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Posted to dev@nuttx.apache.org by Ludovic Vanasse <lv...@luxaerobot.com> on 2025/08/12 18:33:28 UTC
Port of Nucleo-H7543ZI - Issue with UART6
Hi everybody,
I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
Nucelo-H743ZI. It's going pretty well.
But now I feel like I've hit a wall, and I am coming here to see if anybody
has an idea as to what might be the issue.
I'm planning to use NuttX for High Altitude balloons, and I'm preparing the
groundwork for the rest of my team to then split the work between us. Which
involve interacting with SATCOM modules, GPS, radios, etc.
And I'm trying to do something very basic, but I'm having issues. I want to
be able to validate that the UART6 is working well, so I can validate that
the porting is working for this peripheral. And I'm trying to simply send
some data down the line with nsh. With this command:
```
nsh> echo "test" > /dev/ttyS1
```
But I'm not seeing anything on my Saleae logic analyzer.
Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
```
CONFIG_STM32H7_USART3=y
CONFIG_STM32H7_USART6=y
CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_MCU_SERIAL=y
CONFIG_STANDARD_SERIAL=y
CONFIG_SERIAL_NPOLLWAITERS=4
CONFIG_USART3_SERIAL_CONSOLE=y
CONFIG_USART3_SERIALDRIVER=y
CONFIG_USART6_SERIALDRIVER=y
CONFIG_USART6_RXBUFSIZE=252
CONFIG_USART6_TXBUFSIZE=252
CONFIG_USART6_BAUD=115200
CONFIG_USART6_BITS=8
CONFIG_USART6_PARITY=0
CONFIG_USART6_2STOP=0
```
In my board.h I have this configured for the UART6:
```
/* USART6*/
#define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6 AF7
*/
#define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7 AF7
*/
```
Which is based on this config:
https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this
in ST user manual and datasheets. And it's similar to the initialization of
that UART in the linum-stm32h753zi:
https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
And of course I've configured my Saleae logic analyzer to use 115200
baudrate, 8bit, no parity bit.
[image: image.png]
And here's the NSH where I try to send data down the UART6:
[image: image.png]
But nothing happens on my Saleae.
I'm at the point of going through GDB and checking if there's indeed data
being written down the register, but I thought I'd ask the community for
guidance in resolving this issue in parallel.
Thanks in advance!
Best regards,
Ludovic Vanasse
*Embedded Software Developper*
1 514 475-0447
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by Tomek CEDRO <to...@cedro.info>.
I have STM32 NUCLEO-H755ZI-Q if anyone needs some testing on that board :-)
Tomek
On Wed, Aug 13, 2025 at 6:19 AM karukkuvel Raj Deivasundaram
<ka...@killisbird.com> wrote:
>
> Hi,
>
> Maybe little out of topic to this thread:
>
> If you don't use the cryptographic hash hardware in h753zi, you can use the firmware developed for h743 in h753, as both chips are pin to pin same.
>
> Thanks and Regards
> Karukkuvel Raj D
> Flight Controls Engineer
>
> ________________________________
> From: vinicius may <hw...@gmail.com>
> Sent: Wednesday, August 13, 2025 2:22 AM
> To: dev@nuttx.apache.org <de...@nuttx.apache.org>
> Subject: Re: Port of Nucleo-H7543ZI - Issue with UART6
>
> Im also doing the port for this st kit. Let me check on my side as well
> what is happening:)
>
> On Tue, Aug 12, 2025, 10:44 PM Tomek CEDRO <to...@cedro.info> wrote:
>
> > Working long hours eh? Have fun!! =)
> > Tomek
> >
> >
> > On Tue, Aug 12, 2025 at 10:23 PM Ludovic Vanasse
> > <lv...@luxaerobot.com> wrote:
> > >
> > > Well, it's a bit embarrassing, but I found the issue. I'm sorry for not
> > having thought of that before.
> > >
> > > The issue was that the `echo` command I was doing were enough
> > information for my logic analyzer to pick up. If I tried the
> > `serialblaster` I was able to see data on the line. I've confirmed it
> > worked with the `echo` command, just that I needed a longer string. I was
> > not expecting this to be an issue.
> > >
> > > Sorry again everybody for the disturbance, and thank you for your
> > understanding.
> > >
> > > Ludovic Vanasse
> > >
> > > Embedded Software Developper
> > >
> > > 1 514 475-0447
> > >
> > >
> > >
> > > On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <lv...@luxaerobot.com>
> > wrote:
> > >>
> > >> Hi everybody,
> > >>
> > >> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
> > Nucelo-H743ZI. It's going pretty well.
