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Merge pull request #4272 from AnHardt/m100-rep
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Repair M100
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@thinkyhead
thinkyhead authored Jul 12, 2016
2 parents 243ad43 + 23e0134 commit 6a45aad
Showing 1 changed file with 28 additions and 35 deletions.
63 changes: 28 additions & 35 deletions Marlin/M100_Free_Mem_Chk.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -43,23 +43,23 @@
#include "Marlin.h"

#if ENABLED(M100_FREE_MEMORY_WATCHER)
extern void* __brkval;
extern char* __brkval;
extern size_t __heap_start, __heap_end, __flp;

extern char __bss_end;

//
// Utility functions used by M100 to get its work done.
//

unsigned char* top_of_stack();
char* top_of_stack();
void prt_hex_nibble(unsigned int);
void prt_hex_byte(unsigned int);
void prt_hex_word(unsigned int);
int how_many_E5s_are_here(unsigned char*);
int how_many_E5s_are_here(char*);

void gcode_M100() {
static int m100_not_initialized = 1;
unsigned char* sp, *ptr;
static bool m100_not_initialized = true;
char* sp, *ptr;
int i, j, n;
//
// M100 D dumps the free memory block from __brkval to the stack pointer.
Expand All @@ -72,19 +72,19 @@ void gcode_M100() {
//
#if ENABLED(M100_FREE_MEMORY_DUMPER) // Disable to remove Dump sub-command
if (code_seen('D')) {
ptr = (unsigned char*) __brkval;
ptr = __brkval ? __brkval : &__bss_end;
//
// We want to start and end the dump on a nice 16 byte boundry even though
// the values we are using are not 16 byte aligned.
//
SERIAL_ECHOPGM("\n__brkval : ");
SERIAL_ECHOPGM("\nbss_end : ");
prt_hex_word((unsigned int) ptr);
ptr = (unsigned char*)((unsigned long) ptr & 0xfff0);
ptr = (char*)((unsigned long) ptr & 0xfff0);
sp = top_of_stack();
SERIAL_ECHOPGM("\nStack Pointer : ");
prt_hex_word((unsigned int) sp);
SERIAL_EOL;
sp = (unsigned char*)((unsigned long) sp | 0x000f);
sp = (char*)((unsigned long) sp | 0x000f);
n = sp - ptr;
//
// This is the main loop of the Dump command.
Expand All @@ -95,21 +95,17 @@ void gcode_M100() {
for (i = 0; i < 16; i++) { // and 16 data bytes
prt_hex_byte(*(ptr + i));
SERIAL_CHAR(' ');
delay(2);
}
SERIAL_CHAR('|'); // now show where non 0xE5's are
for (i = 0; i < 16; i++) {
delay(2);
if (*(ptr + i) == 0xe5)
if (*(ptr + i) == (char)0xe5)
SERIAL_CHAR(' ');
else
SERIAL_CHAR('?');
}
SERIAL_EOL;
ptr += 16;
delay(2);
}
SERIAL_ECHOLNPGM("Done.");
return;
}
#endif
Expand All @@ -119,17 +115,17 @@ void gcode_M100() {
//
if (code_seen('F')) {
#if 0
int max_addr = (int) __brkval;
int max_addr = (int) __brkval ? __brkval : &__bss_end;
int max_cnt = 0;
#endif
int block_cnt = 0;
ptr = (unsigned char*) __brkval;
ptr = __brkval ? __brkval : &__bss_end;
sp = top_of_stack();
n = sp - ptr;
// Scan through the range looking for the biggest block of 0xE5's we can find
for (i = 0; i < n; i++) {
if (*(ptr + i) == (unsigned char) 0xe5) {
j = how_many_E5s_are_here((unsigned char*) ptr + i);
if (*(ptr + i) == (char)0xe5) {
j = how_many_E5s_are_here(ptr + i);
if (j > 8) {
SERIAL_ECHOPAIR("Found ", j);
SERIAL_ECHOPGM(" bytes free at 0x");
