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/*
* Eeprom emulation for KL2x chips.
* (c) 2015 flabbergast
* Most of the code is from PJRC/Teensyduino (license below)
*
* Notes: Some wear-levelling is done:
* - emulating 128 bytes of eeprom; i.e. 7 bit "eeprom addresses"
* - using 2048 bytes of flash
* - new values are written consecutively into flash
* as 16bit ("eeprom address",value) pairs
* - if all 2048 bytes of flash is used, it is erased and writes
* start from the beginning again
* - the 2048 bytes of flash used are at the end of the flash
* - BEWARE: there is no protection! Use a custom .ld script
* to make sure this area is never used for code!
*/
/* Teensyduino Core Library
* http://www.pjrc.com/teensy/
* Copyright (c) 2013 PJRC.COM, LLC.
*
* 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:
*
* 1. The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* 2. If the Software is incorporated into a build system that allows
* selection among a list of target devices, then similar target
* devices manufactured by PJRC.COM must be included in the list of
* target devices and selectable in the same manner.
*
* 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 "ch.h"
#include "hal.h"
#define SYMVAL(sym) (uint32_t)(((uint8_t *)&(sym)) - ((uint8_t *)0))
extern uint32_t __eeprom_workarea_start__;
extern uint32_t __eeprom_workarea_end__;
#define EEPROM_SIZE 128
static uint32_t flashend = 0;
void eeprom_initialize(void)
{
const uint16_t *p = (uint16_t *)SYMVAL(__eeprom_workarea_start__);
do {
if (*p++ == 0xFFFF) {
flashend = (uint32_t)(p - 2);
return;
}
} while (p < (uint16_t *)SYMVAL(__eeprom_workarea_end__));
flashend = (uint32_t)((uint16_t *)SYMVAL(__eeprom_workarea_end__) - 1);
}
uint8_t eeprom_read_byte(const uint8_t *addr)
{
uint32_t offset = (uint32_t)addr;
const uint16_t *p = (uint16_t *)SYMVAL(__eeprom_workarea_start__);
const uint16_t *end = (const uint16_t *)((uint32_t)flashend);
uint16_t val;
uint8_t data=0xFF;
if (!end) {
eeprom_initialize();
end = (const uint16_t *)((uint32_t)flashend);
}
if (offset < EEPROM_SIZE) {
while (p <= end) {
val = *p++;
if ((val & 255) == offset) data = val >> 8;
}
}
return data;
}
static void flash_write(const uint16_t *code, uint32_t addr, uint32_t data)
{
// with great power comes great responsibility....
uint32_t stat;
*(uint32_t *)&(FTFA->FCCOB3) = 0x06000000 | (addr & 0x00FFFFFC);
*(uint32_t *)&(FTFA->FCCOB7) = data;
__disable_irq();
(*((void (*)(volatile uint8_t *))((uint32_t)code | 1)))(&(FTFA->FSTAT));
__enable_irq();
stat = FTFA->FSTAT & (FTFA_FSTAT_RDCOLERR|FTFA_FSTAT_ACCERR|FTFA_FSTAT_FPVIOL);
if (stat) {
FTFA->FSTAT = stat;
}
MCM->PLACR |= MCM_PLACR_CFCC;
}
void eeprom_write_byte(uint8_t *addr, uint8_t data)
{
uint32_t offset = (uint32_t)addr;
const uint16_t *p, *end = (const uint16_t *)((uint32_t)flashend);
uint32_t i, val, flashaddr;
uint16_t do_flash_cmd[] = {
0x2380, 0x7003, 0x7803, 0xb25b, 0x2b00, 0xdafb, 0x4770};
uint8_t buf[EEPROM_SIZE];
if (offset >= EEPROM_SIZE) return;
if (!end) {
