8000 zephyr: Initial Zephyr RTOS port, MicroPython part. · cpforbes/circuitpython@cff9f02 · GitHub
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zephyr: Initial Zephyr RTOS port, MicroPython part.
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‎zephyr/Makefile

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#
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# This is main Makefile, which uses MicroPython build system, but
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# Zephyr arch-specific toolchain (setup by Zephyr's Makefile.toolchain.*).
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# Unfortunately, it's currently not possible to get target (as in: specific
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# board to run on) specific compile-time options from Zephyr, so these must
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# be set (duplicated) in this Makefile. Currently, these configured for
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# ARM Cortex-M3. This Makefile builds MicroPython as a library, and then
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# calls recursively Makefile.zephyr to build complete application using
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# Zephyr build system.
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#
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ARCH ?= x86
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BOARD ?= qemu_x86
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# Zephyr 1.5.0
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#OUTDIR_PREFIX =
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# Zephyr 1.6.0
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OUTDIR_PREFIX = $(BOARD)
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# Zephyr toolchain config is 2-pass, so included twice
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include $(ZEPHYR_BASE)/scripts/Makefile.toolchain.$(ZEPHYR_GCC_VARIANT)
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include $(ZEPHYR_BASE)/scripts/Makefile.toolchain.$(ZEPHYR_GCC_VARIANT)
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CFLAGS_arm = -mthumb -mcpu=cortex-m3 -mabi=aapcs
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CFLAGS_x86 = -fno-asynchronous-unwind-tables -ffreestanding -fno-stack-protector \
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-fno-omit-frame-pointer -mpreferred-stack-boundary=2 -mno-sse -march=pentium
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CFLAGS_TARGET = $(CFLAGS_$(ARCH))
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include ../py/mkenv.mk
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include ../py/py.mk
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INC += -I.
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INC += -I..
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INC += -I$(BUILD)
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INC += -I$(ZEPHYR_BASE)/include -I$(ZEPHYR_BASE) \
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-Ioutdir/$(OUTDIR_PREFIX)/misc/generated/sysgen \
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-I$(dir $(Z_AUTOCONF_H))
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SRC_C = main.c \
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uart_core.c \
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lib/utils/stdout_helpers.c \
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lib/utils/printf.c \
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lib/utils/pyexec.c \
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lib/mp-readline/readline.c \
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$(SRC_MOD)
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OBJ = $(PY_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
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COPT = -Os -DNDEBUG -fdata-sections -ffunction-sections
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CFLAGS = -std=gnu99 $(TOOLCHAIN_CFLAGS) $(INC) $(CFLAGS_MOD) $(COPT) $(CFLAGS_TARGET)
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include ../py/mkrules.mk
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all: $(LIBMICROPYTHON)
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$(MAKE) -f Makefile.zephyr BOARD=$(BOARD)
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qemu: all
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$(MAKE) -f Makefile.zephyr qemu BOARD=$(BOARD)
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Z_AUTOCONF_H = outdir/$(OUTDIR_PREFIX)/include/generated/autoconf.h
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$(LIBMICROPYTHON): $(Z_AUTOCONF_H)
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build/genhdr/qstr.i.last: $(Z_AUTOCONF_H)
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$(Z_AUTOCONF_H):
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rm -f $(LIBMICROPYTHON)
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-$(MAKE) -f Makefile.zephyr BOARD=$(BOARD)
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# Clean Zephyr things too
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CLEAN_EXTRA = outdir

