arduino/esp8266
1
0
Fork 0
mirror of https://github.com/esp8266/Arduino.git synced 2025-07-27 18:02:17 +03:00
Code Activity

reading eboot commands via RTC, flash erase/copy

Browse Source
This commit is contained in:
Ivan Grokhotkov
2015-06-01 02:08:48 +03:00
parent 6387005c7f
commit d5b578b161
6 changed files with 174 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
bootloaders/eboot/eboot_command.c Normal file
View File

@ -0,0 +1,47 @@
#include "eboot_command.h"
uint32_t crc_update(uint32_t crc, const uint8_t *data, size_t length)
{
uint32_t i;
bool bit;
uint8_t c;
while (length--) {
c = *data++;
for (i = 0x80; i > 0; i >>= 1) {
bit = crc & 0x80000000;
if (c & i) {
bit = !bit;
}
crc <<= 1;
if (bit) {
crc ^= 0x04c11db7;
}
}
}
return crc;
}
uint32_t eboot_command_calculate_crc32(const struct eboot_command* cmd)
{
return crc_update(0xffffffff, (const uint8_t*) cmd,
offsetof(struct eboot_command, crc32));
}
void eboot_command_read(struct eboot_command* cmd)
{
const uint32_t dw_count = sizeof(struct eboot_command) / sizeof(uint32_t);
uint32_t* dst = (uint32_t *) cmd;
for (uint32_t i = 0; i < dw_count; ++i) {
dst[i] = RTC_MEM[i];
}
uint32_t crc32 = eboot_command_calculate_crc32(cmd);
if (cmd->magic & EBOOT_MAGIC_MASK != EBOOT_MAGIC ||
cmd->crc32 != crc32) {
cmd->action = ACTION_LOAD_APP;
cmd->args[0] = 0;
}
}