Tool/software:
I am trying to invoke the BSL from my ESP32 to flash custom image to my MSPM0. Couple Questions and errors I am running into. I have looked at the BSLGuide and BSL Implimentation PDFs. I am currently trying to invoke the BSL but its not working. Here is my code for trying to invoke the BSL.
D12 connects to PA18. Before this the line is driven Low
D11 is connected to NRST. Before this function the line is driven High.
void enterBSL() {
// Step 0: Assert BSL_invoke (PA18) high first
digitalWrite(D12, HIGH); // PA18 = BSL_invoke, active high
delayMicroseconds(500); // hold it for ≥500us per TI guidance
// Step 1: Pulse NRST low to trigger BOOTRST
digitalWrite(D11, LOW); // NRST low (reset)
delay(2); // hold reset low; 100us is more than enough (2ms here is safe)
// Step 2: Release NRST
digitalWrite(D11, HIGH); // NRST high — device boots, sees BSL_invoke high
// Step 3: Keep BSL_invoke high briefly while bootloader starts
delay(500); // give some time for bootcode to sample and enter BSL
// Optional: you can pull PA18 low afterward if your application reuses it
}
From here I am connecting TX to PA11 and RX to PA10. Before I get to the Sending Connection to BSL I read the UART line and it is saying 0xC0. then after nothing else.
after the invoke+ reading UART Line, I am then sending the connection.
// this snippet of my code is where I am writing the packet info over UART.
Serial2.write(0x80); // header
Serial2.write(0x01); // Length
Serial2.write(0x00);
Serial2.write(0x19); // command (all my data)
uint8_t data = 0x19;
uint32_t crc32Code = crc32_iso(&data, 1);
Serial2.write((uint8_t)(crc32Code & 0xFF)); // LSB
Serial2.write((uint8_t)((crc32Code >> 8) & 0xFF));
Serial2.write((uint8_t)((crc32Code >> 16) & 0xFF));
Serial2.write((uint8_t)((crc32Code >> 24) & 0xFF)); // MSB
After this, I am waiting for any response back from the BSL but nothing comes.
Could you help me identify the issue? I have spent multiple hours but couldn't figure out the solution yet.
Also for reference, I have the software invoke flashed onto my MSPM0, but I am still just trying to do the regular MSPM0 hardware invoke such that it works for any image being on the MSPM0.
Thankyou so much,
Best Regards,
Prathik Narsetty
Prathik Narsetty
