remove ports/minimal
This commit is contained in:
Dan Halbert
parent
7692e06230
commit
c575cd7bc7
@ -1,91 +0,0 @@
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include ../../py/mkenv.mk
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CROSS = 0
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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 $(TOP)/py/py.mk
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ifeq ($(CROSS), 1)
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CROSS_COMPILE = arm-none-eabi-
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endif
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INC += -I.
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INC += -I$(TOP)
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INC += -I$(BUILD)
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ifeq ($(CROSS), 1)
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DFU = $(TOP)/tools/dfu.py
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PYDFU = $(TOP)/tools/pydfu.py
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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 = $(INC) -Wall -Werror -std=c99 -nostdlib $(CFLAGS_CORTEX_M4) $(COPT)
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LDFLAGS = -nostdlib -T stm32f405.ld -Map=$@.map --cref --gc-sections
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else
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LD = gcc
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CFLAGS = -m32 $(INC) -Wall -Werror -std=c99 $(COPT)
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LDFLAGS = -m32 -Wl,-Map=$@.map,--cref -Wl,--gc-sections
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endif
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# Tune for Debugging or Optimization
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ifeq ($(DEBUG), 1)
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CFLAGS += -O0 -ggdb
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else
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CFLAGS += -Os -DNDEBUG
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CFLAGS += -fdata-sections -ffunction-sections
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endif
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LIBS =
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SRC_C = \
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main.c \
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uart_core.c \
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lib/utils/printf.c \
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lib/utils/stdout_helpers.c \
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lib/utils/pyexec.c \
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lib/libc/string0.c \
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lib/mp-readline/readline.c \
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$(BUILD)/_frozen_mpy.c \
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OBJ = $(PY_CORE_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
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ifeq ($(CROSS), 1)
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all: $(BUILD)/firmware.dfu
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else
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all: $(BUILD)/firmware.elf
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endif
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$(BUILD)/_frozen_mpy.c: frozentest.mpy $(BUILD)/genhdr/qstrdefs.generated.h
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$(ECHO) "MISC freezing bytecode"
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$(Q)$(TOP)/tools/mpy-tool.py -f -q $(BUILD)/genhdr/qstrdefs.preprocessed.h -mlongint-impl=none $< > $@
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$(BUILD)/firmware.elf: $(OBJ)
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$(ECHO) "LINK $@"
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$(Q)$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
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$(Q)$(SIZE) $@
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$(BUILD)/firmware.bin: $(BUILD)/firmware.elf
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$(Q)$(OBJCOPY) -O binary -j .isr_vector -j .text -j .data $^ $(BUILD)/firmware.bin
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$(BUILD)/firmware.dfu: $(BUILD)/firmware.bin
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$(ECHO) "Create $@"
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$(Q)$(PYTHON) $(DFU) -b 0x08000000:$(BUILD)/firmware.bin $@
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deploy: $(BUILD)/firmware.dfu
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$(ECHO) "Writing $< to the board"
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$(Q)$(PYTHON) $(PYDFU) -u $<
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# Run emulation build on a POSIX system with suitable terminal settings
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run:
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stty raw opost -echo
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build/firmware.elf
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@echo Resetting terminal...
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# This sleep is useful to spot segfaults
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sleep 1
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reset
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test: $(BUILD)/firmware.elf
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$(Q)/bin/echo -e "print('hello world!', list(x+1 for x in range(10)), end='eol\\\\n')\\r\\n\\x04" | $(BUILD)/firmware.elf | tail -n2 | grep "^hello world! \\[1, 2, 3, 4, 5, 6, 7, 8, 9, 10\\]eol"
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include $(TOP)/py/mkrules.mk
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@ -1,47 +0,0 @@
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# The minimal port
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This port is intended to be a minimal MicroPython port that actually runs.
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It can run under Linux (or similar) and on any STM32F4xx MCU (eg the pyboard).
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## Building and running Linux version
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By default the port will be built for the host machine:
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$ make
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To run the executable and get a basic working REPL do:
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$ make run
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## Building for an STM32 MCU
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The Makefile has the ability to build for a Cortex-M CPU, and by default
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includes some start-up code for an STM32F4xx MCU and also enables a UART
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for communication. To build:
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$ make CROSS=1
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If you previously built the Linux version, you will need to first run
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`make clean` to get rid of incompatible object files.
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Building will produce the build/firmware.dfu file which can be programmed
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to an MCU using:
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$ make CROSS=1 deploy
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This version of the build will work out-of-the-box on a pyboard (and
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anything similar), and will give you a MicroPython REPL on UART1 at 9600
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baud. Pin PA13 will also be driven high, and this turns on the red LED on
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the pyboard.
