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stroke-width: 1.0;" width="10" x="561.5" y="583.9609"/><rect fill="#FFFFFF" filter="url(#f161eqf8p7fyeb)" height="182.6641" style="stroke: #A80036; stroke-width: 1.0;" width="10" x="556.5" y="795.625"/><polygon fill="#A80036" points="230.5,85.4297,240.5,89.4297,230.5,93.4297,234.5,89.4297" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="162.5" x2="236.5" y1="89.4297" y2="89.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="51" x="169.5" y="84.4966">Invoke()</text><polygon fill="#A80036" points="341.5,114.5625,351.5,118.5625,341.5,122.5625,345.5,118.5625" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="252.5" x2="347.5" y1="118.5625" y2="118.5625"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="36" x="259.5" y="113.6294">Eval()</text><polygon fill="#A80036" points="544.5,143.6953,554.5,147.6953,544.5,151.6953,548.5,147.6953" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="363.5" x2="550.5" y1="147.6953" y2="147.6953"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="152" x="370.5" y="142.7622">ethosu_reserve_driver()</text><rect fill="none" height="312.8672" style="stroke: #000000; stroke-width: 2.0;" width="734.5" x="64" y="162.8281"/><polygon fill="#EEEEEE" points="64,162.8281,141,162.8281,141,169.8281,131,179.8281,64,179.8281,64,162.8281" style="stroke: #000000; stroke-width: 2.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="32" x="79" y="175.895">loop</text><text fill="#000000" font-family="sans-serif" font-size="11" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="159" x="156" y="175.0386">[Find and reserve driver]</text><polygon fill="#A80036" points="178.5,196.9609,168.5,200.9609,178.5,204.9609,174.5,200.9609" style="stroke: #A80036; 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stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="172.5" x2="555.5" y1="286.2266" y2="286.2266"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="150" x="184.5" y="281.2935">ethosu_mutex_unlock()</text><polygon fill="#A80036" points="544.5,296.3594,554.5,300.3594,544.5,304.3594,548.5,300.3594" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="162.5" x2="550.5" y1="300.3594" y2="300.3594"/><rect fill="none" height="153.3359" style="stroke: #000000; stroke-width: 2.0;" width="565" x="74" y="315.3594"/><polygon fill="#EEEEEE" points="74,315.3594,138,315.3594,138,322.3594,128,332.3594,74,332.3594,74,315.3594" style="stroke: #000000; stroke-width: 2.0;"/><text fill="#000000" font-family="sans-serif" font-size="13" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="19" x="89" y="328.4263">alt</text><text fill="#000000" font-family="sans-serif" font-size="11" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="121" x="153" y="327.5698">[Found free driver]</text><polygon fill="#FBFB77" filter="url(#f161eqf8p7fyeb)" points="493,337.4922,493,362.4922,625,362.4922,625,347.4922,615,337.4922,493,337.4922" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="615" x2="615" y1="337.4922" y2="347.4922"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="625" x2="615" y1="347.4922" y2="347.4922"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="111" x="499" y="354.5591">Return free driver</text><line style="stroke: #000000; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="74" x2="639" y1="372.625" y2="372.625"/><text fill="#000000" font-family="sans-serif" font-size="11" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="131" x="79" y="382.8354">[No driver available]</text><polygon fill="#A80036" points="178.5,403.4297,168.5,407.4297,178.5,411.4297,174.5,407.4297" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="172.5" x2="555.5" y1="407.4297" y2="407.4297"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="169" x="184.5" y="402.4966">ethosu_semaphore_take()</text><polygon fill="#FBFB77" filter="url(#f161eqf8p7fyeb)" points="84,420.5625,84,445.5625,236,445.5625,236,430.5625,226,420.5625,84,420.5625" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="226" x2="226" y1="420.5625" y2="430.5625"/><line style="stroke: #A80036; stroke-width: 1.0;" x1="236" x2="226" y1="430.5625" y2="430.5625"/><text fill="#000000" font-family="sans-serif" font-size="13" lengthAdjust="spacingAndGlyphs" textLength="131" x="90" y="437.6294">Block on semaphore</text><polygon fill="#A80036" points="544.5,456.6953,554.5,460.6953,544.5,464.6953,548.5,460.6953" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="162.5" x2="550.5" y1="460.6953" y2="460.6953"/><polygon fill="#A80036" points="374.5,484.6953,364.5,488.6953,374.5,492.6953,370.5,488.6953" style="stroke: #A80036; stroke-width: 1.0;"/><line style="stroke: #A80036; stroke-width: 1.0; stroke-dasharray: 2.0,2.0;" x1="368.5" x2="560.5" y1="488.6953" y2="488.6953"/><polygon fill="#A80036" points="544.5,513.6953,554.5,517.6953,544.5,521.6953,548.5,517.6953" style="stroke: #A80036; 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+
+skinparam backgroundColor #EEEBDC
+
+box "Application" #00C1DE
+participant "main()" as app
+end box
+
+box "Tensorflow" #FF6B00
+participant "TFLu" as tflu
+participant "Ethos-U custom op" as custom
+end box
+
+box "Ethos-U driver" #95D600
+participant "Driver" as driver
+end box
+
+box "Hardware" #FFC700
+participant "Cortex-M" as cortexm
+participant "Ethos-U" as ethosu
+end box
+
+app -> tflu++: Invoke()
+ tflu -> custom++: Eval()
+ custom -> driver++: ethosu_reserve_driver()
+ loop Find and reserve driver
+ driver -> app++: ethosu_mutex_lock()
+ return
+
+ driver -> driver: ethosu_find_and_reserve_driver()
+
+ driver -> app++: ethosu_mutex_unlock()
+ return
+
+ alt Found free driver
+ note over driver
+ Return free driver
+ end note
+ else No driver available
+ driver -> app++: ethosu_semaphore_take()
+ note over app
+ Block on semaphore
+ end note
+ return
+ end
+ end loop
+ return
+
+ custom -> driver++: ethosu_invoke()
+ driver -\\ ethosu: Configure NPU and trigger inference
+
+ driver -> driver++: wait_for_irq()
+ note over driver
+ Driver sleeping waiting for IRQ
+ end note
+
+ ethosu -\\ cortexm: IRQ
+ cortexm -\\ driver: ethosu_irq_handler()
+
+ note over driver
+ Driver woken up by IRQ handler
+ end note
+ return
+ return
+
+ custom -> driver++: ethosu_release_driver()
+ driver -> app++: ethosu_mutex_lock()
+ return
+
+ driver -> app++: ethosu_semaphore_give()
+ note over app
+ Wake up threads blocking on the semaphore
+ end note
+ return
+
+ driver -> app++: ethosu_mutex_unlock()
+ return
+ return
+ return
+return
+
+@enduml
+ +PlantUML version 1.2017.15(Mon Jul 03 18:45:34 CEST 2017) +(GPL source distribution) +Java Runtime: OpenJDK Runtime Environment +JVM: OpenJDK 64-Bit Server VM +Java Version: 11.0.10+9-Ubuntu-0ubuntu1.18.04 +Operating System: Linux +OS Version: 5.4.0-70-generic +Default Encoding: UTF-8 +Language: en +Country: US +--></g></svg>
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