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bschriek
Joined: 18 Dec 2007
Posts: 76
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| Eeprom and Bootloader |
 Posted: Tue Oct 27, 2020 1:52 pm |
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16F18324, PCW, 5.092
When I program the MAIN PROGRAM with use of my ICD-U64 I can read and write to the Eeprom.
| Code: |
#include <16F18324.H> //4096 Words, Last memory at 0FFFh.
#FUSES RSTOSC_HFINTRC,NOWDT,NOPUT,NOMCLR,NOPROTECT,NOCPD,BROWNOUT,BORV27,NOCLKOUT, NOFCMEN,NOSTVREN,NODEBUG,NOLVP
#use delay(clock=8000000)
#include <bootloader.h> // Mag blijven staan, ook in geval van direct programmeren met ICD-U64
#use rs232(ICD, baud=19200, xmit=PIN_A0) //Dit werkt met ICD-U64 en Telnet input 38400
int Temp0=0, Temp1=0, Temp2=0, Temp3=0, Temp4=0;
// This work's fine.
/*
#rom 0xF000 = {1}
#rom 0xF001 = {2}
#rom 0xF002 = {3}
*/
//Or even better
#ROM int8 getenv("EEPROM_ADDRESS") = {1,2,3}
void main()
{
setup_oscillator(OSC_HFINTRC_8MHZ);
set_tris_a(0b00001110); // 0 = output xmit=PIN_A0, rcv=PIN_A1)
set_tris_c(0b00100111); // 0 = output
delay_ms(1000);
///////////////////////////////////////////////////////////////////////////////
while (1)
{
delay_ms(1000);
Temp0 = read_eeprom(0);
printf("%u",Temp0);
Temp1 = read_eeprom(1);
printf(" %u",Temp1);
Temp2 = read_eeprom(2);
printf(" %u",Temp2);
printf("\r\n");
//
delay_ms(1000);
write_eeprom (0,4);
write_eeprom (1,5);
write_eeprom (2,6);
}
}
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RS232 output:
1 2 3
4 5 6
4 5 6
4 5 6
But when I first program the Bootloader by ICD-U64:
| Code: |
#include <16F18324.H>
#FUSES RSTOSC_HFINTRC,NOWDT,NOPUT,NOMCLR,NOPROTECT,NOCPD,BROWNOUT,BORV27,NOCLKOUT,NOFCMEN,NOSTVREN,NODEBUG,NOLVP
#Device ADC=8
#use delay(clock=8000000) //Fuses and delay are set, so int osc is set at 8Mhz.
#use rs232(baud=19200, xmit=PIN_A0, rcv=PIN_A1) //Text through the UART
#define _BOOTLOADER
//#define BOOTLOADER_MODE2X
#include <bootloader.h>
#include <loader.c>
#org LOADER_END+1,LOADER_END+2
void application(void)
{
while(TRUE);
}
void main(void)
{
setup_oscillator(OSC_HFINTRC_8MHZ);
setup_dac(DAC_OFF);
setup_vref(VREF_OFF);
port_a_pullups(0b00001110); // 2,3, Led Pin_A1 Xmit op Pin_A0
port_c_pullups(0b00000111); // 0,
set_tris_a(0b00001110); // 0 = output xmit=PIN_A0, rcv=PIN_A1)
set_tris_c(0b00100111); // 0 = output
delay_ms(10);
printf("\r\nStarted\r\n");
//--------
if (!input(PIN_A3))
{
printf("\r\nBootloader Version 1.0"); // Let the user know it is ready to accept a download
printf("\r\nWaiting for download...");
load_program();
}
application();
}
#int_global
void isr(void)
{
jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));
}
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And then upload the MAIN PROGRAM by RS232 then {1,2,3} is not programmed at the right location. Later on {4,5,6} are saved and can be read without problems.
| Code: |
#include <16F18324.H> //4096 Words, Last memory at 0FFFh.
