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Only insert an ack packet if the ack request bit is set

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Mariano Alvira 2011-06-01 13:46:38 -04:00
parent 5636b019b3
commit 33b32c61e9
1 changed files with 17 additions and 2 deletions
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19
cpu/mc1322x/lib/maca.c
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@ -76,6 +76,10 @@
#define MACA_INSERT_ACK 1
#endif
/* Bit in first byte of 802.15.4 message that indicates an */
/* acknowledgereply frame is expected */
#define MAC_ACK_REQUEST_FLAG 0x20
#define reg(x) (*(volatile uint32_t *)(x))
int count_packets(void);
@ -650,7 +654,7 @@ void maca_isr(void) {
dma_rx->rx_time = *MACA_TIMESTAMP;
/* check if received packet needs an ack */
if(prm_mode == AUTOACK && (dma_rx->data[1] & 0x20)) {
if(prm_mode == AUTOACK && (dma_rx->data[1] & MAC_ACK_REQUEST_FLAG)) {
/* this wait is necessary to auto-ack */
volatile uint32_t wait_clk;
wait_clk = *MACA_CLK + 200;
@ -682,8 +686,18 @@ void maca_isr(void) {
/* PRINTF("maca action complete %d\n\r", get_field(*MACA_CONTROL,SEQUENCE)); */
if(last_post == TX_POST) {
tx_head->status = get_field(*MACA_STATUS,CODE);
#if MACA_INSERT_ACK
if(tx_head->status == SUCCESS) {
/* Having sent a message with the acknowledge request flag set the
* MACA hardware will only give a tx success indication if the message
* was acknowledged by the remote node. We need to detect this
* condition and inject an ACK packet into the internal receive stream
* as the higher layers are expecting to see an ACK packet.*/
if(tx_head->status == SUCCESS && (tx_head->data[0] & MAC_ACK_REQUEST_FLAG)) {
/* Create the dummy ack packet */
static volatile packet_t *ack_p;
if(ack_p = get_free_packet()) {
ack_p->length = 3;
@ -694,6 +708,7 @@ void maca_isr(void) {
ack_p->data[3] = *MACA_TXSEQNR;
insert_at_rx_head(ack_p);
}
}
#endif