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lib/cansend: update documentation for CAN XL frame format

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Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
This commit is contained in:
Oliver Hartkopp
2024-02-29 09:54:47 +01:00
parent 7761d8bcf8
commit 740c0ba156
2 changed files with 49 additions and 12 deletions
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lib.h
+27 -6
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@@ -110,9 +110,10 @@ int hexstring2data(char *arg, unsigned char *data, int maxdlen);
int parse_canframe(char *cs, cu_t *cu);
/*
* Transfers a valid ASCII string describing a CAN frame into struct canfd_frame.
* Transfers a valid ASCII string describing a CAN frame into the CAN union
* containing CAN CC/FD/XL structs.
*
* CAN 2.0 frames (aka Classical CAN)
* CAN CC frames (aka Classical CAN, CAN 2.0B)
* - string layout <can_id>#{R{len}|data}{_len8_dlc}
* - {data} has 0 to 8 hex-values that can (optionally) be separated by '.'
* - {len} can take values from 0 to 8 and can be omitted if zero
@@ -125,6 +126,16 @@ int parse_canframe(char *cs, cu_t *cu);
* - {data} has 0 to 64 hex-values that can (optionally) be separated by '.'
* - return value on successful parsing: CANFD_MTU
*
* CAN XL frames
* - string layout <vcid><prio>#<flags>:<sdt>:<af>#{data}
* - <vcid> a two ASCII Hex value (00 .. FF) which defines the VCID
* - <prio> a three ASCII Hex value (000 .. 7FF) which defines the 11 bit PRIO
* - <flags> a two ASCII Hex value (00 .. FF) which defines canxl_frame.flags
* - <sdt> a two ASCII Hex value (00 .. FF) which defines canxl_frame.sdt
* - <af> a 8 digit ASCII Hex value which defines the 32 bit canxl_frame.af
* - {data} has 1 to 2048 hex-values that can (optionally) be separated by '.'
* - return value on successful parsing: CANXL_MTU
*
* Return value on detected problems: 0
*
* <can_id> can have 3 (standard frame format) or 8 (extended frame format)
@@ -155,6 +166,9 @@ int parse_canframe(char *cs, cu_t *cu);
* ^^
* CAN FD extension to handle the canfd_frame.flags content
*
* 45123#81:00:12345678#11223344.556677 -> CAN XL frame with len = 7,
* VCID = 0x45, PRIO = 0x123, flags = 0x81, sdt = 0x00, af = 0x12345678
*
* Simple facts on this compact ASCII CAN frame representation:
*
* - 3 digits: standard frame format
@@ -169,8 +183,9 @@ int sprint_canframe(char *buf , cu_t *cu, int sep);
* Creates a CAN frame hexadecimal output in compact format.
* The CAN data[] is separated by '.' when sep != 0.
*
* The type of the CAN frame (CAN CC / CAN FD) is specified by
* by the dual-use struct canfd_frame.flags element:
* A CAN XL frame is detected when CANXL_XLF is set in the struct
* cu.canxl_frame.flags. Otherwise the type of the CAN frame (CAN CC/FD)
* is specified by the dual-use struct cu.canfd_frame.flags element:
* w/o CAN FD flags (== 0) -> CAN CC frame (aka Classical CAN, CAN2.0B)
* with CAN FD flags (!= 0) -> CAN FD frame (with CANFD_[FDF/BRS/ESI])
*
@@ -182,6 +197,8 @@ int sprint_canframe(char *buf , cu_t *cu, int sep);
* 32345678#112233 -> error frame with CAN_ERR_FLAG (0x2000000) set
* 123##0112233 -> CAN FD frame standard CAN-Id = 0x123, flags = 0, len = 3
* 123##2112233 -> CAN FD frame, flags = CANFD_ESI, len = 3
* 45123#81:00:12345678#11223344.556677 -> CAN XL frame with len = 7,
* VCID = 0x45, PRIO = 0x123, flags = 0x81, sdt = 0x00, af = 0x12345678
*
*/
@@ -198,8 +215,9 @@ int sprint_long_canframe(char *buf , cu_t *cu, int view);
/*
* Creates a CAN frame hexadecimal output in user readable format.
*
* The type of the CAN frame (CAN CC / CAN FD) is specified by
* by the dual-use struct canfd_frame.flags element:
* A CAN XL frame is detected when CANXL_XLF is set in the struct
* cu.canxl_frame.flags. Otherwise the type of the CAN frame (CAN CC/FD)
* is specified by the dual-use struct cu.canfd_frame.flags element:
* w/o CAN FD flags (== 0) -> CAN CC frame (aka Classical CAN, CAN2.0B)
* with CAN FD flags (!= 0) -> CAN FD frame (with CANFD_[FDF/BRS/ESI])
*
@@ -209,10 +227,13 @@ int sprint_long_canframe(char *buf , cu_t *cu, int view);
* 321 {B} 11 22 33 44 55 66 77 88 -> Classical CAN with raw '{DLC}' value B
* 20001111 [7] C6 23 7B 32 69 98 3C ERRORFRAME -> (CAN_ERR_FLAG set)
* 12345678 [03] 11 22 33 -> CAN FD with extended CAN-Id = 0x12345678, len = 3
* 123 [0003] (45|81:00:12345678) 11 22 33 -> CAN XL frame with VCID 0x45
*
* 123 [3] 11 22 33 -> CANLIB_VIEW_INDENT_SFF == 0
* 123 [3] 11 22 33 -> CANLIB_VIEW_INDENT_SFF == set
*
* There are no binary or ASCII view modes for CAN XL and the number of displayed
* data bytes is limited to 64 to fit terminal output use-cases.
*/
int snprintf_can_error_frame(char *buf, size_t len, const struct canfd_frame *cf,