nimble/ll: Add function for getting current PHY channel

This is useful for dynamic FEM drivers.

nimble/controller/include/controller/ble_phy.h

@@ -86,6 +86,7 @@ int ble_phy_init(void);
 
 /* Set the PHY channel */
 int ble_phy_setchan(uint8_t chan, uint32_t access_addr, uint32_t crcinit);
+uint8_t ble_phy_chan_get(void);
 
 #if MYNEWT_VAL(BLE_PHY_VARIABLE_TIFS)
 /* Set T_ifs time for next transition */

nimble/drivers/dialog_cmac/src/ble_phy.c

@@ -1697,6 +1697,12 @@ ble_phy_setchan(uint8_t chan, uint32_t access_addr, uint32_t crc_init)
     return 0;
 }
 
+uint8_t
+ble_phy_chan_get(void)
+{
+    return g_ble_phy_data.channel;
+}
+
 void
 ble_phy_restart_rx(void)
 {

nimble/drivers/native/src/ble_phy.c

@@ -551,6 +551,12 @@ ble_phy_setchan(uint8_t chan, uint32_t access_addr, uint32_t crcinit)
     return 0;
 }
 
+uint8_t
+ble_phy_chan_get(void)
+{
+    return g_ble_phy_data.phy_chan;
+}
+
 /**
  * Disable the PHY. This will do the following:
  *  -> Turn off all phy interrupts.

nimble/drivers/nrf51/src/ble_phy.c

@@ -1365,6 +1365,12 @@ ble_phy_setchan(uint8_t chan, uint32_t access_addr, uint32_t crcinit)
     return 0;
 }
 
+uint8_t
+ble_phy_chan_get(void)
+{
+    return g_ble_phy_data.phy_chan;
+}
+
 /**
  * Stop the timer used to count microseconds when using RTC for cputime
  */

nimble/drivers/nrf5x/src/ble_phy.c

@@ -2126,6 +2126,12 @@ ble_phy_setchan(uint8_t chan, uint32_t access_addr, uint32_t crcinit)
     return 0;
 }
 
+uint8_t
+ble_phy_chan_get(void)
+{
+    return g_ble_phy_data.phy_chan;
+}
+
 /**
  * Stop the timer used to count microseconds when using RTC for cputime
  */