> > >>
> > >> But now I feel like I've hit a wall, and I am coming here to see if
> > anybody has an idea as to what might be the issue.
> > >>
> > >> I'm planning to use NuttX for High Altitude balloons, and I'm preparing
> > the groundwork for the rest of my team to then split the work between us.
> > Which involve interacting with SATCOM modules, GPS, radios, etc.
> > >>
> > >> And I'm trying to do something very basic, but I'm having issues. I
> > want to be able to validate that the UART6 is working well, so I can
> > validate that the porting is working for this peripheral. And I'm trying to
> > simply send some data down the line with nsh. With this command:
> > >>
> > >> ```
> > >> nsh> echo "test" > /dev/ttyS1
> > >> ```
> > >>
> > >> But I'm not seeing anything on my Saleae logic analyzer.
> > >>
> > >> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
> > >>
> > >> ```
> > >> CONFIG_STM32H7_USART3=y
> > >> CONFIG_STM32H7_USART6=y
> > >>
> > >> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
> > >> CONFIG_SERIAL=y
> > >> CONFIG_SERIAL_CONSOLE=y
> > >> CONFIG_MCU_SERIAL=y
> > >> CONFIG_STANDARD_SERIAL=y
> > >> CONFIG_SERIAL_NPOLLWAITERS=4
> > >> CONFIG_USART3_SERIAL_CONSOLE=y
> > >> CONFIG_USART3_SERIALDRIVER=y
> > >> CONFIG_USART6_SERIALDRIVER=y
> > >>
> > >> CONFIG_USART6_RXBUFSIZE=252
> > >> CONFIG_USART6_TXBUFSIZE=252
> > >> CONFIG_USART6_BAUD=115200
> > >> CONFIG_USART6_BITS=8
> > >> CONFIG_USART6_PARITY=0
> > >> CONFIG_USART6_2STOP=0
> > >> ```
> > >>
> > >> In my board.h I have this configured for the UART6:
> > >>
> > >> ```
> > >> /* USART6*/
> > >> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6
> > AF7 */
> > >> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7
> > AF7 */
> > >> ```
> > >> Which is based on this config:
> > https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this
> > in ST user manual and datasheets. And it's similar to the initialization of
> > that UART in the linum-stm32h753zi:
> > https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
> > >>
> > >> And of course I've configured my Saleae logic analyzer to use 115200
> > baudrate, 8bit, no parity bit.
> > >>
> > >>
> > >>
> > >>
> > >> And here's the NSH where I try to send data down the UART6:
> > >>
> > >> But nothing happens on my Saleae.
> > >>
> > >> I'm at the point of going through GDB and checking if there's indeed
> > data being written down the register, but I thought I'd ask the community
> > for guidance in resolving this issue in parallel.
> > >>
> > >> Thanks in advance!
> > >>
> > >> Best regards,
> > >>
> > >> Ludovic Vanasse
> > >>
> > >> Embedded Software Developper
> > >>
> > >> 1 514 475-0447
> >
> >
> >
> > --
> > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
> >
--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by Ludovic Vanasse <lu...@gmail.com>.
> If you don't use the cryptographic hash hardware in h753zi, you can use
the firmware developed for h743 in h753, as both chips are pin to pin same.
This is basically what I'm doing at the moment, there’s some change that I
have done for the peripheral. But it worked almost out of the box.
Ludovic Vanasse
ludovicvanasse@gmail.com
On Wed, Aug 13, 2025 at 12:19 AM karukkuvel Raj Deivasundaram <
karukkuvelraj.deivasundaram@killisbird.com> wrote:
> Hi,
>
> Maybe little out of topic to this thread:
>
> If you don't use the cryptographic hash hardware in h753zi, you can use
> the firmware developed for h743 in h753, as both chips are pin to pin same.
>
> Thanks and Regards
> Karukkuvel Raj D
> Flight Controls Engineer
>
> ------------------------------
> *From:* vinicius may <hw...@gmail.com>
> *Sent:* Wednesday, August 13, 2025 2:22 AM
> *To:* dev@nuttx.apache.org <de...@nuttx.apache.org>
> *Subject:* Re: Port of Nucleo-H7543ZI - Issue with UART6
>
> Im also doing the port for this st kit. Let me check on my side as well
> what is happening:)
>
> On Tue, Aug 12, 2025, 10:44 PM Tomek CEDRO <to...@cedro.info> wrote:
>
> > Working long hours eh? Have fun!! =)
> > Tomek
> >
> >
> > On Tue, Aug 12, 2025 at 10:23 PM Ludovic Vanasse
> > <lv...@luxaerobot.com> wrote:
> > >
> > > Well, it's a bit embarrassing, but I found the issue. I'm sorry for not
> > having thought of that before.
