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20230823 - Edusat - Subsystem Prototype - Getting started

Relevant links for this note:

Material required

Getting started - Blink LED

The first example is to blink a led, that way we are going to verify that we are able to upload the code. The steps are:

  1. Connect the ESP-Prog to the prototype subsystem board. In this picture is also connected the uCAN that is not required for this example:

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  1. Connect the ESP-Prog to the computer with a microUSB cable. You should be able to see the prototype system Power led high.
  2. Go to arduino IDE, and upload the next code to the board. It is the ESP32-DevKit. The builtin led is connected to the GPIO36 of the ESP32S3.
// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(36, OUTPUT);
  Serial.begin(9600);
}

// the loop function runs over and over again forever
void loop() {
  Serial.println("asdf");
  digitalWrite(36, HIGH);  // turn the LED on (HIGH is the voltage level)
  delay(1000);                      // wait for a second
  digitalWrite(36, LOW);   // turn the LED off by making the voltage LOW
  delay(1000);                      // wait for a second
}

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  1. You should be able to see the led blinking

Send messages over CAN network using the CFP library

The wiring is the next one:

6cb9ff87a082f4f93e1a3f3873b5de7b.png

Connect the uCAN to the computer and configure it as 20230629 - UCAN on EDUSAT.

The code of this example is the next one:

/*
 This example show how to send more than 8 bytes with can usign CFP (CAN Fragmentation Protocol)
*/

#include <Arduino.h>

#include <CFP.h>

#define TX_PIN   14  // Connects to CTX
#define RX_PIN   15  // Connects to CRX

#define CAN_EN_PIN 16

#define SAMPLE_CFP_SOURCE 0
#define SAMPLE_CFP_DESTINATION 1
#define SAMPLE_CFP_ID 404

// Intervall:
#define POLLING_RATE_MS 1000


uint8_t sample_data[] = {0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 16, 17};

CAN_CFP_DATA s_packet = {sample_data, sizeof(sample_data)};


static bool driver_installed = false;

//==================================================================================//
void setup() {
  Serial.begin (115200);
  while (!Serial);
  delay (1000);
  Serial.println ("CAN Receiver/Receiver");

  // Enable CAN transceiver
  pinMode(CAN_EN_PIN, OUTPUT);
  digitalWrite(CAN_EN_PIN, HIGH);

  // Initialize configuration structures using macro initializers
  twai_general_config_t g_config = TWAI_GENERAL_CONFIG_DEFAULT((gpio_num_t)TX_PIN, (gpio_num_t)RX_PIN, TWAI_MODE_NORMAL);
  twai_timing_config_t t_config = TWAI_TIMING_CONFIG_500KBITS();  //Look in the api-reference for other speed sets.
  twai_filter_config_t f_config = TWAI_FILTER_CONFIG_ACCEPT_ALL();

  //Install TWAI driver
  if (twai_driver_install(&g_config, &t_config, &f_config) == ESP_OK) {
      printf("Driver installed\n");
  } else {
      printf("Failed to install driver\n");
      return;
  }

  //Start TWAI driver
  if (twai_start() == ESP_OK) {
      printf("Driver started\n");
  } else {
      printf("Failed to start driver\n");
      return;
  }

  // TWAI driver is now successfully installed and started
  driver_installed = true;
}

void loop() {

  sendCFP(s_packet, SAMPLE_CFP_SOURCE, SAMPLE_CFP_DESTINATION, SAMPLE_CFP_ID);

  delay(10000);
}

With this example you are sending CAN messages. In order to see this messages you can connect a uCAN to your computer, and configure it like 20230629 - UCAN on EDUSAT. The output should be like next one:

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