STM32F413CGU6: Reset after Erase Memory command via I2C

[Eric_Z]

Hello,

with an ESP8266 I execute an erase memory command for the STM32F413CGU6 and when the sector is erased, the STM32 always performs a reset. The sector is erased afterwards, but the ESP doesn't have acces to the Boot0 pin and afterwards the STM32 isn't anymore in the boot mode.

This is the function for erasing the memory:

#define I2C_ADDRESS              0x4B // 7-bit I2C address of the STM32 device
bool eraseSectors(HardwareSerial &serial, TwoWire Wire, uint8_t numSectors, uint8_t sector) {
    Wire.beginTransmission(I2C_ADDRESS);
    Wire.write(0x00);      // Send MSB of sector count
    Wire.write(0x00);    // Send LSB of sector count
    Wire.write(0x00);                  // Send checksum
    Wire.endTransmission();

    uint8_t count = 0;
    while ((!receiveAck(Wire)) && count < 10) {
        Serial.println(count);
        delay(1000);
        count++;
    }
    count = 0;
    // Step 3: Send the actual sector numbers
    Serial.println("erase pages");
    Wire.beginTransmission(I2C_ADDRESS);
    
    Wire.write(0x00);      // Send MSB of sector number
    Wire.write(sector);    // Send LSB of sector number
    Wire.write(sector);           // Send checksum for sector numbers
    Wire.endTransmission();

    // Step 4: Wait for ACK after sending sector numbers and checksum
    while ((!receiveAck(Wire)) && count < 10) {
        Serial.println(count);
        delay(1000);
        count++;
    }
    count = 0;

    Serial.println("Sector erased successfully");
    return true;
}

Can someone please tell me where the error is?

Thanks in advance

Eric

[TDK]

> when the sector is erased, the STM32 always performs a reset

What makes you think this? Do you receive an ACK? Code just silently falls through if one is not received.

[Eric_Z]

The reset pin of the STM and the ESP are connected together. Also the ESP resets.

The ACK from the STM for the number of pages is 79 and for the selected sector is DE (it should be 79 aswell).

[Eric_Z]

This is the function for receiving the ACKs:

bool receiveAck(TwoWire Wire) {
    uint8_t response = 0;
    Wire.requestFrom(I2C_ADDRESS_R, 1); // Request 1 byte from STM32
    while (Wire.available()) {
        response = Wire.read();
        if (response == STM32_ACK) {
            Serial.printf("%02X\n", response);
            return true;
        }
    }
    Serial.printf("%02X\n", response);
    return false;
}