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Add new function to send a user data packet from master to slave

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This commit is contained in:
Stefan Wahren 2013-10-13 14:52:45 +02:00
parent d5f06ec910
commit 9e23818152
2 changed files with 63 additions and 0 deletions
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51
mbus/mbus-protocol-aux.c
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@ -1811,6 +1811,57 @@ mbus_send_request_frame(mbus_handle * handle, int address)
return retval;
}
//------------------------------------------------------------------------------
// send a user data packet from master to slave
//------------------------------------------------------------------------------
int
mbus_send_user_data_frame(mbus_handle * handle, int address, const unsigned char *data, size_t data_size)
{
int retval = 0;
mbus_frame *frame;
if (mbus_is_primary_address(address) == 0)
{
MBUS_ERROR("%s: invalid address %d\n", __PRETTY_FUNCTION__, address);
return -1;
}
if (data == NULL)
{
MBUS_ERROR("%s: Invalid data\n", __PRETTY_FUNCTION__);
return -1;
}
if ((data_size > MBUS_FRAME_DATA_LENGTH) || (data_size == 0))
{
MBUS_ERROR("%s: illegal data_size %d\n", __PRETTY_FUNCTION__, data_size);
return -1;
}
frame = mbus_frame_new(MBUS_FRAME_TYPE_LONG);
if (frame == NULL)
{
MBUS_ERROR("%s: failed to allocate mbus frame.\n", __PRETTY_FUNCTION__);
return -1;
}
frame->control = MBUS_CONTROL_MASK_SND_UD | MBUS_CONTROL_MASK_DIR_M2S;
frame->address = address;
frame->control_information = MBUS_CONTROL_INFO_DATA_SEND;
frame->data_size = data_size;
memcpy(frame->data, data, data_size);
if (mbus_send_frame(handle, frame) == -1)
{
MBUS_ERROR("%s: failed to send mbus frame.\n", __PRETTY_FUNCTION__);
retval = -1;
}
mbus_frame_free(frame);
return retval;
}
//------------------------------------------------------------------------------
// send a request from master to slave and collect the reply (replies)
// from the slave.

12
mbus/mbus-protocol-aux.h
View File

@ -287,6 +287,18 @@ int mbus_send_switch_baudrate_frame(mbus_handle * handle, int address, long baud
*/
int mbus_send_request_frame(mbus_handle * handle, int address);
/**
* Sends user data frame (SND_UD) to given slave using "unified" handle
*
* @param handle Initialized handle
* @param address Address (0-255)
* @param data User data
* @param data_size Byte count of user data
*
* @return Zero when successful.
*/
int mbus_send_user_data_frame(mbus_handle * handle, int address, const unsigned char *data, size_t data_size);
/**
* Sends a request and read replies until no more records available
* or limit is reached.