search

raspberrypi / pico-sdk

BSD 3-Clause "New" or "Revised" License
3.71k stars 919 forks source link

The program gets stuck during I2C communication #1997

Closed Octopus1633 closed 2 days ago

Octopus1633 commented 3 days ago

Hello,

I encountered a strange problem. When using RP2350 with 2MB or 4MB FLASH, everything worked fine. When I changed to 8MB or 16MB, I needed to adjust PICO_FLASH_SPI_CLKDIV or PICO_XOSC_STARTUP_DELAY_MULTIPLIER. After adjustment, 8MB can run normally, but 16MB occasionally fails.

I debugged the program and found that when it failed to run, the program was stuck in a loop, which was called by the program in the i2c_write_blocking_internal function:

do {
    if (timeout_check) {
        timeout = timeout_check(ts, false);
        abort |= timeout;
    }
    tight_loop_contents();
} while (!timeout && !(i2c->hw->raw_intr_stat & I2C_IC_RAW_INTR_STAT_TX_EMPTY_BITS));

I tried to print out I2C_IC_RAW_INTR_STAT_TX_EMPTY_BITS and found that the bit was always 0 and did not change. What could be the reason for this?

lurch commented 3 days ago

Could you provide more details about which exact Flash chips you're using, and which RP2350 board you're using?

Also, if you're able to provide a more complete code-example, that might be useful.

Octopus1633 commented 2 days ago

Thanks for your reply, I have solved it. It seems that PICO_FLASH_SPI_CLKDIV and PICO_XOSC_STARTUP_DELAY_MULTIPLIER are set too large, which may cause I2C to fail to communicate after startup.