TCAN4550-Q1: nINT is constantly pulled down by ECCERR

Filip Milev

Part Number: TCAN4550-Q1
Other Parts Discussed in Thread: TCAN4550

Hello

I'm running a rpi4 + a custom tcan4550 board via jumper wires.

I'm successfully able to bring the can interface up in linux (rpi4 linux 6.6.0) and am able to send a single message to a host PC, the host to rpi4 does not work.

This was traced to the interrupt being pulled down by an error ECCERR.

Here is a complete regdump:

0000: 4e414354
0004: 31353534
0008: 00110201
000c: 00000008
0010: 3f3f0000
0800: c80004a0
0804: 00000002
0808: 00000000
080c: 00000800
0810: 00000000
0814: 00000000
0818: 00000000
081c: 00000000
0820: 00010083
0824: 20010000
0828: 00000000
082c: 00000000
0830: ff96a8ff
1000: 32150320
1004: 87654321
1008: 00000000
100c: 00000a33
1010: 00000080
1014: 00000000
1018: 00000000
101c: 12018a13
1020: 000f0001
1024: 000057d2
1028: ffff0000
102c: 0000ffff
1030: 00000000
1034: 00000000
1038: 00000000
103c: 00000000
1040: 00000000
1044: 0000070f
1048: 00000000
104c: 00000000
1050: 20010000
1054: 07b79289
1058: 00000000
105c: 00000001
1060: 00000000
1064: 00000000
1068: 00000000
106c: 00000000
1070: 00000000
1074: 00000000
1078: 00000000
107c: 00000000
1080: 00000000
1084: 00000000
1088: 00000000
108c: 00000000
1090: 1fffffff
1094: 00000000
1098: 00000000
109c: 00000000
10a0: 00100000
10a4: 00000000
10a8: 00000000
10ac: 00000000
10b0: 00000480
10b4: 00000000
10b8: 00000000
10bc: 00000777
10c0: 01000488
10c4: 00000001
10c8: 00000007
10cc: 00000000
10d0: 00000000
10d4: 00000000
10d8: 00000000
10dc: 00000000
10e0: 00000000
10e4: 00000000
10e8: 00000000
10ec: 00000000
10f0: 00010480
10f4: 00000000
10f8: 00000000
10fc: 00000000
8000: 00000000
8004: 00000000
8008: 00000000
800c: 00000000
8010: 00000000
8014: 00000000
8018: 00000000
801c: 00000000
8020: 00000000
8024: 00000000
8028: 00000000
802c: 00000000
8030: 00000000
8034: 00000000
8038: 00000000
803c: 00000000
8040: 00000000
8044: 00000000
8048: 00000000
804c: 00000000
8050: 00000000
8054: 00000000
8058: 00000000
805c: 00000000
8060: 00000000
8064: 00000000
8068: 00000000
806c: 00000000
8070: 00000000
8074: 00000000
8078: 00000000
807c: 00000000
8080: 00000000
8084: 00000000
8088: 00000000
808c: 00000000
8090: 00000000
8094: 00000000
8098: 00000000
809c: 00000000
80a0: 00000000
80a4: 00000000
80a8: 00000000
80ac: 00000000
80b0: 00000000
80b4: 00000000
80b8: 00000000
80bc: 00000000
80c0: 00000000
80c4: 00000000
80c8: 00000000
80cc: 00000000
80d0: 00000000
80d4: 00000000
80d8: 00000000
80dc: 00000000
80e0: 00000000
80e4: 00000000
80e8: 00000000
80ec: 00000000
80f0: 00000000
80f4: 00000000
80f8: 00000000
80fc: 00000000
8100: 00000000
8104: 00000000
8108: 00000000
810c: 00000000
8110: 00000000
8114: 00000000
8118: 00000000
811c: 00000000
8120: 00000000
8124: 00000000
8128: 00000000
812c: 00000000
8130: 00000000
8134: 00000000
8138: 00000000
813c: 00000000
8140: 00000000
8144: 00000000
8148: 00000000
814c: 00000000
8150: 00000000
8154: 00000000
8158: 00000000
815c: 00000000
8160: 00000000
8164: 00000000
8168: 00000000
816c: 00000000
8170: 00000000
8174: 00000000
8178: 00000000
817c: 00000000
8180: 00000000
8184: 00000000
8188: 00000000
818c: 00000000
8190: 00000000
8194: 00000000
8198: 00000000
819c: 00000000
81a0: 00000000
81a4: 00000000
81a8: 00000000
81ac: 00000000
81b0: 00000000
81b4: 00000000
81b8: 00000000
81bc: 00000000
81c0: 00000000
81c4: 00000000
81c8: 00000000
81cc: 00000000
81d0: 00000000
81d4: 00000000
81d8: 00000000
81dc: 00000000
81e0: 00000000
81e4: 00000000
81e8: 00000000
81ec: 00000000
81f0: 00000000
81f4: 00000000
81f8: 00000000
81fc: 00000000
8200: 00000000
8204: 00000000
8208: 00000000
820c: 00000000
8210: 00000000
8214: 00000000
8218: 00000000
821c: 00000000
8220: 00000000
8224: 00000000
8228: 00000000
822c: 00000000
8230: 00000000
8234: 00000000
8238: 00000000
823c: 00000000
8240: 00000000
8244: 00000000
8248: 00000000
824c: 00000000
8250: 00000000
8254: 00000000
8258: 00000000
825c: 00000000
8260: 00000000
8264: 00000000
8268: 00000000
826c: 00000000
8270: 00000000
8274: 00000000
8278: 00000000
827c: 00000000
8280: 00000000
8284: 00000000
8288: 00000000
828c: 00000000
8290: 00000000
8294: 00000000
8298: 00000000
829c: 00000000
82a0: 00000000
82a4: 00000000
82a8: 00000000
82ac: 00000000
82b0: 00000000
82b4: 00000000
82b8: 00000000
82bc: 00000000
82c0: 00000000
82c4: 00000000
82c8: 00000000
82cc: 00000000
82d0: 00000000
82d4: 00000000
82d8: 00000000
82dc: 00000000
82e0: 00000000
82e4: 00000000
82e8: 00000000
82ec: 00000000
82f0: 00000000
82f4: 00000000
82f8: 00000000
82fc: 00000000
8300: 00000000
8304: 00000000
8308: 00000000
830c: 00000000
8310: 00000000
8314: 00000000
8318: 00000000
