possibly improved the rx routine

comm/iface_nordic.c

@@ -48,15 +48,18 @@ static void NrfIrqHandler(void *arg)
     LL_EXTI_ClearFlag_0_31(LL_EXTI_LINES[NRF_EXTI_LINENUM]);
     dbg_nrf("[EXTI] ---");
 
+    while (NRF_IsRxPacket()) {
         uint8_t pipenum;
         uint8_t count = NRF_ReceivePacket(rx_buffer, &pipenum);
-
         if (count > 0) {
             dbg_nrf("NRF RX %d bytes", (int) count);
             rxQuePostMsg(rx_buffer, count);
-    } else {
+        }
+        else {
             dbg("IRQ but no Rx");
         }
+    }
+
     dbg_nrf("--- end [EXTI]");
 }
 

comm/nrf.c

@@ -133,6 +133,12 @@ static uint8_t spi(uint8_t tx) {
 #define RD_CONFIG_DISABLE_IRQ_TX_DS 0x20
 #define RD_CONFIG_DISABLE_IRQ_RX_DR 0x40
 
+#define RD_FIFO_STATUS_RX_EMPTY 0x01
+#define RD_FIFO_STATUS_RX_FULL 0x02
+#define RD_FIFO_STATUS_TX_EMPTY 0x10
+#define RD_FIFO_STATUS_TX_FULL 0x20
+#define RD_FIFO_STATUS_TX_REUSE 0x40
+
 // Config register bits (excluding the bottom two that are changed dynamically)
 // enable only Rx IRQ
 #define ModeBits (RD_CONFIG_DISABLE_IRQ_MAX_RT | \
@@ -384,21 +390,29 @@ void NRF_SetChannel(uint8_t Ch)
 uint8_t NRF_ReceivePacket(uint8_t *Packet, uint8_t *PipeNum)
 {
     uint8_t pw = 0, status;
-    if (!NRF_IsRxPacket()) return 0;
+//    if (!NRF_IsRxPacket()) {
+//        dbg("rx queue empty");
+//        return 0;
+//    }
 
-    const uint8_t orig_conf = NRF_ReadRegister(RG_CONFIG);
-    CE(0); // quit Rx mode - go idle
+//    const uint8_t orig_conf = NRF_ReadRegister(RG_CONFIG);
+//    CE(0); // quit Rx mode - go idle
 
     CHIPSELECT {
         status = spi(CMD_RD_RX_PL_WIDTH);
         pw = spi(0);
     }
 
+    if (pw == 0) {
+        dbg("empty pld");
+    }
+
     if (pw > 32) {
         CHIPSELECT {
             spi(CMD_FLUSH_RX);
         }
         pw = 0;
+        dbg("over 32");
     } else {
         // Read the reception pipe number
         *PipeNum = ((status & RD_STATUS_RX_PNO) >> 1);
@@ -409,21 +423,23 @@ uint8_t NRF_ReceivePacket(uint8_t *Packet, uint8_t *PipeNum)
     }
     NRF_WriteRegister(RG_STATUS, RD_STATUS_RX_DR); // Clear the RX_DR interrupt
 
-    if ((orig_conf & RD_CONFIG_PWR_UP) == 0) {
-        dbg_nrf("going back PwrDn");
-        NRF_PowerDown();
-    }
-    else if ((orig_conf & RD_CONFIG_PRIM_RX) == RD_CONFIG_PRIM_RX) {
-        dbg_nrf("going back PwrUp+Rx");
-        NRF_ModeRX();
-    }
+//    if ((orig_conf & RD_CONFIG_PWR_UP) == 0) {
+//        dbg_nrf("going back PwrDn");
+//        NRF_PowerDown();
+//    }
+//    else if ((orig_conf & RD_CONFIG_PRIM_RX) == RD_CONFIG_PRIM_RX) {
+//        dbg_nrf("going back PwrUp+Rx");
+//        NRF_ModeRX();
+//    }
+//    CE(1); // back to rx
     return pw;
 }
 
 bool NRF_IsRxPacket(void)
 {
-    uint8_t ret = NRF_ReadRegister(RG_STATUS) & RD_STATUS_RX_DR;
-    return 0 != ret;
+    return 0 == (NRF_ReadRegister(RG_FIFO_STATUS) & RD_FIFO_STATUS_RX_EMPTY);
+//    uint8_t ret = NRF_ReadRegister(RG_STATUS) & RD_STATUS_RX_DR;
+//    return 0 != ret;
 }
 
 bool NRF_SendPacket(uint8_t PipeNum, const uint8_t *Packet, uint8_t Length)