![]() Is activated, and MISO becomes an output if configured so by the user. When the SPI is configured as a Slave, the Slave Select (SS) pin is always input. But there is no code in that link that you sent. SPDR = myData //places 0x12, then 0x34īut I want to achieve something more basic, something he already did, to be able to send and receive info from the Slave, but I only want him to do that when SS enables it (how SPI generally works). SPI.attachInterrupt() //interrupt logic is enabled PinMode(SS, INPUT_PULLUP) // ensure SS stays high for now SPI.setClockDivider(SPI_CLOCK_DIV16) // SPI.setClockDivider(SPI_CLOCK_DIV16) //1 MBits/sĭigitalWrite(SS, LOW) //Slave is selected This is the screen shot (Fig-2) of the Serial Monitor of ESP8266-SPIMaster. Seriously, I would really appreciate it if you could help me, thanks!Ģ. Serial.println("Successful initialization") Īt no time is it seen that the code sets the SS pin high or something (I think that is done in the SD library), nor in the Esp8266 code, and I would need that to control two Slaves. It works well and there are no problems with it, but my problem comes when I want the Arduino (Slave) to send info to Esp8266, I DON'T KNOW HOW TO DO IT, I don't know why I can't find example codes about this (sorry if there are any, but I CAN'T FIND THEM), I tried to do it by myself with what little I knew, but it didn't work. There is almost no information about SPI on the internet, much less related to Esp8266, but I found these two codes that allow me to send info from Esp8266 (Master) to Arduino (Slave). I have an Arduino Uno and an Esp8266, both are connected via SPI, Esp8266 is the Master and the Arduino is the Slave. The SPI master code was inspired and parts were taken from the ESPSlave example of the ESP8266 Arduino project.Hello again, I have a question, or maybe 2 questions, but first I will tell you what I have. The code structure and some code is taken from this library, too. The protocol running on SPI interface was inspired by protocol used in Arduino WiFi library. If you are using modules with USB connection (NodeMCU, e.g.), all you have to do is to connect the module to your USB port. This is a standard procedure and you can find details anywhere on the Internet. Put GPIO0 low (GND) and reset the chip just before flashing begins. The application runs fine on minimum setup (512K, no SPIFFS).įor flashing you will need to connect the USB to Serial converter to Rx and Tx pins and put CH_PD high (3.3V) and GPIO15 low (GND). Compiling and flashingĭon't forget to change the board values in the Arduino environment (menu Tools - Board and next). The installation process is described on esp8266/arduino github pages. ![]() The Arduino IDE environment is capable to compile and flash programs for ESP8266 modules. The simplest way to do it is to use the Arduino IDE with support for ESP8266. ![]() Please be careful, the ESP8266 chip ports are NOT 5V tolerant, if you're connecting to a 5V device you have to use a level converter. If you are using a reset circuit for proper signals on reset, use GPIO5 as SS_EN output. The library uses hardware SPI on Arduino so most of the signals are fixed to certain pins. While this project enables the SPI communication as a slave device, on master devices the corresponding library must be loaded.įor Arduino AVR devices the library is WiFiSpi. ![]() The HSPI signals are multiplexed with GPIO12-15. The first is connected to the flash memory, the second (named HSPI) can be used by user. Verified and supported the reset circuit ensuring proper reset of ESP8266 (more here). The protocol version is now 0.2.0 and is incompatible with the former one. Shortened the status message from 4 bytes to 2 bytes and added XOR check. Įnhanced communications protocol (added CRC-8 and confirmation of message reception). Added verifySSL function that verifies server certificate (SHA1 fingerprint and domain name). Īdded SSL Client connection using the AxTLS library. If you are really into using the bleeding edge esp8266/Arduino repo, go to WiFiSpi library and change the wl_status_t in wl_definitons.h file according to the esp8266 repo. Until a new esp8266/Arduino release comes, you have to use release 2.7.4 Unfortunately, this enum changed in time in esp8266/Arduino repository. The enum has to be the same both in master and slave code. The problem is in the enum wl_status_t in wl_definitons.h file. The newest esp8266/Arduino repository code breaks the app. The SPI interface is used because of its strictly master/slave nature. The application implements custom SPI protocol on HSPI interface of ESP8266 module and enables to use it as a dedicated WiFi slave device - see below. This application is intended to run on ESP8266 module with accessible HSPI interface (e.g.
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