Category: ESP8266

Accessing ESP8266 Arrays in FLASH

Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, Flash23 Comments on Accessing ESP8266 Arrays in FLASH

A new challenge – the answer to which I will post in here. Accessing an ESP8266 C array in FLASH – i.e. never touching RAM until you actually access something.  One suggestion was to ensure you use 4-byte variables.. so I tried this – it compiled – the array is…

Read More→

Lua Revisited

Peter ScargillEclipse, ESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-13, ESP-201, ESP-210, ESP12, ESP8266, LUA, MQTT12 Comments on Lua Revisited

Back in the dark ages when the ESP8266 was something new, I had a go at the nodeMCU software, essentially implementing the Lua language (or a subset of it) on the ESP8266.  At the time I was not familiar with Lua but thanks to some of the excellent resources out…

Read More→

ESP8266 Debug

Peter ScargillC Programming, ESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP826618 Comments on ESP8266 Debug

So – I’ve learned quiet a lot in the past few days.. Watchdogs on the ESP8266 Since Espressif SDK 1.01 or thereabouts, watchdog timer operation seems to have changed – delays of any length even in init()  are out – or so it would seem? So I got onto Stanza…

Read More→

ESP8266 RESET

Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP826632 Comments on ESP8266 RESET

As often as not, when I reset an ESP8266 by using the system reset call in the SDK, after flashing – for example. if (strcmp(token, “id”) == 0) {                    if (isQuery) RESPONSE(“ID=%s\r\n”, sysCfg.base);                    else if (strlen(strValue)>=2){                        strcpy(sysCfg.base, strValue);                        CFG_Save();                        system_restart();                    } The unit does not come out of reset.. the…

Read More→

ESP8266 Bliss

Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP826621 Comments on ESP8266 Bliss

You may have seen comments in here from Richard Burton about his bootloader. Well, I have to tell you – what a game-changer. If you look at a previous blog where I showed you how we’d moved code from the fairly normal 0x40000 starting point down to 0x20000 – freeing…

Read More→

ESP8266 SDK 1.11

Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-12E, ESP-201, ESP12, ESP8266, Espressif

Just a short one for those of you who’ve not tried the new Espressif SDK update yet (SDK 1.11).  I noted a pair of commands “system_param_load” and “system_param_save_with_protect” which appear to replace the need for the load and save functions that TuanPM uses in his code in /mqtt/config.c  – so…

Read More→

ESP8266 Test Board

Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-201, ESP12, ESP8266, Espressif13 Comments on ESP8266 Test Board

I mentioned that Espressif were kind enough to send me a test board to play with – and very nice too. Not had time yet as I’m struggling with learning how to make an installer for my Node-Red package – with some great help from the guys involved with this….…

Read More→

Presents from Espressif

Peter ScargillESP-01, ESP-02, ESP-03, ESP-04, ESP-05, ESP-06, ESP-07, ESP-08, ESP-09, ESP-10, ESP-11, ESP-12, ESP-201, ESP12, ESP82669 Comments on Presents from Espressif

Let me start by explaining that Espressif are makers of fine WIFI gadgets.. specifically they have spawned a whole new lease of life for IOT… by producing a marvellous little chip that contains a complete processor, memory and WIFI interface needing only a tiny FLASH memory chip and a couple…

Read More→