831c: 00000000
8320: 00000000
8324: 00000000
8328: 00000000
832c: 00000000
8330: 00000000
8334: 00000000
8338: 00000000
833c: 00000000
8340: 00000000
8344: 00000000
8348: 00000000
834c: 00000000
8350: 00000000
8354: 00000000
8358: 00000000
835c: 00000000
8360: 00000000
8364: 00000000
8368: 00000000
836c: 00000000
8370: 00000000
8374: 00000000
8378: 00000000
837c: 00000000
8380: 00000000
8384: 00000000
8388: 00000000
838c: 00000000
8390: 00000000
8394: 00000000
8398: 00000000
839c: 00000000
83a0: 00000000
83a4: 00000000
83a8: 00000000
83ac: 00000000
83b0: 00000000
83b4: 00000000
83b8: 00000000
83bc: 00000000
83c0: 00000000
83c4: 00000000
83c8: 00000000
83cc: 00000000
83d0: 00000000
83d4: 00000000
83d8: 00000000
83dc: 00000000
83e0: 00000000
83e4: 00000000
83e8: 00000000
83ec: 00000000
83f0: 00000000
83f4: 00000000
83f8: 00000000
83fc: 00000000
8400: 00000000
8404: 00000000
8408: 00000000
840c: 00000000
8410: 00000000
8414: 00000000
8418: 00000000
841c: 00000000
8420: 00000000
8424: 00000000
8428: 00000000
842c: 00000000
8430: 00000000
8434: 00000000
8438: 00000000
843c: 00000000
8440: 00000000
8444: 00000000
8448: 00000000
844c: 00000000
8450: 00000000
8454: 00000000
8458: 00000000
845c: 00000000
8460: 00000000
8464: 00000000
8468: 00000000
846c: 00000000
8470: 00000000
8474: 00000000
8478: 00000000
847c: 00000000
8480: 00000000
8484: 00000000
8488: 00000000
848c: 00000000
8490: 00000000
8494: 00000000
8498: 00000000
849c: 00000000
84a0: 00000000
84a4: 00000000
84a8: 00000000
84ac: 00000000
84b0: 00000000
84b4: 00000000
84b8: 00000000
84bc: 00000000
84c0: 00000000
84c4: 00000000
84c8: 00000000
84cc: 00000000
84d0: 9d75d299
84d4: 312bcdc7
84d8: 749df79c
84dc: ef0a839e
84e0: aea1f6f9
84e4: 9c296240
84e8: 1abc3d5f
84ec: ca31baa9
84f0: ae4768f1
84f4: 06058c64
84f8: 1059726e
84fc: 3b7b7e88
8500: 0e38f2fb
8504: 70a09b58
8508: d7991d69
850c: 74bfcb29
8510: c2ecd5de
8514: 63f8db52
8518: b21863cb
851c: 68abb8e7
8520: adee0dcf
8524: d9e49ccd
8528: 9f82f5bd
852c: 93d8a8ae
8530: 1f703b53
8534: deb89c6a
8538: d24afbfe
853c: 3defac86
8540: afc68c28
8544: 74a61a0d
8548: 87f205ec
854c: a1a85e7a
8550: c59c087a
8554: db2caee9
8558: d35eb126
855c: f7f9e409
8560: 58664455
8564: 53826046
8568: 3d129148
856c: 93184d16
8570: 6ef60c84
8574: b915e3ad
8578: fdba1934
857c: 82353633
8580: eecc9673
8584: df138d67
8588: 0a0de9cc
858c: 8f6beb17
8590: 620e33f9
8594: 3a87ef82
8598: 8bb6c840
859c: b2c25297
85a0: f990741c
85a4: ed720cc5
85a8: 73cb2b42
85ac: 4f1c7c35
85b0: f754972f
85b4: 395331ca
85b8: 71b50d48
85bc: da247f77
85c0: ec5f7f3c
85c4: a4358046
85c8: 6bb0757b
85cc: 205e6716
85d0: d2dbcf4c
85d4: 0046473f
85d8: 7baaa161
85dc: 55447358
85e0: 0a1eb4ed
85e4: dbdcc5c6
85e8: 1cc929d6
85ec: a0e12f8f
85f0: 51931f45
85f4: a5307ae7
85f8: e7daffda
85fc: 23777b09
8600: 153155bc
8604: 1fbb9775
8608: fecd5c96
860c: dcabd7d0
8610: 56201737
8614: 3c23e16c
8618: 33a3373d
861c: 588866ce
8620: d2f4b743
8624: 2bfa1cd5
8628: c78fa905
862c: c435a0fa
8630: fe390f35
8634: 79b3d8fc
8638: 3511dc1e
863c: 0d8b6632
8640: 01f96c83
8644: f0afd4e0
8648: c9d1f0a9
864c: 13e5d0f0
8650: 3544a06f
8654: 1626cc89
8658: 27d897ab
865c: 57b293ba
8660: b814d243
8664: a60deff4
8668: 57a618c4
866c: 8bb9bb6a
8670: 701ba04e
8674: b663f751
8678: 47c4615c
867c: edacc511
8680: 2fca043e
8684: 6800c2af
8688: 41c625e2
868c: bf97cc50
8690: 3d1f84e0
8694: 4bd77807
8698: 0a7ff20e
869c: 30549cf1
86a0: 5a2ef5dd
86a4: 7b185928
86a8: 9d66b7d4
86ac: 5dbb4019
86b0: 1aeba2cc
86b4: 2201dd8b
86b8: 8f986a66
86bc: 20016d2f
86c0: 2ebcf72e
86c4: 380d6165
86c8: f06ac2fd
86cc: ef7ccc0d
86d0: a2fbeb30
86d4: 23f55dac
86d8: bcadfeea
86dc: 12479c96
86e0: 0e4d3fe7
86e4: c5a5ef1c
86e8: 7e4a5690
86ec: 8644f1b5
86f0: 737b77ac
86f4: 38a618b4
86f8: 4c66382e
86fc: 390485c7
8700: 8ef16561
8704: 33c9ee7a
8708: eed0a221
870c: 603c7d20
8710: 5175698f
8714: 14d877b2
8718: 4ae11be9
871c: 14a8ca70
8720: 3e545d65
8724: 29ca875f
8728: b261eda8
872c: a19a8476
8730: dee77b4e
8734: 3d2fcb66
8738: 5b5bc513
873c: 26081f9e
8740: 5f0d17be
8744: 2c0e66ff
8748: 602ae84c
874c: b3b700ba
8750: c34dbccc
8754: 2d07911b
8758: 5082a75f
875c: 27e82274
8760: 49a44524
8764: e10ac379
8768: bb039ee7
876c: 3982eea9
8770: d80cc548
8774: a2e35393
8778: 3bcca1f7
877c: 6d63b4ac
8780: a3ee0333
8784: c04966ad
8788: ab9a26b9
878c: 7f70f289
8790: e4dec824
8794: 9e041bde
8798: acb5bd5e
879c: 7b493fa1
87a0: be12acc3
87a4: 7c78958f
87a8: c4681d0e
87ac: 8a7bf81f
87b0: 16034df5
87b4: 49ffd1ae
87b8: 6cb48107
87bc: 845ffcf9
87c0: 6b690c57
87c4: 98d5f2f1
87c8: c2a7d076
87cc: 94fa6918
87d0: 6364e74b
87d4: 95a665eb
87d8: ce8cb0f5
87dc: a7140269
87e0: 4c086164
87e4: 1e23e499
87e8: a556d5ea
87ec: e1a31e51
87f0: 84884202
87f4: 4411fc87
87f8: 8c22f36a
87fc: cad32d4b