Expand All @@ -148,7 +144,6 @@ void gcode_M100() {
}
if (block_cnt > 1)
SERIAL_ECHOLNPGM("\nMemory Corruption detected in free memory area.");
SERIAL_ECHOLNPGM("\nDone.");
return;
}
//
Expand All @@ -159,8 +154,8 @@ void gcode_M100() {
if (code_seen('C')) {
int x = code_value_int(); // x gets the # of locations to corrupt within the memory pool
SERIAL_ECHOLNPGM("Corrupting free memory block.\n");
ptr = (unsigned char*) __brkval;
SERIAL_ECHOPAIR("\n__brkval : ", ptr);
ptr = __brkval ? __brkval : &__bss_end;
SERIAL_ECHOPAIR("\nbss_end : ", ptr);
ptr += 8;
sp = top_of_stack();
SERIAL_ECHOPAIR("\nStack Pointer : ", sp);
Expand All @@ -181,10 +176,10 @@ void gcode_M100() {
// M100 I Initializes the free memory pool so it can be watched and prints vital
// statistics that define the free memory pool.
//
if (m100_not_initialized || code_seen('I')) { // If no sub-command is specified, the first time
SERIAL_ECHOLNPGM("Initializing free memory block.\n"); // this happens, it will Initialize.
ptr = (unsigned char*) __brkval; // Repeated M100 with no sub-command will not destroy the
SERIAL_ECHOPAIR("\n__brkval : ", ptr); // state of the initialized free memory pool.
if (m100_not_initialized || code_seen('I')) { // If no sub-command is specified, the first time
SERIAL_ECHOLNPGM("Initializing free memory block.\n"); // this happens, it will Initialize.
ptr = __brkval ? __brkval : &__bss_end; // Repeated M100 with no sub-command will not destroy the
SERIAL_ECHOPAIR("\nbss_end : ", ptr); // state of the initialized free memory pool.
ptr += 8;
sp = top_of_stack();
SERIAL_ECHOPAIR("\nStack Pointer : ", sp);
Expand All @@ -194,16 +189,15 @@ void gcode_M100() {
SERIAL_ECHO(n);
SERIAL_ECHOLNPGM(" bytes of memory initialized.\n");
for (i = 0; i < n; i++)
*(ptr + i) = (unsigned char) 0xe5;
*(ptr + i) = (char)0xe5;
for (i = 0; i < n; i++) {
if (*(ptr + i) != (unsigned char) 0xe5) {
if (*(ptr + i) != (char)0xe5) {
SERIAL_ECHOPAIR("? address : ", ptr + i);
SERIAL_ECHOPAIR("=", *(ptr + i));
SERIAL_ECHOLNPGM("\n");
}
}
m100_not_initialized = 0;
SERIAL_ECHOLNPGM("Done.\n");
m100_not_initialized = false;
return;
}
return;
Expand All @@ -212,8 +206,8 @@ void gcode_M100() {
// top_of_stack() returns the location of a variable on its stack frame. The value returned is above
// the stack once the function returns to the caller.

unsigned char* top_of_stack() {
unsigned char x;
char* top_of_stack() {
char x;
return &x + 1; // x is pulled on return;
}

Expand All @@ -226,7 +220,6 @@ void prt_hex_nibble(unsigned int n) {
SERIAL_ECHO(n);
else
SERIAL_ECHO((char)('A' + n - 10));
delay(2);
}

void prt_hex_byte(unsigned int b) {
Expand All @@ -242,10 +235,10 @@ void prt_hex_word(unsigned int w) {
// how_many_E5s_are_here() is a utility function to easily find out how many 0xE5's are
// at the specified location. Having this logic as a function simplifies the search code.
//
int how_many_E5s_are_here(unsigned char* p) {
int how_many_E5s_are_here(char* p) {
int n;
for (n = 0; n < 32000; n++) {
if (*(p + n) != (unsigned char) 0xe5)
if (*(p + n) != (char)0xe5)
return n - 1;
}
return -1;
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