eeprom_initialize();
end = (const uint16_t *)((uint32_t)flashend);
}
if (++end < (uint16_t *)SYMVAL(__eeprom_workarea_end__)) {
val = (data << 8) | offset;
flashaddr = (uint32_t)end;
flashend = flashaddr;
if ((flashaddr & 2) == 0) {
val |= 0xFFFF0000;
} else {
val <<= 16;
val |= 0x0000FFFF;
}
flash_write(do_flash_cmd, flashaddr, val);
} else {
for (i=0; i < EEPROM_SIZE; i++) {
buf[i] = 0xFF;
}
for (p = (uint16_t *)SYMVAL(__eeprom_workarea_start__); p < (uint16_t *)SYMVAL(__eeprom_workarea_end__); p++) {
val = *p;
if ((val & 255) < EEPROM_SIZE) {
buf[val & 255] = val >> 8;
}
}
buf[offset] = data;
for (flashaddr=(uint32_t)(uint16_t *)SYMVAL(__eeprom_workarea_start__); flashaddr < (uint32_t)(uint16_t *)SYMVAL(__eeprom_workarea_end__); flashaddr += 1024) {
*(uint32_t *)&(FTFA->FCCOB3) = 0x09000000 | flashaddr;
__disable_irq();
(*((void (*)(volatile uint8_t *))((uint32_t)do_flash_cmd | 1)))(&(FTFA->FSTAT));
__enable_irq();
val = FTFA->FSTAT & (FTFA_FSTAT_RDCOLERR|FTFA_FSTAT_ACCERR|FTFA_FSTAT_FPVIOL);;
if (val) FTFA->FSTAT = val;
MCM->PLACR |= MCM_PLACR_CFCC;
}
flashaddr=(uint32_t)(uint16_t *)SYMVAL(__eeprom_workarea_start__);
for (i=0; i < EEPROM_SIZE; i++) {
if (buf[i] == 0xFF) continue;
if ((flashaddr & 2) == 0) {
val = (buf[i] << 8) | i;
} else {
val = val | (buf[i] << 24) | (i << 16);
flash_write(do_flash_cmd, flashaddr, val);
}
flashaddr += 2;
}
flashend = flashaddr;
if ((flashaddr & 2)) {
val |= 0xFFFF0000;
flash_write(do_flash_cmd, flashaddr, val);
}
}
}
/*
void do_flash_cmd(volatile uint8_t *fstat)
{
*fstat = 0x80;
while ((*fstat & 0x80) == 0) ; // wait
}
00000000 <do_flash_cmd>:
0: 2380 movs r3, #128 ; 0x80
2: 7003 strb r3, [r0, #0]
4: 7803 ldrb r3, [r0, #0]
6: b25b sxtb r3, r3
8: 2b00 cmp r3, #0
a: dafb bge.n 4 <do_flash_cmd+0x4>
c: 4770 bx lr
*/
uint16_t eeprom_read_word(const uint16_t *addr)
{
const uint8_t *p = (const uint8_t *)addr;
return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8);
}
uint32_t eeprom_read_dword(const uint32_t *addr)
{
const uint8_t *p = (const uint8_t *)addr;
return eeprom_read_byte(p) | (eeprom_read_byte(p+1) << 8)
| (eeprom_read_byte(p+2) << 16) | (eeprom_read_byte(p+3) << 24);
}
void eeprom_read_block(void *buf, const void *addr, uint32_t len)
{
const uint8_t *p = (const uint8_t *)addr;
uint8_t *dest = (uint8_t *)buf;
while (len--) {
*dest++ = eeprom_read_byte(p++);
}
}
int eeprom_is_ready(void)
{
return 1;
}
void eeprom_write_word(uint16_t *addr, uint16_t value)
{
uint8_t *p = (uint8_t *)addr;
eeprom_write_byte(p++, value);
eeprom_write_byte(p, value >> 8);
}
void eeprom_write_dword(uint32_t *addr, uint32_t value)
{
uint8_t *p = (uint8_t *)addr;
eeprom_write_byte(p++, value);
eeprom_write_byte(p++, value >> 8);
eeprom_write_byte(p++, value >> 16);
eeprom_write_byte(p, value >> 24);
}
void eeprom_write_block(const void *buf, void *addr, uint32_t len)
{
uint8_t *p = (uint8_t *)addr;
const uint8_t *src = (const uint8_t *)buf;
while (len--) {
eeprom_write_byte(p++, *src++);
}
}
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