I've tried to mask the interrupt but I see it anyway after I tried to send/receive data. (see attached log)

Fullscreen log-can-rpi4.txt Download

root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# ip ip link set can0 type can bitrate 125000^C
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# ip link set can0 type can bitrate 125000
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# ip link set up can0
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cat /proc/interrupts 
           CPU0       CPU1       CPU2       CPU3       
  9:          0          0          0          0     GICv2  25 Level     vgic
 11:      19387      15152      17045      15874     GICv2  30 Level     arch_timer
 12:          0          0          0          0     GICv2  27 Level     kvm guest vtimer
 14:       5799          0          0          0     GICv2  65 Level     fe00b880.mailbox
 15:        635          0          0          0     GICv2 114 Level     DMA IRQ
 16:          0          0          0          0     GICv2 116 Level     DMA IRQ
 17:          0          0          0          0     GICv2 117 Level     DMA IRQ
 21:          0          0          0          0     GICv2 122 Level     DMA IRQ
 22:          0          0          0          0     GICv2 123 Level     DMA IRQ
 27:          0          0          0          0     GICv2 175 Level     PCIe PME, aerdrv
 28:       2612          0          0          0     GICv2 189 Level     eth0
 29:        620          0          0          0     GICv2 190 Level     eth0
 30:         94          0          0          0     GICv2  66 Level     VCHIQ doorbell
 31:          0          0          0          0     GICv2  48 Level     arm-pmu
 32:          0          0          0          0     GICv2  49 Level     arm-pmu
 33:          0          0          0          0     GICv2  50 Level     arm-pmu
 34:          0          0          0          0     GICv2  51 Level     arm-pmu
 35:       7192          0          0          0     GICv2 153 Level     uart-pl011
 36:      80930          0          0          0     GICv2 158 Level     mmc1, mmc0
 37:          0          0          0          0     GICv2 150 Level     fe204000.spi
 38:          0          0          0          0     GICv2 149 Level     fe804000.i2c
 39:         38          0          0          0  BRCM STB PCIe MSI 524288 Edge      xhci_hcd
 40:         89          0          0          0     GICv2 105 Level     fe980000.usb, fe980000.usb
 41:          0          0          0          0     GICv2 106 Level     v3d
 42:     100002          0          0          0  pinctrl-bcm2835  25 Level     can0
 43:          0          0          0          0     GICv2 130 Level     feb10000.codec
 44:          0          0          0          0     GICv2 129 Level     vc4 hvs
 45:          0          0          0          0  interrupt-controller@7ef00100   4 Edge      vc4 hdmi hpd connected
 46:          0          0          0          0  interrupt-controller@7ef00100   5 Edge      vc4 hdmi hpd disconnected
 47:          0          0          0          0  interrupt-controller@7ef00100   1 Edge      vc4 hdmi cec rx
 48:          0          0          0          0  interrupt-controller@7ef00100   0 Edge      vc4 hdmi cec tx
 49:          0          0          0          0  interrupt-controller@7ef00100  10 Edge      vc4 hdmi hpd connected
 50:          0          0          0          0  interrupt-controller@7ef00100  11 Edge      vc4 hdmi hpd disconnected
 51:          0          0          0          0  interrupt-controller@7ef00100   7 Edge      vc4 hdmi cec rx
 52:          0          0          0          0  interrupt-controller@7ef00100   8 Edge      vc4 hdmi cec tx
 53:          0          0          0          0     GICv2 107 Level     fe004000.txp
 54:          0          0          0          0     GICv2 141 Level     vc4 crtc
 55:          0          0          0          0     GICv2 142 Level     vc4 crtc, vc4 crtc
 56:          0          0          0          0     GICv2 133 Level     vc4 crtc
 57:          0          0          0          0     GICv2 138 Level     vc4 crtc
IPI0:      5370       3370       3385       6633       Rescheduling interrupts
IPI1:      9966      21273      15471     113224       Function call interrupts
IPI2:         0          0          0          0       CPU stop interrupts
IPI3:         0          0          0          0       CPU stop (for crash dump) interrupts
IPI4:         0          0          0          0       Timer broadcast interrupts
IPI5:      4385       2357       1986       2304       IRQ work interrupts
IPI6:         0          0          0          0       CPU wake-up interrupts
Err:          0
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cat registers 
0000: 4e414354
0004: 31353534
0008: 00110201
000c: 00000008
0010: 3f3f0000
0800: c80004a0
