constants.c

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#include "constants.h"
#include "checksums.h"
static int CRC_SIZE;
 
extern uint32_t permaramadr;
 
struct consts *constants() {
  return (struct consts *)&permaramadr;
}
 
static void set_checksum() {
  uint32_t c = calc_crc32((void *)constants(), CRC_SIZE, 4);
 
  constants()->crc32 = c;
}
 
// returns true if constants were reset
int constants_init() {
  CRC_SIZE = offsetof(struct consts, end_of_checksum);
  void *v = (void *)constants();
 
  if (constants()->magic == CONSTANTS_MAGIC) {
    uint32_t c = calc_crc32(v, CRC_SIZE, 4);
    if (c == constants()->crc32) {
      return 0;
    }
  }
  memset(v, 0, sizeof(struct consts));
  constants()->magic = CONSTANTS_MAGIC;
  set_checksum();
  return 1;
}
 
// after each update to constants you *must* call this
void constants_validate() {
  if (constants()->magic != CONSTANTS_MAGIC) {
    // if it isn't magic, then just rewrite it out
    constants_init();
    return;
  }
  set_checksum();
}
 
void constants_print() {
  struct consts *c = constants();
 
  printf("Constants (checksum size: %i:\r\n", CRC_SIZE);
  if (constants()->magic != CONSTANTS_MAGIC) {
    printf("invalid constants magic\r\n");
    return;
  }
  printf("last_return_address: %p\r\n", c->last_return_address);
  printf("failing_address    : %p\r\n", c->failing_address);
  printf("CFSR               : %p\r\n", c->CFSR);
  printf("SHCSR              : %p\r\n", c->SHCSR);
  printf("MMFAR              : %p\r\n", c->MMFAR);
  printf("HFSR               : %p\r\n", c->HFSR);
  printf("BFAR               : %p\r\n", c->BFAR);
  printf("reset_counter      : %i\r\n", c->reset_counter);
  printf("in_user_app        : %i\r\n", c->in_user_app);
  uint32_t ch = calc_crc32((uint8_t *)c, CRC_SIZE, 4);
 
  if (ch == c->crc32) {
    printf("Checksum           : OK\r\n");
  } else {
    printf("Checksum           : FAIL\r\n");
  }
}