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發(fā)布日期:2022-04-28 點(diǎn)擊率:44
Other Parts Discussed in Post: MMWCAS-DSP-EVM, MMWCAS-RF-EVM, AWR2243
作者:Chris Meng
毫米波用戶(hù)需要通過(guò)測(cè)試連續(xù)波來(lái)確認(rèn)TI毫米波芯片發(fā)射射頻信號(hào)的頻率的準(zhǔn)確性。用戶(hù)對(duì)聯(lián)參考設(shè)計(jì)板上進(jìn)行發(fā)射天線的連續(xù)波測(cè)試有不同的測(cè)試要求。下面介紹三種不同測(cè)試場(chǎng)景的測(cè)試流程。
測(cè)試條件:
硬件平臺(tái): MMWCAS-RF-EVM (revE)/MMWCAS-DSP-EVM
PC軟件: mmwave studio 3.00.00.14
AWR2243 ES1.1的固件補(bǔ)丁: mmwave_dfp_02_02_03_01
頻譜分析儀
測(cè)試場(chǎng)景一
1. 測(cè)試要求:對(duì)級(jí)聯(lián)板上每個(gè)AWR2243所有3根發(fā)射天線同時(shí)發(fā)射連續(xù)波的測(cè)試。
2. 測(cè)試流程:
先在mmwave studio里運(yùn)行下面的腳本進(jìn)行所有4片AWR2243的參數(shù)配置。mmwave_studio_03_00_00_14mmWaveStudioscriptsCascadeCascade_Configuration_ContStream.lua (測(cè)試腳本已經(jīng)包含在mmwave studio里)
然后運(yùn)行下面的腳本。這個(gè)腳本會(huì)先使能芯片Slave 3的連續(xù)波發(fā)射,然后使能Slave2, Slave1,Master芯片。接著停止所有芯片的信號(hào)發(fā)射。最后保存相關(guān)ADC數(shù)據(jù)到SSD硬盤(pán)上,傳送給PC。mmwave_studio_03_00_00_14mmWaveStudioscriptsCascadeCascade_Capture_ContStream.lua(測(cè)試腳本已經(jīng)包含在mmwave studio里)
通過(guò)頻譜儀抓取和觀測(cè)芯片的發(fā)射信號(hào)。
測(cè)試場(chǎng)景二
1. 測(cè)試要求:對(duì)級(jí)聯(lián)板的AWR2243 主芯片(master)的單發(fā)射天線進(jìn)行連續(xù)波的測(cè)試。
2. 測(cè)試流程:
以主芯片的TX0天線為例 (RadarDevice1)
a. 配置主芯片。
在mmwave studio里運(yùn)行下面的腳本:
Cascade_Configuration_ContStream_master_example.lua (具體內(nèi)容見(jiàn)附錄)
運(yùn)行腳本后的mmwave studio界面信息如下:
b. 發(fā)射連續(xù)波。
運(yùn)行下面的腳本:mmwave_studio_03_00_00_14mmWaveStudioscriptsCascadeCascade_Capture_ContStream.lua(測(cè)試腳本已經(jīng)包含在mmwave studio里)
c. 通過(guò)頻譜儀抓取和觀測(cè)芯片的發(fā)射信號(hào)。
測(cè)試場(chǎng)景三
1. 測(cè)試要求:對(duì)級(jí)聯(lián)板的AWR2243 從芯片(slave)的單發(fā)射天線進(jìn)行連續(xù)波的測(cè)試。
2. 測(cè)試流程:
以slave2芯片的TX1天線為例 (RadarDevice3)
a. 配置從芯片。
在mmwave studio里運(yùn)行下面的腳本:Cascade_Configuration_ContStream_slave_example.lua(具體內(nèi)容見(jiàn)附錄)
運(yùn)行腳本后的mmwave studio界面信息如下:
b. 發(fā)射連續(xù)波。
運(yùn)行下面的腳本:mmwave_studio_03_00_00_14mmWaveStudioscriptsCascadeCascade_Capture_ContStream.lua(測(cè)試腳本已經(jīng)包含在mmwave studio里)
c. 通過(guò)頻譜儀抓取和觀測(cè)芯片的發(fā)射信號(hào)。
注意事項(xiàng):
如果改變了AWR2243的ChanNAdcConfig_mult 參數(shù)(相對(duì)于上一次配置),用戶(hù)必須對(duì)板子進(jìn)行斷電,再上電的操作。
常見(jiàn)問(wèn)題:
1. 問(wèn)題:如何使能、不使能主芯片或者是從芯片里的不同發(fā)射天線TX?
