gex zero support, also nrf remapping based on platform and optional disable

platform/debug_uart.c

@@ -13,7 +13,7 @@
 
 #define DEBUG_USART_BAUD 115200
 
-#if GEX_PLAT_F072_DISCOVERY || GEX_PLAT_F072_HUB
+#if GEX_PLAT_F072_DISCOVERY || GEX_PLAT_F072_HUB || GEX_PLAT_F072_ZERO
 
     #define DEBUG_USART USART1
     #define DEBUG_USART_RSC R_USART1

platform/irq_dispatcher.c

@@ -246,7 +246,12 @@ void* irqd_detach(void *periph, IrqCallback callback)
 
         return oldArg;
     } else {
-        trap("Detach IRQ %p() from %p but %p() bound instead", callback, periph, slot->callback);
+        // catch bugs, but ignore an attempt to unbind when not bound
+        if (slot->callback != NULL) {
+            trap("Detach IRQ %p() from %p but %p() bound instead", callback, periph, slot->callback);
+        } else {
+            return NULL; // the arg - none
+        }
     }
 }
 

platform/plat_compat.h

@@ -72,6 +72,8 @@
 // PLAT_NO_AFNUM - legacy platform without numbered AF alternatives
 // PLAT_FULL_XTAL - use two-wire xtal attachment
 
+// SUPPORT_NRF
+
 #if defined(GEX_PLAT_F103_BLUEPILL)
 
     // platform name for the version string
@@ -189,6 +191,23 @@
         // Status LED config
         #define STATUS_LED_PORT 'A'
         #define STATUS_LED_PIN  15 // RED LED "UP"
+    #elif defined(GEX_PLAT_F072_ZERO)
+        // platform name for the version string
+        #define GEX_PLATFORM "STM32F072-ZERO"
+
+        #define PLAT_FULL_XTAL 1
+
+        // Lock jumper config
+        #define LOCK_JUMPER_PORT 'D'
+        #define LOCK_JUMPER_PIN  2
+        #define PLAT_LOCK_BTN 1 // toggle button instead of a jumper
+        #define PLAT_LOCK_1CLOSED 1 // toggle button active in log. 1
+
+        // Status LED config
+        #define STATUS_LED_PORT 'A'
+        #define STATUS_LED_PIN  15 // RED LED "UP"
+
+        #define SUPPORT_NRF 1
     #else
         #error Bad platform
     #endif

platform/platform.c

@@ -27,9 +27,11 @@
 
 void plat_init_resources(void)
 {
+    // we use |= here, even though return values are not booleans - success is 0,
+    // thus any problem results in nonzero and the assert will trip.
     uint32_t rv = 0;
 
-    // enable clock for units we use
+    // periphs available everywhere - enable clock
     hw_periph_clock_enable(DMA1);
 #ifdef DMA2
     hw_periph_clock_enable(DMA2);
@@ -142,6 +144,12 @@ void plat_init_resources(void)
         // USB
         rv |= rsc_claim(&UNIT_SYSTEM, R_PA11);
         rv |= rsc_claim(&UNIT_SYSTEM, R_PA12);
+
+        #if defined(GEX_PLAT_F072_ZERO)
+            // unconnected pins
+            rv |= rsc_claim_range(&UNIT_PLATFORM, R_PC0, R_PC1);
+            rv |= rsc_claim_range(&UNIT_PLATFORM, R_PC4, R_PC9);
+        #endif
     }
 #elif defined(GEX_PLAT_F303_DISCOVERY)
     // Platform STM32F303VCT