Hello,
I am trying to modify the bootloader code for PIC128K (from the examples directory for MikroC) and make it suitable for PIC18F97J60, but I have the following problem. It starts to transfer the hex file and it seems it the first 64 bytes are transfered but after that afer several seconds the bootloader software shows "Error: Timeout waiting for MCU. Disconnected.".
I am using 25MHZ clock. Baudrate is 2400.
The bootloader PC software is the embedded one in MikroC (version 6.6.2).
The only modification I have made are that I changed the baudrate value and removed the instructions EECON1.EEPGD = 1; and EECON1.CFGS = 0;
Boot_Loader.c:
Code: Select all
void Susart_Init(char Brg_reg);
void Susart_Write(char data_);
void Start_Bootload();
void Start_Program();
char Susart_Write_Loop(char send, char recieve);
//-------------- Boootloader main for 128K PIC18's
void main() org 130424 {
// 16Mhz --> 103 look for asynchronous high speed table
// 10Mhz --> 64
// 8Mhz --> 51
// 4Mhz --> 25
// |
// |
// |
// \ /
// |
Susart_Init(162); // Init USART1 at 2600
if (Susart_Write_Loop('g','r')) { // Send 'g' for ~5 sec, if 'r'
Start_Bootload(); // received start bootload
}
else {
Start_Program(); // else start program
}
}
boot18_128K_G.c.:
Code: Select all
#include "built_in.h"
/*
* constants :
* _FLASH_WRITE_LATCH - flash write latch size
* _FLASH_ERASE - flash erase block size
* are related to mcu flash memory write and erase block sizes
* and as such are defined in appropriate flash library file.
* Be aware that these constants are MCU dependent.
* Compiler will link them from appropriate flash library,
* so the user does not have to take care of them.
*
*/
static char block[64];
void Susart_Init(unsigned short brg_reg) org 130768 {
unsigned short i;
TXSTA1.TXEN = 1;
RCSTA1 = 0x90;
TXSTA1.TX9D = 0; //8-bit transmission
TXSTA1.BRGH = 0;
SPBRG1 = brg_reg;
TXSTA1.SYNC = 0;
BAUDCON1.BRG16 = 0;
TRISC.B7 = 1;
TRISC.B6 = 0;
while (PIR1.RCIF)
i = RCREG1;
}
void Susart_Write(unsigned short data_) org 130728 {
while (!TXSTA.TRMT)
;
TXREG = data_;
}
unsigned short Susart_Data_Ready() org 130754 {
return (PIR1.RCIF);
}
unsigned short Susart_Read() org 130696 {
unsigned short rslt;
rslt = RCREG1;
if (RCSTA1.OERR) {
RCSTA1.CREN = 0;
RCSTA1.CREN = 1;
}
return rslt;
}
//-------------- Empty function, this is where the start address of 'real'
// program will be placed (by Write_Begin()). That is why
// this function must have at least 4 bytes of ROM available
// after its org address.
void Start_Program() org 0x1FFC0 {
}
void Flash_Write_Sector(long address, char *sdata) org 130518 {
unsigned short saveintcon, i, j;
saveintcon = INTCON;
//--- erase memory
TBLPTRL = Lo(address);
TBLPTRH = Hi(address);
TBLPTRU = Higher(address);
//--- required erase sequence
//EECON1.EEPGD = 1;
//EECON1.CFGS = 0;
EECON1.WREN = 1;
EECON1.FREE = 1;
INTCON.GIE = 0;
EECON2 = 0x55;
EECON2 = 0xAA;
EECON1.WR = 1;
INTCON.GIE = 1;
asm TBLRD*- ;
//--- write memory `
FSR0L = Lo(sdata);
FSR0H = Hi(sdata);
j = 0;
while (j < _FLASH_ERASE/_FLASH_WRITE_LATCH) {
i = 0;
while (i < _FLASH_WRITE_LATCH) {
TABLAT = POSTINC0;
asm {
TBLWT+*
}
i++;
}
//EECON1.EEPGD = 1;
//EECON1.CFGS = 0;
EECON1.WREN = 1;
INTCON.GIE = 0;
EECON2 = 0x55;
EECON2 = 0xAA;
EECON1.WR = 1;
j++;
}
INTCON.GIE = 1;
EECON1.WREN = 0;
//--- restore interrupt
INTCON = saveintcon;
}
unsigned short Susart_Write_Loop(char send, char receive) org 130460 {
unsigned short rslt = 0;
LBL_BOOT18_128_01:
___Boot_Delay128k();
Susart_Write(send);
___Boot_Delay128k();
rslt++;
if (rslt == 255u)
return 0;
if (Susart_Read() == receive)
return 1;
goto LBL_BOOT18_128_01;
}
//-------------- This void will recover the bootlocation 0x0000, 0x0001 and
// 0x0002 to point to the bootloaer's main. It will also move
// the reset vector of the program that is uploaded to a new
// location, in this case 130424
void Write_Begin() org 130642 {
Flash_Write_Sector(0x01FFC0, block);
//--- goto main 130424
block[0] = 0xBC;
block[1] = 0xEF;
block[2] = 0xFE;
block[3] = 0xF0;
}
//-------------- Starts with bootload
void Start_Bootload() org 130804 {
unsigned short i = 0, xx, yy;
long j = 0;
while (1) {
if (i == 64u) {
//--- If 32 words (64 bytes) recieved then write to flash
if (!j)
Write_Begin();
Flash_Write_Sector(j, block);
i = 0;
j += 0x40;
}
//--- Ask for yy
Susart_Write('y');
while (!Susart_Data_Ready()) ;
//--- Read yy
yy = Susart_Read();
//--- Ask for xx
Susart_Write('x');
while (!Susart_Data_Ready()) ;
//--- Read xx
xx = Susart_Read();
//--- Save xxyy in block[i]
block[i++] = yy;
block[i++] = xx;
}
}
Does anybody see where it might be the problem ?
Thank you in advance!
