crc library from arduino to energia - need help to conwert

[WarEnd 0]

arduino crc code:

 

 

#include <avr/pgmspace.h>

static PROGMEM prog_uint32_t crc_table[16] = {
    0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
    0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
    0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
    0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};

unsigned long crc_update(unsigned long crc, byte data)
{
    byte tbl_idx;
    tbl_idx = crc ^ (data >> (0 * 4));
    crc = pgm_read_dword_near(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
    tbl_idx = crc ^ (data >> (1 * 4));
    crc = pgm_read_dword_near(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
    return crc;
}

unsigned long crc_string(char *s)
{
  unsigned long crc = ~0L;
  while (*s)
    crc = crc_update(crc, *s++);
  crc = ~crc;
  return crc;
}

void setup()
{
  Serial.begin(9600);
  Serial.println(crc_string("HELLO"), HEX);
}

void loop()
{
  
}

 

Please help to replace avr/pgmspace.h to energia working method. Sorry for my english

[energia 485]

Here you go:

 

static uint32_t crc_table[16] = {
    0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
    0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
    0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
    0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
};

unsigned long crc_update(unsigned long crc, byte data)
{
    byte tbl_idx;
    tbl_idx = crc ^ (data >> (0 * 4));
    crc = *(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
    tbl_idx = crc ^ (data >> (1 * 4));
    crc = *(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
    return crc;
}

unsigned long crc_string(const char *s)
{
  unsigned long crc = ~0L;
  while (*s)
    crc = crc_update(crc, *s++);
  crc = ~crc;
  return crc;
}

void setup()
{
  Serial.begin(9600);
  Serial.println(crc_string("HELLO"), HEX);
}

void loop()
{
  
}

[energia 485]

And this is the diff:

 

@@ -1,6 +1,5 @@
-#include <avr/pgmspace.h>
 
-static PROGMEM prog_uint32_t crc_table[16] = {
+static uint32_t crc_table[16] = {
     0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
     0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
     0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
@@ -11,13 +10,13 @@
 {
     byte tbl_idx;
     tbl_idx = crc ^ (data >> (0 * 4));
-    crc = pgm_read_dword_near(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
+    crc = *(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
     tbl_idx = crc ^ (data >> (1 * 4));
-    crc = pgm_read_dword_near(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
+    crc = *(crc_table + (tbl_idx & 0x0f)) ^ (crc >> 4);
     return crc;
 }
 
-unsigned long crc_string(char *s)
+unsigned long crc_string(const char *s)
 {
   unsigned long crc = ~0L;
   while (*s)

[WarEnd 0]

Thank you working :)

[Edward Chen 0]

Excuse me,

what is this code for?

i'm just curious

[WarEnd 0]

A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. Blocks of data entering these systems get a short check value attached, based on the remainder of a polynomial division of their contents; on retrieval the calculation is repeated, and corrective action can be taken against presumed data corruption if the check values do not match.

[roadrunner84 466]

Yes, but why do you need it in your msp430?