Added STM32F072CB varant for the Elektor LoRa Node (#1054)

* Added STM32F072CB varant for the Elektor LoRa Node

As the STM32F072C8 ( 64kB ) does not provide enough space for user applications when the LoRaWAN Stack is present, the first production run will include a STM32F072CB (128kB) with the same pinout but a bit more flash. 
The variant has been renamed to reflect this change, also a new Board has been added to the menu so you can choose what you have populated.

Signed-off-by: Mathias Claussen | Elektor Labs <mathiasc@eimworld.com>
Co-authored-by: Frederic Pillon <frederic.pillon@st.com>

Author: lab-mathias-claussen

boards.txt

@@ -1736,17 +1736,29 @@ LoRa.menu.pnum.RHF76_052.build.cmsis_lib_gcc=arm_cortexM0l_math
 LoRa.menu.pnum.RHF76_052.build.extra_flags=-D{build.product_line} {build.enable_usb} {build.xSerial} -D__CORTEX_SC=0
 
 # ELEKTOR_F072C8
-LoRa.menu.pnum.ELEKTOR_F072C8=Elektor LoRa Node Core F072
+LoRa.menu.pnum.ELEKTOR_F072C8=Elektor LoRa Node Core F072C8 (64kB)
 LoRa.menu.pnum.ELEKTOR_F072C8.upload.maximum_data_size=16384
-LoRa.menu.pnum.ELEKTOR_F072C8.upload.maximum_size=131072
+LoRa.menu.pnum.ELEKTOR_F072C8.upload.maximum_size=65536
 LoRa.menu.pnum.ELEKTOR_F072C8.build.mcu=cortex-m0
 LoRa.menu.pnum.ELEKTOR_F072C8.build.board=ELEKTOR_F072C8
 LoRa.menu.pnum.ELEKTOR_F072C8.build.series=STM32F0xx
 LoRa.menu.pnum.ELEKTOR_F072C8.build.product_line=STM32F072xB
-LoRa.menu.pnum.ELEKTOR_F072C8.build.variant=ELEKTOR_F072C8
+LoRa.menu.pnum.ELEKTOR_F072C8.build.variant=ELEKTOR_F072Cx
 LoRa.menu.pnum.ELEKTOR_F072C8.build.cmsis_lib_gcc=arm_cortexM0l_math
 LoRa.menu.pnum.ELEKTOR_F072C8.build.extra_flags=-D{build.product_line} {build.xSerial}
 
+# ELEKTOR_F072CB
+LoRa.menu.pnum.ELEKTOR_F072CB=Elektor LoRa Node Core F072CB (128kB)
+LoRa.menu.pnum.ELEKTOR_F072CB.upload.maximum_data_size=16384
+LoRa.menu.pnum.ELEKTOR_F072CB.upload.maximum_size=131072
+LoRa.menu.pnum.ELEKTOR_F072CB.build.mcu=cortex-m0
+LoRa.menu.pnum.ELEKTOR_F072CB.build.board=ELEKTOR_F072CB
+LoRa.menu.pnum.ELEKTOR_F072CB.build.series=STM32F0xx
+LoRa.menu.pnum.ELEKTOR_F072CB.build.product_line=STM32F072xB
+LoRa.menu.pnum.ELEKTOR_F072CB.build.variant=ELEKTOR_F072Cx
+LoRa.menu.pnum.ELEKTOR_F072CB.build.cmsis_lib_gcc=arm_cortexM0l_math
+LoRa.menu.pnum.ELEKTOR_F072CB.build.extra_flags=-D{build.product_line} {build.xSerial}
+
 # Upload menu
 LoRa.menu.upload_method.swdMethod=STM32CubeProgrammer (SWD)
 LoRa.menu.upload_method.swdMethod.upload.protocol=0

variants/ELEKTOR_F072C8/PeripheralPins.c variants/ELEKTOR_F072Cx/PeripheralPins.cvariants/ELEKTOR_F072C8/PeripheralPins.c renamed to variants/ELEKTOR_F072Cx/PeripheralPins.c

@@ -53,16 +53,16 @@
 ENTRY(Reset_Handler)
 
 /* Highest address of the user mode stack */
-_estack = 0x20004000;	/* end of "RAM" Ram type memory */
+_estack = 0x20000000 + LD_MAX_DATA_SIZE;	/* end of "RAM" Ram type memory */
 
 _Min_Heap_Size = 0x200 ;	/* required amount of heap  */
 _Min_Stack_Size = 0x400 ;	/* required amount of stack */
 
 /* Memories definition */
 MEMORY
 {
-    RAM	(xrw)	: ORIGIN = 0x20000000,	LENGTH = 16K
-    FLASH	(rx)	: ORIGIN = 0x8000000,	LENGTH = 64K
+    RAM	(xrw)	: ORIGIN = 0x20000000,	LENGTH = LD_MAX_DATA_SIZE
+     FLASH	(rx)	: ORIGIN = 0x8000000 + LD_FLASH_OFFSET, LENGTH = LD_MAX_SIZE - LD_FLASH_OFFSET
 }
 
 /* Sections */