SPIS of nrf52 could not read the data accuracy

[hzhuxin]

I am working with SPIS example ( sdk version 15.3). SPI master send data regulaly. For example, it sent 5ms cs low, but there are only two bytes transferred, the first byte at begin of 5ms, other one at the end. SPIS of nrf52 not read the second one, what can I do with it?

[Edvin]

Hello,

From your main.c file, you have:

APP_ERROR_CHECK(nrf_drv_spis_buffers_set(&spis, m_tx_buf, 0, m_rx_buf, 1));

Try to increase the length of the receive buffer, which you currently have set to 1.

Can you try:

APP_ERROR_CHECK(nrf_drv_spis_buffer_set(&spis, m_tx_buf, 2, m_rx_buf, 2));

[hzhuxin]

I had tried from 2 to 20, the same result.

[hzhuxin]

Fullscreen 2019-10-15_17-32-09.txt Download

Time[s], CS, MOSI, CLK
0.000000000, 1, 0, 0
0.035279500, 0, 0, 0
0.035283320, 0, 0, 1
0.035299280, 0, 1, 1
0.035315260, 0, 0, 1
0.035315280, 0, 0, 0
0.035331240, 0, 1, 0
0.035347220, 0, 0, 0
0.035363200, 0, 1, 0
0.035379160, 0, 0, 0
0.035395140, 0, 1, 0
0.035411140, 0, 0, 0
0.035427100, 0, 1, 0
0.035443080, 0, 0, 0
0.035459060, 0, 1, 0
0.035475040, 0, 0, 0
0.035491020, 0, 1, 0
0.035507000, 0, 0, 0
0.035522980, 0, 1, 0
0.035538960, 0, 0, 0
0.039152900, 1, 0, 0
0.039156380, 0, 0, 0
0.039198400, 0, 1, 0
0.039214380, 0, 0, 0
0.039230360, 0, 1, 0
0.039246340, 0, 0, 0
0.039246360, 0, 0, 1
0.039262320, 0, 1, 1
0.039278300, 0, 0, 1
0.039278320, 0, 0, 0
0.039294280, 0, 1, 0
0.039310260, 0, 0, 0
0.039326240, 0, 1, 0
0.039342200, 0, 0, 0
0.039358200, 0, 1, 0
0.039374180, 0, 0, 0
0.039390160, 0, 1, 0
0.039406140, 0, 0, 0
0.039422120, 0, 1, 0
0.039438100, 0, 0, 0
0.039553360, 1, 0, 0
0.039587580, 0, 0, 0
0.039613860, 0, 1, 0
0.039629840, 0, 0, 0
0.039645820, 0, 1, 0
0.039661800, 0, 0, 0
0.039661820, 0, 0, 1
0.039677780, 0, 1, 1
0.039693760, 0, 0, 1
0.039709740, 0, 1, 1
0.039725720, 0, 0, 0
0.039741680, 0, 1, 0
0.039757660, 0, 0, 0
0.039773660, 0, 1, 0
0.039789640, 0, 0, 0
0.039805620, 0, 1, 0
0.039821600, 0, 0, 0
0.039837580, 0, 1, 0
0.039853560, 0, 0, 0
0.040044480, 1, 0, 0
0.040078680, 0, 0, 0
0.040125180, 0, 1, 0
0.040141160, 0, 0, 0
0.040157140, 0, 1, 0
0.040173120, 0, 0, 1
0.040189100, 0, 1, 1
0.040205080, 0, 0, 0
0.040221060, 0, 1, 0
0.040237040, 0, 0, 1
0.040253020, 0, 1, 1
0.040268980, 0, 0, 1
0.040284960, 0, 1, 1
0.040300940, 0, 0, 1
0.040316920, 0, 1, 1
0.040332900, 0, 0, 0
0.040348880, 0, 1, 0
0.040364840, 0, 0, 0
0.040535520, 1, 0, 0
0.040569720, 0, 0, 0
0.040604500, 0, 1, 0
0.040620480, 0, 0, 0
0.040636460, 0, 1, 0
0.040652440, 0, 0, 0
0.040652460, 0, 0, 1
0.040668420, 0, 1, 1
0.040684400, 0, 0, 1
0.040700380, 0, 1, 1
0.040716360, 0, 0, 0
0.040732320, 0, 1, 0
0.040748300, 0, 0, 0
0.040764280, 0, 1, 0
0.040780260, 0, 0, 0
0.040796260, 0, 1, 0
0.040812240, 0, 0, 0
0.040828220, 0, 1, 0
0.040844200, 0, 0, 0
0.041026620, 1, 0, 0
0.041060820, 0, 0, 0
0.041083860, 0, 1, 0
0.041099820, 0, 0, 0
0.041115800, 0, 1, 0
0.041131760, 0, 0, 0
0.041131780, 0, 0, 1
0.041147740, 0, 1, 1
0.041163720, 0, 0, 1
0.041163740, 0, 0, 0
0.041179700, 0, 1, 0
0.041195680, 0, 0, 0
0.041211660, 0, 1, 0
0.041227620, 0, 0, 0
0.041243600, 0, 1, 0
0.041259580, 0, 0, 0
0.041275560, 0, 1, 0
0.041291540, 0, 0, 0
0.041307520, 0, 1, 0
0.041323480, 0, 0, 0
0.041517600, 1, 0, 0
0.041551780, 0, 0, 0
0.041595020, 0, 1, 0
0.041611000, 0, 0, 0
0.041611020, 0, 0, 1
0.041626980, 0, 1, 1
0.041642940, 0, 0, 1
0.041658920, 0, 1, 1
0.041674900, 0, 0, 0
0.041690860, 0, 1, 0
0.041706840, 0, 0, 1
0.041722800, 0, 1, 1
0.041738780, 0, 0, 1
0.041754760, 0, 1, 1
0.041770740, 0, 0, 0
0.041786700, 0, 1, 0
0.041802680, 0, 0, 0
0.041802700, 0, 0, 1
0.041818660, 0, 1, 1
0.041834640, 0, 0, 1
0.042009760, 1, 0, 1
0.042043940, 0, 0, 1
0.042058240, 0, 0, 0
0.042074200, 0, 1, 0
0.042090180, 0, 0, 1
0.042106140, 0, 1, 1
0.042122100, 0, 0, 1
0.042138080, 0, 1, 1
