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STM32F411 IRQs for USB device attachment and detachment both fire in host mode

Eqqman
Associate III

Using a Nucleo-F411RE board modified to have 8MHz HSE crystal oscillator and running the OTG peripheral in forced host mode, we are working on implementing our own host stack.  With the current code no IRQs trigger until a device is physically attached to the port.  However, when we plug up a device then the DISCINT bit in GINTSTS is set along with PCSTS and PCDET in FS_HPRT.  Since the host port IRQ is unmasked in FS_GINTMSK the code correctly branches to the global USB ISR, but we are curious as to why the DISCINT (device disconnect) but would also be tripped.  We have verified that this bit is not prematurely firing before we physically plug in the USB device.  The register setup after our USB hardware configuration is as follows:

OTG_FS_HOST                                                   
    FS_HCFG                       0x00000200    0x50000400    
        FSLSPCS                   0x0           [1:0]         
        FSLSS                     0             [2:2]         
    HFIR                          0x0000ea60    0x50000404    
        FRIVL                     0xea60        [15:0]        
    FS_HFNUM                      0xea603fff    0x50000408    
        FRNUM                     0x3fff        [15:0]        
        FTREM                     0xea60        [31:16]       
    FS_HPTXSTS                    0x00080200    0x50000410    
        PTXFSAVL                  0x0200        [15:0]        
        PTXQSAV                   0x08          [23:16]       
        PTXQTOP                   0x00          [31:24]       
    HAINT                         0x00000000    0x50000414    
        HAINT                     0x0000        [15:0]        
    HAINTMSK                      0x00000000    0x50000418    
        HAINTM                    0x0000        [15:0]        
    FS_HPRT                       0x00041803    0x50000440    
        PCSTS                     1             [0:0]         
        PCDET                     1             [1:1]         
        PENA                      0             [2:2]         
        PENCHNG                   0             [3:3]         
        POCA                      0             [4:4]         
        POCCHNG                   0             [5:5]         
        PRES                      0             [6:6]         
        PSUSP                     0             [7:7]         
        PRST                      0             [8:8]         
        PLSTS                     0x2           [11:10]       
        PPWR                      1             [12:12]       
        PTCTL                     0x0           [16:13]       
        PSPD                      0x2           [18:17]       
    FS_HCCHAR0                    0x00000000    0x50000500    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR1                    0x00000000    0x50000520    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR2                    0x00000000    0x50000540    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR3                    0x00000000    0x50000560    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR4                    0x00000000    0x50000580    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR5                    0x00000000    0x500005a0    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR6                    0x00000000    0x500005c0    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCCHAR7                    0x00000000    0x500005e0    
        MPSIZ                     0x000         [10:0]        
        EPNUM                     0x0           [14:11]       
        EPDIR                     0             [15:15]       
        LSDEV                     0             [17:17]       
        EPTYP                     0x0           [19:18]       
        MCNT                      0x0           [21:20]       
        DAD                       0x00          [28:22]       
        ODDFRM                    0             [29:29]       
        CHDIS                     0             [30:30]       
        CHENA                     0             [31:31]       
    FS_HCINT0                     0x00000000    0x50000508    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT1                     0x00000000    0x50000528    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT2                     0x00000000    0x50000548    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT3                     0x00000000    0x50000568    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT4                     0x00000000    0x50000588    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT5                     0x00000000    0x500005a8    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT6                     0x00000000    0x500005c8    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINT7                     0x00000000    0x500005e8    
        XFRC                      0             [0:0]         
        CHH                       0             [1:1]         
        STALL                     0             [3:3]         
        NAK                       0             [4:4]         
        ACK                       0             [5:5]         
        TXERR                     0             [7:7]         
        BBERR                     0             [8:8]         
        FRMOR                     0             [9:9]         
        DTERR                     0             [10:10]       