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## Building without the built-in MicroPython compiler
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This minimal port can be built with the built-in MicroPython compiler
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disabled. This will reduce the firmware by about 20k on a Thumb2 machine,
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and by about 40k on 32-bit x86. Without the compiler the REPL will be
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disabled, but pre-compiled scripts can still be executed.
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To test out this feature, change the `MICROPY_ENABLE_COMPILER` config
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option to "0" in the mpconfigport.h file in this directory. Then
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recompile and run the firmware and it will execute the frozentest.py
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file.
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Binary file not shown.
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print('uPy')
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print('a long string that is not interned')
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print('a string that has unicode αβγ chars')
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print(b'bytes 1234\x01')
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print(123456789)
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for i in range(4):
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print(i)
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@ -1,258 +0,0 @@
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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/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 "py/mperrno.h"
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#include "lib/utils/pyexec.h"
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#if MICROPY_ENABLE_COMPILER
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void do_str(const char *src, mp_parse_input_kind_t input_kind) {
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nlr_buf_t nlr;
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if (nlr_push(&nlr) == 0) {
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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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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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#endif
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static char *stack_top;
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#if MICROPY_ENABLE_GC
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static char heap[2048];
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#endif
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int main(int argc, char **argv) {
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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_ENABLE_COMPILER
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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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#else
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pyexec_frozen_module("frozentest.py");
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#endif
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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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mp_raise_OSError(MP_ENOENT);
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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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while (1);
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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
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#if MICROPY_MIN_USE_CORTEX_CPU
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// this is a minimal IRQ and reset framework for any Cortex-M CPU
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extern uint32_t _estack, _sidata, _sdata, _edata, _sbss, _ebss;
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void Reset_Handler(void) __attribute__((naked));
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void Reset_Handler(void) {
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// set stack pointer
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__asm volatile ("ldr sp, =_estack");
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// copy .data section from flash to RAM
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for (uint32_t *src = &_sidata, *dest = &_sdata; dest < &_edata;) {
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*dest++ = *src++;
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}
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// zero out .bss section
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for (uint32_t *dest = &_sbss; dest < &_ebss;) {
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*dest++ = 0;
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}
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// jump to board initialisation
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void _start(void);
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_start();
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}
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void Default_Handler(void) {
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for (;;) {
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}
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}
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const uint32_t isr_vector[] __attribute__((section(".isr_vector"))) = {
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(uint32_t)&_estack,
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(uint32_t)&Reset_Handler,
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(uint32_t)&Default_Handler, // NMI_Handler
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(uint32_t)&Default_Handler, // HardFault_Handler
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(uint32_t)&Default_Handler, // MemManage_Handler
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(uint32_t)&Default_Handler, // BusFault_Handler
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(uint32_t)&Default_Handler, // UsageFault_Handler
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0,
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0,
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0,
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0,
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(uint32_t)&Default_Handler, // SVC_Handler
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(uint32_t)&Default_Handler, // DebugMon_Handler
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0,
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(uint32_t)&Default_Handler, // PendSV_Handler
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(uint32_t)&Default_Handler, // SysTick_Handler
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};
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void _start(void) {
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// when we get here: stack is initialised, bss is clear, data is copied
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// SCB->CCR: enable 8-byte stack alignment for IRQ handlers, in accord with EABI
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*((volatile uint32_t*)0xe000ed14) |= 1 << 9;
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// initialise the cpu and peripherals
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#if MICROPY_MIN_USE_STM32_MCU
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void stm32_init(void);
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stm32_init();
