The first time I drew a board, I couldn't burn the program into the JTAG after it was made. I cried

桃凯闻

The first time I drew a board, I couldn't burn the program into the JTAG after it was made. I cried [Copy link]

 

This is the schematic diagram for JTAG, completely copied from TI...

This is my crystal oscillator. I didn't know it at the time... I also put the crystal oscillator on the opposite side, and the SPI signal was also on the other side. I don't know if this is the reason why I can't burn it in...

I have checked the power supply myself, it should be fine, then the CCS test connection succeeds and fails...

The last burning error is this

Please tell me what is going on here...

topwon

Why does your crystal oscillator have 3 signal pins and 1 ground pin?

大秦正声

This is normal. Domestic engineers are 100% likely to encounter pitfalls with Texas Instruments DSP chips. The problem encountered by the OP is quite common.

lzm2008

First make sure the firmware is correct, and then check if there is any poor welding or other reasons.

桃凯闻

topwon posted on 2019-9-23 11:15 Why does your crystal oscillator have 3 signal pins and 1 ground pin?

The 2nd and 4th pins are short-circuited internally, and they are both grounded, so I didn't connect them to the ground...

桃凯闻

Daqin Zhengsheng published on 2019-9-23 11:49 This is normal. Domestic engineers have 100% encountered the pitfalls of Texas Instruments DSP chips. The original poster's problem is quite common.

Does it mean it's a chip problem? . . . I'm a little confused now, the schematic is exactly the same as others

topwon

Tao Kaiwen published on 2019-9-23 13:54 The 2nd and 4th pins are short-circuited internally, both are grounded, so I didn't connect them to the ground...

First check whether the crystal oscillator works normally after power-on, whether the frequency is correct, and whether the waveform is good.

桃凯闻

topwon posted on 2019-9-23 14:08 First check whether the crystal oscillator works normally after power-on, whether the frequency is correct, and whether the waveform is good.

Yes, I checked it, the crystal oscillator is stable

29447945

From here, are you sure the reset is OK? Wouldn't it always reset if you connect a resistor directly to ground?

qwqwqw2088

It may not be a PC wiring problem

In principle, you should check

桃凯闻

29447945 Published on 2019-9-23 14:38 From here, are you sure that the reset is OK? Wouldn't it always reset if you directly connect a resistor to ground?

Pull-down resistors won't work...

29447945

Tao Kaiwen published on 2019-9-23 21:19 Pull-down resistors won't work...

I don't know which chip you have, and I don't know if this is the reset pin. If it is the reset pin, pull the resistor down to ground directly, and the reset low level is valid, then it will always be in the reset state.

桃凯闻

qwqwqw2088 posted on 2019-9-23 15:22 It may not be a problem with the PC wiring. In principle, it should be carefully checked

Expert, I checked again and found that the 3.3V power supply I provided to IO and the power supply to JTAG are not isolated, but are the same power supply. Could this be the reason?

ddlxiaoxu

29447945 Published on 2019-9-24 08:41 I don't know which chip you have, and I don't know if this is the reset pin. If it is the reset pin, pull the resistor down to the ground directly, and the reset low level is valid, then...

I guess it's 28379. TRST is used by JTAG, it seems like the boot mode selection. The reset pin is 69 XRS

桃凯闻

ddlxiaoxu posted on 2019-9-24 10:24 It is probably 28379. TRST is used for JTAG, which seems to be the boot mode selection. The reset pin is 69 XRS

It's 379... JTAG should be fine.

ddlxiaoxu

Tao Kaiwen published on 2019-9-24 21:22 It is 379... JTAG should be no problem eight

I can't tell. I'm also drawing a 28379 board for fun. Seeing your problem, I don't dare to draw any more. I compared it with the schematic diagram of the launchpad. There are no pull-up resistors for TCK, TMS, TDI and the series resistor for TDO (it should not be related). Check if there is any poor welding at the XRS position. There are also such problems on the Internet. Check if there is any difference in the boot position link. Did you choose the wrong startup mode or something? https://en.eeworld.com/bbs/thread-446475-1-1.html

generalcircuits

Tao Kaiwen published on 2019-9-23 13:55 Does it mean that it is a problem with the chip? . . . I am a little confused now, the schematic diagram is exactly the same as others

Try changing the chip.

zhuyebb

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