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/Designs/Measuring_instruments/AWS01A/SW/PIC16F887/bootloader887/bloader.c |
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/**** BootLoader for PIC16F887 |
Ussage: |
ascii-xfr -s -v -l 100 ./bltest.hex > /dev/ttyUSB0 |
*/ |
#define ID "$Id$" |
#CASE // Case sensitive compiler |
#define FLASH_BLOCK_SIZE getenv("FLASH_ERASE_SIZE")/2 // Minimal length of Flash Block Size |
#define RESERVED_BLOCKS 53 // Number of reserved flash blocks for BootLoader |
#define LOADER_RESERVED (getenv("PROGRAM_MEMORY")-(RESERVED_BLOCKS*FLASH_BLOCK_SIZE)) // begining of BootLoader |
#define BUFFER_LEN_LOD 46 // Length of Working buffer for HEX |
#define ERR_BUFFER_OVERRUN 1 // Error 1 - Buffer Overrun |
#define ERR_CHECKSUM 2 // Error 2 - Bad CheckSum |
#define ERR_TOO_MANY_BYTES 3 // Error 3 - Too many bytes in one line |
#define ERR_UNSUPORTED_LINETYPE 4 // Error 4 - Unsuported Line type |
#include "bloader.h" |
#include <string.h> |
#INT_RDA |
void rs232_handler() // Test of interrupt |
{ |
putchar(getc()); // Just echo for test |
} |
void welcome(void) // Welcome message |
{ |
char REV[50]=ID; // Buffer for concatenate of a version string |
if (REV[strlen(REV)-1]=='$') REV[strlen(REV)-1]=0; |
printf("\r\n\r\n# BLoader 887 (C) 2013 KAKL\r\n"); // Welcome message |
printf("#%s\r\n",&REV[4]); |
} |
/*-------------------------------- MAIN --------------------------------------*/ |
#SEPARATE |
void real_main() // Main of loaded program |
{ |
int8 i=0; |
i=rs232_errors; // Just for compiler pleasure (supress Warning) |
welcome(); |
printf("# Reserved: %Lu\r\n", RESERVED_BLOCKS*FLASH_BLOCK_SIZE); |
printf("# FLASH_ERASE_SIZE: %Lu\r\n",getenv("FLASH_ERASE_SIZE")); |
printf("# FLASH_WRITE_SIZE: %Lu\r\n",getenv("FLASH_WRITE_SIZE")); |
printf("# Boot Loader Test >>>\r\n# "); |
enable_interrupts(INT_RDA); |
enable_interrupts(GLOBAL); |
while(TRUE) |
{ |
printf("%u|",i++); // Do something |
delay_ms(100); |
} |
} |
/*------------------- BOOT LOADER --------------------------------------------*/ |
#BUILD(INTERRUPT=FLASH_BLOCK_SIZE) // Redirect Interrupt routine above first flash block |
#ORG 4,5 |
void JumpToTheInterrupt() // Jump to the Interrupt Handler |
{ #asm GOTO FLASH_BLOCK_SIZE #endasm } |
#ORG 6,FLASH_BLOCK_SIZE-1 {} // First Flash block is reserved |
#ORG LOADER_RESERVED,LOADER_RESERVED+FLASH_BLOCK_SIZE-1 auto=0 |
#SEPARATE |
void dummy_main() // Main on the fix position. It will be overwriten by downloaded program reset vector. |
{ |
real_main(); |
} |
#ORG LOADER_RESERVED+FLASH_BLOCK_SIZE,getenv("PROGRAM_MEMORY")-1 auto=0 default //Start of BootLoader |
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,ERRORS) //RS232 control routine for BootLoader |
#SEPARATE |
unsigned int8 atoi_b16(char *s) // Convert two hex characters to an int8 |
{ |
unsigned int8 result = 0; |
int i; |
for (i=0; i<2; i++,s++) { |
if (*s >= 'A') |
result = 16*result + (*s) - 'A' + 10; |
else |
result = 16*result + (*s) - '0'; |
} |
return(result); |
} |
void assert(int1 Condition, int8 ErrorCode) // Send error number to the serial line |
{ |
if(Condition) |
{ |
putchar('E'); |
putchar(ErrorCode+'0'); |
reset_cpu(); |
} |
} |
void pause() |
{ |
int16 timeout; |
for(timeout=0; timeout<65535; timeout++); // Delay cca 300ms |
} |
#SEPARATE |
void boot_loader() // Loads a new program |
{ |
/* |
:100240001F2999000A300C1E232999006430A4004C |
10 = 16 bytes |
0249 = address 0x0120 (0x240/2 because of words) |
00 = data |
...data... |
4C = checksum |
:00000001FF |
00 = 0 bytes |
0000 = address 0 |
01 = END |
FF = checksum |
http://cs.wikipedia.org/wiki/Intel_HEX |
*/ |
int buffidx; |
char buffer[BUFFER_LEN_LOD]; // Buffer for HEX line |