0804: 00000002
0808: 00000000
080c: 00000800
0810: 00000000
0814: 00000000
0818: 00000000
081c: 00000000
0820: 00000082
0824: 00010000
0828: 00000000
082c: 00000000
0830: ff96a8ff
1000: 32150320
1004: 87654321
1008: 00000000
100c: 00000a33
1010: 00000080
1014: 00000000
1018: 00000000
101c: 12018a13
1020: 000f0001
1024: 000084ad
1028: ffff0000
102c: 0000ffff
1030: 00000000
1034: 00000000
1038: 00000000
103c: 00000000
1040: 00000000
1044: 0000070f
1048: 00000000
104c: 00000000
1050: 20010000
1054: 07b79289
1058: 00000000
105c: 00000001
1060: 00000000
1064: 00000000
1068: 00000000
106c: 00000000
1070: 00000000
1074: 00000000
1078: 00000000
107c: 00000000
1080: 00000000
1084: 00000000
1088: 00000000
108c: 00000000
1090: 1fffffff
1094: 00000000
1098: 00000000
109c: 00000000
10a0: 00100000
10a4: 00000000
10a8: 00000000
10ac: 00000000
10b0: 00000480
10b4: 00000000
10b8: 00000000
10bc: 00000777
10c0: 01000488
10c4: 00000001
10c8: 00000007
10cc: 00000000
10d0: 00000000
10d4: 00000000
10d8: 00000000
10dc: 00000000
10e0: 00000000
10e4: 00000000
10e8: 00000000
10ec: 00000000
10f0: 00010480
10f4: 00000000
10f8: 00000000
10fc: 00000000
8000: 00000000
8004: 00000000
8008: 00000000
800c: 00000000
8010: 00000000
8014: 00000000
8018: 00000000
801c: 00000000
8020: 00000000
8024: 00000000
8028: 00000000
802c: 00000000
8030: 00000000
8034: 00000000
8038: 00000000
803c: 00000000
8040: 00000000
8044: 00000000
8048: 00000000
804c: 00000000
8050: 00000000
8054: 00000000
8058: 00000000
805c: 00000000
8060: 00000000
8064: 00000000
8068: 00000000
806c: 00000000
8070: 00000000
8074: 00000000
8078: 00000000
807c: 00000000
8080: 00000000
8084: 00000000
8088: 00000000
808c: 00000000
8090: 00000000
8094: 00000000
8098: 00000000
809c: 00000000
80a0: 00000000
80a4: 00000000
80a8: 00000000
80ac: 00000000
80b0: 00000000
80b4: 00000000
80b8: 00000000
80bc: 00000000
80c0: 00000000
80c4: 00000000
80c8: 00000000
80cc: 00000000
80d0: 00000000
80d4: 00000000
80d8: 00000000
80dc: 00000000
80e0: 00000000
80e4: 00000000
80e8: 00000000
80ec: 00000000
80f0: 00000000
80f4: 00000000
80f8: 00000000
80fc: 00000000
8100: 00000000
8104: 00000000
8108: 00000000
810c: 00000000
8110: 00000000
8114: 00000000
8118: 00000000
811c: 00000000
8120: 00000000
8124: 00000000
8128: 00000000
812c: 00000000
8130: 00000000
8134: 00000000
8138: 00000000
813c: 00000000
8140: 00000000
8144: 00000000
8148: 00000000
814c: 00000000
8150: 00000000
8154: 00000000
8158: 00000000
815c: 00000000
8160: 00000000
8164: 00000000
8168: 00000000
816c: 00000000
8170: 00000000
8174: 00000000
8178: 00000000
817c: 00000000
8180: 00000000
8184: 00000000
8188: 00000000
818c: 00000000
8190: 00000000
8194: 00000000
8198: 00000000
819c: 00000000
81a0: 00000000
81a4: 00000000
81a8: 00000000
81ac: 00000000
81b0: 00000000
81b4: 00000000
81b8: 00000000
81bc: 00000000
81c0: 00000000
81c4: 00000000
81c8: 00000000
81cc: 00000000
81d0: 00000000
81d4: 00000000
81d8: 00000000
81dc: 00000000
81e0: 00000000
81e4: 00000000
81e8: 00000000
81ec: 00000000
81f0: 00000000
81f4: 00000000
81f8: 00000000
81fc: 00000000
8200: 00000000
8204: 00000000
8208: 00000000
820c: 00000000
8210: 00000000
8214: 00000000
8218: 00000000
821c: 00000000
8220: 00000000
8224: 00000000
8228: 00000000
822c: 00000000
8230: 00000000
8234: 00000000
8238: 00000000
823c: 00000000
8240: 00000000
8244: 00000000
8248: 00000000
824c: 00000000
8250: 00000000
8254: 00000000
8258: 00000000
825c: 00000000
8260: 00000000
8264: 00000000
8268: 00000000
826c: 00000000
8270: 00000000
8274: 00000000
8278: 00000000
827c: 00000000
8280: 00000000
8284: 00000000
8288: 00000000
828c: 00000000
8290: 00000000
8294: 00000000
8298: 00000000
829c: 00000000
82a0: 00000000
82a4: 00000000
82a8: 00000000
82ac: 00000000
82b0: 00000000
82b4: 00000000
82b8: 00000000
82bc: 00000000
82c0: 00000000
82c4: 00000000
82c8: 00000000
82cc: 00000000
82d0: 00000000
82d4: 00000000
82d8: 00000000
82dc: 00000000
82e0: 00000000
82e4: 00000000
82e8: 00000000
82ec: 00000000
82f0: 00000000
82f4: 00000000
82f8: 00000000
82fc: 00000000
8300: 00000000
8304: 00000000
8308: 00000000
830c: 00000000
8310: 00000000
8314: 00000000
8318: 00000000
831c: 00000000
8320: 00000000
8324: 00000000
8328: 00000000
832c: 00000000
8330: 00000000
8334: 00000000
8338: 00000000
833c: 00000000
8340: 00000000
8344: 00000000
8348: 00000000
834c: 00000000
8350: 00000000
8354: 00000000
8358: 00000000
835c: 00000000
8360: 00000000
8364: 00000000
8368: 00000000
836c: 00000000
8370: 00000000
8374: 00000000
8378: 00000000
837c: 00000000
8380: 00000000
8384: 00000000
8388: 00000000
838c: 00000000
8390: 00000000
8394: 00000000
8398: 00000000
839c: 00000000
83a0: 00000000
83a4: 00000000
83a8: 00000000
83ac: 00000000
83b0: 00000000
83b4: 00000000
83b8: 00000000
83bc: 00000000
83c0: 00000000
83c4: 00000000
83c8: 00000000
83cc: 00000000
83d0: 00000000
83d4: 00000000
83d8: 00000000
83dc: 00000000
83e0: 00000000
83e4: 00000000
83e8: 00000000
