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flash.cpp
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flash.cpp
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#include "flash.hpp"
#include "globals.hpp"
#include <libopencm3/stm32/flash.h>
#include <string.h>
#include <mculib/printk.hpp>
#define FLASH_PAGE_SIZE 2048
// Use for cache config check
static uint16_t crc_cache = 0;
uint32_t flash_program_data(uint32_t dst, uint8_t *src, uint32_t bytes) {
uint32_t flash_status = 0;
// check if start_address is in proper range
if(dst < FLASH_BASE)
return -1;
// calculate current page address
if(dst % FLASH_PAGE_SIZE)
return -1;
flash_unlock();
if(FLASH_CR & FLASH_CR_LOCK) {
printk("flash_program_data: flash_unlock did not unlock hw\n");
printk("&FLASH_KEYR = 0x%x\n", (uint32_t) &FLASH_KEYR);
printk("&FLASH_CR = 0x%x\n", (uint32_t) &FLASH_CR);
printk("FLASH_CR = 0x%x\n", (uint32_t) FLASH_CR);
return -2;
}
// Erase pages
uint32_t curr = dst;
uint32_t end = dst + bytes;
while(curr < end) {
//flash_erase_page(curr);
while(FLASH_SR & FLASH_SR_BSY);
FLASH_CR |= FLASH_CR_PER;
FLASH_AR = curr;
FLASH_CR |= FLASH_CR_STRT;
while(FLASH_SR & FLASH_SR_BSY);
flash_status = FLASH_SR;
if(flash_status != FLASH_SR_EOP) {
printk("flash_program_data: erase error: flash status %d\n", flash_status);
printk("flash_program_data: while erasing page 0x%x\n", curr);
printk("flash_program_data: dst = 0x%x\n", dst);
return -2;
}
curr += FLASH_PAGE_SIZE;
}
// programming flash memory
for(uint32_t iter=0; iter<bytes; iter += 4)
{
// programming word data
uint32_t word = *(uint32_t*)(src + iter);
flash_program_word(dst+iter, word);
flash_status = flash_get_status_flags();
if(flash_status != FLASH_SR_EOP) {
printk("flash_program_data: write error: flash status %d\n", flash_status);
return -2;
}
// verify if correct data is programmed
uint32_t readback = *(volatile uint32_t*)(dst + iter);
if(readback != word) {
printk("flash_program_data: verify failed: wrote %x, read %x\n", word, readback);
return -3;
}
}
return 0;
}
static inline uint32_t __ROR(uint32_t op1, uint32_t op2) {
return (op1 >> op2) | (op1 << (32 - op2));
}
static uint32_t checksum(const void *start, size_t len) {
uint32_t *p = (uint32_t*)start;
uint32_t value = 0;
len>>=2;
while (len--)
value = __ROR(value, 31) + *p++;
return value;
}
int flash_caldata_save(int id) {
// the size of the properties structure must be an integer multiple of
// the flash word size, or else we will read past the end of the structure.
static_assert((sizeof(current_props) % 4) == 0,
"the size of the properties structure must be an integer multiple of 4");
static_assert(SAVEAREA_BYTES >= sizeof(current_props),
"SAVEAREA_BYTES is too small");
uint8_t *src = (uint8_t*)¤t_props;
uint32_t dst = SAVEAREA(id);
if (id < 0 || id >= SAVEAREA_MAX)
return -1;
current_props.magic = CONFIG_MAGIC;
current_props.checksum = checksum(¤t_props, sizeof(current_props) - 8);
int ret = flash_program_data(dst, src, sizeof(current_props));
printk("save caldata %d, ret = %d\n", id, ret);
printk("src magic: %x, dst magic = %x\n", *(uint32_t*)src, *(uint32_t*)dst);
lastsaveid = id;
crc_cache|=1<<id;
return ret;
}
int flash_caldata_recall(int id) {
const properties_t *src;
if (id < 0 || id >= SAVEAREA_MAX)
return -1;
// point to saved area on the flash memory
src = (properties_t*)SAVEAREA(id);
// Need check it
if ((crc_cache&(1<<id)) == 0){
if (src->magic != CONFIG_MAGIC) {
printk("caldata_recall: incorrect magic %x, should be %x\n", src->magic, CONFIG_MAGIC);
return -2;
}
if (checksum(src, sizeof(current_props) - 8) != src->checksum) {
printk("caldata_recall: incorrect checksum %08x\n", src->checksum);
return -3;
}
}
/* active configuration points to save data on flash memory */
lastsaveid = id;
crc_cache|=1<<id;
/* duplicated saved data onto sram to be able to modify marker/trace */
memcpy(¤t_props, src, sizeof(properties_t));
return 0;
}
const properties_t *caldata_reference(void) {
const properties_t *src = (const properties_t*)SAVEAREA(lastsaveid);
// Return cached result
if (crc_cache&(1<<lastsaveid)) return src;
if (src->magic != CONFIG_MAGIC)
return nullptr;
if (checksum(src, sizeof(current_props) - 8) != src->checksum)
return nullptr;
crc_cache|=1<<lastsaveid;
return src;
}
int flash_config_save(void) {
uint8_t* src = (uint8_t*)&config;
uint32_t dst = CONFIGAREA_BEGIN;
static_assert(CONFIGAREA_BYTES >= sizeof(config),
"CONFIGAREA_BYTES is too small");
config.magic = CONFIG_MAGIC;
config.checksum = checksum(&config, sizeof(config) - 8);
crc_cache|=1<<15;
return flash_program_data(dst, src, sizeof(config));
}
int flash_config_recall(void) {
const config_t *src = (const config_t*)CONFIGAREA_BEGIN;
void *dst = &config;
// Check cache
if ((crc_cache&(1<<15)) == 0){
if (src->magic != CONFIG_MAGIC) {
printk("config_recall: incorrect magic %x, should be %x\n", src->magic, CONFIG_MAGIC);
return -1;
}
if (checksum(src, sizeof(config) - 8) != src->checksum) {
printk("config_recall: incorrect checksum %08x\n", src->checksum);
return -2;
}
}
crc_cache|=1<<15;
/* duplicated saved data onto sram to be able to modify marker/trace */
memcpy(dst, src, sizeof(config_t));
return 0;
}
void flash_clear_user(void) {
flash_unlock();
crc_cache = 0;
// erase flash pages
uint8_t *p = (uint8_t*)USERFLASH_BEGIN;
uint8_t *tail = (uint8_t*)board::USERFLASH_END;
while (p < tail) {
flash_erase_page((uint32_t)p);
p += FLASH_PAGE_SIZE;
}
}