JTAG_UART recognize for no terminal NIOS 2

Question

Hi.I have a problem when JTAG_UART is the default printf and no terminal is open.I want to recognize the  state and block the prints from going out.As I understand the ALTERA_AVALON_JTAG_UART driver has a dedicate flages that detect those situation (No terminal is open) . If so what is the name of the relevant REG and flag?How can I use this flag (is there an API to check its state from all parts of the SW?If I want to block the string from going out in this situation (no terminal open) what is the best way to do it (I don't want to make any change in the altera_avalon_jtag_uart files) from the  application level where it call to the prinft?Thanks.Bar.

kellyjialin_goh · Answer

Hi,Greetings and welcome to Intel's Forum. You may have a look at these links for your reference: 1) Flag Variables: https://www.intel.com/content/www/us/en/docs/programmable/683282/current/standard-build-flag-variables.html2)Guideline to develop Nios II HAL: https://www.intel.com/content/www/us/en/docs/programmable/683146/current/prerequisites-for-hal-device-driver.htmlThank you.Regards,Kelly, Jialin

bar · Answer

HI Kelly.Thanks for your replay.I was talking about flags of the jtag uart reg in the SW. Not about FLAGS of project config.Specific flages that set when ever there is no HOST port connect ( or open) on the JTAG UART on the PC side.RegardsBar.

kellyjialin_goh · Answer

Hi,You may try to disable the SEMIHOSTING flag during compiling to stop the output to JTAG_UART.Here are some additional information for your reference: https://www.intel.com/content/www/us/en/docs/programmable/683126/21-2/enabling-uart-or-semihosting-printout.htmlThank you.Regards,Kelly

bar · Answer

Hello Kelly.I look into that flag.What I found is as follow:1. I only have ALT_SEMIHOSTING opption and it is not define right now at my code.2. The link you send me is for the older version of Nios 2 which has spi tab. I don't have this option so I don't know how can I active/ disactive SEMIHOSTING. How do I do it on Nios || 18.1?RegardsBar.

kellyjialin_goh · Answer

Hi,This feature has been discontinued with the Quartus version you are using. However you may try to use NIOS II booting methods with different flashes based on your needs: https://www.intel.com/content/www/us/en/docs/programmable/683820/current/nios-ii-processor-booting-methods.htmlThank you.Regards,Kelly

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JTAG_UART recognize for no terminal NIOS 2

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