    FS_HCINTMSK0                  0x00000000    0x5000050c    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK1                  0x00000000    0x5000052c    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK2                  0x00000000    0x5000054c    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK3                  0x00000000    0x5000056c    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK4                  0x00000000    0x5000058c    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK5                  0x00000000    0x500005ac    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK6                  0x00000000    0x500005cc    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCINTMSK7                  0x00000000    0x500005ec    
        XFRCM                     0             [0:0]         
        CHHM                      0             [1:1]         
        STALLM                    0             [3:3]         
        NAKM                      0             [4:4]         
        ACKM                      0             [5:5]         
        NYET                      0             [6:6]         
        TXERRM                    0             [7:7]         
        BBERRM                    0             [8:8]         
        FRMORM                    0             [9:9]         
        DTERRM                    0             [10:10]       
    FS_HCTSIZ0                    0x00000000    0x50000510    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ1                    0x00000000    0x50000530    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ2                    0x00000000    0x50000550    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ3                    0x00000000    0x50000570    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ4                    0x00000000    0x50000590    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ5                    0x00000000    0x500005b0    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ6                    0x00000000    0x500005d0    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
    FS_HCTSIZ7                    0x00000000    0x500005f0    
        XFRSIZ                    0x00000       [18:0]        
        PKTCNT                    0x000         [28:19]       
        DPID                      0x0           [30:29]       
OTG_FS_GLOBAL                                                 
    FS_GOTGCTL                    0x001c0000    0x50000000    
        SRQSCS                    0             [0:0]         
        SRQ                       0             [1:1]         
        HNGSCS                    0             [8:8]         
        HNPRQ                     0             [9:9]         
        HSHNPEN                   0             [10:10]       
        DHNPEN                    0             [11:11]       
        CIDSTS                    0             [16:16]       
        DBCT                      0             [17:17]       
        ASVLD                     1             [18:18]       
        BSVLD                     1             [19:19]       
    FS_GOTGINT                    0x00000000    0x50000004    
        SEDET                     0             [2:2]         
        SRSSCHG                   0             [8:8]         
        HNSSCHG                   0             [9:9]         
        HNGDET                    0             [17:17]       
        ADTOCHG                   0             [18:18]       
        DBCDNE                    0             [19:19]       
    FS_GAHBCFG                    0x00000181    0x50000008    
        GINT                      1             [0:0]         
        TXFELVL                   1             [7:7]         
        PTXFELVL                  1             [8:8]         
    FS_GUSBCFG                    0x20001440    0x5000000c    
        TOCAL                     0x0           [2:0]         
        PHYSEL                    1             [6:6]         
        SRPCAP                    0             [8:8]         
        HNPCAP                    0             [9:9]         
        TRDT                      0x5           [13:10]       
        FHMOD                     1             [29:29]       
        FDMOD                     0             [30:30]       
        CTXPKT                    0             [31:31]       
    FS_GRSTCTL                    0x80000400    0x50000010    
        CSRST                     0             [0:0]         
        HSRST                     0             [1:1]         
        FCRST                     0             [2:2]         
        RXFFLSH                   0             [4:4]         
        TXFFLSH                   0             [5:5]         
        TXFNUM                    0x10          [10:6]        
        AHBIDL                    1             [31:31]       
    FS_GINTSTS                    0x35008029    0x50000014    
        CMOD                      1             [0:0]         
        MMIS                      0             [1:1]         
        OTGINT                    0             [2:2]         
        SOF                       1             [3:3]         
        RXFLVL                    0             [4:4]         
        NPTXFE                    1             [5:5]         
        GINAKEFF                  0             [6:6]         
        GOUTNAKEFF                0             [7:7]         
        ESUSP                     0             [10:10]       
        USBSUSP                   0             [11:11]       
        USBRST                    0             [12:12]       
