Programming STM32C011J6M6 with Arduino IDE

[GabrielGranzotto]

Hello,

I'm using an STM32C011J6M6 with the Arduino IDE to register with theST25DV64KC-IE6S3 's EEPROM.

I previously used the ATTiny85 and would like to replace it with the STM32C0 to maintain the entire solution with ST components.

I made some changes to the code but I can't register with the SDA/SCL of the STM32C0.

According to the datasheet, I should use pin 8 as SCL and pin 1 as SDA, but the registration with the EEPROM isn't working, I tested the eeprom address with ATTiny85 and it is 0x53

In the project with the ATTiny85, I didn't need to declare the terminal to perform this registration. Does anyone have a programming example that communicates via I2C?

#include <Wire.h>
#include <EEPROM.h>

#define EEPROM_ADDRESS 0x53
#define START_ADDRESS 0 

int currentAddress = START_ADDRESS;

int counter = 0;

void setup() {
  Wire.begin();
}

void loop() {
  writeToEEPROM(currentAddress, currentAddress);

  currentAddress++;

  counter = (counter > 499) ? 0 : counter + 1;

  currentAddress = (currentAddress >= 999) ? START_ADDRESS : currentAddress;

...

void writeToEEPROM(int address, uint8_t value) {
  Wire.beginTransmission(EEPROM_ADDRESS);
  Wire.write((address >> ‌‌8) & 0xFF); // High address byte
  Wire.write(address & 0xFF); // Low address byte
  Wire.write(value);
  Wire.endTransmission();
}

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[Tesla DeLorean]

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[GabrielGranzotto · Accepted solution]

I found the problem, the Wire.h library does not work on the STM32C011J6M6 in the SO8N footprint for some reason that I could not identify.

I changed it to an I²C communication code without the library and reading the datasheet I got to the terminals that are specified as SDA and SCL in the code 

#define LED PA8
#define SCL_PIN 7
#define SDA_PIN PB7
#define ST25DV64K_ADDR 0x53

void i2c_init();
void i2c_start();
void i2c_stop();
void i2c_write_byte(uint8_t data);
void writeEEPROM(uint16_t memAddr, uint8_t data);

int memAddr = 0;
int counter = 0;

void setup() {
    pinMode(LED, OUTPUT);
    i2c_init();
}

void loop() {
    digitalWrite(LED, HIGH);
    delay(500);

    writeEEPROM(memAddr, counter & 0xFF);
    memAddr++;

    counter++;
    if (counter > 255) {
        counter = 0;
    }
    if (memAddr >= 1000) {
        memAddr = 0;
    }
    digitalWrite(LED, LOW);
}

void i2c_init() {
    pinMode(SCL_PIN, OUTPUT_OPEN_DRAIN);
    pinMode(SDA_PIN, OUTPUT_OPEN_DRAIN);
    digitalWrite(SCL_PIN, HIGH);
    digitalWrite(SDA_PIN, HIGH);
}

void i2c_start() {
    digitalWrite(SDA_PIN, HIGH);
    digitalWrite(SCL_PIN, HIGH);
    delayMicroseconds(5);
    digitalWrite(SDA_PIN, LOW);
    delayMicroseconds(5);
    digitalWrite(SCL_PIN, LOW);
    delayMicroseconds(5);
}

void i2c_stop() {
    digitalWrite(SCL_PIN, LOW);
    digitalWrite(SDA_PIN, LOW);
    delayMicroseconds(5);
    digitalWrite(SCL_PIN, HIGH);
    delayMicroseconds(5);
    digitalWrite(SDA_PIN, HIGH);
    delayMicroseconds(5);
}

void i2c_write_byte(uint8_t data) {
    for (int8_t i = 7; i >= 0; i--) {
        digitalWrite(SDA_PIN, (data & (1 << i)) ? HIGH : LOW);
        delayMicroseconds(2);
        digitalWrite(SCL_PIN, HIGH);
        delayMicroseconds(5);
        digitalWrite(SCL_PIN, LOW);
        delayMicroseconds(3);
    }
    
    digitalWrite(SDA_PIN, HIGH);
    digitalWrite(SCL_PIN, HIGH);
    delayMicroseconds(5);
    digitalWrite(SCL_PIN, LOW);
    delayMicroseconds(2);
}

void writeEEPROM(int memAddr, int data) {
    i2c_start();
    i2c_write_byte(ST25DV64K_ADDR << 1);
    i2c_write_byte(memAddr >> 8);
    i2c_write_byte(memAddr & 0xFF);
    i2c_write_byte(data & 0xFF);
    i2c_stop();
    delay(50);
}

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