> > >
> > > The issue was that the `echo` command I was doing were enough
> > information for my logic analyzer to pick up. If I tried the
> > `serialblaster` I was able to see data on the line. I've confirmed it
> > worked with the `echo` command, just that I needed a longer string. I was
> > not expecting this to be an issue.
> > >
> > > Sorry again everybody for the disturbance, and thank you for your
> > understanding.
> > >
> > > Ludovic Vanasse
> > >
> > > Embedded Software Developper
> > >
> > > 1 514 475-0447
> > >
> > >
> > >
> > > On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <
> lvanasse@luxaerobot.com>
> > wrote:
> > >>
> > >> Hi everybody,
> > >>
> > >> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
> > Nucelo-H743ZI. It's going pretty well.
> > >>
> > >> But now I feel like I've hit a wall, and I am coming here to see if
> > anybody has an idea as to what might be the issue.
> > >>
> > >> I'm planning to use NuttX for High Altitude balloons, and I'm
> preparing
> > the groundwork for the rest of my team to then split the work between us.
> > Which involve interacting with SATCOM modules, GPS, radios, etc.
> > >>
> > >> And I'm trying to do something very basic, but I'm having issues. I
> > want to be able to validate that the UART6 is working well, so I can
> > validate that the porting is working for this peripheral. And I'm trying
> to
> > simply send some data down the line with nsh. With this command:
> > >>
> > >> ```
> > >> nsh> echo "test" > /dev/ttyS1
> > >> ```
> > >>
> > >> But I'm not seeing anything on my Saleae logic analyzer.
> > >>
> > >> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
> > >>
> > >> ```
> > >> CONFIG_STM32H7_USART3=y
> > >> CONFIG_STM32H7_USART6=y
> > >>
> > >> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
> > >> CONFIG_SERIAL=y
> > >> CONFIG_SERIAL_CONSOLE=y
> > >> CONFIG_MCU_SERIAL=y
> > >> CONFIG_STANDARD_SERIAL=y
> > >> CONFIG_SERIAL_NPOLLWAITERS=4
> > >> CONFIG_USART3_SERIAL_CONSOLE=y
> > >> CONFIG_USART3_SERIALDRIVER=y
> > >> CONFIG_USART6_SERIALDRIVER=y
> > >>
> > >> CONFIG_USART6_RXBUFSIZE=252
> > >> CONFIG_USART6_TXBUFSIZE=252
> > >> CONFIG_USART6_BAUD=115200
> > >> CONFIG_USART6_BITS=8
> > >> CONFIG_USART6_PARITY=0
> > >> CONFIG_USART6_2STOP=0
> > >> ```
> > >>
> > >> In my board.h I have this configured for the UART6:
> > >>
> > >> ```
> > >> /* USART6*/
> > >> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6
> > AF7 */
> > >> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7
> > AF7 */
> > >> ```
> > >> Which is based on this config:
> > https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed
> this
> > in ST user manual and datasheets. And it's similar to the initialization
> of
> > that UART in the linum-stm32h753zi:
> >
> https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
> > >>
> > >> And of course I've configured my Saleae logic analyzer to use 115200
> > baudrate, 8bit, no parity bit.
> > >>
> > >>
> > >>
> > >>
> > >> And here's the NSH where I try to send data down the UART6:
> > >>
> > >> But nothing happens on my Saleae.
> > >>
> > >> I'm at the point of going through GDB and checking if there's indeed
> > data being written down the register, but I thought I'd ask the community
> > for guidance in resolving this issue in parallel.
> > >>
> > >> Thanks in advance!
> > >>
> > >> Best regards,
> > >>
> > >> Ludovic Vanasse
> > >>
> > >> Embedded Software Developper
> > >>
> > >> 1 514 475-0447
> >
> >
> >
> > --
> > CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
> >
>
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by karukkuvel Raj Deivasundaram <ka...@killisbird.com>.
Hi,
Maybe little out of topic to this thread:
If you don't use the cryptographic hash hardware in h753zi, you can use the firmware developed for h743 in h753, as both chips are pin to pin same.
