feat: Add minimal pycardium

Signed-off-by: Rahix <rahix@rahix.de>

meson.build

@@ -34,4 +34,6 @@ subdir('lib/')
 subdir('bootloader/')
 
 subdir('epicardium/')
+subdir('pycardium/')
+
 subdir('hw-tests/')

pycardium/main.c

+#include "py/runtime.h"
+#include "py/gc.h"
+#include "lib/utils/pyexec.h"
+
+static char *stack_top;
+static char heap[4096];
+
+int main(void)
+{
+	/* TODO: Replace this with a proper heap implementation */
+	int stack_dummy;
+	stack_top = (char*)&stack_dummy;
+
+	gc_init(heap, heap + sizeof(heap));
+
+	mp_init();
+	pyexec_friendly_repl();
+
+	while (1) {
+		;
+	}
+}
+
+void gc_collect(void)
+{
+	/* TODO: Replace this with a proper heap implementation */
+	void*dummy;
+
+	gc_collect_start();
+	gc_collect_root(&dummy, ((mp_uint_t)stack_top - (mp_uint_t)&dummy) / sizeof(mp_uint_t));
+	gc_collect_end();
+}

pycardium/meson.build

+name = 'pycardium'
+
+modsrc = files(
+)
+
+#################################
+# MicroPython Generated Headers #
+#################################
+
+version_h = custom_target(
+  'mpversion.h',
+  output: 'mpversion.h',
+  command: [micropython_gen_version, '@OUTPUT@'],
+)
+
+modules_h = custom_target(
+  'moduledefs.h',
+  output: 'moduledefs.h',
+  input: [micropython_sources, modsrc],
+  command: [micropython_gen_modules, '@OUTPUT@', '@INPUT@'],
+)
+
+qstr_h = custom_target(
+  'qstrdefs.generated.h',
+  output: 'qstrdefs.generated.h',
+  input: [
+    # 'modules/qstrdefs.h',
+    'mpconfigport.h',
+    micropython_sources,
+  ],
+  depends: [modules_h, version_h],
+  command: [micropython_gen_qstr, meson.current_source_dir(), '@OUTPUT@', '@INPUT@'],
+)
+
+mp_headers = [version_h, modules_h, qstr_h]
+
+###################
+# MicroPython Lib #
+###################
+
+upy = static_library(
+  'micropython',
+  micropython_sources,
+  micropython_additional_sources,
+  mp_headers,
+  include_directories: micropython_includes,
+)
+
+executable(
+  name + '.elf',
+  'main.c',
+  'mphalport.c',
+  modsrc,
+  mp_headers,
+  include_directories: micropython_includes,
+  dependencies: [max32665_startup_core1, board_card10, periphdriver],
+  link_whole: [max32665_startup_core1_lib, board_card10_lib],
+  link_with: upy,
+  link_args: [
+    '-Wl,-Map=' + meson.current_build_dir() + '/' + name + '.map',
+  ],
+)

pycardium/mpconfigport.h

+/* Hardware Name */
+#define MICROPY_HW_BOARD_NAME "card10"
+#define MICROPY_HW_MCU_NAME "max32665"
+
+/* MicroPython Config Options */
+
+/*
+ * Right now, we do not support importing external modules
+ * though this might change in the future.
+ */
+#define MICROPY_ENABLE_EXTERNAL_IMPORT  (0)
+
+#define MICROPY_ENABLE_DOC_STRING           (1)
+#define MICROPY_ENABLE_GC                   (1)
+#define MICROPY_FLOAT_IMPL                  (MICROPY_FLOAT_IMPL_FLOAT)
+#define MICROPY_HELPER_REPL                 (1)
+#define MICROPY_LONGINT_IMPL                (MICROPY_LONGINT_IMPL_LONGLONG)
+#define MICROPY_PY_BUILTINS_HELP            (1)
+#define MICROPY_PY_BUILTINS_HELP_MODULES    (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;
+
+/*
+ * Make a pointer to RAM callable (eg set lower bit for Thumb code)
+ * (This scheme won't work if we want to mix Thumb and normal ARM code.)
+ */
+#define MICROPY_MAKE_POINTER_CALLABLE(p) ((void*)((mp_uint_t)(p) | 1))
+
+/* We need to provide a declaration/definition of alloca() */
+#include <alloca.h>
+
+/* TODO: Document this */
+#define MP_STATE_PORT MP_STATE_VM
+
+/* For some reason, we need to define readline history manually */
+#define MICROPY_PORT_ROOT_POINTERS \
+    const char *readline_hist[16];

pycardium/mphalport.c

+#include <stdint.h>
+
+#include "py/lexer.h"
+#include "py/mpconfig.h"
+#include "py/mperrno.h"
+#include "py/obj.h"
+#include "py/runtime.h"
+
+/******************************************************************************
+ * Serial Communication
+ */
+
+/* TODO: Use API boundary instead of direct communication */
+#include "uart.h"
+extern mxc_uart_regs_t * ConsoleUart;
+
+/* Receive single character */
+int mp_hal_stdin_rx_chr(void)
+{
+	return UART_ReadByte(ConsoleUart);
+}
+
+/* Send string of given length */
+void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len)
+{
+	UART_Write(ConsoleUart, (uint8_t*)str, len);
+}
+
+/******************************************************************************
+ * Fatal Errors
+ */
+
+void NORETURN nlr_jump_fail(void *val)
+{
+	/* TODO: Report error and restart */
+	while (1) {
+	}
+}
+
+/******************************************************************************
+ * Stubs
+ */
+
+mp_lexer_t *mp_lexer_new_from_file(const char *filename)
+{
+	/* TODO: Do we need an implementation for this? */
+	mp_raise_OSError(MP_ENOENT);
+}
+
+mp_obj_t mp_builtin_open(size_t n_args, const mp_obj_t *args, mp_map_t *kwargs)
+{
+	/* TODO: Once fs is implemented, get this working as well */
+	return mp_const_none;
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
+
+/******************************************************************************
+ * TODO: Remove
+ */
+
+int _getpid(void)
+{
+	;
+}
+
+int _kill(int pid, int f)
+{
+	;
+}
+
+void _exit(int r)
+{
+	;
+}

pycardium/mphalport.h

+#include "py/mpconfig.h"
+
+/* TODO: Replace this with a proper implementation */
+static inline mp_uint_t mp_hal_ticks_ms(void) { return 0; }
+
+/* TODO: Replace this with a proper implementation */
+static inline void mp_hal_set_interrupt_char(char c) {}