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#endif
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// now that we have a basic system up and running we can call main
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main(0, NULL);
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// we must not return
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for (;;) {
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}
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}
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#endif
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#if MICROPY_MIN_USE_STM32_MCU
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// this is minimal set-up code for an STM32 MCU
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typedef struct {
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volatile uint32_t CR;
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volatile uint32_t PLLCFGR;
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volatile uint32_t CFGR;
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volatile uint32_t CIR;
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uint32_t _1[8];
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volatile uint32_t AHB1ENR;
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volatile uint32_t AHB2ENR;
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volatile uint32_t AHB3ENR;
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uint32_t _2;
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volatile uint32_t APB1ENR;
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volatile uint32_t APB2ENR;
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} periph_rcc_t;
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typedef struct {
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volatile uint32_t MODER;
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volatile uint32_t OTYPER;
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volatile uint32_t OSPEEDR;
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volatile uint32_t PUPDR;
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volatile uint32_t IDR;
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volatile uint32_t ODR;
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volatile uint16_t BSRRL;
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volatile uint16_t BSRRH;
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volatile uint32_t LCKR;
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volatile uint32_t AFR[2];
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} periph_gpio_t;
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typedef struct {
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volatile uint32_t SR;
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volatile uint32_t DR;
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volatile uint32_t BRR;
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volatile uint32_t CR1;
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} periph_uart_t;
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#define USART1 ((periph_uart_t*) 0x40011000)
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#define GPIOA ((periph_gpio_t*) 0x40020000)
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#define GPIOB ((periph_gpio_t*) 0x40020400)
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#define RCC ((periph_rcc_t*) 0x40023800)
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// simple GPIO interface
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#define GPIO_MODE_IN (0)
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#define GPIO_MODE_OUT (1)
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#define GPIO_MODE_ALT (2)
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#define GPIO_PULL_NONE (0)
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#define GPIO_PULL_UP (0)
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#define GPIO_PULL_DOWN (1)
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void gpio_init(periph_gpio_t *gpio, int pin, int mode, int pull, int alt) {
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gpio->MODER = (gpio->MODER & ~(3 << (2 * pin))) | (mode << (2 * pin));
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// OTYPER is left as default push-pull
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// OSPEEDR is left as default low speed
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gpio->PUPDR = (gpio->PUPDR & ~(3 << (2 * pin))) | (pull << (2 * pin));
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gpio->AFR[pin >> 3] = (gpio->AFR[pin >> 3] & ~(15 << (4 * (pin & 7)))) | (alt << (4 * (pin & 7)));
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}
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#define gpio_get(gpio, pin) ((gpio->IDR >> (pin)) & 1)
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#define gpio_set(gpio, pin, value) do { gpio->ODR = (gpio->ODR & ~(1 << (pin))) | (value << pin); } while (0)
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#define gpio_low(gpio, pin) do { gpio->BSRRH = (1 << (pin)); } while (0)
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#define gpio_high(gpio, pin) do { gpio->BSRRL = (1 << (pin)); } while (0)
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void stm32_init(void) {
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// basic MCU config
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RCC->CR |= (uint32_t)0x00000001; // set HSION
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RCC->CFGR = 0x00000000; // reset all
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RCC->CR &= (uint32_t)0xfef6ffff; // reset HSEON, CSSON, PLLON
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RCC->PLLCFGR = 0x24003010; // reset PLLCFGR
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RCC->CR &= (uint32_t)0xfffbffff; // reset HSEBYP
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RCC->CIR = 0x00000000; // disable IRQs
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// leave the clock as-is (internal 16MHz)
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// enable GPIO clocks
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RCC->AHB1ENR |= 0x00000003; // GPIOAEN, GPIOBEN
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// turn on an LED! (on pyboard it's the red one)
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gpio_init(GPIOA, 13, GPIO_MODE_OUT, GPIO_PULL_NONE, 0);
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gpio_high(GPIOA, 13);
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// enable UART1 at 9600 baud (TX=B6, RX=B7)
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gpio_init(GPIOB, 6, GPIO_MODE_ALT, GPIO_PULL_NONE, 7);
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gpio_init(GPIOB, 7, GPIO_MODE_ALT, GPIO_PULL_NONE, 7);
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RCC->APB2ENR |= 0x00000010; // USART1EN
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USART1->BRR = (104 << 4) | 3; // 16MHz/(16*104.1875) = 9598 baud
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USART1->CR1 = 0x0000200c; // USART enable, tx enable, rx enable
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}
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#endif
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@ -1,97 +0,0 @@
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#include <stdint.h>
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// options to control how MicroPython is built
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// You can disable the built-in MicroPython compiler by setting the following
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// config option to 0. If you do this then you won't get a REPL prompt, but you
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// will still be able to execute pre-compiled scripts, compiled with mpy-cross.