0.042154060, 0, 0, 0
0.042170020, 0, 1, 0
0.042186000, 0, 0, 0
0.042186020, 0, 0, 1
0.042201980, 0, 1, 1
0.042217960, 0, 0, 1
0.042233920, 0, 1, 1
0.042249900, 0, 0, 1
0.042249920, 0, 0, 0
0.042265880, 0, 1, 0
0.042281860, 0, 0, 1
0.042297820, 0, 1, 1
0.042313780, 0, 0, 1
0.042500640, 1, 0, 1
0.042534820, 0, 0, 1
0.042569340, 0, 0, 0
0.042585320, 0, 1, 0
0.042601300, 0, 0, 0
0.042617280, 0, 1, 0
0.042633240, 0, 0, 0
0.042649220, 0, 1, 0
0.042665200, 0, 0, 0
0.042681160, 0, 1, 0
0.042697140, 0, 0, 0
0.042713100, 0, 1, 0
0.042729080, 0, 0, 1
0.042745060, 0, 1, 1
0.042761040, 0, 0, 0
0.042777020, 0, 1, 0
0.042793000, 0, 0, 0
0.042808960, 0, 1, 0
0.042824940, 0, 0, 0
0.042991600, 1, 0, 0
0.043025800, 0, 0, 0
0.043064560, 0, 1, 0
0.043080540, 0, 0, 0
0.043096500, 0, 1, 0
0.043112460, 0, 0, 0
0.043112480, 0, 0, 1
0.043128440, 0, 1, 1
0.043144420, 0, 0, 0
0.043160400, 0, 1, 0
0.043176360, 0, 0, 0
0.043192340, 0, 1, 0
0.043208320, 0, 0, 0
0.043224300, 0, 1, 0
0.043240280, 0, 0, 0
0.043256260, 0, 1, 0
0.043272220, 0, 0, 0
0.043288200, 0, 1, 0
0.043304180, 0, 0, 0
0.043482600, 1, 0, 0
0.043516800, 0, 0, 0
0.043543840, 0, 1, 0
0.043559820, 0, 0, 0
0.043575800, 0, 1, 0
0.043591780, 0, 0, 0
0.043591800, 0, 0, 1
0.043607760, 0, 1, 1
0.043623740, 0, 0, 1
0.043623760, 0, 0, 0
0.043639720, 0, 1, 0
0.043655700, 0, 0, 0
0.043671680, 0, 1, 0
0.043687660, 0, 0, 0
0.043703640, 0, 1, 0
0.043719620, 0, 0, 0
0.043735600, 0, 1, 0
0.043751580, 0, 0, 0
0.043767560, 0, 1, 0
0.043783540, 0, 0, 0
0.043973720, 1, 0, 0
0.044007920, 0, 0, 0
0.044055160, 0, 1, 0
0.044071140, 0, 0, 0
0.044087120, 0, 1, 0
0.044103080, 0, 0, 0
0.044103100, 0, 0, 1
0.044119060, 0, 1, 1
0.044135040, 0, 0, 0
0.044151020, 0, 1, 0
0.044167000, 0, 0, 0
0.044182980, 0, 1, 0
0.044198960, 0, 0, 0
0.044214940, 0, 1, 0
0.044230920, 0, 0, 0
0.044246900, 0, 1, 0
0.044262860, 0, 0, 0
0.044278840, 0, 1, 0
0.044294800, 0, 0, 0
0.044466240, 1, 0, 0
0.044500440, 0, 0, 0
0.044534460, 0, 1, 0
0.044550440, 0, 0, 0
0.044566420, 0, 1, 0
0.044582400, 0, 0, 0
0.044598380, 0, 1, 0
0.044614360, 0, 0, 0
0.044630340, 0, 1, 0
0.044646300, 0, 0, 0
0.044662300, 0, 1, 0
0.044678280, 0, 0, 0
0.044694240, 0, 1, 0
0.044710220, 0, 0, 0
0.044726200, 0, 1, 0
0.044742180, 0, 0, 0
0.044758160, 0, 1, 0
0.044774140, 0, 0, 0
0.044783560, 0, 0, 1
0.044957320, 1, 0, 1
0.044991520, 0, 0, 1
0.044997900, 0, 0, 0
0.044997920, 0, 0, 1
0.044997940, 0, 0, 0
0.045013800, 0, 1, 0
0.045029780, 0, 0, 0
0.045045760, 0, 1, 0
0.045061740, 0, 0, 0
0.045062100, 0, 0, 1
0.045077700, 0, 1, 1
0.045093680, 0, 0, 0
0.045094040, 0, 0, 1
0.045109660, 0, 1, 1
0.045125640, 0, 0, 0
0.045141620, 0, 1, 0
0.045157600, 0, 0, 0
0.045173580, 0, 1, 0
0.045189540, 0, 0, 0
0.045205520, 0, 1, 0
0.045221520, 0, 0, 1
0.045237480, 0, 1, 1
0.045253460, 0, 0, 0
0.045253820, 0, 0, 1
0.045448700, 1, 0, 1
0.045482920, 0, 0, 1
0.045509200, 0, 0, 0
0.045525180, 0, 1, 0
0.045541160, 0, 0, 0
0.045557140, 0, 1, 0
0.045573120, 0, 0, 0
0.045573140, 0, 0, 1
0.045589120, 0, 1, 1
0.045605100, 0, 0, 0
0.045621080, 0, 1, 0
0.045637060, 0, 0, 0
0.045653040, 0, 1, 0
0.045669020, 0, 0, 1
0.045684980, 0, 1, 1
0.045700960, 0, 0, 1
0.045716940, 0, 1, 1
0.045732920, 0, 0, 1
0.045732940, 0, 0, 0
0.045748920, 0, 1, 0
0.045764900, 0, 0, 0
0.045940100, 1, 0, 0
0.045974300, 0, 0, 0
0.046004600, 0, 1, 0
0.046020580, 0, 0, 0
0.046036560, 0, 1, 0
0.046052540, 0, 0, 0
0.046053260, 0, 0, 1
0.046068520, 0, 1, 1
0.046084480, 0, 0, 0
0.046084760, 0, 0, 1
0.046100460, 0, 1, 1
0.046116440, 0, 0, 0
0.046132420, 0, 1, 0
0.046148400, 0, 0, 0
0.046164380, 0, 1, 0
0.046180360, 0, 0, 0
0.046180740, 0, 0, 1
0.046196340, 0, 1, 1
0.046212320, 0, 0, 1
0.046228300, 0, 1, 1
0.046244280, 0, 0, 1
0.046431480, 1, 0, 1
0.046465680, 0, 0, 1
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2019-10-15_17-32-50.csv

