diff --git a/lib/maca.c b/lib/maca.c
index 38fe0ce4e..341d12b97 100644
--- a/lib/maca.c
+++ b/lib/maca.c
@@ -166,7 +166,7 @@ void post_tx(void) {
 	disable_irq(MACA);
 	last_post = TX_POST;
 	dma_tx = tx_head; 	
-	*MACA_TXLEN = (uint32_t)(dma_tx->length + 2);
+	*MACA_TXLEN = (uint32_t)((dma_tx->length) + 2);
 	*MACA_DMATX = (uint32_t)&(dma_tx->data[0]);
 	if(dma_rx == 0) {
 		dma_rx = get_free_packet();
@@ -183,17 +183,18 @@ void post_tx(void) {
 	/* enable complete clock */
 	*MACA_TMREN = (1 << maca_tmren_cpl);
 	/* do the transmit */
+	for(i=0; i<1000; i++) { continue; }
 	enable_irq(MACA);
 /*	*MACA_CONTROL = ( (1 << maca_ctrl_prm) | ( 4 << PRECOUNT) |
 			  (maca_ctrl_mode_no_cca << maca_ctrl_mode) |
 			  (1 << maca_ctrl_asap) |
 			  (maca_ctrl_seq_tx));	*/
+//	for(i=0; i<1000; i++) { continue; }
 	*MACA_CONTROL = ( (1 << maca_ctrl_prm) |
 			  (maca_ctrl_mode_no_cca << maca_ctrl_mode) |
 			  (1 << maca_ctrl_asap) |
 			  (maca_ctrl_seq_tx));	
-
-	for(i=0; i<10; i++) { continue; }
+	for(i=0; i<1000; i++) { continue; }
 }
 
 void tx_packet(volatile packet_t *p) {
diff --git a/tests/per.c b/tests/per.c
index ac7f562d4..d34ea84f1 100644
--- a/tests/per.c
+++ b/tests/per.c
@@ -47,11 +47,11 @@ uint32_t get_time(void) {
 #define random_short_addr() (*MACA_RANDOM & ones(sizeof(short_addr_t)*8))
 
 void build_session_req(volatile packet_t *p) {
-	p->length = 16;
-	p->data[0] = 0xff;
-	p->data[1] = 0x01;
-	p->data[2] = 0x23;
-	p->data[3] = 0x45;
+	p->length = 4;
+	p->data[0] = 0x01;
+	p->data[1] = 0x02;
+	p->data[2] = 0x03;
+	p->data[3] = 0x04;
 	return;
 }
 
@@ -149,7 +149,7 @@ void main(void) {
 					sesid = open_session(p->addr);
 				}
 			}  else {
-				//		session_req(my_addr);
+				session_req(my_addr);
 			}
 			break;
 		default: