Embedded WROOM02 - Never Jumps to User code

[jhinkle]

I've embedded a WROOM2 on to another cpu board.

The second cpu does the programming. I have implemented the protocol used by most of the stand-alone flashers (esptool.py) - I do not think I have an issue there.

I am using the latest RTOS SDK with a simple program that acquires AP's as a test.

Reset is clean - no glitches - and has an RC circuit to the pin.

The following is a snippet of the output acquired from UART1.

ets Jan 8 2013,rst cause:1, boot mode:(3,6)

load 0x3ffe8000, len 928, room 16
tail 0
chksum 0x94
load 0x3ffe83a0, len 872, room 8
tail 0
chksum 0xb8
load 0x40100000, len 29340, room 8
tail 4
chksum 0xb1
csum 0xb1
OS SDK ver: 1.5.0-dev(950076a) compiled @ Nov 4 2016 19:29:32'254'


ets Jan 8 2013,rst cause:1, boot mode:(3,6)

load 0x3ffe8000, len 928, room 16
tail 0
chksum 0x94
load 0x3ffe83a0, len 872, room 8
tail 0
chksum 0xb8
load 0x40100000, len 29340, room 8
tail 4
chksum 0xb1
csum 0xb1
OS SDK ver: 1.5.0-dev(950076a) compiled @ Nov 4 2016 19:29:32'254'

This continues forever..... as if a continuous loop.

Question 1 -- Can someone explain this behavior?

Question 2 -- How do I interpret the "tail" and "chksum" values to see if they are telling me an error exists?

Question 3 -- How do I interpret the "load" and "length" and "room" values to see if they are telling me an error exists?

Question 4 -- what should be the proper SPI memory size used in the flasher tool? -- I currently using 2M


I experienced similar resetting issues when working with other ESP platforms (ESP-12, ESP-07, ESP12E NodeMcu) and resolved it by changing the flash size parameter of the flashing tool.

The WROOM02 documentation states that the SPI flash memory is a 2M device -- I'm using that as the flash tool parameter.

The same program runs on a ESP12-E NodeMcu that I use for testing with standard flash tools to program it - making me believe there is no code related issue.

Any thoughts or comments on what's happening and how to resolve it - please.

I have taken another board where I have not yet programmed the ESP. I wanted to make sure I did not have a hardware circuit design issue -- I don't think I do as the following is the debug text from a virgin WROOM02 booting in my embedded board

Decoded Protocol Result
ets Jan 8 2013,rst cause:1, boot mode:(3,6)

load 0x40100000, len 2408, room 16
tail 8
chksum 0xe5
load 0x3ffe8000, len 776, room 0
tail 8
chksum 0x84
load 0x3ffe8310, len 632, room 0
tail 8
chksum 0xd8
csum 0xd8

2nd boot version : 1.6
SPI Speed : 40MHz
SPI Mode : QIO
SPI Flash Size & Map: 16Mbit(512KB+512KB)
jump to run user1 @ 1000


Thanks.

[jhinkle]

Issue resolved