        ENUMDNE                   0             [13:13]       
        ISOODRP                   0             [14:14]       
        EOPF                      1             [15:15]       
        IEPINT                    0             [18:18]       
        OEPINT                    0             [19:19]       
        IISOIXFR                  0             [20:20]       
        IPXFR_INCOMPISOOUT        0             [21:21]       
        HPRTINT                   1             [24:24]       
        HCINT                     0             [25:25]       
        PTXFE                     1             [26:26]       
        CIDSCHG                   1             [28:28]       
        DISCINT                   1             [29:29]       
        SRQINT                    0             [30:30]       
        WKUPINT                   0             [31:31]       
    FS_GINTMSK                    0x01000006    0x50000018    
        MMISM                     1             [1:1]         
        OTGINT                    1             [2:2]         
        SOFM                      0             [3:3]         
        RXFLVLM                   0             [4:4]         
        NPTXFEM                   0             [5:5]         
        GINAKEFFM                 0             [6:6]         
        GONAKEFFM                 0             [7:7]         
        ESUSPM                    0             [10:10]       
        USBSUSPM                  0             [11:11]       
        USBRST                    0             [12:12]       
        ENUMDNEM                  0             [13:13]       
        ISOODRPM                  0             [14:14]       
        EOPFM                     0             [15:15]       
        EPMISM                    0             [17:17]       
        IEPINT                    0             [18:18]       
        OEPINT                    0             [19:19]       
        IISOIXFRM                 0             [20:20]       
        IPXFRM_IISOOXFRM          0             [21:21]       
        PRTIM                     1             [24:24]       
        HCIM                      0             [25:25]       
        PTXFEM                    0             [26:26]       
        CIDSCHGM                  0             [28:28]       
        DISCINT                   0             [29:29]       
        SRQIM                     0             [30:30]       
        WUIM                      0             [31:31]       
    FS_GRXSTSR_Device             0xb55fddf7    0x5000001c    
        EPNUM                     0x7           [3:0]         
        BCNT                      0x5df         [14:4]        
        DPID                      0x3           [16:15]       
        PKTSTS                    0xf           [20:17]       
        FRMNUM                    0xa           [24:21]       
    FS_GRXSTSR_Host               0xb55fddf7    0x5000001c    
        EPNUM                     0x7           [3:0]         
        BCNT                      0x5df         [14:4]        
        DPID                      0x3           [16:15]       
        PKTSTS                    0xf           [20:17]       
        FRMNUM                    0xa           [24:21]       
    FS_GRXFSIZ                    0x00000200    0x50000024    
        RXFD                      0x0200        [15:0]        
    FS_GNPTXFSIZ_Device           0x02000200    0x50000028    
        TX0FSA                    0x0200        [15:0]        
        TX0FD                     0x0200        [31:16]       
    FS_GNPTXFSIZ_Host             0x02000200    0x50000028    
        NPTXFSA                   0x0200        [15:0]        
        NPTXFD                    0x0200        [31:16]       
    FS_GNPTXSTS                   0x00080200    0x5000002c    
        NPTXFSAV                  0x0200        [15:0]        
        NPTQXSAV                  0x08          [23:16]       
        NPTXQTOP                  0x00          [30:24]       
    FS_GCCFG                      0x0021ffff    0x50000038    
        PWRDWN                    1             [16:16]       
        VBUSASEN                  0             [18:18]       
        VBUSBSEN                  0             [19:19]       
        SOFOUTEN                  0             [20:20]       
    FS_CID                        0x00001200    0x5000003c    
        PRODUCT_ID                0x00001200    [31:0]        
    FS_HPTXFSIZ                   0x02000400    0x50000100    
        PTXSA                     0x0400        [15:0]        
        PTXFSIZ                   0x0200        [31:16]       
    FS_DIEPTXF1                   0x02000400    0x50000104    
        INEPTXSA                  0x0400        [15:0]        
        INEPTXFD                  0x0200        [31:16]       
    FS_DIEPTXF2                   0x02000400    0x50000108    
        INEPTXSA                  0x0400        [15:0]        
        INEPTXFD                  0x0200        [31:16]       
    FS_DIEPTXF3                   0x02000400    0x5000010c    
        INEPTXSA                  0x0400        [15:0]        
        INEPTXFD                  0x0200        [31:16]       
OTG_FS_PWRCLK                                                 
    FS_PCGCCTL                    0x00000000    0x50000e00    
        STPPCLK                   0             [0:0]         
        GATEHCLK                  0             [1:1]         
        PHYSUSP                   0             [4:4]         

 

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Bouncing signal on DP?

JW