83ec: 00000000
83f0: 00000000
83f4: 00000000
83f8: 00000000
83fc: 00000000
8400: 00000000
8404: 00000000
8408: 00000000
840c: 00000000
8410: 00000000
8414: 00000000
8418: 00000000
841c: 00000000
8420: 00000000
8424: 00000000
8428: 00000000
842c: 00000000
8430: 00000000
8434: 00000000
8438: 00000000
843c: 00000000
8440: 00000000
8444: 00000000
8448: 00000000
844c: 00000000
8450: 00000000
8454: 00000000
8458: 00000000
845c: 00000000
8460: 00000000
8464: 00000000
8468: 00000000
846c: 00000000
8470: 00000000
8474: 00000000
8478: 00000000
847c: 00000000
8480: 00000000
8484: 00000000
8488: 00000000
848c: 00000000
8490: 00000000
8494: 00000000
8498: 00000000
849c: 00000000
84a0: 00000000
84a4: 00000000
84a8: 00000000
84ac: 00000000
84b0: 00000000
84b4: 00000000
84b8: 00000000
84bc: 00000000
84c0: 00000000
84c4: 00000000
84c8: 00000000
84cc: 00000000
84d0: 8c75d299
84d4: 312bcdc7
84d8: 2c9dd79c
84dc: ff0a829c
84e0: 8e25f6f9
84e4: 8c086240
84e8: 18bc0d1f
84ec: ea31faa9
84f0: 2e6d68e1
84f4: 0c158c24
84f8: 1859604e
84fc: 3f7b7e18
8500: 0a38f3f8
8504: f0a01b58
8508: d7d91d69
850c: 64bfdb29
8510: 82e8d5de
8514: 61b8da53
8518: b00873eb
851c: 68afa8e7
8520: ade70d8f
8524: d9649ccd
8528: df82d5bd
852c: d1d8acae
8530: 1f70b753
8534: deb8886a
8538: 934afbfe
853c: 3defac86
8540: efc68e38
8544: f4a40a4c
8548: 87f64de4
854c: a1381e72
8550: c5980a7a
8554: 5f2caee9
8558: d3de9222
855c: f7bbe40d
8560: 58664055
8564: 538a6046
8568: 3d129908
856c: 91994d36
8570: 4ed64484
8574: bd15e7ad
8578: fdba19b4
857c: 8235b63b
8580: feccd673
8584: df138d47
8588: 0a0de9cc
858c: 876afb93
8590: 620a33f1
8594: 388eef83
8598: 8bb6c840
859c: b2c21297
85a0: f998749c
85a4: 7d701cc5
85a8: 52c96b60
85ac: 4f1cfcb5
85b0: d754972f
85b4: 39d235ca
85b8: 739d8ddc
85bc: da647ff7
85c0: ec5f772c
85c4: a4318067
85c8: 2ab0757b
85cc: 60566514
85d0: 9adb8d1c
85d4: 0042213f
85d8: 7ba8a141
85dc: d5447b58
85e0: 0a1eb4e9
85e4: dbcc45c6
85e8: 1cc939d6
85ec: a0e17b8f
85f0: 531b1d55
85f4: a5307ae7
85f8: f75afbca
85fc: 23777b09
8600: 953915bc
8604: 9fbb9774
8608: fecc58b6
860c: d8bbd7d0
8610: 56881736
8614: 3d23f16c
8618: b2a3353d
861c: 588d66ce
8620: d6f5b747
8624: 2bfa1cd5
8628: 978fe985
862c: c435a1fa
8630: b6392b35
8634: 79b2fafc
8638: 36057c1c
863c: 0d896632
8640: 01f96c8b
8644: f2afd4e1
8648: dbd1d0ad
864c: 13e590e0
8650: 3704a06d
8654: 1627c889
8658: 23d897ba
865c: 55a693ba
8660: b014d2c3
8664: b64d4ff4
8668: 57ae08c4
866c: 49b9bb62
8670: 701b244e
8674: b661e559
8678: 47c4691c
867c: ecaca715
8680: 2dca043e
8684: 08a0c38f
8688: 41c269e2
868c: bf97cc50
8690: 3d1d86e0
8694: 0357780b
8698: 0f7ff20e
869c: 30549df3
86a0: 1a2eb1bd
86a4: 5b185d2a
86a8: 9d66b7d4
86ac: 5dbb4019
86b0: 12eba20c
86b4: 22015dca
86b8: 8f986a66
86bc: 61056d2f
86c0: 2eacf72c
86c4: 284d2165
86c8: f02ac3ef
86cc: ef7ccc0d
86d0: e2fb6b10
86d4: 23d514ae
86d8: bcadfeea
86dc: 12478c96
86e0: cc4d2fc7
86e4: c7a5ef1c
86e8: 7e4a5400
86ec: c644d1b5
86f0: 737b77ac
86f4: 78a718b4
86f8: 44473a2e
86fc: 390c05c7
8700: c671e503
8704: 3fcbae7a
8708: eed0a221
870c: 601c4fa0
8710: 5175e987
8714: 54987fb2
8718: 9af33be9
871c: 14a8cb70
8720: 3f545d45
8724: 29ca874f
8728: b265c529
872c: 019a8466
8730: dec77a4e
8734: 7d2febec
8738: 5a5b8550
873c: 26080f86
8740: 5fed17be
8744: 252e66fd
8748: 624a604c
874c: 93b7003a
8750: c37dbc5c
8754: 2807b91b
8758: 5086a75f
875c: 23ec2274
8760: 49a44524
8764: e90ad779
8768: bb839ee6
876c: 2982eca9
8770: d80ccdd8
8774: a6e35383
8778: 3bcca1f7
877c: e9e3b4ac
8780: a3ee0333
8784: c0496ead
8788: ab9a26b9
878c: 7f40fe89
8790: a65ec824
8794: 9f540bdc
8798: ecb5ad5e
879c: 73493f20
87a0: ae12acc3
87a4: 7c38958f
87a8: c4e83408
87ac: 1c7bf81f
87b0: 16036de5
87b4: 49ffd1ae
87b8: 68b78547
87bc: 851efcf8
87c0: 6e298c77
87c4: 98d1d2f1
87c8: c0a79076
87cc: d5fa6d18
87d0: 4364e767
87d4: 878665e3
87d8: ce8cb4f5
87dc: a71c2269
87e0: cd086164
87e4: 1e23a499
87e8: a516d5ea
87ec: e1a31e51
87f0: 94884202
87f4: 4451fcc7
87f8: 8c02f360
87fc: cad32d4b
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# ^C
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# candump can0
^Croot@sdr-sim:/sys/kernel/debug/regmap/spi0.0# candump can0^C
(failed reverse-i-search)`canse': candump ^Cn0
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cansend can0 610#000000
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cansend can0 610#000000
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cansend can0 610#000000
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cansend can0 610#000000
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# ^C
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# cat registers 
0000: 4e414354
0004: 31353534
0008: 00110201
000c: 00000008
0010: 3f3f0000
0800: c80004a0
0804: 00000002
0808: 00000000
080c: 00000800
0810: 00000000
0814: 00000000
0818: 00000000
081c: 00000000
0820: 000104a3
0824: 20015801
0828: 00000000
082c: 00000000
0830: ff96a8ff
1000: 32150320
1004: 87654321
1008: 00000000
