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emdr1986x-std-per-lib

Milandr MCU 1986x Standard Peripherals Library

This isn't official library that compatible with GCC compiler.

The following MCU's are now supported by gcc:

  • MDR1901VC1T (not tested)
  • MDR1986VE1T
  • MDR1986VE3 (not tested)
  • MDR1986BE4 (not tested)
  • MDR1986VE9x

>>>Link to documentation<<<

>>>Link to a recomended GCC compiler version<<<

>>>Link to newest CMSIS<<< (The current package contain an old version of CMSIS)

To see examples for using gcc toolchain look at /usr/share/gcc-arm-embedded/samples (on Linux).

Usage (pseudocode)

INC = inc
      std-per-lib/CMSIS/CM3/CoreSupport
      std-per-lib/CMSIS/CM3/DeviceSupport/MDR32F9Qx/inc
      std-per-lib/CMSIS/CM3/DeviceSupport/MDR32F9Qx/startup
      std-per-lib/MDR32F9Qx_StdPeriph_Driver/inc
      std-per-lib/MDR32F9Qx_StdPeriph_Driver/inc/USB_Library

SRC = example.c
      std-per-lib/CMSIS/CM3/DeviceSupport/MDR32F9Qx/startup/gcc/startup_MDR32F9Qx.S
      std-per-lib/CMSIS/CM3/DeviceSupport/MDR32F9Qx/startup/system_MDR32F9Qx.c
      std-per-lib/MDR32F9Qx_StdPeriph_Driver/src/MDR32F9Qx_port.c
      # another peripheral modules

Release

CFLAGS = -mcpu=cortex-m3 -mthumb -O2 -ffunction-sections -fdata-sections -Wall -Wextra -Wshadow -Wredundant-decls -Wno-missing-field-initializers -Wconversion -Wno-packed-bitfield-compat -pipe
C

For each src in SRC list call:

arm-none-eabi-gcc ${CFLAGS} -DUSE_MDR1986VE9x -D__STARTUP_CLEAR_BSS -D__START=main -I${INC} -c ${src} -o ${src}.o

Link (OBJ it is a list of all ${src}.o):

arm-none-eabi-gcc ${CFLAGS} -T std-per-lib/CMSIS/CM3/DeviceSupport/MDR32F9Qx/startup/gcc/MDR32F9Qx.ld --specs=nosys.specs -Wl,--gc-sections -ffreestanding -nostartfiles -Wl,-Map=example.map ${OBJ} -o example.elf
C++

For each src in SRC call:

arm-none-eabi-g++ ${CFLAGS} -fno-rtti -fno-exceptions -fno-threadsafe-statics -DUSE_MDR1986VE9x -D__STARTUP_CLEAR_BSS -I${INC} -c ${src} -o ${src}.o

Link:

arm-none-eabi-g++ ${CFLAGS} -T std-per-lib/CMSIS/CM3/DeviceSupport/MDR32F9Qx/startup/gcc/MDR32F9Qx.ld --specs=nosys.specs --specs=nano.specs -Wl,--gc-sections -ffreestanding  -Wl,-Map=example.map ${OBJ} -o example.elf

Selection a type of C/C++ standard library:

--specs=nano.specs - use newlib-nano library (recomended for embedded systems). Without this flag - used the common library.

With semihosting: --specs=rdimon.specs

Without semihosting: --specs=nosys.specs

>>>What is semihosting?<<<

Show compiled file sections size after building (additional linker flag): -Wl,--print-memory-usage.

Example:

Memory region         Used Size  Region Size  %age Used
           FLASH:     29760 B       128 KB     22.71%
           RAM:        2312 B        32 KB      7.06%

Get a hex file:

arm-none-eabi-objcopy -O ihex example.elf example.hex

Get a bin file:

arm-none-eabi-objcopy -O binary example.elf example.bin

Debug

Instead cflag -O2 set -O0 -ggdb3.

Select MCU architecture

Instead cflag -mcpu=cortex-m3 use:

-mcpu=cortex-m0     # MDR1986BE4
-mcpu=cortex-m1     # MDR1986VE1T, MDR1986VE3
-mcpu=cortex-m3     # MDR1986VE9x, MDR1901VC1T

Instead compiler definition -DUSE_MDR1986VE9x use:

-DUSE_MDR1901VC1T   # MDR1901VC1T
-DUSE_MDR1986VE1T   # MDR1986VE1T
-DUSE_MDR1986VE3    # MDR1986VE3
-DUSE_MDR1986BE4    # MDR1986BE4
-DUSE_MDR1986VE9x   # MDR1986VE9x

INC, SRC and ld script change in accordance selected MCU.

Comment for pseudocode

  • instead ${VAR} paste relevant VAR list