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stm32_flash.c
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stm32_flash.c
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/*
* stm32_flash.c
*
* Created on: 29.05.2019
* Author: andru
*/
#include <stdint.h>
#include <string.h>
#include "ch.h"
#include "hal.h"
#include "stm32_flash.h"
#include "hal_flash_lld.h"
#include "crc8.h"
static flash_info_t flashInfo;
static uint16_t record_len;
// erase flash page
static bool pageErase(uint8_t pageno) {
BaseFlash *fp = getBaseFlash(&FD1);
if (fp->state == FLASH_READ)
fp->state = FLASH_READY;
if ((flashStartEraseSector(fp, pageno) == FLASH_NO_ERROR) &&
(flashWaitErase(fp) == FLASH_NO_ERROR)) {
return true;
}
return false;
}
// erase all flash pages
bool flashErase(void) {
for (uint16_t i=0; i < NUMPAGES; i++) {
if (!pageErase(flashInfo.pages[i].pageno))
return false;
}
return true;
}
// verify erased record on flash
static bool verifyRecord(uint8_t page, uint16_t record) {
BaseFlash *fp = getBaseFlash(&FD1);
const flash_descriptor_t *descriptor = flashGetDescriptor(fp);
uint8_t rec[record_len];
uint32_t offset = flashInfo.pages[page].pageno * descriptor->page_size + record * record_len;
if (flashRead(fp, offset, record_len, rec) != FLASH_NO_ERROR) {
return false;
}
for (uint16_t i=0; i < record_len; i++) {
if (rec[i] != 0xFF) return false;
}
return true;
}
// init flash info structure
bool initFlashInfo(void) {
BaseFlash *fp = getBaseFlash(&FD1);
const flash_descriptor_t *descriptor = flashGetDescriptor(fp);
record_len = (RECORDLEN % 4 > 0) ? (RECORDLEN / 4 * 4 + 4) : RECORDLEN;
flashInfo.last_id = 0;
flashInfo.records_on_page = descriptor->page_size / record_len;
for (uint8_t i=NUMPAGES; i > 0; i--) {
flashInfo.pages[NUMPAGES-i].pageno = descriptor->sectors_count - i;
flashInfo.pages[NUMPAGES-i].state = PAGE_UNDEF;
}
uint8_t rec[RECORDLEN];
for (uint8_t i=0; i < NUMPAGES; i++) {
for (uint16_t j=0; j < flashInfo.records_on_page; j++) {
uint32_t offset = flashInfo.pages[i].pageno * descriptor->page_size + j * record_len;
if (flashRead(fp, offset, record_len, rec) != FLASH_NO_ERROR) {
return false;
}
flash_record_t *recp = (flash_record_t *) rec;
if (!(recp->magic == MAGIC && recp->crc == CRC8(rec, RECORDLEN-1))) {
if (j == 0) {
// no records on page
if (flashVerifyErase(fp, flashInfo.pages[i].pageno) == FLASH_NO_ERROR) {
flashInfo.pages[i].state = PAGE_ERASED;
flashInfo.pages[i].last_record = 0;
flashInfo.pages[i].recordid = 0;
break;
} else {
if (pageErase(flashInfo.pages[i].pageno)) {
flashInfo.pages[i].state = PAGE_ERASED;
flashInfo.pages[i].last_record = 0;
flashInfo.pages[i].recordid = 0;
break;
} else {
return false;
}
}
}
break;
} else {
flashInfo.pages[i].state = PAGE_VALID;
flashInfo.pages[i].last_record = j;
flashInfo.pages[i].recordid = recp->id;
if (flashInfo.last_id < recp->id) {
flashInfo.active_page = i;
flashInfo.last_id = recp->id;
}
}
}
}
if (flashInfo.last_id > 0) {
flashInfo.pages[flashInfo.active_page].state = PAGE_RECEIVED;
return true;
}
for (uint8_t i=0; i<NUMPAGES; i++) {
if (flashInfo.pages[i].state == PAGE_ERASED) {
flashInfo.pages[i].state = PAGE_RECEIVED;
flashInfo.active_page = i;
return true;
}
}
return false;
}
// read data from flash record
bool readFlash(uint8_t *data) {
BaseFlash *fp = getBaseFlash(&FD1);
const flash_descriptor_t *descriptor = flashGetDescriptor(fp);
uint8_t page = flashInfo.active_page;
if (flashInfo.pages[page].state != PAGE_RECEIVED) return false;
uint8_t rec[record_len];
uint32_t offset = flashInfo.pages[page].pageno * descriptor->page_size +
flashInfo.pages[page].last_record * record_len;
if (flashRead(fp, offset, record_len, rec) != FLASH_NO_ERROR) {
return false;
}
flash_record_t *recp = (flash_record_t *) rec;
if (!(recp->magic == MAGIC && recp->crc == CRC8(rec, RECORDLEN-1))) {
return false;
}
memcpy(data, recp->data, DATALEN);
return true;
}
// write data to record on flash
bool writeFlash(uint8_t *data) {
BaseFlash *fp = getBaseFlash(&FD1);
const flash_descriptor_t *descriptor = flashGetDescriptor(fp);
uint8_t last_page = flashInfo.active_page;
if (flashInfo.pages[last_page].state != PAGE_RECEIVED) return false;
uint8_t next_page;
uint16_t next_rec;
uint16_t next_id = flashInfo.last_id + 1;
bool found = false;
for (uint8_t i=0; i<NUMPAGES; i++) {
if (flashInfo.pages[i].state == PAGE_VALID) {
next_page = i;
next_rec = flashInfo.pages[i].last_record + 1;
if (next_rec < flashInfo.records_on_page) {
found = true;
break;
}
if (pageErase(flashInfo.pages[next_page].pageno)) {
found = true;
flashInfo.pages[next_page].state = PAGE_ERASED;
flashInfo.pages[next_page].last_record = 0;
flashInfo.pages[next_page].recordid = 0;
next_rec = 0;
break;
}
}
}
if (!found) {
for (uint8_t i=0; i<NUMPAGES; i++) {
if (flashInfo.pages[i].state == PAGE_ERASED) {
next_page = i;
next_rec = 0;
found = true;
break;
}
}
}
if (!found) return false;
if (!verifyRecord(next_page, next_rec)) {
if (!pageErase(flashInfo.pages[next_page].pageno))
return false;
flashInfo.pages[next_page].state = PAGE_ERASED;
flashInfo.pages[next_page].last_record = 0;
flashInfo.pages[next_page].recordid = 0;
next_rec = 0;
}
flash_record_t rec;
rec.id = next_id;
rec.magic = MAGIC;
memcpy(rec.data, data, DATALEN);
uint8_t crc = CRC8((uint8_t *) &rec, RECORDLEN-1);
rec.crc = crc;
uint32_t offset = flashInfo.pages[next_page].pageno * descriptor->page_size +
next_rec * record_len;
if (flashProgram(fp, offset, record_len, (uint8_t *) &rec) == FLASH_NO_ERROR) {
flashInfo.pages[last_page].state = PAGE_VALID;
flashInfo.pages[next_page].state = PAGE_RECEIVED;
flashInfo.pages[next_page].recordid = next_id;
flashInfo.pages[next_page].last_record = next_rec;
flashInfo.active_page = next_page;
flashInfo.last_id = next_id;
return true;
}
return false;
}