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#ifndef __UDS_H__
#define __UDS_H__
#include <uds/uds_types.h>
#include <stdint.h>
#include <stdbool.h>
#define OBD2_FUNCTIONAL_BROADCAST_ID 0x7df
#define OBD2_FUNCTIONAL_RESPONSE_START 0x7e8
#define OBD2_FUNCTIONAL_RESPONSE_COUNT 8
#ifdef __cplusplus
extern "C" {
#endif
/* Public: Initialize an DiagnosticShims with the given callback functions.
*
* If any callbacks are not to be used, set them to NULL. For documentation of
* the function type signatures, see higher up in this header file. This struct
* is a handy encapsulation used to pass the shims around to the various
* diagnostic_* functions.
*
* Returns a struct with the fields initailized to the callbacks.
*/
DiagnosticShims diagnostic_init_shims(LogShim log,
SendCanMessageShim send_can_message,
SetTimerShim set_timer);
/* Public: Generate a new diagnostic request, send the first CAN message frame
* and set up the handle required to process the response via
* diagnostic_receive_can_frame(...).
*
* shims - Low-level shims required to send CAN messages, etc.
* request -
* callback - an optional function to be called when the response is receved
* (use NULL if no callback is required).
*
* Returns a handle to be used with diagnostic_receive_can_frame to complete
* sending the request and receive the response. The 'completed' field in the
* returned DiagnosticRequestHandle will be true when the message is completely
* sent. The first frame of the message will already be sent.
*/
DiagnosticRequestHandle diagnostic_request(DiagnosticShims* shims,
DiagnosticRequest* request, DiagnosticResponseReceived callback);
/* Public: Generate the handle for a new diagnostic request, but do not send any
* data to CAN yet - you must call start_diagnostic_request(...) on the handle
* returned from this function actually kick off the request.
*
* shims - Low-level shims required to send CAN messages, etc.
* request -
* callback - an optional function to be called when the response is receved
* (use NULL if no callback is required).
*
* Returns a handle to be used with start_diagnostic_request and then
* diagnostic_receive_can_frame to complete sending the request and receive the
* response. The 'completed' field in the returned DiagnosticRequestHandle will
* be true when the message is completely sent.
*/
DiagnosticRequestHandle generate_diagnostic_request(DiagnosticShims* shims,
DiagnosticRequest* request, DiagnosticResponseReceived callback);
/* Public: Send the first frame of the request to CAN for the handle, generated
* by generate_diagnostic_request.
*
* You can also call this method to re-do the request for a handle that has
* already completed.
*/
void start_diagnostic_request(DiagnosticShims* shims,
DiagnosticRequestHandle* handle);
/* Public: Request a PID from the given arbitration ID, determining the mode
* automatically based on the PID type.
*
* shims - Low-level shims required to send CAN messages, etc.
* pid_request_type - either DIAGNOSTIC_STANDARD_PID (will use mode 0x1 and 1
* byte PIDs) or DIAGNOSTIC_ENHANCED_PID (will use mode 0x22 and 2 byte
* PIDs)
* arbitration_id - The arbitration ID to send the request to.
* pid - The PID to request from the other node.
* callback - an optional function to be called when the response is receved
* (use NULL if no callback is required).
*
* Returns a handle to be used with diagnostic_receive_can_frame to complete
* sending the request and receive the response. The 'completed' field in the
* returned DiagnosticRequestHandle will be true when the message is completely
* sent.
*/
DiagnosticRequestHandle diagnostic_request_pid(DiagnosticShims* shims,
DiagnosticPidRequestType pid_request_type, uint32_t arbitration_id,
uint16_t pid, DiagnosticResponseReceived callback);
/* Public: Continue to send and receive a single diagnostic request, based on a
* freshly received CAN message.
*
* shims - Low-level shims required to send CAN messages, etc.
* handle - A DiagnosticRequestHandle previously returned by one of the
* diagnostic_request*(..) functions.
* arbitration_id - The arbitration_id of the received CAN message.
* data - The data of the received CAN message.
* size - The size of the data in the received CAN message.
*
* Returns true if the request was completed and response received, or the
* request was otherwise cancelled. Check the 'success' field of the handle to
* see if it was successful.
*/
DiagnosticResponse diagnostic_receive_can_frame(DiagnosticShims* shims,
DiagnosticRequestHandle* handle,
const uint32_t arbitration_id, const uint8_t data[],
const uint8_t size);
/* Public: Parse the entier payload of the reponse as a single integer.
*
* response - the received DiagnosticResponse.
*/
int diagnostic_payload_to_integer(const DiagnosticResponse* response);
/* Public: Render a DiagnosticResponse as a string into the given buffer.
*
* response - the response to convert to a string, for debug logging.
* destination - the target string buffer.
* destination_length - the size of the destination buffer, i.e. the max size
* for the rendered string.
*/
void diagnostic_response_to_string(const DiagnosticResponse* response,
char* destination, size_t destination_length);
/* Public: Render a DiagnosticRequest as a string into the given buffer.
*
* request - the request to convert to a string, for debug logging.
* destination - the target string buffer.
* destination_length - the size of the destination buffer, i.e. the max size
* for the rendered string.
*/
void diagnostic_request_to_string(const DiagnosticRequest* request,
char* destination, size_t destination_length);
/* Public: For many OBD-II PIDs with a numerical result, translate a diagnostic
* response payload into a meaningful number using the standard formulas.
*
* Functions pulled from http://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01
*
* Returns the translated value or 0 if the PID is not in the OBD-II standard or
* does not use a numerical value (e.g. VIN).
*/
float diagnostic_decode_obd2_pid(const DiagnosticResponse* response);
/* Public: Returns true if the "fingerprint" of the two diagnostic messages
* matches - the arbitration_id, mode and pid (or lack of pid).
*/
bool diagnostic_request_equals(const DiagnosticRequest* ours,
const DiagnosticRequest* theirs);
#ifdef __cplusplus
}
#endif
#endif // __UDS_H__
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