Thanks and Regards
Karukkuvel Raj D
Flight Controls Engineer
[cid:c40a7bc9-11a6-44d7-8383-d4cb413964dd]
________________________________
From: vinicius may <hw...@gmail.com>
Sent: Wednesday, August 13, 2025 2:22 AM
To: dev@nuttx.apache.org <de...@nuttx.apache.org>
Subject: Re: Port of Nucleo-H7543ZI - Issue with UART6
Im also doing the port for this st kit. Let me check on my side as well
what is happening:)
On Tue, Aug 12, 2025, 10:44 PM Tomek CEDRO <to...@cedro.info> wrote:
> Working long hours eh? Have fun!! =)
> Tomek
>
>
> On Tue, Aug 12, 2025 at 10:23 PM Ludovic Vanasse
> <lv...@luxaerobot.com> wrote:
> >
> > Well, it's a bit embarrassing, but I found the issue. I'm sorry for not
> having thought of that before.
> >
> > The issue was that the `echo` command I was doing were enough
> information for my logic analyzer to pick up. If I tried the
> `serialblaster` I was able to see data on the line. I've confirmed it
> worked with the `echo` command, just that I needed a longer string. I was
> not expecting this to be an issue.
> >
> > Sorry again everybody for the disturbance, and thank you for your
> understanding.
> >
> > Ludovic Vanasse
> >
> > Embedded Software Developper
> >
> > 1 514 475-0447
> >
> >
> >
> > On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <lv...@luxaerobot.com>
> wrote:
> >>
> >> Hi everybody,
> >>
> >> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
> Nucelo-H743ZI. It's going pretty well.
> >>
> >> But now I feel like I've hit a wall, and I am coming here to see if
> anybody has an idea as to what might be the issue.
> >>
> >> I'm planning to use NuttX for High Altitude balloons, and I'm preparing
> the groundwork for the rest of my team to then split the work between us.
> Which involve interacting with SATCOM modules, GPS, radios, etc.
> >>
> >> And I'm trying to do something very basic, but I'm having issues. I
> want to be able to validate that the UART6 is working well, so I can
> validate that the porting is working for this peripheral. And I'm trying to
> simply send some data down the line with nsh. With this command:
> >>
> >> ```
> >> nsh> echo "test" > /dev/ttyS1
> >> ```
> >>
> >> But I'm not seeing anything on my Saleae logic analyzer.
> >>
> >> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
> >>
> >> ```
> >> CONFIG_STM32H7_USART3=y
> >> CONFIG_STM32H7_USART6=y
> >>
> >> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
> >> CONFIG_SERIAL=y
> >> CONFIG_SERIAL_CONSOLE=y
> >> CONFIG_MCU_SERIAL=y
> >> CONFIG_STANDARD_SERIAL=y
> >> CONFIG_SERIAL_NPOLLWAITERS=4
> >> CONFIG_USART3_SERIAL_CONSOLE=y
> >> CONFIG_USART3_SERIALDRIVER=y
> >> CONFIG_USART6_SERIALDRIVER=y
> >>
> >> CONFIG_USART6_RXBUFSIZE=252
> >> CONFIG_USART6_TXBUFSIZE=252
> >> CONFIG_USART6_BAUD=115200
> >> CONFIG_USART6_BITS=8
> >> CONFIG_USART6_PARITY=0
> >> CONFIG_USART6_2STOP=0
> >> ```
> >>
> >> In my board.h I have this configured for the UART6:
> >>
> >> ```
> >> /* USART6*/
> >> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6
> AF7 */
> >> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7
> AF7 */
> >> ```
> >> Which is based on this config:
> https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this
> in ST user manual and datasheets. And it's similar to the initialization of
> that UART in the linum-stm32h753zi:
> https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
> >>
> >> And of course I've configured my Saleae logic analyzer to use 115200
> baudrate, 8bit, no parity bit.
> >>
> >>
> >>
> >>
> >> And here's the NSH where I try to send data down the UART6:
> >>
> >> But nothing happens on my Saleae.
> >>
> >> I'm at the point of going through GDB and checking if there's indeed
> data being written down the register, but I thought I'd ask the community
> for guidance in resolving this issue in parallel.
> >>
> >> Thanks in advance!
> >>
> >> Best regards,
> >>
> >> Ludovic Vanasse
> >>
> >> Embedded Software Developper
> >>
> >> 1 514 475-0447
>
>
>
> --
> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
>
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by vinicius may <hw...@gmail.com>.
Im also doing the port for this st kit. Let me check on my side as well
what is happening:)
On Tue, Aug 12, 2025, 10:44 PM Tomek CEDRO <to...@cedro.info> wrote:
> Working long hours eh? Have fun!! =)
> Tomek
>
>
> On Tue, Aug 12, 2025 at 10:23 PM Ludovic Vanasse
> <lv...@luxaerobot.com> wrote:
> >
> > Well, it's a bit embarrassing, but I found the issue. I'm sorry for not
> having thought of that before.
