1 files changed, 90 insertions, 0 deletions
diff --git a/stmhal/help.c b/stmhal/help.c
new file mode 100644
index 0000000000..9efe374524
--- /dev/null
+++ b/stmhal/help.c
@@ -0,0 +1,90 @@
+#include <stdio.h>
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "qstr.h"
+#include "obj.h"
+#include "map.h"
+
+STATIC const char *help_text =
+"Welcome to Micro Python!\n"
+"\n"
+"For online help please visit http://micropython.org/help/.\n"
+"\n"
+"Specific commands for the board:\n"
+"  pyb.info()      -- print some general information\n"
+"  pyb.gc()        -- run the garbage collector\n"
+"  pyb.repl_info(<val>) -- enable/disable printing of info after each command\n"
+"  pyb.delay(<n>)  -- wait for n milliseconds\n"
+"  pyb.udelay(<n>) -- wait for n microseconds\n"
+"  pyb.switch()    -- return True/False if switch pressed or not\n"
+"  pyb.Led(<n>)    -- create Led object for LED n (n=1,2,3,4)\n"
+"                     Led methods: on(), off(), toggle(), intensity(<n>)\n"
+"  pyb.Servo(<n>)  -- create Servo object for servo n (n=1,2,3,4)\n"
+"                     Servo methods: angle(<x>)\n"
+"  pyb.Accel()     -- create an Accelerometer object\n"
+"                     Accelerometer methods: x(), y(), z(), tilt()\n"
+"  pyb.rng()       -- get a 30-bit hardware random number\n"
+"  pyb.gpio(<port>)        -- get port value (port='A4' for example)\n"
+"  pyb.gpio(<port>, <val>) -- set port value, True or False, 1 or 0\n"
+"  pyb.ADC(<port>) -- make an analog port object (port='C0' for example)\n"
+"                     ADC methods: read()\n"
+"\n"
+"Control commands:\n"
+"  CTRL-A       -- on a blank line, enter raw REPL mode\n"
+"  CTRL-B       -- on a blank line, enter normal REPL mode\n"
+"  CTRL-C       -- interrupt a running program\n"
+"  CTRL-D       -- on a blank line, do a soft reset of the board\n"
+;
+
+STATIC void pyb_help_print_info_about_object(mp_obj_t name_o, const char *name_str, mp_obj_t value) {
+    if (name_o != MP_OBJ_NULL) {
+        printf("  ");
+        mp_obj_print(name_o, PRINT_STR);
+        printf(" -- ");
+    } else {
+        printf("  %s -- ", name_str);
+    }
+    mp_obj_print(value, PRINT_STR);
+    printf("\n");
+}
+
+STATIC mp_obj_t pyb_help(uint n_args, const mp_obj_t *args) {
+    if (n_args == 0) {
+        // print a general help message
+        printf("%s", help_text);
+
+    } else {
+        // try to print something sensible about the given object
+
+        printf("object ");
+        mp_obj_print(args[0], PRINT_STR);
+        printf(" is of type %s\n", mp_obj_get_type_str(args[0]));
+
+        mp_obj_type_t *type = mp_obj_get_type(args[0]);
+        mp_map_t *map = NULL;
+        if (type == &mp_type_module) {
+            map = mp_obj_module_get_globals(args[0]);
+        } else if (type->locals_dict != MP_OBJ_NULL && MP_OBJ_IS_TYPE(type->locals_dict, &dict_type)) {
+            map = mp_obj_dict_get_map(type->locals_dict);
+        }
+        if (map != NULL) {
+            for (uint i = 0; i < map->alloc; i++) {
+                if (map->table[i].key != MP_OBJ_NULL) {
+                    pyb_help_print_info_about_object(map->table[i].key, NULL, map->table[i].value);
+                }
+            }
+        }
+
+        if (type->methods != NULL) {
+            for (const mp_method_t *meth = type->methods; meth->name != NULL; meth++) {
+                pyb_help_print_info_about_object(MP_OBJ_NULL, meth->name, (mp_obj_t)meth->fun);
+            }
+        }
+    }
+
+    return mp_const_none;
+}
+
+MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_builtin_help_obj, 0, 1, pyb_help);