NRF5: Add nrf52805 support (#1461)

* Exclude cache for NRF52805
* Check and handle unsupported modulation rates
* Make PPI channel selection dynamic, based chip specific channel count

Author: nikolac

MyConfig.h

@@ -543,7 +543,11 @@
  * - NRF5_BLE_1MBPS for 1Mbps BLE modulation
  */
 #ifndef MY_NRF5_ESB_MODE
+#ifdef NRF5_250KBPS
 #define MY_NRF5_ESB_MODE (NRF5_250KBPS)
+#else
+#define MY_NRF5_ESB_MODE (NRF5_1MBPS)
+#endif
 #endif
 
 /**

hal/architecture/NRF5/MyHwNRF5.cpp

@@ -99,7 +99,7 @@ bool hwInit(void)
 	NRF_POWER->TASKS_CONSTLAT = 1;
 
 	// Enable cache on >= NRF52
-#ifndef NRF51
+#if !defined(NRF51) && !defined(NRF52805_XXAA)
 	NRF_NVMC->ICACHECNF = NVMC_ICACHECNF_CACHEEN_Msk;
 #endif
 

hal/transport/NRF5_ESB/driver/Radio.h

@@ -65,7 +65,9 @@ typedef enum {
 typedef enum {
 	NRF5_1MBPS = RADIO_MODE_MODE_Nrf_1Mbit,
 	NRF5_2MBPS = RADIO_MODE_MODE_Nrf_2Mbit,
+#ifdef RADIO_MODE_MODE_Nrf_250Kbit
 	NRF5_250KBPS = RADIO_MODE_MODE_Nrf_250Kbit, // Deprecated!!!
+#endif
 	NRF5_BLE_1MBPS = RADIO_MODE_MODE_Ble_1Mbit,
 } nrf5_mode_e;
 

hal/transport/NRF5_ESB/driver/Radio_ESB.cpp

@@ -551,9 +551,12 @@ static inline uint8_t NRF5_ESB_byte_time()
 		return (3);
 	} else if (MY_NRF5_ESB_MODE == NRF5_2MBPS) {
 		return (2);
-	} else if (MY_NRF5_ESB_MODE == NRF5_250KBPS) {
+	}
+#ifdef NRF5_250KBPS
+	else if (MY_NRF5_ESB_MODE == NRF5_250KBPS) {
 		return (5);
 	}
+#endif
 }
 
 extern "C" {

hal/transport/NRF5_ESB/driver/Radio_ESB.h

@@ -103,15 +103,19 @@
 	 RADIO_SHORTS_READY_START_Msk |           \
 	 RADIO_SHORTS_ADDRESS_RSSISTART_Msk | RADIO_SHORTS_DISABLED_RSSISTOP_Msk)
 
-// PPI Channels for TX
+/** PPI Channels for TX
+ * Not all NRF5 modules have the same number of PPI channels
+ * For regular PPI, select the highest possible channels
+ */
+#define NRF5_ESB_PPI_LAST_CHANNEL (PPI_CH_NUM - 1)
 #if (NRF5_RADIO_TIMER_IRQN != TIMER0_IRQn)
 // Use two regular PPI channels
-#define NRF5_ESB_PPI_TIMER_START 14
-#define NRF5_ESB_PPI_TIMER_RADIO_DISABLE 15
+#define NRF5_ESB_PPI_TIMER_START (NRF5_ESB_PPI_LAST_CHANNEL - 1)
+#define NRF5_ESB_PPI_TIMER_RADIO_DISABLE (NRF5_ESB_PPI_LAST_CHANNEL)
 #else
 // Use one regular PPI channel and one predefined PPI channel
 #define NRF5_ESB_USE_PREDEFINED_PPI
-#define NRF5_ESB_PPI_TIMER_START 15
+#define NRF5_ESB_PPI_TIMER_START (NRF5_ESB_PPI_LAST_CHANNEL)
 #define NRF5_ESB_PPI_TIMER_RADIO_DISABLE 22
 #endif
 #define NRF5_ESB_PPI_BITS                                                     \