> >
> > The issue was that the `echo` command I was doing were enough
> information for my logic analyzer to pick up. If I tried the
> `serialblaster` I was able to see data on the line. I've confirmed it
> worked with the `echo` command, just that I needed a longer string. I was
> not expecting this to be an issue.
> >
> > Sorry again everybody for the disturbance, and thank you for your
> understanding.
> >
> > Ludovic Vanasse
> >
> > Embedded Software Developper
> >
> > 1 514 475-0447
> >
> >
> >
> > On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <lv...@luxaerobot.com>
> wrote:
> >>
> >> Hi everybody,
> >>
> >> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
> Nucelo-H743ZI. It's going pretty well.
> >>
> >> But now I feel like I've hit a wall, and I am coming here to see if
> anybody has an idea as to what might be the issue.
> >>
> >> I'm planning to use NuttX for High Altitude balloons, and I'm preparing
> the groundwork for the rest of my team to then split the work between us.
> Which involve interacting with SATCOM modules, GPS, radios, etc.
> >>
> >> And I'm trying to do something very basic, but I'm having issues. I
> want to be able to validate that the UART6 is working well, so I can
> validate that the porting is working for this peripheral. And I'm trying to
> simply send some data down the line with nsh. With this command:
> >>
> >> ```
> >> nsh> echo "test" > /dev/ttyS1
> >> ```
> >>
> >> But I'm not seeing anything on my Saleae logic analyzer.
> >>
> >> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
> >>
> >> ```
> >> CONFIG_STM32H7_USART3=y
> >> CONFIG_STM32H7_USART6=y
> >>
> >> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
> >> CONFIG_SERIAL=y
> >> CONFIG_SERIAL_CONSOLE=y
> >> CONFIG_MCU_SERIAL=y
> >> CONFIG_STANDARD_SERIAL=y
> >> CONFIG_SERIAL_NPOLLWAITERS=4
> >> CONFIG_USART3_SERIAL_CONSOLE=y
> >> CONFIG_USART3_SERIALDRIVER=y
> >> CONFIG_USART6_SERIALDRIVER=y
> >>
> >> CONFIG_USART6_RXBUFSIZE=252
> >> CONFIG_USART6_TXBUFSIZE=252
> >> CONFIG_USART6_BAUD=115200
> >> CONFIG_USART6_BITS=8
> >> CONFIG_USART6_PARITY=0
> >> CONFIG_USART6_2STOP=0
> >> ```
> >>
> >> In my board.h I have this configured for the UART6:
> >>
> >> ```
> >> /* USART6*/
> >> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6
> AF7 */
> >> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7
> AF7 */
> >> ```
> >> Which is based on this config:
> https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this
> in ST user manual and datasheets. And it's similar to the initialization of
> that UART in the linum-stm32h753zi:
> https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
> >>
> >> And of course I've configured my Saleae logic analyzer to use 115200
> baudrate, 8bit, no parity bit.
> >>
> >>
> >>
> >>
> >> And here's the NSH where I try to send data down the UART6:
> >>
> >> But nothing happens on my Saleae.
> >>
> >> I'm at the point of going through GDB and checking if there's indeed
> data being written down the register, but I thought I'd ask the community
> for guidance in resolving this issue in parallel.
> >>
> >> Thanks in advance!
> >>
> >> Best regards,
> >>
> >> Ludovic Vanasse
> >>
> >> Embedded Software Developper
> >>
> >> 1 514 475-0447
>
>
>
> --
> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
>
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by Ludovic Vanasse <lu...@gmail.com>.
Haha, I wish I was in EET ;), but I'm located in Quebec, Canada :), so it
was just 16:00.
Ludovic Vanasse
ludovicvanasse@gmail.com
On Tue, Aug 12, 2025 at 4:44 PM Tomek CEDRO <to...@cedro.info> wrote:
> Working long hours eh? Have fun!! =)
> Tomek
>
>
> On Tue, Aug 12, 2025 at 10:23 PM Ludovic Vanasse
> <lv...@luxaerobot.com> wrote:
> >
> > Well, it's a bit embarrassing, but I found the issue. I'm sorry for not
> having thought of that before.
> >
> > The issue was that the `echo` command I was doing were enough
> information for my logic analyzer to pick up. If I tried the
> `serialblaster` I was able to see data on the line. I've confirmed it
> worked with the `echo` command, just that I needed a longer string. I was
> not expecting this to be an issue.
