Microcontrollers

Forum Post: RE: Emulator selection

Gautam Iyer — Wed, 19 Jun 2013 04:19:00 GMT

Hi Ben,

Stick to Spectrum Digital products, as they provide good support. TI also recommends it :)

Regards,

Gautam

Forum Post: RE: LM3S5791-IQC80-C5 VDDC range

Peng Liu50174 — Wed, 19 Jun 2013 04:12:00 GMT

Hi, Sue,

What is the consequence if still using external 1.2V LDO(per C3 work round) to supply the C5 chip. Will this damage the chip in long term?

We released the board quite a long time ago, so we are trying no to change the PCB design if possible. Thanks,

Peng

Forum Post: RE: issue with RM48L952

Vaidyanathan Balakrishnan — Wed, 19 Jun 2013 03:07:00 GMT

Zhaohong,

Thanks for the response. To anwswer your question: we use three SPI devices, the MCP23S17 (IO expander), DAC8568( on SPI3) and ADS8344 on SPI1. They are all capable of high speeds, but we unfortunately used a transeiver TXB0108 which was not responding at higher speeds, though it is supposed to go up to 20 MHz. Since we could not get it working we wanted to reduce the SPI speed. By controlling the pins in software directly, we found that at about 100 KHz the transceiver seemed to be giving some proper output and hence we wanted to bring SPI speed to very low rates.

I need to know two things specifically: (1) What is wrong with the Halcogen program I had attached that it does not download to the device properly? (2) Has my device, which I programmed with 11.45 MHz VCLK1, failed permanently? Is it possible to recover the device, if so, how?

Vaidi.

Forum Post: Can we use CCSV5 on TMS570 MDK?

kevin huang101715 — Wed, 19 Jun 2013 03:04:00 GMT

Hi:

I download the CCSV5 and install it.

It show a license requirement window.

I input the "TMDX570-Development-Kit.lic" that are under CCSV4 directory, but it show invalid lincense.

How can i get a new license for CCSV5?

Forum Post: TM4C1230D5PM Current Consumption

Reagan Revisore — Wed, 19 Jun 2013 02:44:00 GMT

Table 20-36 from the TM4C1230D5PM shows current values to be pending. Do we have any of this material under NDA, or possibly at least on timeline on when these numbers might be published?

http://www.ti.com/lit/ds/symlink/tm4c1230d5pm.pdf

-Reagan

Forum Post: F28235 ADC dual-sequencer timing problem

Kaixin SUN — Wed, 19 Jun 2013 02:36:00 GMT

I am using TMS320F28235 to do ADC tests.

The problem is that the ADC conversion time is different between seq1 and seq2.

Please see the test record below.

Mode	Channel	Conv. Count	ACQ_PS	T(us)
Sequence	1	8	0	2.3
Sequence	1	8	9	5.1
Sequence	8	8	0	0.9
Sequence	8	8	9	0.9
Cascaded	1	8	0	2.4
Cascaded	1	8	9	5.2
Cascaded	8	8	0	2.4
Cascaded	8	8	9	5.2

The time was measured from setting SOC_SEQx to SEQx_BSY cleared.

Other ADC registers were set default values.

CLKIN=HSPCLK=ADCCLK=25MHz.

I think the time for a 8-sampling seq conv is calculated like,

2 + 8 * (1+1) + 2 ADCCLK = 20 * 40ns = 0.8us. (ACQ_PS=0)

2+ 8 * (10+1) + 2 = 85 * 40ns = 3.4us (ACQ_PS=9).

The code is posted in another thread,

http://e2e.ti.com/support/microcontrollers/c2000/f/171/p/272341/952264.aspx#952264

Forum Post: [TM4C] Boot from external Memory

Michael Questo — Wed, 19 Jun 2013 02:35:00 GMT

Tiva Champs,

I've reviewed similar forum posts and it doesn't look like the Tiva can boot entirely from external memory. It looks like the bootloader application was intended for updates opposed to booting from external memory. I may be wrong, Can the TM4C/LM4F's bootloaders be made to load application code from an external flash into internal RAM and run from there or possible use an XIP NOR.

