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Altera_Forum
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14 years ago

JTAG USB dropping data when printing to terminal

I've got a system setup to print out ADC samples via a NIOS processor (standard) and JTAG USB. The ADC samples at 48Khz and the samples are streamed to the NIOS processor to be printed through PIO. ...
Altera_Forum's avatar
Altera_Forum
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14 years ago

Increasing the JTAG UART buffer from the default 64 bytes to 8192 bytes shows no difference. Changing from a NIOS/s to NIOS/f processor causes the same numbers to be repeated every time (ie they are never updated as shown below): 


1hz    10hz    100hz   1khz   10khz  100khz   1Mhz   27Mhz  50Mhz   C counter
74	24	40	96	40	95	33	18	37	1 
74	24	40	96	40	95	33	18	37	2
74	24	40	96	40	95	33	18	37	3
74	24	40	96	40	95	33	18	37	4
74	24	40	96	40	95	33	18	37	5
74	24	40	96	40	95	33	18	37	6
74	24	40	96	40	95	33	18	37	7
74	24	40	96	40	95	33	18	37	8
74	24	40	96	40	95	33	18	37	9
74	24	40	96	40	95	33	18	37	10
74	24	40	96	40	95	33	18	37	11
74	24	40	96	40	95	33	18	37	12
74	24	40	96	40	95	33	18	37	13
74	24	40	96	40	95	33	18	37	14
74	24	40	96	40	95	33	18	37	15
74	24	40	96	40	95	33	18	37	16

NIOS/s, 8192 JTAG UART buffer: 


1hz    10hz    100hz   1khz   10khz  100khz   1Mhz   27Mhz  50Mhz   C counter
39	83	9	92	0	97	54	96	76	1991
39	83	9	93	16	53	16	85	2	1992
39	83	9	94	19	86	47	97	5	1993
39	83	10	95	35	44	28	97	79	1994
39	83	10	96	39	80	83	49	70	1995
39	83	10	99	67	55	41	53	37	1996
39	83	10	99	70	91	95	68	56	1997
39	83	10	101	95	28	75	52	0	1998