> >
> > Sorry again everybody for the disturbance, and thank you for your
> understanding.
> >
> > Ludovic Vanasse
> >
> > Embedded Software Developper
> >
> > 1 514 475-0447
> >
> >
> >
> > On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <lv...@luxaerobot.com>
> wrote:
> >>
> >> Hi everybody,
> >>
> >> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
> Nucelo-H743ZI. It's going pretty well.
> >>
> >> But now I feel like I've hit a wall, and I am coming here to see if
> anybody has an idea as to what might be the issue.
> >>
> >> I'm planning to use NuttX for High Altitude balloons, and I'm preparing
> the groundwork for the rest of my team to then split the work between us.
> Which involve interacting with SATCOM modules, GPS, radios, etc.
> >>
> >> And I'm trying to do something very basic, but I'm having issues. I
> want to be able to validate that the UART6 is working well, so I can
> validate that the porting is working for this peripheral. And I'm trying to
> simply send some data down the line with nsh. With this command:
> >>
> >> ```
> >> nsh> echo "test" > /dev/ttyS1
> >> ```
> >>
> >> But I'm not seeing anything on my Saleae logic analyzer.
> >>
> >> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
> >>
> >> ```
> >> CONFIG_STM32H7_USART3=y
> >> CONFIG_STM32H7_USART6=y
> >>
> >> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
> >> CONFIG_SERIAL=y
> >> CONFIG_SERIAL_CONSOLE=y
> >> CONFIG_MCU_SERIAL=y
> >> CONFIG_STANDARD_SERIAL=y
> >> CONFIG_SERIAL_NPOLLWAITERS=4
> >> CONFIG_USART3_SERIAL_CONSOLE=y
> >> CONFIG_USART3_SERIALDRIVER=y
> >> CONFIG_USART6_SERIALDRIVER=y
> >>
> >> CONFIG_USART6_RXBUFSIZE=252
> >> CONFIG_USART6_TXBUFSIZE=252
> >> CONFIG_USART6_BAUD=115200
> >> CONFIG_USART6_BITS=8
> >> CONFIG_USART6_PARITY=0
> >> CONFIG_USART6_2STOP=0
> >> ```
> >>
> >> In my board.h I have this configured for the UART6:
> >>
> >> ```
> >> /* USART6*/
> >> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6
> AF7 */
> >> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7
> AF7 */
> >> ```
> >> Which is based on this config:
> https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this
> in ST user manual and datasheets. And it's similar to the initialization of
> that UART in the linum-stm32h753zi:
> https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
> >>
> >> And of course I've configured my Saleae logic analyzer to use 115200
> baudrate, 8bit, no parity bit.
> >>
> >>
> >>
> >>
> >> And here's the NSH where I try to send data down the UART6:
> >>
> >> But nothing happens on my Saleae.
> >>
> >> I'm at the point of going through GDB and checking if there's indeed
> data being written down the register, but I thought I'd ask the community
> for guidance in resolving this issue in parallel.
> >>
> >> Thanks in advance!
> >>
> >> Best regards,
> >>
> >> Ludovic Vanasse
> >>
> >> Embedded Software Developper
> >>
> >> 1 514 475-0447
>
>
>
> --
> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
>
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by Tomek CEDRO <to...@cedro.info>.
Working long hours eh? Have fun!! =)
Tomek
On Tue, Aug 12, 2025 at 10:23 PM Ludovic Vanasse
<lv...@luxaerobot.com> wrote:
>
> Well, it's a bit embarrassing, but I found the issue. I'm sorry for not having thought of that before.
>
> The issue was that the `echo` command I was doing were enough information for my logic analyzer to pick up. If I tried the `serialblaster` I was able to see data on the line. I've confirmed it worked with the `echo` command, just that I needed a longer string. I was not expecting this to be an issue.
>
> Sorry again everybody for the disturbance, and thank you for your understanding.
>
> Ludovic Vanasse
>
> Embedded Software Developper
>
> 1 514 475-0447
>
>
>
> On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <lv...@luxaerobot.com> wrote:
>>
>> Hi everybody,
>>
>> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the Nucelo-H743ZI. It's going pretty well.
>>
>> But now I feel like I've hit a wall, and I am coming here to see if anybody has an idea as to what might be the issue.
>>
>> I'm planning to use NuttX for High Altitude balloons, and I'm preparing the groundwork for the rest of my team to then split the work between us. Which involve interacting with SATCOM modules, GPS, radios, etc.