Stellaris Cortex-M4 boot from SPI Flash

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/p/242443/848517.aspx

Boot loader for LM4F series on UART1

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/p/247749/868758.aspx

Stellaris® Boot Loader

http://www.ti.com/lit/ug/spmu134p/spmu134p.pdf

Forum Post: RE: MSP430x5xx memory read/program via JTAG

liwei chen — Wed, 19 Jun 2013 02:19:00 GMT

Thanks for your reply, but actually i'm using standard read function but not quick read.

Still trying... maybe I missed something but currently no idea.

And thanks for your pattern, i'll use that on my test.

Forum Post: RE: Is there a concerto bootROM Api library published?

Edwin69632 — Wed, 19 Jun 2013 02:16:00 GMT

Mark for studying

Forum Post: RE: F28235 ADC Mirror Result Register problem

Kaixin SUN — Wed, 19 Jun 2013 02:14:00 GMT

Thank you Devin.

The code is polling AdcRegs.ADCST.bit.SEQ2_BSY flag, until it is cleared.

I also tried reading AdcMirror.ADCRESULT0 twice and the result was correct.

This problem may involves another ADC timing problem.

I measured the ADC conversion time, dual seq mode, 8 samples on one channel per seq, from setting

AdcRegs.ADCTRL2.bit.SOC_SEQx = 1;

to AdcRegs.ADCST.bit.SEQx_BSY is cleared. (x = 1 or 2).

For seq1(ch=1), this time is around 2.2us,

seq2(ch=8), this time is around 1us.

The problem is that why conversion time is different between seq1 and seq2?

Does this timing difference will cause the mirror results problem.

When I set cascaded mode, both time is 2.3 us.

I opened another thread for this problem,

http://e2e.ti.com/support/microcontrollers/c2000/f/171/t/272649.aspx

Forum Post: RE: Need to change 2 glyphs in FontCmss18

Dave Wilson — Wed, 19 Jun 2013 02:09:00 GMT

Yes, changing the source font would likely be a good way to solve the problem. I assumed that you would not have access to a vector font editor but such tools probably exist.

Forum Post: RE: What is the latest MSP-FET430UIF firmware?

old_cow_yellow — Wed, 19 Jun 2013 02:07:00 GMT

I have the same experience as you did.It appears to me that it is not a matter of what is the latest. They each want to have a certain specific version. If the firmware version does not match that, they tell you to upgrade or update. I think it actually can be a downgrade or downdate. If you switch between two such programs, you may end up going in circles.

Forum Post: RE: __bis_SR_register(LPM3_bits + GIE) in UART demo of msp430f5xx_f6xx lib

bj Wang — Wed, 19 Jun 2013 01:30:00 GMT

Hello Is T da S

Sorry, i misunderstood what you said. Now It is working.

Thank you!

Charles

Forum Post: RE: TMS570LS - SCI Phantom Interrupt

Zhaohong Zhang — Wed, 19 Jun 2013 01:27:00 GMT

Charles,

Normally, the offset register should point to the RX event when RXRDY is set. Would you please double check if you are reading the correct offset register? There are separate ones for level 0 and level 1 interrupts. You need to check the following.

(1) Which interrupt is enabled level 1 or level 0? You can only enable one. You need to check SCI registers and VIM registers.

(2) Check the VIM register to see if the correct flag is set when SCI interrupt occurs. To do this, you need to put a breakpoint at the very beginnin of the ISR,

(3) Check if the correct offset register is read.

I had personal experience in reading wrong offset register.

Thanks and regards,

Zhaohong

Forum Post: RE: LM339N Comparator into MSP430G2231

Joseph Raslavsky — Wed, 19 Jun 2013 00:28:00 GMT

Timothy Barr has found one problem with your design. “On problem with the LM339 is that the inputs need to be 1.5V lower that the supply voltage in order for comparison to work properly. The inputs can be higher than that and not destroy the input pins, but the LM339 can't properly compare voltages higher than (supply voltage -1.5V). So if the supply voltage is 3.3V, then the Vref in your design cannot be higher than 1.8V.”

