debugging, with instrumentation

shared-bindings/microcontroller/Processor.c

@@ -97,8 +97,9 @@ const mp_obj_property_t mcu_processor_reset_reason_obj = {
 //|
 //|     Is `None` if the temperature is not available."""
 //|
+extern volatile float indicator;
 STATIC mp_obj_t mcu_processor_get_temperature(mp_obj_t self) {
-    float temperature = common_hal_mcu_processor_get_temperature();
+    float temperature = indicator; // common_hal_mcu_processor_get_temperature();
     return isnan(temperature) ? mp_const_none : mp_obj_new_float(temperature);
 }
 

shared-bindings/usb_hid/Device.c

@@ -136,7 +136,7 @@ STATIC mp_obj_t usb_hid_device_make_new(const mp_obj_type_t *type, size_t n_args
             // It's not the actual argument that's out of range, but its elements.
             // But the error message is close enough.
             MP_OBJ_SMALL_INT_VALUE(mp_obj_subscr(report_ids, i_obj, MP_OBJ_SENTINEL)),
-            1, 255, MP_QSTR_report_ids);
+            0, 255, MP_QSTR_report_ids);
 
         in_report_lengths_array[i] = (uint8_t)mp_arg_validate_int_range(
             MP_OBJ_SMALL_INT_VALUE(mp_obj_subscr(in_report_lengths, i_obj, MP_OBJ_SENTINEL)),

shared-bindings/usb_hid/__init__.c

@@ -40,6 +40,11 @@
 //| """Tuple of all active HID device interfaces.
 //| The default set of devices is ``Device.KEYBOARD, Device.MOUSE, Device.CONSUMER_CONTROL``,
 //| On boards where `usb_hid` is disabled by default, `devices` is an empty tuple.
+//|
+//| If a boot device is enabled by `usb_hid.enable)`, *and* the host has requested a boot device,
+//| the `devices` tuple is *replaced* when ``code.py`` starts with a single-element tuple
+//| containing a `Device` that describes the boot device chosen (keyboard or mouse).
+//| The request for a boot device overrides any other HID devices.
 //| """
 //|
 
@@ -84,12 +89,12 @@ MP_DEFINE_CONST_FUN_OBJ_0(usb_hid_disable_obj, usb_hid_disable);
 //|     Boot devices implement a fixed, predefined report descriptor, defined in
 //|     https://www.usb.org/sites/default/files/hid1_12.pdf, Appendix B. A USB host
 //|     can request to use the boot device if the USB device says it is available.
-//|     Usually only a BIOS or other kind of boot-time, limited-functionality
+//|     Usually only a BIOS or other kind of limited-functionality
 //|     host needs boot keyboard support.
 //|
 //|     For example, to make a boot keyboard available, you can use this code::
 //|
-//|       usb_hid.enable((Device.KEYBOARD), boot_device=1)
+//|       usb_hid.enable((Device.KEYBOARD), boot_device=1)  # 1 for a keyboard
 //|
 //|     If the host requests the boot keyboard, the report descriptor provided by `Device.KEYBOARD`
 //|     will be ignored, and the predefined report descriptor will be used.
@@ -104,11 +109,11 @@ STATIC mp_obj_t usb_hid_enable(size_t n_args, const mp_obj_t *pos_args, mp_map_t
     enum { ARG_devices, ARG_boot_device };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_devices, MP_ARG_REQUIRED | MP_ARG_OBJ },
-        { MP_QSTR_boot_device, MP_ARG_OBJ, {.u_int = 0} },
+        { MP_QSTR_boot_device, MP_ARG_INT, {.u_int = 0} },
     };
 
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
-    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+    mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     mp_obj_t devices = args[ARG_devices].u_obj;
     const mp_int_t len = mp_obj_get_int(mp_obj_len(devices));
@@ -128,7 +133,7 @@ STATIC mp_obj_t usb_hid_enable(size_t n_args, const mp_obj_t *pos_args, mp_map_t
 
     return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_KW(usb_hid_enable_obj, 2, usb_hid_enable);
+MP_DEFINE_CONST_FUN_OBJ_KW(usb_hid_enable_obj, 1, usb_hid_enable);
 
 //| def get_boot_device() -> int:
 //|     """
@@ -138,8 +143,6 @@ MP_DEFINE_CONST_FUN_OBJ_KW(usb_hid_enable_obj, 2, usb_hid_enable);
 //|       If the host did request a boot device,
 //|       returns the value of ``boot_device`` set in `usb_hid.enable()`:
 //|       ``1`` for a boot keyboard, or ``2`` for boot mouse.
-//|       Your device driver should check and act on this value if the keyboard or mouse
-//|       device you specified provides reports that differ from the standard boot keyboard or mouse.
 //|       However, the standard devices provided by CircuitPython, `Device.KEYBOARD` and `Device.MOUSE`,
 //|       describe reports that match the boot device reports, so you don't need to check this
 //|       if you are using those devices.

shared-module/usb_hid/__init__.c

@@ -31,10 +31,12 @@
 #include "py/gc.h"
 #include "py/runtime.h"
 #include "shared-bindings/usb_hid/__init__.h"
-#include "shared-module/usb_hid/Device.h"
+#include "shared-bindings/usb_hid/Device.h"
 #include "supervisor/memory.h"
 #include "supervisor/usb.h"
 
+volatile float indicator = 0.1f;
+
 static const uint8_t usb_hid_descriptor_template[] = {
     0x09,        //  0 bLength
     0x04,        //  1 bDescriptorType (Interface)
@@ -86,6 +88,7 @@ static mp_int_t num_hid_devices;
 // Which boot device is available 0: no boot devices, 1: boot keyboard, 2: boot mouse.
 // This value is set by usb_hid.enable(), and used to build the HID interface descriptor.
 // The value is remembered here from boot.py to code.py.
+
 static uint8_t hid_boot_device;
 
 // Whether a boot device was requested by a SET_PROTOCOL request from the host.
@@ -106,6 +109,38 @@ static mp_obj_tuple_t default_hid_devices_tuple = {
     },
 };
 
+// These describe the standard descriptors used for boot keyboard and mouse, which don't use report IDs.
+// When the host requests a boot device, replace whatever HID devices were enabled with a tuple
+// containing just one of these, since the host is uninterested in other devices.
+// The driver code will then use the proper report length and send_report() will not send a report ID.
+static const usb_hid_device_obj_t boot_keyboard_obj = {
+    .base = {
+        .type = &usb_hid_device_type,
+    },
+    .report_descriptor = NULL,
+    .report_descriptor_length = 0,
+    .usage_page = 0x01,
+    .usage = 0x06,
+    .num_report_ids = 1,
+    .report_ids = { 0, },
+    .in_report_lengths = { 8, },
+    .out_report_lengths = { 1, },
+};
+
+static const usb_hid_device_obj_t boot_mouse_obj = {
+    .base = {
+        .type = &usb_hid_device_type,
+    },
+    .report_descriptor = NULL,
+    .report_descriptor_length = 0,
+    .usage_page = 0x01,
+    .usage = 0x02,
+    .num_report_ids = 1,
+    .report_ids = { 0, },
+    .in_report_lengths = { 4, },
+    .out_report_lengths = { 0, },
+};
+
 bool usb_hid_enabled(void) {
     return num_hid_devices > 0;
 }
@@ -121,6 +156,7 @@ uint8_t common_hal_usb_hid_get_boot_device(void) {
 
 void usb_hid_set_defaults(void) {
     hid_boot_device = 0;
+    hid_boot_device_requested = false;
     common_hal_usb_hid_enable(
         CIRCUITPY_USB_HID_ENABLED_DEFAULT ? &default_hid_devices_tuple : mp_const_empty_tuple, 0);
 }
@@ -209,7 +245,17 @@ bool common_hal_usb_hid_enable(const mp_obj_t devices, uint8_t boot_device) {
 
 // Called when HID devices are ready to be used, when code.py or the REPL starts running.
 void usb_hid_setup_devices(void) {
-    hid_boot_device_requested = false;
+
+    // If the host requested a boot device, replace the current list of devices
+    // with a single-element tuple containing the proper boot device.
+    if (hid_boot_device_requested) {
+        memcpy(&hid_devices[0],
+            // Will be 1 (keyboard) or 2 (mouse).
+            hid_boot_device == 1 ? &boot_keyboard_obj : &boot_mouse_obj,
+            sizeof(usb_hid_device_obj_t));
+        num_hid_devices = 1;
+    }
+
     usb_hid_set_devices_from_hid_devices();
 
     // Create report buffers on the heap.