100c: 00000a33
1010: 00000080
1014: 00000000
1018: 00000000
101c: 12018a13
1020: 000f0001
1024: 00004411
1028: ffff0000
102c: 0000ffff
1030: 00000000
1034: 00000000
1038: 00000000
103c: 00000000
1040: 00000000
1044: 00000708
1048: 00000000
104c: 00000000
1050: 20015801
1054: 07b79289
1058: 00000000
105c: 00000001
1060: 00000000
1064: 00000000
1068: 00000000
106c: 00000000
1070: 00000000
1074: 00000000
1078: 00000000
107c: 00000000
1080: 00000000
1084: 00000000
1088: 00000000
108c: 00000000
1090: 1fffffff
1094: 00000000
1098: 00000000
109c: 00000000
10a0: 00100000
10a4: 00010001
10a8: 00000000
10ac: 00000000
10b0: 00000480
10b4: 00000000
10b8: 00000000
10bc: 00000777
10c0: 01000488
10c4: 00000001
10c8: 00000007
10cc: 00000000
10d0: 00000000
10d4: 00000000
10d8: 00000001
10dc: 00000000
10e0: 00000000
10e4: 00000000
10e8: 00000000
10ec: 00000000
10f0: 00010480
10f4: 01000001
10f8: 00000000
10fc: 00000000
8000: 18400c20
8004: ff03e7ce
8008: 00000000
800c: 00000000
8010: 00000000
8014: 00000000
8018: 00000000
801c: 00000000
8020: 00000000
8024: 00000000
8028: 00000000
802c: 00000000
8030: 00000000
8034: 00000000
8038: 00000000
803c: 00000000
8040: 00000000
8044: 00000000
8048: 00000000
804c: 00000000
8050: 00000000
8054: 00000000
8058: 00000000
805c: 00000000
8060: 00000000
8064: 00000000
8068: 00000000
806c: 00000000
8070: 00000000
8074: 00000000
8078: 00000000
807c: 00000000
8080: 00000000
8084: 00000000
8088: 00000000
808c: 00000000
8090: 00000000
8094: 00000000
8098: 00000000
809c: 00000000
80a0: 00000000
80a4: 00000000
80a8: 00000000
80ac: 00000000
80b0: 00000000
80b4: 00000000
80b8: 00000000
80bc: 00000000
80c0: 00000000
80c4: 00000000
80c8: 00000000
80cc: 00000000
80d0: 00000000
80d4: 00000000
80d8: 00000000
80dc: 00000000
80e0: 00000000
80e4: 00000000
80e8: 00000000
80ec: 00000000
80f0: 00000000
80f4: 00000000
80f8: 00000000
80fc: 00000000
8100: 00000000
8104: 00000000
8108: 00000000
810c: 00000000
8110: 00000000
8114: 00000000
8118: 00000000
811c: 00000000
8120: 00000000
8124: 00000000
8128: 00000000
812c: 00000000
8130: 00000000
8134: 00000000
8138: 00000000
813c: 00000000
8140: 00000000
8144: 00000000
8148: 00000000
814c: 00000000
8150: 00000000
8154: 00000000
8158: 00000000
815c: 00000000
8160: 00000000
8164: 00000000
8168: 00000000
816c: 00000000
8170: 00000000
8174: 00000000
8178: 00000000
817c: 00000000
8180: 00000000
8184: 00000000
8188: 00000000
818c: 00000000
8190: 00000000
8194: 00000000
8198: 00000000
819c: 00000000
81a0: 00000000
81a4: 00000000
81a8: 00000000
81ac: 00000000
81b0: 00000000
81b4: 00000000
81b8: 00000000
81bc: 00000000
81c0: 00000000
81c4: 00000000
81c8: 00000000
81cc: 00000000
81d0: 00000000
81d4: 00000000
81d8: 00000000
81dc: 00000000
81e0: 00000000
81e4: 00000000
81e8: 00000000
81ec: 00000000
81f0: 00000000
81f4: 00000000
81f8: 00000000
81fc: 00000000
8200: 00000000
8204: 00000000
8208: 00000000
820c: 00000000
8210: 00000000
8214: 00000000
8218: 00000000
821c: 00000000
8220: 00000000
8224: 00000000
8228: 00000000
822c: 00000000
8230: 00000000
8234: 00000000
8238: 00000000
823c: 00000000
8240: 00000000
8244: 00000000
8248: 00000000
824c: 00000000
8250: 00000000
8254: 00000000
8258: 00000000
825c: 00000000
8260: 00000000
8264: 00000000
8268: 00000000
826c: 00000000
8270: 00000000
8274: 00000000
8278: 00000000
827c: 00000000
8280: 00000000
8284: 00000000
8288: 00000000
828c: 00000000
8290: 00000000
8294: 00000000
8298: 00000000
829c: 00000000
82a0: 00000000
82a4: 00000000
82a8: 00000000
82ac: 00000000
82b0: 00000000
82b4: 00000000
82b8: 00000000
82bc: 00000000
82c0: 00000000
82c4: 00000000
82c8: 00000000
82cc: 00000000
82d0: 00000000
82d4: 00000000
82d8: 00000000
82dc: 00000000
82e0: 00000000
82e4: 00000000
82e8: 00000000
82ec: 00000000
82f0: 00000000
82f4: 00000000
82f8: 00000000
82fc: 00000000
8300: 00000000
8304: 00000000
8308: 00000000
830c: 00000000
8310: 00000000
8314: 00000000
8318: 00000000
831c: 00000000
8320: 00000000
8324: 00000000
8328: 00000000
832c: 00000000
8330: 00000000
8334: 00000000
8338: 00000000
833c: 00000000
8340: 00000000
8344: 00000000
8348: 00000000
834c: 00000000
8350: 00000000
8354: 00000000
8358: 00000000
835c: 00000000
8360: 00000000
8364: 00000000
8368: 00000000
836c: 00000000
8370: 00000000
8374: 00000000
8378: 00000000
837c: 00000000
8380: 00000000
8384: 00000000
8388: 00000000
838c: 00000000
8390: 00000000
8394: 00000000
8398: 00000000
839c: 00000000
83a0: 00000000
83a4: 00000000
83a8: 00000000
83ac: 00000000
83b0: 00000000
83b4: 00000000
83b8: 00000000
83bc: 00000000
83c0: 00000000
83c4: 00000000
83c8: 00000000
83cc: 00000000
83d0: 00000000
83d4: 00000000
83d8: 00000000
83dc: 00000000
83e0: 00000000
83e4: 00000000
83e8: 00000000
83ec: 00000000
83f0: 00000000
83f4: 00000000
83f8: 00000000
83fc: 00000000
8400: 00000000
8404: 00000000
8408: 00000000
840c: 00000000
8410: 00000000
8414: 00000000
8418: 00000000
841c: 00000000
8420: 00000000
