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le: sample timestamp as early as possible in DMA handler

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Mike Ryan
2018-06-19 12:34:11 -07:00
parent f411b3c781
commit c8a7fed1ad
1 changed files with 2 additions and 1 deletions
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firmware/bluetooth_rxtx/le_phy.c
+2 -1
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@@ -124,6 +124,7 @@ static void buffer_release(le_rx_t *buffer) {
void le_DMA_IRQHandler(void) {
unsigned pos;
int8_t rssi;
uint32_t timestamp = NOW; // sampled early for most accurate measurement
// channel 0
if (DMACIntStat & (1 << 0)) {
@@ -144,7 +145,7 @@ void le_DMA_IRQHandler(void) {
current_rxbuf->pos = pos;
if (pos == 1) {
current_rxbuf->timestamp = NOW - USEC(8 + 32); // packet starts at preamble
current_rxbuf->timestamp = timestamp - USEC(8 + 32); // packet starts at preamble
current_rxbuf->channel = rf_channel;
current_rxbuf->access_address = le.access_address;
}