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gex-core/comm/msg_bulkwrite.c

89 lines
2.1 KiB

//
// Created by MightyPork on 2017/12/23.
//
#include "platform.h"
#include <TinyFrame.h>
#include "messages.h"
#include "utils/payload_parser.h"
#include "utils/payload_builder.h"
/**
* TF listener for the bulk write transaction
*/
static TF_Result bulkwrite_lst(TinyFrame *tf, TF_Msg *msg)
{
BulkWrite *bulk = msg->userdata;
// this is a final call before timeout, to clean up
if (msg->data == NULL) {
goto close;
}
assert_param(NULL != bulk);
if (msg->type == MSG_BULK_ABORT) {
goto close;
}
else if (msg->type == MSG_BULK_DATA || msg->type == MSG_BULK_END) {
// if past len, say we're done and close
if (bulk->offset >= bulk->len) {
com_respond_err(bulk->frame_id, "WRITE OVERRUN");
goto close;
}
bulk->write(bulk, msg->data, msg->len);
// Return SUCCESS
com_respond_ok(msg->frame_id);
// advance the position pointer (can be used by the write callback)
bulk->offset += msg->len;
if (msg->type == MSG_BULK_END) {
// this was the last chunk
goto close;
}
}
return TF_RENEW;
close:
if (bulk) {
// Ask user to free the bulk and userdata
bulk->write(bulk, NULL, 0);
msg->userdata = NULL;
}
return TF_CLOSE;
}
/** Start the bulk write flow */
void bulkwrite_start(TinyFrame *tf, BulkWrite *bulk)
{
assert_param(bulk);
assert_param(bulk->len);
assert_param(bulk->write);
bulk->offset = 0;
{
uint8_t buf[8];
PayloadBuilder pb = pb_start(buf, 8, NULL);
pb_u32(&pb, bulk->len);
pb_u32(&pb, TF_MAX_PAYLOAD_RX);
// We use userdata1 to hold a reference to the bulk transfer
TF_Msg msg = {
.type = MSG_BULK_WRITE_OFFER,
.frame_id = bulk->frame_id,
.is_response = true, // this ensures the frame_id is not re-generated
.data = buf,
.len = (TF_LEN) pb_length(&pb),
.userdata = bulk,
};
TF_Query(tf, &msg, bulkwrite_lst, BULK_LST_TIMEOUT_MS);
}
}