8000 Add 'bare-arm' port: the bare minimum to get it running on an ARM MCU. · davidgiven/micropython@c557215 · GitHub
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Add 'bare-arm' port: the bare minimum to get it running on an ARM MCU.
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‎bare-arm/Makefile

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include ../py/mkenv.mk
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# qstr definitions (must come before including py.mk)
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QSTR_DEFS = qstrdefsport.h
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# include py core make definitions
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include ../py/py.mk
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CROSS_COMPILE = arm-none-eabi-
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CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mabi=aapcs-linux -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant -Wdouble-promotion
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CFLAGS = -I. -I$(PY_SRC) -Wall -Werror -ansi -std=gnu99 $(CFLAGS_CORTEX_M4) $(COPT)
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#Debugging/Optimization
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ifeq ($(DEBUG), 1)
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CFLAGS += -O0 -ggdb
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else
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CFLAGS += -Os -DNDEBUG
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endif
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LDFLAGS = --nostdlib -T stm32f405.ld
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LIBS =
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SRC_C = \
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main.c \
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# printf.c \
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string0.c \
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malloc0.c \
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gccollect.c \
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SRC_S = \
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# startup_stm32f40xx.s \
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gchelper.s \
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OBJ = $(PY_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o) $(SRC_S:.s=.o))
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all: $(BUILD)/flash.elf
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$(BUILD)/flash.elf: $(OBJ)
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$(ECHO) "LINK $@"
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$(Q)$(LD) $(LDFLAGS) -o $@ $(OBJ) $(LIBS)
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$(Q)$(SIZE) $@
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include ../py/mkrules.mk

‎bare-arm/main.c

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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "lexer.h"
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#include "parse.h"
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#include "obj.h"
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#include "parsehelper.h"
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#include "compile.h"
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#include "runtime0.h"
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#include "runtime.h"
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#include "repl.h"
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void do_str(const char *src) {
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mp_lexer_t *lex = mp_lexer_new_from_str_len(MP_QSTR__lt_stdin_gt_, src, strlen(src), 0);
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if (lex == NULL) {
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return;
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}
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mp_parse_error_kind_t parse_error_kind;
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mp_parse_node_t pn = mp_parse(lex, MP_PARSE_SINGLE_INPUT, &parse_error_kind);
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if (pn == MP_PARSE_NODE_NULL) {
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// parse error
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mp_parse_show_exception(lex, parse_error_kind);
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mp_lexer_free(lex);
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return;
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}
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// parse okay
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qstr source_name = mp_lexer_source_name(lex);
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mp_lexer_free(lex);
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mp_obj_t module_fun = mp_compile(pn, source_name, MP_EMIT_OPT_NONE, true);
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mp_parse_node_free(pn);
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if (module_fun == mp_const_none) {
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// compile error
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return;
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}
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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mp_call_function_0(module_fun);
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nlr_pop();
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} else {
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// uncaught exception
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mp_obj_print_exception((mp_obj_t)nlr.ret_val);
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}
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}
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int main(int argc, char **argv) {
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qstr_init();
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mp_init();
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do_str("print('hello world!', list(x+1 for x in range(10)), end='eol\n')");
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mp_deinit();
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return 0;
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}
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void gc_collect(void) {
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}
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mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
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return NULL;
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}
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mp_import_stat_t mp_import_stat(const char *path) {
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return MP_IMPORT_STAT_NO_EXIST;
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}
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mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args) {
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_open_obj, 1, 2, mp_builtin_open);
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void nlr_jump_fail(void *val) {
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}
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/*
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int _lseek() {return 0;}
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int _read() {return 0;}
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int _write() {return 0;}
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int _close() {return 0;}
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void _exit(int x) {for(;;){}}
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int _sbrk() {return 0;}
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int _kill() {return 0;}
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int _getpid() {return 0;}
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int _fstat() {return 0;}
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int _isatty() {return 0;}
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*/
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void *malloc(size_t n) {return NULL;}
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void *calloc(size_t nmemb, size_t size) {return NULL;}
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void *realloc(void *ptr, size_t size) {return NULL;}
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void free(void *p) {}
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int printf(const char *m, ...) {return 0;}
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void *memcpy(void *dest, const void *src, size_t n) {return NULL;}
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int memcmp(const void *s1, const void *s2, size_t n) {return 0;}
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void *memmove(void *dest, const void *src, size_t n) {return NULL;}
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void *memset(void *s, int c, size_t n) {return NULL;}
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int strcmp(const char *s1, const char* s2) {return 0;}
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int strncmp(const char *s1, const char* s2, size_t n) {return 0;}
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size_t strlen(const char *s) {return 0;}
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char *strcat(char *dest, const char *src) {return NULL;}
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char *strchr(const char *dest, int c) {return NULL;}
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#include <stdarg.h>
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int vprintf(const char *format, va_list ap) {return 0;}
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int vsnprintf(char *str, size_t size, const char *format, va_list ap) {return 0;}
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#undef putchar
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int putchar(int c) {return 0;}
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int puts(const char *s) {return 0;}
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void _start(void) {main(0, NULL);}

‎bare-arm/mpconfigport.h

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#include <stdint.h>
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// options to control how Micro Python is built
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#define MICROPY_EMIT_X64 (0)
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#define MICROPY_EMIT_THUMB (0)
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#define MICROPY_EMIT_INLINE_THUMB (0)
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#define MICROPY_MEM_STATS (0)
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#define MICROPY_DEBUG_PRINTERS (0)
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#define MICROPY_ENABLE_GC (0)
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#define MICROPY_ENABLE_REPL_HELPERS (0)
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#define MICROPY_ENABLE_LEXER_UNIX (0)
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#define MICROPY_ENABLE_SOURCE_LINE (0)
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#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_NONE)
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#define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_NONE)
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#define MICROPY_PATH_MAX (512)
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// type definitions for the specific machine
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#define BYTES_PER_WORD (4)
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#define UINT_FMT "%lu"
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#define INT_FMT "%ld"
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typedef int32_t machine_int_t; // must be pointer size
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typedef uint32_t machine_uint_t; // must be pointer size
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typedef void *machine_ptr_t; // must be of pointer size
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typedef const void *machine_const_ptr_t; // must be of pointer size
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// extra built in names to add to the global namespace
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extern const struct _mp_obj_fun_native_t mp_builtin_open_obj;
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#define MICROPY_EXTRA_BUILTINS \
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{ MP_OBJ_NEW_QSTR(MP_QSTR_open), (mp_obj_t)&mp_builtin_open_obj },
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‎bare-arm/qstrdefsport.h

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// qstrs specific to this port

‎bare-arm/stm32f405.ld

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/*
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GNU linker script for STM32F405
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*/
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/* Specify the memory areas */
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MEMORY
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{
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FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 0x100000 /* entire flash, 1 MiB */
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FLASH_ISR (rx) : ORIGIN = 0x08000000, LENGTH = 0x004000 /* sector 0, 16 KiB */
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FLASH_TEXT (rx) : ORIGIN = 0x08020000, LENGTH = 0x080000 /* sectors 5,6,7,8, 4*128KiB = 512 KiB (could increase it more) */
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CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 0x010000 /* 64 KiB */
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RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 0x020000 /* 128 KiB */
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}
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/* top end of the stack */
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_estack = ORIGIN(RAM) + LENGTH(RAM);
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/* RAM extents for the garbage collector */
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_ram_end = ORIGIN(RAM) + LENGTH(RAM);
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_heap_end = 0x2001c000; /* tunable */
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/* define output sections */
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SECTIONS
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{
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/* The startup code goes first into FLASH */
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.isr_vector :
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{
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. = ALIGN(4);
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KEEP(*(.isr_vector)) /* Startup code */
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. = ALIGN(4);
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} >FLASH_ISR
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/* The program code and other data goes into FLASH */
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.text :
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{
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. = ALIGN(4);
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*(.text) /* .text sections (code) */
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*(.text*) /* .text* sections (code) */
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*(.rodata) /* .rodata sections (constants, strings, etc.) */
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*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
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/* *(.glue_7) */ /* glue arm to thumb code */
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/* *(.glue_7t) */ /* glue thumb to arm code */
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. = ALIGN(4);
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_etext = .; /* define a global symbol at end of code */
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_sidata = _etext; /* This is used by the startup in order to initialize the .data secion */
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} >FLASH_TEXT
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/*
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.ARM.extab :
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{
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*(.ARM.extab* .gnu.linkonce.armextab.*)
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} >FLASH
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.ARM :
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{
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__exidx_start = .;
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*(.ARM.exidx*)
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__exidx_end = .;
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} >FLASH
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*/
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/* This is the initialized data section
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The program executes knowing that the data is in the RAM
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but the loader puts the initial values in the FLASH (inidata).
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It is one task of the startup to copy the initial values from FLASH to RAM. */
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.data : AT ( _sidata )
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{
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. = ALIGN(4);
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_sdata = .; /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
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_ram_start = .; /* create a global symbol at ram start for garbage collector */
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*(.data) /* .data sections */
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*(.data*) /* .data* sections */
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. = ALIGN(4);
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_edata = .; /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
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} >RAM
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/* Uninitialized data section */
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.bss :
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{
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. = ALIGN(4);
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_sbss = .; /* define a global symbol at bss start; used by startup code */
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*(.bss)
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*(.bss*)
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*(COMMON)
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. = ALIGN(4);
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_ebss = .; /* define a global symbol at bss end; used by startup code */
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} >RAM
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/* this is to define the start of the heap, and make sure we have a minimum size */
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.heap :
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{
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. = ALIGN(4);
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_heap_start = .; /* define a global symbol at heap start */
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} >RAM
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/* this just checks there is enough RAM for the stack */
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.stack :
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{
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. = ALIGN(4);
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} >RAM
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/* Remove information from the standard libraries */
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/*
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/DISCARD/ :
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{
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libc.a ( * )
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libm.a ( * )
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libgcc.a ( * )
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}
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*/
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.ARM.attributes 0 : { *(.ARM.attributes) }
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}

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