8424: 00000000
8428: 00000000
842c: 00000000
8430: 00000000
8434: 00000000
8438: 00000000
843c: 00000000
8440: 00000000
8444: 00000000
8448: 00000000
844c: 00000000
8450: 00000000
8454: 00000000
8458: 00000000
845c: 00000000
8460: 00000000
8464: 00000000
8468: 00000000
846c: 00000000
8470: 00000000
8474: 00000000
8478: 00000000
847c: 00000000
8480: 18400000
8484: 004395c9
8488: 18400000
848c: 00830000
8490: 00000000
8494: 00000000
8498: 00000000
849c: 00000000
84a0: 00000000
84a4: 00000000
84a8: 00000000
84ac: 00000000
84b0: 00000000
84b4: 00000000
84b8: 00000000
84bc: 00000000
84c0: 00000000
84c4: 00000000
84c8: 00000000
84cc: 00000000
84d0: 8c75d299
84d4: 312bcdc7
84d8: 2c9dd79c
84dc: ff0a829c
84e0: 8e25f6f9
84e4: 8c086240
84e8: 18bc0d1f
84ec: ea31faa9
84f0: 2e6d68e1
84f4: 0c158c24
84f8: 1859604e
84fc: 3f7b7e18
8500: 0a38f3f8
8504: f0a01b58
8508: d7d91d69
850c: 64bfdb29
8510: 82e8d5de
8514: 61b8da53
8518: b00873eb
851c: 68afa8e7
8520: ade70d8f
8524: d9649ccd
8528: df82d5bd
852c: d1d8acae
8530: 1f70b753
8534: deb8886a
8538: 934afbfe
853c: 3defac86
8540: efc68e38
8544: f4a40a4c
8548: 87f64de4
854c: a1381e72
8550: c5980a7a
8554: 5f2caee9
8558: d3de9222
855c: f7bbe40d
8560: 58664055
8564: 538a6046
8568: 3d129908
856c: 91994d36
8570: 4ed64484
8574: bd15e7ad
8578: fdba19b4
857c: 8235b63b
8580: feccd673
8584: df138d47
8588: 0a0de9cc
858c: 876afb93
8590: 620a33f1
8594: 388eef83
8598: 8bb6c840
859c: b2c21297
85a0: f998749c
85a4: 7d701cc5
85a8: 52c96b60
85ac: 4f1cfcb5
85b0: d754972f
85b4: 39d235ca
85b8: 739d8ddc
85bc: da647ff7
85c0: ec5f772c
85c4: a4318067
85c8: 2ab0757b
85cc: 60566514
85d0: 9adb8d1c
85d4: 0042213f
85d8: 7ba8a141
85dc: d5447b58
85e0: 0a1eb4e9
85e4: dbcc45c6
85e8: 1cc939d6
85ec: a0e17b8f
85f0: 531b1d55
85f4: a5307ae7
85f8: f75afbca
85fc: 23777b09
8600: 953915bc
8604: 9fbb9774
8608: fecc58b6
860c: d8bbd7d0
8610: 56881736
8614: 3d23f16c
8618: b2a3353d
861c: 588d66ce
8620: d6f5b747
8624: 2bfa1cd5
8628: 978fe985
862c: c435a1fa
8630: b6392b35
8634: 79b2fafc
8638: 36057c1c
863c: 0d896632
8640: 01f96c8b
8644: f2afd4e1
8648: dbd1d0ad
864c: 13e590e0
8650: 3704a06d
8654: 1627c889
8658: 23d897ba
865c: 55a693ba
8660: b014d2c3
8664: b64d4ff4
8668: 57ae08c4
866c: 49b9bb62
8670: 701b244e
8674: b661e559
8678: 47c4691c
867c: ecaca715
8680: 2dca043e
8684: 08a0c38f
8688: 41c269e2
868c: bf97cc50
8690: 3d1d86e0
8694: 0357780b
8698: 0f7ff20e
869c: 30549df3
86a0: 1a2eb1bd
86a4: 5b185d2a
86a8: 9d66b7d4
86ac: 5dbb4019
86b0: 12eba20c
86b4: 22015dca
86b8: 8f986a66
86bc: 61056d2f
86c0: 2eacf72c
86c4: 284d2165
86c8: f02ac3ef
86cc: ef7ccc0d
86d0: e2fb6b10
86d4: 23d514ae
86d8: bcadfeea
86dc: 12478c96
86e0: cc4d2fc7
86e4: c7a5ef1c
86e8: 7e4a5400
86ec: c644d1b5
86f0: 737b77ac
86f4: 78a718b4
86f8: 44473a2e
86fc: 390c05c7
8700: c671e503
8704: 3fcbae7a
8708: eed0a221
870c: 601c4fa0
8710: 5175e987
8714: 54987fb2
8718: 9af33be9
871c: 14a8cb70
8720: 3f545d45
8724: 29ca874f
8728: b265c529
872c: 019a8466
8730: dec77a4e
8734: 7d2febec
8738: 5a5b8550
873c: 26080f86
8740: 5fed17be
8744: 252e66fd
8748: 624a604c
874c: 93b7003a
8750: c37dbc5c
8754: 2807b91b
8758: 5086a75f
875c: 23ec2274
8760: 49a44524
8764: e90ad779
8768: bb839ee6
876c: 2982eca9
8770: d80ccdd8
8774: a6e35383
8778: 3bcca1f7
877c: e9e3b4ac
8780: a3ee0333
8784: c0496ead
8788: ab9a26b9
878c: 7f40fe89
8790: a65ec824
8794: 9f540bdc
8798: ecb5ad5e
879c: 73493f20
87a0: ae12acc3
87a4: 7c38958f
87a8: c4e83408
87ac: 1c7bf81f
87b0: 16036de5
87b4: 49ffd1ae
87b8: 68b78547
87bc: 851efcf8
87c0: 6e298c77
87c4: 98d1d2f1
87c8: c0a79076
87cc: d5fa6d18
87d0: 4364e767
87d4: 878665e3
87d8: ce8cb4f5
87dc: a71c2269
87e0: cd086164
87e4: 1e23a499
87e8: a516d5ea
87ec: e1a31e51
87f0: 94884202
87f4: 4451fcc7
87f8: 8c02f360
87fc: cad32d4b
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# 
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# 1b
8758: 5086a75f
875c: 23ec2274
8760: 49a44524
8764: e90ad779
8768: bb839ee6
876c: 2982eca9
8770: d80ccdd8
8774: a6e35383
8778: 3bcca1f7
877c: e9e3b4ac
8780: a3ee0333
8784: c0496ead
8788: ab9a26b9
878c: 7f40fe89
8790: a65ec824
8794: 9f540bdc
8798: ecb5ad5e
879c: 73493f20
87a0: ae12acc3
87a4: 7c38958f
87a8: c4e83408
87ac: 1c7bf81f
87b0: 16036de5
87b4: 49ffd1ae
87b8: 68b78547
87bc: 851efcf8
87c0: 6e298c77
87c4: 98d1d2f1
87c8: c0a79076
87cc: d5fa6d18
87d0: 4364e767
87d4: 878665e3
87d8: ce8cb4f5
87dc: a71c2269
87e0: cd086164
87e4: 1e23a499
87e8: a516d5ea
87ec: e1a31e51
87f0: 94884202
87f4: 4451fcc7
87f8: 8c02f360
87fc: cad32d4b
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0# 
1b
8758: 5086a75f
875c: 23ec2274
8760: 49a44524
8764: e90ad779
8768: bb839ee6
876c: 2982eca9
8770: d80ccdd8
8774: a6e35383
8778: 3bcca1f7
877c: e9e3b4ac
8780: a3ee0333
8784: c0496ead
8788: ab9a26b9
878c: 7f40fe89
8790: a65ec824
8794: 9f540bdc
8798: ecb5ad5e
879c: 73493f20
87a0: ae12acc3
87a4: 7c38958f
87a8: c4e83408
87ac: 1c7bf81f
87b0: 16036de5
root@sdr-sim:/sys/kernel/debug/regmap/spi0.0#