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#define MICROPY_ENABLE_COMPILER (1)
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#define MICROPY_QSTR_BYTES_IN_HASH (1)
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#define MICROPY_QSTR_EXTRA_POOL mp_qstr_frozen_const_pool
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#define MICROPY_ALLOC_PATH_MAX (256)
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#define MICROPY_ALLOC_PARSE_CHUNK_INIT (16)
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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_COMP_MODULE_CONST (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_COMP_TRIPLE_TUPLE_ASSIGN (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 (1)
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#define MICROPY_GC_ALLOC_THRESHOLD (0)
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#define MICROPY_REPL_EVENT_DRIVEN (0)
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#define MICROPY_HELPER_REPL (1)
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#define MICROPY_HELPER_LEXER_UNIX (0)
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||||
#define MICROPY_ENABLE_SOURCE_LINE (0)
|
||||
#define MICROPY_ENABLE_DOC_STRING (0)
|
||||
#define MICROPY_ERROR_REPORTING (MICROPY_ERROR_REPORTING_TERSE)
|
||||
#define MICROPY_BUILTIN_METHOD_CHECK_SELF_ARG (0)
|
||||
#define MICROPY_PY_ASYNC_AWAIT (0)
|
||||
#define MICROPY_PY_BUILTINS_BYTEARRAY (0)
|
||||
#define MICROPY_PY_BUILTINS_MEMORYVIEW (0)
|
||||
#define MICROPY_PY_BUILTINS_ENUMERATE (0)
|
||||
#define MICROPY_PY_BUILTINS_FILTER (0)
|
||||
#define MICROPY_PY_BUILTINS_FROZENSET (0)
|
||||
#define MICROPY_PY_BUILTINS_REVERSED (0)
|
||||
#define MICROPY_PY_BUILTINS_SET (0)
|
||||
#define MICROPY_PY_BUILTINS_SLICE (0)
|
||||
#define MICROPY_PY_BUILTINS_PROPERTY (0)
|
||||
#define MICROPY_PY_BUILTINS_MIN_MAX (0)
|
||||
#define MICROPY_PY___FILE__ (0)
|
||||
#define MICROPY_PY_GC (0)
|
||||
#define MICROPY_PY_ARRAY (0)
|
||||
#define MICROPY_PY_ATTRTUPLE (0)
|
||||
#define MICROPY_PY_COLLECTIONS (0)
|
||||
#define MICROPY_PY_MATH (0)
|
||||
#define MICROPY_PY_CMATH (0)
|
||||
#define MICROPY_PY_IO (0)
|
||||
#define MICROPY_PY_STRUCT (0)
|
||||
#define MICROPY_PY_SYS (0)
|
||||
#define MICROPY_MODULE_FROZEN_MPY (1)
|
||||
#define MICROPY_CPYTHON_COMPAT (0)
|
||||
#define MICROPY_LONGINT_IMPL (MICROPY_LONGINT_IMPL_NONE)
|
||||
#define MICROPY_FLOAT_IMPL (MICROPY_FLOAT_IMPL_NONE)
|
||||
|
||||
// type definitions for the specific machine
|
||||
|
||||
#define MICROPY_MAKE_POINTER_CALLABLE(p) ((void*)((mp_uint_t)(p) | 1))
|
||||
|
||||
// This port is intended to be 32-bit, but unfortunately, int32_t for
|
||||
// different targets may be defined in different ways - either as int
|
||||
// or as long. This requires different printf formatting specifiers
|
||||
// to print such value. So, we avoid int32_t and use int directly.
|
||||
#define UINT_FMT "%u"
|
||||
#define INT_FMT "%d"
|
||||
typedef int mp_int_t; // must be pointer size
|
||||
typedef unsigned mp_uint_t; // must be pointer size
|
||||
|
||||
typedef long mp_off_t;
|
||||
|
||||
#define MP_PLAT_PRINT_STRN(str, len) mp_hal_stdout_tx_strn_cooked(str, len)
|
||||
|
||||
// extra built in names to add to the global namespace
|
||||
#define MICROPY_PORT_BUILTINS \
|
||||
{ MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mp_builtin_open_obj) },
|
||||
|
||||
// We need to provide a declaration/definition of alloca()
|
||||
#include <alloca.h>
|
||||
|
||||
#define MICROPY_HW_BOARD_NAME "minimal"
|
||||
#define MICROPY_HW_MCU_NAME "unknown-cpu"
|
||||
|
||||
#ifdef __linux__
|
||||
#define MICROPY_MIN_USE_STDOUT (1)
|
||||
#endif
|
||||
|
||||
#ifdef __thumb__
|
||||
