UM0459 datasheet(25/29 Pages) STMICROELECTRONICS

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UM0459

Controller area network (CAN) routines

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2.2.21

CAN_GetMsgTransmiRequestStatus

Example:

This example illustrates how to test the transmit request.

{

/*Send a message using object 0*/

CAN_SendMessage(CAN1, 0, &CanMsg);

/*Wait for the end of transmit request*/

while (CAN_GetMsgTransmitRequestStatus(CAN1, 0));

/*Now, the message is being processed by the priority handler of the CAN cell, and

ready to be emitted on the bus*/

}

2.2.22

CAN_GetMsgInterruptStatus function

Example:

This example illustrates how to test interrupt pending.

{

/*Send a message using object 0*/

CAN_SendMessage(CAN1, 0, &CanMsg)

/* Wait for the TX interrupt*/

Table 25.

CAN_GetMsgTransmitRequestStatus function description

Function name

CAN_GetMsgTransmitRequestStatus

Prototype

FlagStatus CAN_GetMsgTransmitRequestStatus(CAN_TypeDef* CAN,

u16 msgobj);

Behavior description

Tests the request status of a transmitted message. It reads the

corresponding bit in the Transmission Request 1 or 2 registers.

Input parameter1

CAN: pointer to a CAN_TypeDef structure.

Input parameter2

msgobj: message object number, from 0 to 31.

Output parameter

None

Return value

1 if transmission of the corresponding message was requested, else 0.

Required preconditions

A message must have been sent before.

Called functions

None

Table 26.

CAN_GetMsgInterruptStatus function description

Function name

CAN_GetMsgInterruptStatus

Prototype

FlagStatus CAN_GetMsgInterruptStatus(CAN_TypeDef* CAN, u16 msgobj);

Behavior description

Tests the interrupt status of a message object. It reads the corresponding

bit in the Interrupt Pending 1 or 2 registers.

Input parameter1

CAN: pointer to a CAN1 or CAN2 CAN_TypeDef structure.

Input parameter2

msgobj: message object number, from 0 to 31.

Output parameter

None

Return value

1 if the corresponding message has an interrupt pending, else 0.

Required preconditions The interrupts must have been enabled.

Called functions

None

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