>>
>> And I'm trying to do something very basic, but I'm having issues. I want to be able to validate that the UART6 is working well, so I can validate that the porting is working for this peripheral. And I'm trying to simply send some data down the line with nsh. With this command:
>>
>> ```
>> nsh> echo "test" > /dev/ttyS1
>> ```
>>
>> But I'm not seeing anything on my Saleae logic analyzer.
>>
>> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
>>
>> ```
>> CONFIG_STM32H7_USART3=y
>> CONFIG_STM32H7_USART6=y
>>
>> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
>> CONFIG_SERIAL=y
>> CONFIG_SERIAL_CONSOLE=y
>> CONFIG_MCU_SERIAL=y
>> CONFIG_STANDARD_SERIAL=y
>> CONFIG_SERIAL_NPOLLWAITERS=4
>> CONFIG_USART3_SERIAL_CONSOLE=y
>> CONFIG_USART3_SERIALDRIVER=y
>> CONFIG_USART6_SERIALDRIVER=y
>>
>> CONFIG_USART6_RXBUFSIZE=252
>> CONFIG_USART6_TXBUFSIZE=252
>> CONFIG_USART6_BAUD=115200
>> CONFIG_USART6_BITS=8
>> CONFIG_USART6_PARITY=0
>> CONFIG_USART6_2STOP=0
>> ```
>>
>> In my board.h I have this configured for the UART6:
>>
>> ```
>> /* USART6*/
>> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6 AF7 */
>> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7 AF7 */
>> ```
>> Which is based on this config: https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this in ST user manual and datasheets. And it's similar to the initialization of that UART in the linum-stm32h753zi: https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
>>
>> And of course I've configured my Saleae logic analyzer to use 115200 baudrate, 8bit, no parity bit.
>>
>>
>>
>>
>> And here's the NSH where I try to send data down the UART6:
>>
>> But nothing happens on my Saleae.
>>
>> I'm at the point of going through GDB and checking if there's indeed data being written down the register, but I thought I'd ask the community for guidance in resolving this issue in parallel.
>>
>> Thanks in advance!
>>
>> Best regards,
>>
>> Ludovic Vanasse
>>
>> Embedded Software Developper
>>
>> 1 514 475-0447
--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by Ludovic Vanasse <lv...@luxaerobot.com>.
Well, it's a bit embarrassing, but I found the issue. I'm sorry for not
having thought of that before.
The issue was that the `echo` command I was doing were enough information
for my logic analyzer to pick up. If I tried the `serialblaster` I was able
to see data on the line. I've confirmed it worked with the `echo` command,
just that I needed a longer string. I was not expecting this to be an issue.
Sorry again everybody for the disturbance, and thank you for your
understanding.
Ludovic Vanasse
*Embedded Software Developper*
1 514 475-0447
On Tue, Aug 12, 2025 at 2:33 PM Ludovic Vanasse <lv...@luxaerobot.com>
wrote:
> Hi everybody,
>
> I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the
> Nucelo-H743ZI. It's going pretty well.
>
> But now I feel like I've hit a wall, and I am coming here to see if
> anybody has an idea as to what might be the issue.
>
> I'm planning to use NuttX for High Altitude balloons, and I'm preparing
> the groundwork for the rest of my team to then split the work between us.
> Which involve interacting with SATCOM modules, GPS, radios, etc.
>
> And I'm trying to do something very basic, but I'm having issues. I want
> to be able to validate that the UART6 is working well, so I can validate
> that the porting is working for this peripheral. And I'm trying to simply
> send some data down the line with nsh. With this command:
>
> ```
> nsh> echo "test" > /dev/ttyS1
> ```
>
> But I'm not seeing anything on my Saleae logic analyzer.
>
> Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
>
> ```
> CONFIG_STM32H7_USART3=y
> CONFIG_STM32H7_USART6=y
>
> CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
> CONFIG_SERIAL=y
> CONFIG_SERIAL_CONSOLE=y
> CONFIG_MCU_SERIAL=y
> CONFIG_STANDARD_SERIAL=y
> CONFIG_SERIAL_NPOLLWAITERS=4
> CONFIG_USART3_SERIAL_CONSOLE=y
> CONFIG_USART3_SERIALDRIVER=y
> CONFIG_USART6_SERIALDRIVER=y
>
> CONFIG_USART6_RXBUFSIZE=252
> CONFIG_USART6_TXBUFSIZE=252
> CONFIG_USART6_BAUD=115200
> CONFIG_USART6_BITS=8
> CONFIG_USART6_PARITY=0
> CONFIG_USART6_2STOP=0
> ```
>
> In my board.h I have this configured for the UART6:
>
> ```
> /* USART6*/
> #define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6 AF7
> */
> #define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7 AF7
> */
> ```
> Which is based on this config:
> https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this
> in ST user manual and datasheets. And it's similar to the initialization of
> that UART in the linum-stm32h753zi:
> https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
>
> And of course I've configured my Saleae logic analyzer to use 115200
> baudrate, 8bit, no parity bit.