#define MICROPY_MIN_USE_CORTEX_CPU (1)
|
||||
#define MICROPY_MIN_USE_STM32_MCU (1)
|
||||
#endif
|
||||
|
||||
#define MP_STATE_PORT MP_STATE_VM
|
||||
|
||||
#define MICROPY_PORT_ROOT_POINTERS \
|
||||
const char *readline_hist[8];
|
||||
@ -1,2 +0,0 @@
|
||||
static inline mp_uint_t mp_hal_ticks_ms(void) { return 0; }
|
||||
static inline void mp_hal_set_interrupt_char(char c) {}
|
||||
@ -1 +0,0 @@
|
||||
// qstrs specific to this port
|
||||
@ -1,63 +0,0 @@
|
||||
/*
|
||||
GNU linker script for STM32F405
|
||||
*/
|
||||
|
||||
/* Specify the memory areas */
|
||||
MEMORY
|
||||
{
|
||||
FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 0x100000 /* entire flash, 1 MiB */
|
||||
CCMRAM (xrw) : ORIGIN = 0x10000000, LENGTH = 0x010000 /* 64 KiB */
|
||||
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 0x020000 /* 128 KiB */
|
||||
}
|
||||
|
||||
/* top end of the stack */
|
||||
_estack = ORIGIN(RAM) + LENGTH(RAM);
|
||||
|
||||
/* define output sections */
|
||||
SECTIONS
|
||||
{
|
||||
/* The program code and other data goes into FLASH */
|
||||
.text :
|
||||
{
|
||||
. = ALIGN(4);
|
||||
KEEP(*(.isr_vector)) /* isr vector table */
|
||||
*(.text) /* .text sections (code) */
|
||||
*(.text*) /* .text* sections (code) */
|
||||
*(.rodata) /* .rodata sections (constants, strings, etc.) */
|
||||
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
|
||||
|
||||
. = ALIGN(4);
|
||||
_etext = .; /* define a global symbol at end of code */
|
||||
_sidata = _etext; /* This is used by the startup in order to initialize the .data secion */
|
||||
} >FLASH
|
||||
|
||||
/* This is the initialized data section
|
||||
The program executes knowing that the data is in the RAM
|
||||
but the loader puts the initial values in the FLASH (inidata).
|
||||
It is one task of the startup to copy the initial values from FLASH to RAM. */
|
||||
.data : AT ( _sidata )
|
||||
{
|
||||
. = ALIGN(4);
|
||||
_sdata = .; /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
|
||||
*(.data) /* .data sections */
|
||||
*(.data*) /* .data* sections */
|
||||
|
||||
. = ALIGN(4);
|
||||
_edata = .; /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
|
||||
} >RAM
|
||||
|
||||
/* Uninitialized data section */
|
||||
.bss :
|
||||
{
|
||||
. = ALIGN(4);
|
||||
_sbss = .; /* define a global symbol at bss start; used by startup code */
|
||||
*(.bss)
|
||||
*(.bss*)
|
||||
*(COMMON)
|
||||
|
||||
. = ALIGN(4);
|
||||
_ebss = .; /* define a global symbol at bss end; used by startup code */
|
||||
} >RAM
|
||||
|
||||
.ARM.attributes 0 : { *(.ARM.attributes) }
|
||||
}
|
||||
@ -1,44 +0,0 @@
|
||||
#include <unistd.h>
|
||||
#include "py/mpconfig.h"
|
||||
|
||||
/*
|
||||
* Core UART functions to implement for a port
|
||||
*/
|
||||
|
||||
#if MICROPY_MIN_USE_STM32_MCU
|
||||
typedef struct {
|
||||
volatile uint32_t SR;
|
||||
volatile uint32_t DR;
|
||||
} periph_uart_t;
|
||||
#define USART1 ((periph_uart_t*)0x40011000)
|
||||
#endif
|
||||
|
||||
// Receive single character
|
||||
int mp_hal_stdin_rx_chr(void) {
|
||||
unsigned char c = 0;
|
||||
#if MICROPY_MIN_USE_STDOUT
|
||||
int r = read(0, &c, 1);
|
||||
(void)r;
|
||||
#elif MICROPY_MIN_USE_STM32_MCU
|
||||
// wait for RXNE
|
||||
while ((USART1->SR & (1 << 5)) == 0) {
|
||||
}
|
||||
c = USART1->DR;
|
||||
#endif
|
||||
return c;
|
||||
}
|
||||
|
||||
// Send string of given length
|
||||
void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
|
||||
#if MICROPY_MIN_USE_STDOUT
|
||||
int r = write(1, str, len);
|
||||
(void)r;
|
||||
#elif MICROPY_MIN_USE_STM32_MCU
|
||||
while (len--) {
|
||||
// wait for TXE
|
||||
while ((USART1->SR & (1 << 7)) == 0) {
|
||||
}
|
||||
USART1->DR = *str++;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user