You say “my Vref right now is 1.65V. And the signal is coming straight from Vcc. So i'm comparing 1.65v reference with a 3.3v signal.”

As you can see from the spec the LM339 is not guaranteed to work properly if either input level is within 1.5 volts of Vcc. So if you apply 3.3v you are violating the spec.

Forum Post: RE: MSP-FET 430UIF Could not set device Vcc

old_cow_yellow — Wed, 19 Jun 2013 00:00:00 GMT

Well, your FET unit needs to be replaced or repaired. This happens and it is not your fault.

Forum Post: RE: How can I achieve maximum ADC sampling rate of 5,77 MSPS with a Concerto F28M35x?

Mandy Foster — Tue, 18 Jun 2013 23:50:00 GMT

Ops I did not updated the code that I have sent. I am terribly sorry about that.

Here is a updated code:

(Please visit the site to view this file)

There two difference from the previous code:

I made the Voltage1 size bigger. It has to be multiple of 16 because the function run_adc_pingpong_v2(Size, Voltage1); takes 16 samples at time. So I set Voltage1 [128].

In the ping_pong.c you will see that run_adc_pingpong_v2(Size, Voltage1); is basically a ping pong sample in a while loop until the "buffer" or Voltage1 is full, then it stops.

The problem is that around sample number 48-ish it gets a jump in the measurement. As you can see in the figure shown in the previous post.

Thank you so much for your assistance

and sorry for the trouble.

Mandy

Forum Post: CC430F5137 with RTC_D interrupt

Daniel Berenguer — Tue, 18 Jun 2013 23:29:00 GMT

I'm trying to use RTC_D as a counter on a CC430F5137 without much success. I'm doing this at this moment:

UCSCTL4 &= ~BIT8; // ACLK = External 32.768 KHz crystal

RTCNT1 = 0; // Reset count
RTCNT2 = 0;
RTCNT3 = 0;
RTCNT4 = 0;

RTCCTL1 = 0x01; // 32-bit counter mode, 16-bit overflow, counter operational, no prescaling

RTCCTL0 |= BIT6; // Enable RTC interrupt

Elsewhere in the mail loop I'm checking the state of the interrupt flag as follows:

if (RTCCTL0 & BIT2)
{
RTCNT1 = 0; // Reset count
RTCNT2 = 0;
RTCNT3 = 0;
RTCNT4 = 0;
RTCCTL0 &= ~BIT2; // Reset interrupt flag
printf("EVENT\n");
}

I thought that the above would give me an "EVENT" being printed every 2 seconds but I'm getting nothing instead. I know that I'm missing some obvious step but my inexperience with MSP430 cores and the lack of examples in the web about the use of the RTC_D timer are not helping at all.

Any suggestion is welcome. Thanks!

Forum Post: Help! - Target error from Commit Flash write

m.bandu — Tue, 18 Jun 2013 23:27:00 GMT

Hi,

I am currently using CodeRed v3.

And we were using our current board with LM3S9B90. Recently we need a bigger flash size. So we try to replace it with LM3S9D96.

Every work fine with LM Flash. I can read, write, verify using LM Flash tool.

But when I build my firmware with CodeRed, I got this "15: Target error from Commit Flash write: Ef(4). Flash write operation failed." error message.

When I look at Code Red website, I only found this article

http://support.code-red-tech.com/CodeRedWiki/CommitFlashWrite

But I'm quite sure its not target power source because everything working well with LM3S9B90 MCU.

We starting to see this issue only when we use LM3S9D96. (its the same board)

I attached the build log file as well. (Please visit the site to view this file)

Please advise me on how should I resolve this issue.

Thank you very much,

BanduPost

Forum Post: RE: DK-LM3S9B96 on Windows 8?

Jason Leung — Tue, 18 Jun 2013 23:20:00 GMT

Hi Vito,

Thanks for the reply, I was poking around and I finally figured it out. The board wasn't being picked up because I was using the OTG/USB connector versus the ICDI connector. Once I realized that things fell together nicely. It turns out the previous user had uploaded the blink demo on. Now I'm just trying to figure out how to use muVision 4 and get the two talking.

Jason