>
> [image: image.png]
>
>
> And here's the NSH where I try to send data down the UART6:
> [image: image.png]
>
> But nothing happens on my Saleae.
>
> I'm at the point of going through GDB and checking if there's indeed data
> being written down the register, but I thought I'd ask the community for
> guidance in resolving this issue in parallel.
>
> Thanks in advance!
>
> Best regards,
>
> Ludovic Vanasse
>
>
> *Embedded Software Developper*
>
> 1 514 475-0447
>
Re: Port of Nucleo-H7543ZI - Issue with UART6
Posted by Gregory Nutt <sp...@gmail.com>.
Is the UART6 Clock enabled?
Did you configure the GPIO pins for UART6 operation? On the Nucleo-H753ZI board, UART6 TX/RX is probably on PD8/PD9. UART6 is an alternate function of those pins.
________________________________
From: Ludovic Vanasse <lv...@luxaerobot.com>
Sent: Tuesday, August 12, 2025 11:33 AM
To: dev@nuttx.apache.org <de...@nuttx.apache.org>
Subject: Port of Nucleo-H7543ZI - Issue with UART6
Hi everybody,
I'm working on porting NuttX to the Nucelo-H753ZI and basing it on the Nucelo-H743ZI. It's going pretty well.
But now I feel like I've hit a wall, and I am coming here to see if anybody has an idea as to what might be the issue.
I'm planning to use NuttX for High Altitude balloons, and I'm preparing the groundwork for the rest of my team to then split the work between us. Which involve interacting with SATCOM modules, GPS, radios, etc.
And I'm trying to do something very basic, but I'm having issues. I want to be able to validate that the UART6 is working well, so I can validate that the porting is working for this peripheral. And I'm trying to simply send some data down the line with nsh. With this command:
```
nsh> echo "test" > /dev/ttyS1
```
But I'm not seeing anything on my Saleae logic analyzer.
Here's the configuration I'm using for the UART on the Nucleo-H753ZI:
```
CONFIG_STM32H7_USART3=y
CONFIG_STM32H7_USART6=y
CONFIG_ARCH_HAVE_SERIAL_TERMIOS=y
CONFIG_SERIAL=y
CONFIG_SERIAL_CONSOLE=y
CONFIG_MCU_SERIAL=y
CONFIG_STANDARD_SERIAL=y
CONFIG_SERIAL_NPOLLWAITERS=4
CONFIG_USART3_SERIAL_CONSOLE=y
CONFIG_USART3_SERIALDRIVER=y
CONFIG_USART6_SERIALDRIVER=y
CONFIG_USART6_RXBUFSIZE=252
CONFIG_USART6_TXBUFSIZE=252
CONFIG_USART6_BAUD=115200
CONFIG_USART6_BITS=8
CONFIG_USART6_PARITY=0
CONFIG_USART6_2STOP=0
```
In my board.h I have this configured for the UART6:
```
/* USART6*/
#define GPIO_USART6_TX (GPIO_USART6_TX_1 | GPIO_SPEED_100MHz) /* PC6 AF7 */
#define GPIO_USART6_RX (GPIO_USART6_RX_1 | GPIO_SPEED_100MHz) /* PC7 AF7 */
```
Which is based on this config: https://os.mbed.com/platforms/ST-Nucleo-H743ZI/, I've also confirmed this in ST user manual and datasheets. And it's similar to the initialization of that UART in the linum-stm32h753zi: https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/linum-stm32h753bi/include/board.h#L379
And of course I've configured my Saleae logic analyzer to use 115200 baudrate, 8bit, no parity bit.
[image.png]
And here's the NSH where I try to send data down the UART6:
[image.png]
But nothing happens on my Saleae.
I'm at the point of going through GDB and checking if there's indeed data being written down the register, but I thought I'd ask the community for guidance in resolving this issue in parallel.
Thanks in advance!
Best regards,
Ludovic Vanasse
Embedded Software Developper
1 514 475-0447
[https://drive.google.com/uc?export=view&id=1C4oeXOxjzz0SdirW122e2_8tXvfNEY13]