Add support for nRF24L01+ radio module

Author: ogorodnik

components/src/radio/nrf24l01p/nrf24l01p.adb

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+with "../../boards/stm32f429_discovery/stm32f429_discovery_full.gpr";
+
+project nRF24L01p_F429Disco extends "../shared/common/common.gpr" is
+
+  for Runtime ("Ada") use STM32F429_Discovery_Full'Runtime("Ada");
+  for Target use "arm-eabi";
+  for Main use ("nrf24l01p_example.adb");
+  for Languages use ("Ada");
+  for Source_Dirs use ("../shared/nrf24l01p/src");
+  for Object_Dir use "../shared/nrf24l01p/obj/stm32f429disco";
+  for Create_Missing_Dirs use "True";
+
+  package Compiler renames STM32F429_Discovery_Full.Compiler;
+
+end nRF24L01p_F429Disco;

components/src/radio/nrf24l01p/nrf24l01p.ads

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+# This command file will cause a Cortex-M3 or -M4 board to automatically 
+# reset immediately after a GDB "load" command executes.  Note that GPS
+# issues that command as part of the Debug->Init menu invocation.  Manual
+# "load" command invocations will also trigger the action.
+#
+# The reset is achieved by writing to the "Application Interrupt and Reset
+# Control" register located at address 0xE000ED0C.  
+#
+# Both the processor and the peripherals can be reset by writing a value
+# of 0x05FA0004. That value will write to the SYSRESETREQ bit.  If you want
+# to avoid resetting the peripherals, change the value to 0x05FA0001.  That
+# value will write to the VECTRESET bit.  Do *not* use a value that sets both
+# bits.
+#
+# In both cases, any on-board debug hardware is not reset.
+#
+# See the book "The Definitive Guide to the ARM Cortex-M3 and Cortex-M4
+# Processors" by Joseph Yiu, 3rd edition, pp 262-263 for further details.
+
+define hookpost-load
+echo Resetting the processor and peripherals...\n
+set *0xE000ED0C := 0x05FA0004
+echo Reset complete\n
+end

examples/STM32F429_Discovery/nrf24l01p_f429disco.gpr

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+This is a simple test/example for nRF24L01+ with
+STM32F429Disco. Two nRF24L01+ should be connected
+to the following board's pins:
+  TX:
+   CE  PB7
+   CSN PE3
+     SPI4 Pins:
+   PE2  SPI4_SCK
+   PE5  SPI4_MISO
+   PE6  SPI4_MOSI
+
+  RX:
+   CE  PC11
+   CSN PC12
+   IRQ PB4
+     SPI4 Pins:
+   PE2  SPI4_SCK
+   PE5  SPI4_MISO
+   PE6  SPI4_MOSI
+
+to communicate with each other.