//#FUSES RSTOSC_HFINTRC,NOWDT,NOPUT,NOMCLR,NOPROTECT,NOCPD,BROWNOUT,BORV27,NOCLKOUT, NOFCMEN,NOSTVREN,NODEBUG,NOLVP
#FUSES NONE
#use delay(clock=8000000)
#include <bootloader.h> // Mag blijven staan, ook in geval van direct programmeren met ICD-U64
#use rs232(ICD, baud=19200, xmit=PIN_A0) //Dit werkt met ICD-U64 en Telnet input 38400
int Temp0=0, Temp1=0, Temp2=0, Temp3=0, Temp4=0;
// This work's fine.
/*
#rom 0xF000 = {1}
#rom 0xF001 = {2}
#rom 0xF002 = {3}
*/
//Or even better
#ROM int8 getenv("EEPROM_ADDRESS") = {1,2,3}
void main()
{
setup_oscillator(OSC_HFINTRC_8MHZ);
set_tris_a(0b00001110); // 0 = output xmit=PIN_A0, rcv=PIN_A1)
set_tris_c(0b00100111); // 0 = output
delay_ms(1000);
///////////////////////////////////////////////////////////////////////////////
while (1)
{
delay_ms(1000);
Temp0 = read_eeprom(0);
printf("%u",Temp0);
Temp1 = read_eeprom(1);
printf(" %u",Temp1);
Temp2 = read_eeprom(2);
printf(" %u",Temp2);
printf("\r\n");
//
delay_ms(1000);
write_eeprom (0,4);
write_eeprom (1,5);
write_eeprom (2,6);
}
}
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RS232 output:
Started
4 5 6
4 5 6
4 5 6
Any idea what's wrong? |
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gaugeguy
Joined: 05 Apr 2011
Posts: 287
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| Posted: Tue Oct 27, 2020 3:42 pm |
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| Nothing is wrong. The bootloader will only load operational code, not EEPROM presets. Normally this is what is wanted so that operational code can be updated by the bootloader without losing calibration values or settings in EEPROM. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19215
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| Posted: Wed Oct 28, 2020 1:49 am |
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Also, the actual code to write to the EEPROM, is different to the code to write
the program memory, so a 'bootloader' which uses program memory write
instructions, can't write to the EEPROM. |
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temtronic
Joined: 01 Jul 2010
Posts: 9093
Location: Greensville,Ontario
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| Posted: Wed Oct 28, 2020 5:04 am |
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It would be disastrous IF the EEPROM could be rewritten by the bootloader !
As gaugeguy say, typically EEPROM holds config data, either 'presets' or '1time calibration data'...
Say limits for garage door openers (THAT I found out the hard way....),
or say User IDs/Passwords/Login Info (BTW never erase 'all cookies' on your PC !).
Perhaps the PIC has config data for a calibrated analog sensor, that would be lost, requiring a new 'sensor calibration' to be done, but 'on the bench' !
Another could be the GPS location data, or well water level data.
Jay |
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bschriek
Joined: 18 Dec 2007
Posts: 76
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| Posted: Wed Oct 28, 2020 5:28 am |
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OK, that makes sense!
So the solution is to remove the line underneath from the MAIN PROGRAM and add the line to the Bootloader and then it will run fine from the begin.
| Code: | | #ROM int8 getenv("EEPROM_ADDRESS") = {1,2,3} |
Thank you for your help. |
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bschriek
Joined: 18 Dec 2007
Posts: 76
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| Posted: Wed Oct 28, 2020 11:52 am |
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Tested and solved!
But another question if you have some time left.
Underneath the first lines of the file BOOTLOADER.H file
//////////////////////////////////////////////////////////////////////////
//// BOOTLOADER.H ////
//// ////
//// This include file must be included by any application loaded ////
//// by the example bootloader (ex_bootloader.c). ////
//// ////
//// The directives in this file relocate the reset and interrupt ////
//// vectors as well as reserving space for the bootloader. ////
//// ////
//// LOADER_END may need to be adjusted for a specific chip and ////
//// bootloader. LOADER_END must be 1 minus a multiple of ////
//// FLASH_ERASE_SIZE. ////
///////////////////////////////////////////////////////////////////////////
But in my case I had to add #include <bootloader.h>
To the Bootloader and MAIN PROGRAM file. Is this right?
And 2nd question, what value must be used for LOADER_END in my case?
I didn't changed this value and still everything works fine.
Thank you again and I hope this clarifies the bootloader for others too. |
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