‎zephyr/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 "py/nlr.h"
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#include "py/compile.h"
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#include "py/runtime.h"
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#include "py/repl.h"
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#include "py/gc.h"
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#include "lib/utils/pyexec.h"
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void do_str(const char *src, mp_parse_input_kind_t input_kind) {
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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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printf("MemoryError: lexer could not allocate memory\n");
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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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qstr source_name = lex->source_name;
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mp_parse_tree_t parse_tree = mp_parse(lex, input_kind);
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mp_obj_t module_fun = mp_compile(&parse_tree, source_name, MP_EMIT_OPT_NONE, true);
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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_plat_print, (mp_obj_t)nlr.ret_val);
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}
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}
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static char *stack_top;
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static char heap[16 * 1024];
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int real_main(void) {
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int stack_dummy;
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stack_top = (char*)&stack_dummy;
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#if MICROPY_ENABLE_GC
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gc_init(heap, heap + sizeof(heap));
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#endif
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mp_init();
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#if MICROPY_REPL_EVENT_DRIVEN
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pyexec_event_repl_init();
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for (;;) {
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int c = mp_hal_stdin_rx_chr();
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if (pyexec_event_repl_process_char(c)) {
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break;
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}
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}
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#else
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pyexec_friendly_repl();
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#endif
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//do_str("print('hello world!', list(x+1 for x in range(10)), end='eol\\n')", MP_PARSE_SINGLE_INPUT);
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//do_str("for i in range(10):\r\n print(i)", MP_PARSE_FILE_INPUT);
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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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// WARNING: This gc_collect implementation doesn't try to get root
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// pointers from CPU registers, and thus may function incorrectly.
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void *dummy;
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gc_collect_start();
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gc_collect_root(&dummy, ((mp_uint_t)stack_top - (mp_uint_t)&dummy) / sizeof(mp_uint_t));
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gc_collect_end();
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gc_dump_info();
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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(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs) {
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
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void nlr_jump_fail(void *val) {
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}
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void NORETURN __fatal_error(const char *msg) {
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while (1);
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}
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#ifndef NDEBUG
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void MP_WEAK __assert_func(const char *file, int line, const char *func, const char *expr) {
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printf("Assertion '%s' failed, at file %s:%d\n", expr, file, line);
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__fatal_error("Assertion failed");
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}
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#endif

‎zephyr/mpconfigport.h

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#include <alloca.h>
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// Saving extra crumbs to make sure binary fits in 128K
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#define MICROPY_COMP_CONST_FOLDING (0)
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#define MICROPY_COMP_CONST (0)
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#define MICROPY_COMP_DOUBLE_TUPLE_ASSIGN (0)
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#define MICROPY_ENABLE_GC (1)
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#define MICROPY_HELPER_REPL (1)
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#define MICROPY_REPL_AUTO_INDENT (1)
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#define MICROPY_CPYTHON_COMPAT (0)
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#define MICROPY_PY_ASYNC_AWAIT (0)
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#define MICROPY_PY_ATTRTUPLE (0)
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#define MICROPY_PY_BUILTINS_ENUMERATE (0)
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#define MICROPY_PY_BUILTINS_FILTER (0)
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#define MICROPY_PY_BUILTINS_MIN_MAX (0)
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#define MICROPY_PY_BUILTINS_PROPERTY (0)
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#define MICROPY_PY_BUILTINS_RANGE_ATTRS (0)
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#define MICROPY_PY_BUILTINS_REVERSED (0)
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#define MICROPY_PY_BUILTINS_SET (0)
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#define MICROPY_PY_BUILTINS_SLICE (0)
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#define MICROPY_PY_ARRAY (0)
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#define MICROPY_PY_COLLECTIONS (0)
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#define MICROPY_PY_CMATH (0)
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#define MICROPY_PY_IO (0)
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#define MICROPY_PY_STRUCT (0)
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#define MICROPY_PY_SYS_MODULES (0)
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#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_LONGLONG)
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#define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_FLOAT)
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#define MICROPY_PY_BUILTINS_COMPLEX (0)
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#define MICROPY_HW_BOARD_NAME "zephyr-generic"
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#define MICROPY_HW_MCU_NAME "unknown-cpu"
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typedef int mp_int_t; // must be pointer size
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typedef unsigned mp_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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typedef long mp_off_t;
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#define BYTES_PER_WORD (sizeof(mp_int_t))
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#define MP_STATE_PORT MP_STATE_VM
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#define MICROPY_PORT_ROOT_POINTERS \
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const char *readline_hist[8];
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// Include Zephyr's autoconf.h, which should be made first by Zephyr makefiles
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#include "autoconf.h"

‎zephyr/mphalport.h

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static inline mp_uint_t mp_hal_ticks_ms(void) { return 0; }
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static inline void mp_hal_set_interrupt_char(char c) {}

‎zephyr/uart_core.c

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#include <unistd.h>
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#include "py/mpconfig.h"
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#include "src/zephyr_getchar.h"
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// Stopgap
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extern void printk(const char*, ...);
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/*
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* Core UART functions to implement for a port
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*/
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// Receive single character
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int mp_hal_stdin_rx_chr(void) {
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return zephyr_getchar();
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}
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// Send string of given length
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void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
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while (len--) {
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printk("%c", *str++);
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}
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}

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