Hope the detail information could help you to solve the problem.

[hzhuxin]

By the way how can i enable the HCLK?

Is the priority could cause the the problem?

[Edvin]

Hello,

I am sorry that I didn't specify this, but can you send the .logicdata file? It is not possible to open CSV files in the logic analyzer application. 

You can use nrf_drv_clock_hfclk_request() to start the HF_CLK.

Best regards,

Edvin

[hzhuxin]

2019-10-15_17-33-26.kvdat.bin

You can use the software download from http://www.qdkingst.com/en/download  , and import the dat which i post!

Because file extension couldn't be allow by the up-loader, so please remove the .bin before you import the file. 

I will try to start the HF_CLK, thanks.

Best regards,

xin

[Turbo J]

The 300ns minimum is very optimistic considering that a peripherial interrupt can take up to 4µs latency hit according to the S140_SDS_v1.2, and that is when the softdevice is not busy with radio. This spec considers ONLY the SPIS peripherial and no data handling in the µC core.

SPIS latency is: interrupt enter+ aquire semaphore + change EasyDMA pointers + release semaphore.

I don't think this is doable at all in 3-4 µs. You need to redesign the SPI communication at the SPI master.

[hzhuxin]

Could you tell me about the minimum time interval of between CS raise and fall？

[Edvin]

I only have the number from this table:

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fspis.html&cp=3_2_0_31_5_1&anchor=unique_954891395

T_(SPIS,CWH): Min 300ns. See Figure 3, SPIS Timing Diagram.

One possible issue is that the nRF tries to spin up the HFXTAL on this trigger, which may take more time. This is why I asked you to try to start the HFCLK manually so that it is kept running.