MCP2515 and TFT ILI9341 on the same SPI on ESP8266 using Arduino

Projects Programming
1

Hello,
i read from CAN BUS through MCP2515 and i want to write the result on a LCD ILI9341 using SPI.
I am using the library MCP_CAN and ADAFRUIT

#include <Arduino.h>
#include <mcp_can.h>
#include <SPI.h>
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include <Fonts/DS_DIGIT_1_48pt7b.h>

the TFT use the same HSPI of the CAN

// LCD definition
#define TFT_CS 4     //D2  IO4
#define TFT_RST 16   //D0  IO16
#define TFT_DC 5     //D1  IO5
#define TFT_MOSI 13  //D7  IO13
#define TFT_CLK 14   //D5  IO14
#define TFT_MISO 12  //D6  IO12
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_CLK, TFT_RST, TFT_MISO);
// CAN definition
MCP_CAN CAN0(2);    // Set CS to pin GPIO2   D2
#define CAN_INT 15 //D8  //2  // Interrupt CAN  GPIO2  D4

the single elements are working good, LCD works and CAN works, the problem is that at the start i initialize the LCD and it works, then after the CAN begin, LCD stop to work.

void setup() {  // --------------setup
  Serial.begin(115200);
  // ------------------- Init CAN BUS
   pinMode(CAN_INT, INPUT);  // Setting pin INT input
  delay(500);
  // --------------------------- Init LCD
  tft.begin(10000000);```
 tft.fillScreen(BLACK);

 freccia(salita);         //  <---------- draw an arrow on LCD
  // ---------------------

  if (CAN0.begin(MCP_STDEXT, CAN_125KBPS, MCP_8MHZ) == CAN_OK) 
          Serial.print("MCP2515 Init Okay!!\r\n");
  else 
         Serial.print("MCP2515 Init Failed!!\r\n");

  CAN0.init_Mask(0, 1, 0xFFFFF000);  // Init first mask...
  CAN0.init_Filt(0, 1, 0x1FDFC000);  // Init first filter...
  CAN0.init_Mask(1, 1, 0xFFFFF000);
  CAN0.setMode(MCP_NORMAL);             // Change to normal mode
}  // -- fine SETUP

void loop() {  // ------------------------LOOP
 if (!digitalRead(CAN_INT))  // If pin 2 is low, read receive buffer
  {
    CAN0.readMsgBuf(&rxId, &len, rxBuf);  // Read data: len = data length, buf = data byte(s)
    Serial.print("ID: ");
    Serial.print(rxId, HEX);
    Serial.print(" Data: ");
    for (int i = 0; i < len; i++)  // Print each byte of the data
    {
      if (rxBuf[i] < 0x10)  // If data byte is less than 0x10, add a leading zero
      {
        Serial.print("0");
      }
      Serial.print(rxBuf[i], HEX);
      Serial.print(" ");
    }
    Serial.println();
  }
// ..... elaborate message and print something on LCD
}

The result is that at start, LCD draw the arrow in Setup() but after CAN.begin() LCD remain freezed, and CAN continue to work.

I am sure that the problem is in switching module in same SPI, but i think to have the same frequency (mcp_can inizialize SPI with 10000000 and i started TFT.begin(10000000) ).

I tried everything but i got stuck.
I don't want to use another micro just to drive the display, any ideas?

Thanks.
Paolo

2

Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);

// Init TFT SPI
//Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST,TFT_MISO);  // Soft SPI
//Adafruit_ILI9341 tft = Adafruit_ILI9341(&SPI1,  TFT_DC,TFT_CS, TFT_RST); // HARD SPI1
//Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST); // HARD SPI
3

Thanks, that was the solution!

4

GL! TU & you FAM