06:02 <borneoa___> The parallel TRACE interface runs at much higher speed than what you can get with SWO, so you can get more ETM traces for your code in execution. On some SoC you can have 16 bits in parallel. But I never found a low cost probe for such interface. Now, wiith GHz class ARM cores, the TRACE interface is not fast enough anymore and ARM proposes a new one. An alternative is to still use SWO but program the ETM to automatically halt

06:02 <borneoa___> and resume the core when the FIFO of the SWO port is full; in this way traces are not lost, but execution is not anymore real time.

06:06 <antto> hmmm

06:07 <antto> the "ideal" way would be that the "trace" thing can "report" the position of the program at every CPU clock cycle, right?

10:54 <borneoa___> antto: there are few things that can be logged. Program counter, memory access... For the PC the ETM makes some compression by logging only the jumps.

10:55 <Haohmaru> ah, clever

10:57 <Haohmaru> well, slowing down the core would be acceptable in cases where you don't deal with time

10:57 <Haohmaru> but probably most interesting firmwares *do* deal with time

10:58 <Haohmaru> mine do ;P~

10:59 <Haohmaru> when i (debug) pause my audio thing - the audio stops, inputs get lost, etc..

11:00 <Haohmaru> it's cool that the I2S periph is made to handle this, it keeps running but it has an option what to do - to repeat the last buffer, or to repeat silence, or something else

11:01 <PaulFertser> borneoa___: (cheap probe) how about https://github.com/GlasgowEmbedded/glasgow ?

11:09 <Haohmaru> and i was afraid my devices have too many color LEDs

11:28 <borneoa___> PaulFertser: I don't see it supporting arm trace signals directly. Only through JTAG, so quite slow

11:30 <Haohmaru> does anyone happen to know if there's something similar to a USB-serial IC, but on the "serial" side i want synchronous (with clock signal)?

11:31 <PaulFertser> borneoa___: hm, I thought they implemented it too. What about orbtrace then?

11:33 <borneoa___> PaulFertser: that looks interesting...