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davidnclare
Joined: 08 Sep 2010
Posts: 9
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| Another Bootloader |
 Posted: Wed Nov 16, 2016 5:28 am |
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Hi All,
Well I have not posted on here for a while, to be honest, I usually just search through all the post and find the answer, but I am stumped on the this.
Compiler PCH Version 4.109
PIC 18F4585
Prototype board my own, all pins used are correct and it works without fault.
bootloader code
bootloader.c
| Code: |
#include <18F4585.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=8000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7) // Jumpers: 8 to 11, 7 to 12
//#endif
#define LED PIN_B1
#define _bootloader
#include <bootloader.h>
#include <loader.c>
//#if defined(__PCM__)
// #org LOADER_END+1,LOADER_END+10
//#if defined(__PCH__)
#org LOADER_END+2,LOADER_END+20 //0ld 20
//#endif
#int_global
void isr(void) {
jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));//old jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8))
}
void application(void)
{
while(TRUE);
{
}
}
//#if defined(__PCH__)
#org 0x40,0x7F //old 7F
//#else
//#org 0x20,0x3F
//#endif
void main(void)
{
if(!input(PIN_B5))
{ output_high(LED);
load_program();
}
application();
}
#ORG default
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Bootloader.h code
| Code: |
#if defined(__PCM__)
#define LOADER_END 0x1FF
#define LOADER_SIZE 0x1BF
#elif defined(__PCH__)
#define LOADER_END 0x4FF//old 4FF
#define LOADER_SIZE 0x3FF
#endif
#ifndef _bootloader
#if defined(__PCM__)
#build(reset=LOADER_END+1, interrupt=LOADER_END+5)
#elif defined(__PCH__)
#build(reset=LOADER_END+1, interrupt=LOADER_END+9)
#endif
#org 0, LOADER_END {}
#endif
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Test Program code
LedFlash.c
| Code: |
#include <LedFlash.h>
#include <bootloader.h>
#define LED PIN_B1
void main()
{
setup_adc_ports(NO_ANALOGS|VSS_VDD);
setup_adc(ADC_CLOCK_DIV_2|ADC_TAD_MUL_0);
//setup_pp(PMP_DISABLED);
setup_spi(SPI_SS_DISABLED);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_ccp1(CCP_OFF);
setup_comparator(NC_NC_NC_NC);
//Example blinking LED program
while(true){
output_low(LED);
delay_ms(1000);
output_high(LED);
delay_ms(1000);
}
}
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LedFlash.h
| Code: |
#include <18F4585.h>
#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HS //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES BORV21 //Brownout reset at 2.1V
#FUSES NOPUT //No Power Up Timer
#FUSES NOCPD //No EE protection
#FUSES STVREN //Stack full/underflow will cause reset
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT //Program memory not write protected
#FUSES NOWRTD //Data EEPROM not write protected
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled
#FUSES PBADEN //PORTB pins are configured as analog input channels on RESET
#FUSES BBSIZ4K //4K words Boot Block size
#FUSES NOWRTC //Configuration registers not write protected
#FUSES NOWRTB //Boot block not write protected
#FUSES NOEBTR //Memory not protected from table reads
#FUSES NOEBTRB //Boot block not protected from table reads
#FUSES NOCPB //No Boot Block code protection
#FUSES LPT1OSC //Timer1 configured for low-power operation
#FUSES MCLR //Master Clear pin enabled
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#use delay(clock=8000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PC,ERRORS)
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Bootloader.h and loader.c are unmodified
What it does do,
Both compile without errors and load into the pic using a ICD U64
Both run and work.
What it doesn't do
Bootloader doesn't load the LedFlash program.
On power up with PIN B5 low, the LED comes on, so I know it is in the load condition.
I then send the program via a FDTI USB to serial converter, using CCS SOIW and TERA TERM, both have the same outcome.
I have reduced the serial port buffer to its lowest setting 64, and flow control in on.
If I add a transmit delay between characters and lines I can see the PIC responding as it should, but on completion of the down load (PIN B5) sent high during download, the pic just stays in the Load condition,
What am I missing?
thanks inadvance |
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jeremiah
Joined: 20 Jul 2010
Posts: 1355
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| Posted: Wed Nov 16, 2016 8:06 am |
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I don't think this is your problem, but something to eliminate as a possibility:
Your application fuses and your bootloader fuses are not specified identically. If the defaults differ, then you could have a fuses mismatch, which could lead to interesting behavior.
I would either:
1. Use the same exact fuses in both
OR
2. Specify #fuses NONE in the application side |
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davidnclare
Joined: 08 Sep 2010
Posts: 9
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| Posted: Wed Nov 16, 2016 8:20 am |
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Thanks, just tried that still, the same.
I am going to try and increase the buffer in the loader.c file make it bigger than the buffer on the USB to serial port converter. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Wed Nov 16, 2016 9:05 am |
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Critical thing is that XON/XOFF handshaking must be enabled on the port that you use. There isn't actually a 'buffer' in loader.c (in the sense of a FIFO). There is just a temporary store into which the line is read. When the line is complete, the sender _must_ stop (this is why the code sends XOFF). The reason is the processor has to actually stop code execution, to write it's own flash memory, so any data arriving while this is going on, will cause a disaster.
Generally you need to enable this in both device manager, and in the program (some ports respond to one, and not the other....). |
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davidnclare
Joined: 08 Sep 2010
Posts: 9
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| Posted: Wed Nov 16, 2016 9:12 am |
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| Thanks, I have been doing it in the terminal emulator, but not in device manager, I will try it. |
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davidnclare
Joined: 08 Sep 2010
Posts: 9
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| Posted: Wed Nov 16, 2016 9:49 am |
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XON/XOFF handshaking enable in both location, I have also turned up the delay after each line transmission, and you can definitely see the tx and rx led's cycle on the off as they should.
It is like it is not doing the last lines on the code and reseting the PIC
Thanks, I will keep trying things. |
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davidnclare
Joined: 08 Sep 2010
Posts: 9
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| Posted: Wed Nov 16, 2016 11:56 am |
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I think I have sorted it
| Code: |
void isr(void) {
jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8));//old jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8))
}
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Should be
| Code: |
void isr(void) {
jump_to_isr(LOADER_END+1*(getenv("BITS_PER_INSTRUCTION")/8));//old jump_to_isr(LOADER_END+5*(getenv("BITS_PER_INSTRUCTION")/8))
}
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Ttelmah
Joined: 11 Mar 2010
Posts: 19545
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| Posted: Wed Nov 16, 2016 1:16 pm |
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That is not right.
The ISR entry is at address 4 in the processor. Loader end+5 is correct (loader end is one below where the code should start)..
I'd suggest your real problem is that your code is slightly overrunning the area allocated. You do understand that _you_ have to set loader end to the next page boundary above where your bootloader code ends. I'd suspect your loader, is larger than the CCS supplied one, hence the problems. |
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davidnclare
Joined: 08 Sep 2010
Posts: 9
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| Posted: Thu Nov 17, 2016 4:12 am |
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Hi,
For some reason the Application was not at 0x500 by changing the isr and recompiling, it put the application at 0x500, so now changed the isr code back and it works bazar. |
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