PAGE_SIZE, src, NULL);
- mp_hal_pin_write(self->cs, 1);
-
- // wait WIP=0
- return mp_spiflash_wait_wip0(self);
-}
-
-void mp_spiflash_read(mp_spiflash_t *self, uint32_t addr, size_t len, uint8_t *dest) {
- mp_spiflash_acquire_bus(self);
- uint8_t cmd[4] = {CMD_READ, addr >> 16, addr >> 8, addr};
- mp_hal_pin_write(self->cs, 0);
- mp_spiflash_transfer(self, 4, cmd, NULL);
- mp_spiflash_transfer(self, len, dest, dest);
- mp_hal_pin_write(self->cs, 1);
- mp_spiflash_release_bus(self);
-}
-
-int mp_spiflash_write(mp_spiflash_t *self, uint32_t addr, size_t len, const uint8_t *src) {
- // TODO optimise so we don't need to erase multiple times for successive writes to a sector
-
- // align to 4096 sector
- uint32_t offset = addr & 0xfff;
- addr = (addr >> 12) << 12;
-
- // restriction for now, so we don't need to erase multiple pages
- if (offset + len > sizeof(buf)) {
- printf("mp_spiflash_write: len is too large\n");
- return -MP_EIO;
- }
-
- mp_spiflash_acquire_bus(self);
-
- // read sector
- uint8_t cmd[4] = {CMD_READ, addr >> 16, addr >> 8, addr};
- mp_hal_pin_write(self->cs, 0);
- mp_spiflash_transfer(self, 4, cmd, NULL);
- mp_spiflash_transfer(self, SECTOR_SIZE, buf, buf);
- mp_hal_pin_write(self->cs, 1);
-
- // erase sector
- int ret = mp_spiflash_erase_sector(self, addr);
- if (ret != 0) {
- mp_spiflash_release_bus(self);
- return ret;
- }
-
- // copy new block into buffer
- memcpy(buf + offset, src, len);
-
- // write sector in pages of 256 bytes
- for (int i = 0; i < SECTOR_SIZE; i += 256) {
- ret = mp_spiflash_write_page(self, addr + i, buf + i);
- if (ret != 0) {
- mp_spiflash_release_bus(self);
- return ret;
- }
- }
-
- mp_spiflash_release_bus(self);
- return 0; // success
-}
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