int8 checksum, num_of_bytes, line_type; // Extracted values from HEX line |
int16 l_addr,h_addr=0; |
int16 addr; // Address of word in PIC |
int32 next_addr; // Helper variable for for |
int8 dataidx, i; // Buffer for program bytes and pointers |
union program_data { |
int8 i8[16]; |
int16 i16[8]; |
} data; |
disable_interrupts(GLOBAL); |
putchar('@'); //Start Erase |
//Erase program. Do not erase "jump to main" and BootLoader. |
{ |
int8 i; |
for(i=0;i<32;i++)buffer[i]=0xFF; |
} |
for(addr=FLASH_BLOCK_SIZE;addr<LOADER_RESERVED+FLASH_BLOCK_SIZE;addr+=FLASH_BLOCK_SIZE) |
{ |
write_program_memory(addr, &buffer[0], 32); |
putchar('.'); |
restart_wdt(); |
} |
putchar('!'); //Erase completed |
//---WDT |
while(!kbhit()) restart_wdt(); //Wait for HEX |
putc('\r'); putc('\n'); |
while(TRUE) |
{ |
//---WDT |
while (getc()!=':') restart_wdt(); // Only process data blocks that starts with ':' |
putchar(':'); |
buffidx = 0; // Read into the buffer until CR is received or buffer is full |
do |
{ |
buffer[buffidx] = getc(); |
putc(buffer[buffidx]); |
} while ( (buffer[buffidx++] != '\r') && (buffidx < BUFFER_LEN_LOD) ); |
assert(buffidx == BUFFER_LEN_LOD, ERR_BUFFER_OVERRUN); // Error 1 - Buffer Overrun |
buffidx--; |
//---WDT |
restart_wdt(); |
checksum = 0; // Sum the bytes to find the check sum value |
for (i=0; i<(buffidx); i+=2) |
{ |
checksum += atoi_b16 (&buffer[i]); |
} |
assert(checksum != 0, ERR_CHECKSUM); // Error 2 - Bad CheckSum |
// Get the lower 16 bits of address |
l_addr = make16(atoi_b16(&buffer[2]),atoi_b16(&buffer[4])); |
line_type = atoi_b16 (&buffer[6]); |
num_of_bytes = atoi_b16 (&buffer[0]); |
assert (num_of_bytes > 16, ERR_TOO_MANY_BYTES); // Error 3 - Too many bytes in one line |
addr = make32(h_addr,l_addr); |
addr /= 2; // PIC16 uses word addresses |
// If the line type is 1 then END |
if (line_type == 1) |
{ |
putchar('#'); |
reset_cpu(); |
} |
assert (line_type != 0, ERR_UNSUPORTED_LINETYPE); // Error 4 - Unsuported Line type |
{ |
// Read old program memory content |
for (i=0,next_addr=addr;i<8;i++) |
data.i16[i]=read_program_eeprom(next_addr++); |
// Loops through all of the data and stores it in data |
// The last 2 bytes are the check sum, hence buffidx-2 |
for (i=8,dataidx=0; i < (buffidx-2); i += 2) |
data.i8[dataidx++]=atoi_b16(&buffer[i]); |
if (addr == 0) |
{ |
// Write 8 words to the Loader location (jump to the main()) |
addr=LOADER_RESERVED; |
write_program_memory(addr, &data.i8[0], 16); |
putchar('%'); |
} |
else |
if ( (addr > 7) && (addr <= (LOADER_RESERVED-16)) ) // Do not overwrite BootLoader |
{ |
// Write program |
write_program_memory(addr, &data.i8[0], 16); |
putchar('$'); |
} |
else putchar('.'); // Possibly there was prevented write to the location of BootLoader |
putc('\r'); putc('\n'); |
//---WDT |
restart_wdt(); |
} |
} |
} |
void main() |
{ |
int8 timeout; |
disable_interrupts(GLOBAL); |
setup_wdt(WDT_2304MS); // Setup Watch Dog |
setup_adc_ports(NO_ANALOGS); |
setup_adc(ADC_OFF); |
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1); |
setup_timer_1(T1_DISABLED); |
setup_timer_2(T2_DISABLED,0,1); |
setup_comparator(NC_NC_NC_NC); |
setup_vref(FALSE); |
setup_oscillator(OSC_8MHZ|OSC_INTRC); |
for(timeout=0; timeout<255; timeout++) //cca 50s |
{ |
if (kbhit()) |
if (getc()=='u') // Send "uf" for Update Firmware |
{ |
putchar('*'); |
if (getc()=='f') |
{ |
restart_wdt(); |
boot_loader(); // Update Firmware starter |
} |
} |
else break; |
putchar('u'); putchar('f'); putchar('?'); |
pause(); |
restart_wdt(); |
}; |
restart_wdt(); |
goto_address(LOADER_RESERVED); // Jump to the location where is the jump to the main |
} |
#ORG default // End of BootLoader |
Property changes: |
Added: svn:keywords |
+Id |
\ No newline at end of property |