[FreeRTOS+IO] interrupt modes only on highest peripherals?

Kernel
1

simonk87 wrote on Monday, September 23, 2013:

Hello all!

I’m playing with the FreeRTOS demo application on the default LPXExpresso board from Embedded Artists. I’m using demo 2 to write and read files on an sd card. Works perfectly!

Now I’m trying to port the demo 2 to a custom made pcb: the sd card is connected to SSP0 instead of SSP1. I created a new board support package and started the program, the polling mode works fine! But directly after enabling ioctlUSE_ZERO_COPY_TX and ioctlUSE_CIRCULAR_BUFFER_RX I find the processor to jump to the IntDefaultHandler. I’m trying to find out why:

  • There is probably no interrupt handler: I only see the function SSP1_IRQHandler( void ) in “FreeRTOS_lpc17xx_uart.c”. The rest of the file looks very generic with the use of SSPx everywhere.
  • Where is the interrupt handler SSP0 ? Is it not supported in other modes than polling? Or is there some trick that it should fall trough to the latest peripheral?

Setup:

  • I’m using an NXP LPC1769.
  • Latest version of FreeRTOS: 7.5.2
  • I only could find the source for FreeRTOS+IO in the demo itself, it’s not included in the FreeRTOS zip for as far as I could see. In the headers it’s saying version 1.0.1 is this the latest version?

Thank you very much in advance. I would really like to get this running in interrupt mode as well.

Best regards,
Simon Koudijs

Ps. I tried the same for the UART implementation, UART0 is also only working in polling mode. I can only find a interrupt handler for UART3 (UART3_IRQHandler). UART3 works fine.

2

rtel wrote on Monday, September 23, 2013:

The interrupt handler SSP1_IRQHandler is in FreeRTOS_lpc17xx_ssp.c. If you are using SSP 0 you should just be able to change the name of the handler to SSP0_IRQHandler() for it to get called at the appropriate time - then change the accesses to LPC_SSP1 inside the function to instead go to LPC_SSP0.

Probably best to cut and past the entire function, then make the modifications to the copy of the function, so both ports are then supported at the same time.

Regards.

3

simonk87 wrote on Tuesday, September 24, 2013:

Thank you for the information. I implemented the ISR and it now works like it should.

I attached the two adjusted file for someone else that finds this question. Perhaps they can me merged into the main branch of FreeRTOS+IO? I could imagine that more people would benefit from this.

Where do I find the latest version of these files anyway? They are not included in the main FreeRTOS zip. Only in the provided example.

Thanks for the effort, Simon

4

rtel wrote on Tuesday, September 24, 2013:

Those are the latest files - we don’t put them in the main download because they are a bit too chip specific.

Thanks for your attachments.

Regards.