Hi Raman, On 11/20/23, Raman Gopalan <ramangopa...@gmail.com> wrote: > Dear Alan, > > I confirm the following settings from the NuttX make menuconfig. RX: PA24, > alternate function 0. TX: PA23, alternate function 0. So, this is correct. > Greg's user manual helped. I just grepped for the definitions. > > I see that the MCUZone's AT32UC3B isn't very different from the AVR32DEV1. > Also, > Alan's link helped. Thank you Alan. I didn't know the document existed > online. > > I just made the jumper connections: > > 1) FTDI's ground -> Board's ground (J2, pin 32 - from the schematic). > 2) FTDI's RX -> Board's TX (J1, pin 15: CPU pin 47, PA_23) > 3) FTDI's TX -> Board's RX (J1, pin 28: CPU pin 59, PA_24) >
Yes, it is seems fine! > I configured `minicom' with 57600, 8, 0, 1. I see both user LEDs on. Yet, > nothing on the minicom except for one strange character. I did > notice/thought of > two things/possibilities: > Do you have a logic analyzer? That strange character could be something, case the clock is incorrect. > a) menuconfig -> Device Driver -> Serial Driver Support -> USART1 > Configuration -> Uses 2 stop bits. The default numeric value assigned for > this > is 0. Is that right? Does 0 indicate "no stop bits"? > That is correct. > b) And I quote from Alan's observation: > >> AVR32DEV1, but it has the 32KHz crystal soldered in the board: > > Alan, I see two crystal oscillators on the board. They have called > (reference > designators) them Y1 and Y3. They are 12 MHz and 32.768 KHz respectively. I > would assume that the latter has something to do with the CPU's RTC. By any > chance, is our external crystal on our dev kit different from the value on > Greg's dev kit? Perhaps the clock configuration is incorrect? > The board is configured to use a 12MHz crystal, so the value is correct. > Alan and Greg: thank you so much for the links to the dev kit reference > manual. > They are very helpful. Finally, I just wanted to see how the clocks are > configured with RT-Thread to compare. I now remember that I used the > Microchip's > ASF (at32uc3b0256) device abstractions for it. It wasn't very > straightforward > for me to compare the settings with arch/avr32/at32uc3_clkinit.c. > You are welcome, thank you for this great investigation about this issue! Best Regards, Alan
