Hi,
I'm trying to access the data flash memory of the BQ40Z80 via SMBus. In order to do so I'm referring to the Technical Reference Manual (rev.C) page 146-147. This is what I've found for the data flash access memory:
I'd want to get information from the register 0x4CE9 (Temperature Threshold), thus I wrote the following code:
#include <Wire.h>
const uint8_t deviceAddress = 0x0B;
const uint16_t startingAddress = 0x4CE9; // Replace with the desired starting address
const uint8_t manufacturerBlockAccess = 0x44; // Manufacturer Block Access command
void setup() {
Wire.begin(); // Initialize SMBus communication
Serial.begin(9600); // Initialize serial communication
}
void loop() {
// Send SMBus block write with ManufacturerBlockAccess() and the starting address
// Format: ManufacturerBlockAccess() + Starting Address (little endian)
uint8_t writeData[3];
writeData[0] = manufacturerBlockAccess;
writeData[1] = startingAddress & 0xFF; // Low byte of starting address
writeData[2] = (startingAddress >> 8) & 0xFF; // High byte of starting address
// Start the transmission
Wire.beginTransmission(deviceAddress);
// Send the write data
Wire.write(writeData, 3);
// End the transmission
Wire.endTransmission();
// Delay to allow time for the device to process the write operation
delay(10);
// Send SMBus block read with ManufacturerBlockAccess()
// Format: ManufacturerBlockAccess()
Wire.beginTransmission(deviceAddress);
// Send the read command
Wire.write(manufacturerBlockAccess);
// End the transmission
Wire.endTransmission();
// Request data block from the SMBus device (32 bytes)
Wire.requestFrom(deviceAddress, 34); // Include two extra bytes for the starting address
// Check if data is available to read
if (Wire.available() >= 34) {
// Read and process the received data
uint8_t receivedData[34];
for (int i = 0; i < 34; i++) {
receivedData[i] = Wire.read();
}
// Combine the low and high bytes for the starting address (little endian)
uint16_t receivedStartingAddress = (uint16_t(receivedData[2]) << 8) | receivedData[1];
Serial.println("Received Data:");
Serial.print("Starting Address: 0x");
Serial.println(receivedStartingAddress, HEX);
// Print the 32 bytes of DF data
for (int i = 3; i < 33; i++) {
Serial.print("Data");
Serial.print(i - 2);
Serial.print(": 0x");
Serial.println(receivedData[i], HEX);
}
}
delay(1000); // Wait for a moment before performing the next operation
}
During the writing, the device doesn't acknowledges maybe because I misinterpreted the procedure. Can you please examine the code and tell me if anything is wrong on how I'm asking informations to the BQ40Z80?
