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MSP430FR5043: about the stop pulses with Multi Tone Generation

先生 朱
Prodigy 10 points
Part Number: MSP430FR5043

Tool/software:

《MSP430FR58xx, MSP430FR59xx, and MSP430FR6xx Family User's Guide》21.2.5 Multi Tone Generation described：

Finally setting SAPH_AXPGCTL.XMOD = 2 to terminates the multi tone. The last regular excitation pulses
are followed by stop pulses. Then PPG_A goes to Pause phase again (see Figure 21-10 and Figure 21-9).
The stop pulses have a 180° phase shift compared to the last regular excitation pulses. The stop pulses
have same frequency as the last regular excitation pulses。

to my understanding，stop pulses has two important attributes:180° phase shift and same frequency, compared to the last regular excitation pulses 。
This also conforms to the accompanying diagram in the document：

（Figure 21-11. PPG_A Multi Tone Generation With SAPHPGC.PPOL = 1(Starts With Low Polarity)）

However, in the example routines provided on the official website, the frequency of the "stop pulses" section is pre-defined. This configuration refers to the following preset settings, which do not conform to the documentation instructions：

const USS_App_AddlTXSequence_t addtlTXSeqs[USS_APP_ADDTL_TX_SEQUENCES_MAX] =
{
// Sequence # 1
// 2 trill pulses
// X-Pulse #1 = 1 @300kHz (with 80Mhz PLL)
// E-Pulse #1 = 1 @400kHz (with 80Mhz PLL)
// X-Pulse #2 = 2 @500kHz (with 80Mhz PLL)
// E-Pulse #2 = 2 @500kHz (with 80Mhz PLL)
{
.numTrillCycles = 2,
.xpulse = {1,2},
.xhper = {133,80},
.xlper = {133,80},
.epulse = {1,2},
.ehper = {100,80},
.elper = {100,80},
.binPatternLen = 14,
.binPattern = {1,1,-1,-1,1,-1,1,-1,1,-1,1,-1,1,-1}
},
// Sequence # 2
// 2 trill pulses
// X-Pulse #1 = 1 @300kHz (with 80Mhz PLL)
// E-Pulse #1 = 1 @400kHz (with 80Mhz PLL)
// X-Pulse #2 = 2 @500kHz (with 80Mhz PLL)
// E-Pulse #2 = 2 @800kHz (with 80Mhz PLL)
{
.numTrillCycles = 2,
.xpulse = {1,2},
.xhper = {133,80},
.xlper = {133,80},
.epulse = {1,2},
.ehper = {100,50},
.elper = {100,50},
.binPatternLen = 25,
.binPattern = {1,1,1,1,-1,-1,-1,1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,-1,-1,1,-1}
}
};

I would like to confirm whether the code in this part needs to be adjusted by the manufacturer based on the actual working frequency of the product?

  • 0
    Prodigy 10 points

    I misunderstood, 

    const USS_App_AddlTXSequence_t addtlTXSeqs[USS_APP_ADDTL_TX_SEQUENCES_MAX] 

    is used for test tone。

    so how to turn off  the test tone in automatic mode?

    and how to turn on the stop pluses  in automatic mode?

  • 0 in reply to 先生 朱
    TI__Mastermind 19317 points

    Let me loop the USS expert to provide comments.

  • 0 in reply to Helic Chi
    Prodigy 10 points

    I am currently conducting tests based on the sample code downloaded from the official website.
    I hope to receive assistance and be guided on how to make modifications to the routine code to achieve my goal.
    thanks.

  • 0 in reply to 先生 朱
    TI__Mastermind 46625 points

    Hi,

    What is your goal here. I am unclear about what you want to do?

    Best regards,

    Cash Hao

  • 0 in reply to Cash Hao11
    Prodigy 10 points

    I use msp430fr5043 for gas meter. I followed the instructions of the document "Software changes required for MSP430FR5043.pdf " and it worded.

    but during the measurement process, I observed that the DTOF window sometimes undergoes sudden changes,like this:

    It often occurs during periods of big flow.

    I need to find out the cause of this phenomenon and then solve it.

    I have two ideas of my own:

    one is the flow channel causes sound wave reflection, and the other is the ultrasound excitation pulse.

    Regarding the first reason, I will improve the flow channel and then conduct further observation.

    then,about the ultrasound excitation pulse, my ultrasonic transducer operates at a frequency of 500 KHz.

    I use the follow setting:

    the ADC Capture like this at 0 flow:

    and this at 6m3/h flow:

    .

    I observed the excitation signal through the oscilloscope as follows:

    except 8 x-pulse and e-pulse, There are an additional 6 pulsesn, and no s-pulse.

    I think this additional pulse might be the cause.

    I found the definitions of these 6 pulses in the code:

    const USS_App_AddlTXSequence_t addtlTXSeqs[USS_APP_ADDTL_TX_SEQUENCES_MAX] =
    {
    // Sequence # 1
    // 2 trill pulses
    // X-Pulse #1 = 1 @300kHz (with 80Mhz PLL)
    // E-Pulse #1 = 1 @400kHz (with 80Mhz PLL)
    // X-Pulse #2 = 2 @500kHz (with 80Mhz PLL)
    // E-Pulse #2 = 2 @500kHz (with 80Mhz PLL)
    {
    .numTrillCycles = 2,
    .xpulse = {1,2},
    .xhper = {133,80},
    .xlper = {133,80},
    .epulse = {1,2},
    .ehper = {100,80},
    .elper = {100,80},
    .binPatternLen = 14,
    .binPattern = {1,1,-1,-1,1,-1,1,-1,1,-1,1,-1,1,-1}
    },
    // Sequence # 2
    // 2 trill pulses
    // X-Pulse #1 = 1 @300kHz (with 80Mhz PLL)
    // E-Pulse #1 = 1 @400kHz (with 80Mhz PLL)
    // X-Pulse #2 = 2 @500kHz (with 80Mhz PLL)
    // E-Pulse #2 = 2 @800kHz (with 80Mhz PLL)
    {
    .numTrillCycles = 2,
    .xpulse = {1,2},
    .xhper = {133,80},
    .xlper = {133,80},
    .epulse = {1,2},
    .ehper = {100,50},
    .elper = {100,50},
    .binPatternLen = 25,
    .binPattern = {1,1,1,1,-1,-1,-1,1,1,1,-1,-1,1,1,-1,-1,1,1,-1,-1,1,-1,-1,1,-1}
    }
    };

    My question is:

    1、Your explanation for the cause of this mutation phenomenon；

    2、what is the  additional 6 pulses，is Test Tone Generation described in the chapter 21.2.8 of "MSP430FR6xx Family User's Guide "?

    and how do I turn this off additional pulses in the code?

    3、I want to test the effect of the stop pulse，how do i turn on it in the code in the auto mode？

  • 0 in reply to 先生 朱
    Prodigy 10 points

    Supplementary configuration diagram:

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