答案::用戶(hù)需要修改配置參數(shù)的LUA腳本里ar1.ChanNAdcConfig_mult 函數(shù)的Tx0En/Tx1En/Tx2En 參數(shù)。關(guān)于這個(gè)函數(shù)的更多信息見(jiàn)下。對(duì)于Tx0En/Tx1En/Tx2En, 1表示使能,0表示不使能。
Int32 ar1.ChanNAdcConfig_mult(UInt16 RadarDeviceId, UInt16 Tx0En, UInt16 Tx1En, UInt16 Tx2En, UInt16 Rx0En, UInt16 Rx1En, UInt16 Rx2En, UInt32 Rx3En, Int32 BitsVal, UInt32 FmtVal, UInt32 IQSwap, UInt16 CasCadeMode) - Static device config API which defines configure both the Transmiter and Reciever channels of Radar device and also ADC data format output
_I_ UInt16 RadarDeviceId - Radar Device Id
_I_ UInt16 Tx0En - Tx0 channel
_I_ UInt16 Tx1En - Tx1 channel
_I_ UInt16 Tx2En - Tx2 channel
_I_ UInt16 Rx0En - Rx0 channel
_I_ UInt16 Rx1En - Rx1 channnel
_I_ UInt16 Rx2En - Rx2 channel
_I_ UInt32 Rx3En - Rx3 channel[b15:0] + (CascadePinOutCfg[b31:16] b16:ClkOutMasterDis, b17:SynOutMasterDis, b18:ClkOutSlaveEna, b19:SynOutSlaveEna, b20:IntLOMasterEna, b21:OSCClkOutMasterDis, b22:INTFRCMasterEna)
_I_ Int32 BitsVal - Number of ADC bits
_I_ UInt32 FmtVal - ADC output format[b15:0] + FullScaleReductionFactor[b31:16]
_I_ UInt32 IQSwap - ADC Mode
_I_ UInt16 CasCadeMode - CascadeMode(Single Chip: 0x0000, MultiChip Master:0x0001, MultiChip Slave:0x0002)
2. 問(wèn)題:如何使能或者關(guān)閉級(jí)聯(lián)板上不同的從芯片?
答案:用戶(hù)需要修改配置參數(shù)的LUA里RadarDevice的設(shè)置。RadarDevice里dev1是主芯片,dev2、dev3、dev4是從芯片。
例如: RadarDevice = {1, 0, 1, 0} -- {dev1, dev2, dev3, dev4}, 1: Enable, 0: Disable
3. 問(wèn)題:如何改變連續(xù)波的頻率?
答案:用戶(hù)需要修改配置參數(shù)的LUA里ar1.ContStrConfig_mult函數(shù)的startFreqConst參數(shù)值。
Int32 ar1.ContStrConfig_mult(UInt16 RadarDeviceId, Double startFreqConst, UInt16 digOutSampleRate, Char rxGain, Char hpfCornerFreq1, Char hpfCornerFreq2, UInt32 tx0OutPowerBackoffCode, UInt32 tx1OutPowerBackoffCode, UInt32 tx2OutPowerBackoffCode, UInt16 tx0PhaseShifter, UInt16 tx1PhaseShifter, UInt32 tx2PhaseShifter) - Continuous Streming Configuration API defines Configuration of the data path to transfer the captured ADC samples continuously without missing any sample to external Device(host)
_I_ UInt16 RadarDeviceId - Radar Device Id
_I_ Double startFreqConst - Start Frequency for each profile of chirp in GHz
_I_ UInt16 digOutSampleRate - ADC sampling rate for each profile in ksps
_I_ Char rxGain - Rx gain for each profile in dB
_I_ Char hpfCornerFreq1 - HPF1 corner frequency for each profile in KHz
_I_ Char hpfCornerFreq2 - HPF2 corner frequency for each profile in KHz
_I_ UInt32 tx0OutPowerBackoffCode - How much the trasmit power should be reduced from Max in Tx0 Channel
_I_ UInt32 tx1OutPowerBackoffCode - How much the trasmit power should be reduced from Max in Tx1 Channel
_I_ UInt32 tx2OutPowerBackoffCode - How much the trasmit power should be reduced from Max in Tx2 Channel
_I_ UInt16 tx0PhaseShifter - The additional phase shift to be introduced on Tx0 Channel
_I_ UInt16 tx1PhaseShifter - The additional phase shift to be introduced on Tx1 Channel
_I_ UInt32 tx2PhaseShifter - The additional phase shift to be introduced on Tx2 Channel(b0:15) + ForceSelect(b16) + VCOSelecct(b17))
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