STM32 UART4 & UART5 On the STM3210E-EVAL Board- it doesn't work..why??

[rkleine9]

Posted on November 23, 2008 at 16:06

STM32 UART4 & UART5 On the STM3210E-EVAL Board- it doesn't work..why??

[rkleine9]

Posted on May 17, 2011 at 12:53

Hello,

I'm new to the STM32 series microcontroller. I Have an STM3210E-EVAL board and tried the UARTS. UART 1 and 2 are working fine, But I cannot use the # 3,4,and 5 yet. I don't understand. All initialization seem to be correct, but nothing happens.... does anyone have an example using UART 4 or 5? I disconnected the SD card, monitored pin PC10 (UART 4 .TX), initialized alternate function pus_pull for thies pin. Enabled the clock for the UART, Enabled the UART itself... But nothing yet. And the first U(S)ARTS works fine both! Thanks in advance Remco

[16-32micros]

Posted on May 17, 2011 at 12:53

Hi Remco,

Try first to initialize your USART/UART clocks and also the I/O ports connected to their TX and RX lines. Cheers, STOne-32.

[st3]

Posted on May 17, 2011 at 12:53

Quote:

Try first to initialize your USART/UART clocks and also the I/O ports connected to their TX and RX lines.

I think there is a huge hole in both the STM32 documentation and the FWLib in this respect! The section about the USARTs in the User Manual focusses purely on the USART functionality - I can't see anywhere that details clearly, completely, and explicitly what are all the other things that also have to be set up & configured in order to actually use the USARTs! :| Namely:

• The peripheral function clocks
• The GPIO clocks
• The GPIO alternate functions</ul> etc, etc...?