Can you please advise on what could be the possible reasons?

Do I need to replace the chip?

Here is the schematics of the CAN:

over 2 years ago

0 Filip Milev over 2 years ago

Prodigy 10 points

Here is the kernel log:

+1 Jonathan Nerger over 2 years ago in reply to Filip Milev

TI__Mastermind 34240 points

Hello Filip,

I can see from the register dump that the ECCERR bit is getting set, but I also see the ARA (Access to Reserved Address) bit is getting set. If these are related, then it may indicate that there is some improper SPI write/read access to a reserved or undefined space that is causing a problem.

Other potential causes for an ECC error outside are a bad device, or some sort of voltage or clock disruption that occurred during the access which resulted in corrupted bits.

I have reviewed your register dump and didn't see anything that jumped out as an obvious error or cause for this issue. I have also reviewed the schematic and it looks pretty good. I do however have some recommendations with the crystal/clock circuit.

The TCAN4550 supports both a crystal and a single-ended clock. When the device powers up, a small 1uA current is sourced out of the OSC2 pin and a comparator is used to determine if the voltage on the OSC2 pin is "grounded" or has a voltage less than 100mv (typ). If the voltage is below this threshold, the device will disable the crystal transimpedance amplifier and expect a single-ended clock signal on OSC1. If the OSC2 pin voltage is greater than this threshold, the device will enable the transimpedance amplifier and source current out of the OSC1 pin to the crystal and the device will monitor the OSC2 pin for an oscillation waveform to use as a clock.

If the OSC2 waveform peak-to-peak amplitude becomes too large, the lowest level of the waveform could cross the threshold used to check whether the OSC2 pin is "grounded." If this occurs the device could momentarily disable the amplifier and switch to single-ended mode until the waveform Vpp decays to smaller level and the device switches back to crystal mode. But during this period of time, the device does not have a working clock, and SPI, CAN, and memory access issues may occur.

From your schematic, the crystal loading caps look a bit on the small side, and there is not a series dampening resistor between OSC1 and the crystal that could be used to restrict the current flowing to the crystal and keep the amplitude from becoming too large.

Please see the TCAN455x Clock Optimization and Design Guidelines application note for more information. (Link)

I have not seen an unoptimized crystal circuit cause ECC errors, but you could try to increase the capacitor values on the crystal caps to see if there is any improvement.

I have seen an unoptimized crystal circuit cause SPI and CAN communication issues. So if you don't have any SPI errors, the ECC errors may mean the TCAN4550 device has been damaged.

Regards,

Jonathan

0 Filip Milev over 2 years ago in reply to Jonathan Nerger

Prodigy 10 points

Hi Jonathan!

Thank you for the thorough explanation and pointer to the loading caps.

After I changed the caps to 8.2 pF and changed the chip, I got it up and running fine.

For future reference:

This crystal oscillator ESR I've used is 60Ω. This puts the design on the border range of acceptable values. The low cap values + the wrong crystal has lead me to the aforementioned issue.

Thank you and kind regards!

0 Jonathan Nerger over 2 years ago in reply to Filip Milev

TI__Mastermind 34240 points

Hi Filip,

You're welcome, I'm glad I could help.

Regards,

Jonathan

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TCAN4550-Q1: nINT is constantly pulled down by ECCERR