Greg, Ok, I wired up an FTDI USB converter to UART0... PB27 (UTXD0) and PB26 (UTXR0). That also didn't work. Hmmmm.
I'll think about it some more. Thanks again for the help. cheers adam On Thu, Dec 26, 2019 at 6:30 PM Gregory Nutt <spudan...@gmail.com> wrote: > > > Ok, I used the menuconfig system to set the serial console to UART1, > 57600 > > baud rate. > > > > The system boots, hits the nsh_main breakpoint, I can continue to fputs, > > and then if I continue, then break, the system stops in the idle loop. So > > it seems like it's running, but the serial console isn't working, at > least > > on the DEBUG port. If I boot into Linux, I can get a console login on the > > DEBUG port at 115200 baud. > > > > When I boot NuttX, I don't get any response from the serial terminal. I > can > > see I'm transmitting because the lights on my FTDI console blink. > > > > The SAMA5D27 pinout definitely says that UTXD1 is UART1; and that's what > > the embedded debugger is connected to... so I'm confused. > > > > Any more ideas? > > Not really. > > It is in the IDLE loop because there is nothing to do. This is a > symptom of UART1 no working as it is supposed to. There are a few > things to check. Usually the problem is with pin configuration or with > jumper settings > > First, check the jumpers. In 5.4.14 it looks like you would need: > > Pin J9 *NOT* tied to ground > Jumper JP1 *NOT* installed > Jumper JP2 DEBUG_DIS ON > > Then double check the pin configurations. > > In the schematic, I see that the connection to the CDC/ACM VCOM is via > DBGU_UXTD1_PD3 and > DBGU_URXD1_PD2. > > The UART1 pins must defined in the board.h file. I see > > #define PIO_UART1_RXD PIO_UART1_RXD_1 > #define PIO_UART1_TXD PIO_UART1_TXD_1 > > And if I look in arch/arm/src/sama5/hardware/_sama5d2x_pinmap.h, I see > > PIO_UART1_RXD_1 is pin PD2 > PIO_UART1_TXD_1 is pin PD3 > > So that looks okay. > > You can try UART2 if you like. Sometimes EDGB VCOM interfaces are > mysterious. On UART2 you could at least look at what is the TX pin to > see if anything is coming out. Careful with pin configurations! > > Greg > > -- Adam Feuer <a...@starcat.io>
