Initial ESP32S2 port.

Basic blinky works but doesn't check pins.

7 files changed, 33 insertions, 15 deletions

diff --git a/supervisor/port.h b/supervisor/port.h
index ccbb314ad..8a12d34c8 100644
--- a/supervisor/port.h
+++ b/supervisor/port.h
@@ -29,6 +29,7 @@
 
 #include "py/mpconfig.h"
 
+#include "supervisor/memory.h"
 #include "supervisor/shared/safe_mode.h"
 
 // Provided by the linker;
@@ -60,6 +61,8 @@ uint32_t *port_stack_get_limit(void);
 // Get stack top address
 uint32_t *port_stack_get_top(void);
 
+supervisor_allocation* port_fixed_stack(void);
+
 // Get heap bottom address
 uint32_t *port_heap_get_bottom(void);
 
diff --git a/supervisor/shared/memory.c b/supervisor/shared/memory.c
index d52334eb4..8ae8a1699 100755
--- a/supervisor/shared/memory.c
+++ b/supervisor/shared/memory.c
@@ -129,5 +129,7 @@ supervisor_allocation* allocate_memory(uint32_t length, bool high) {
 }
 
 void supervisor_move_memory(void) {
+    #if CIRCUITPY_DISPLAYIO
     supervisor_display_move_memory();
+    #endif
 }
diff --git a/supervisor/shared/stack.c b/supervisor/shared/stack.c
index 2b7b1c03a..e7aa956b0 100755
--- a/supervisor/shared/stack.c
+++ b/supervisor/shared/stack.c
@@ -41,22 +41,24 @@ supervisor_allocation* stack_alloc = NULL;
 #define EXCEPTION_STACK_SIZE 1024
 
 void allocate_stack(void) {
-    mp_uint_t regs[10];
-    mp_uint_t sp = cpu_get_regs_and_sp(regs);
 
-    mp_uint_t c_size = (uint32_t) port_stack_get_top() - sp;
+    if (port_fixed_stack() != NULL) {
+        stack_alloc = port_fixed_stack();
+        current_stack_size = stack_alloc->length;
+    } else {
+        mp_uint_t regs[10];
+        mp_uint_t sp = cpu_get_regs_and_sp(regs);
 
-    if (port_stack_get_top() != port_heap_get_top()) {
-        return;
+        mp_uint_t c_size = (uint32_t) port_stack_get_top() - sp;
+        stack_alloc = allocate_memory(c_size + next_stack_size + EXCEPTION_STACK_SIZE, true);
+        if (stack_alloc == NULL) {
+            stack_alloc = allocate_memory(c_size + CIRCUITPY_DEFAULT_STACK_SIZE + EXCEPTION_STACK_SIZE, true);
+            current_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;
+        } else {
+            current_stack_size = next_stack_size;
+        }
     }
 
-    stack_alloc = allocate_memory(c_size + next_stack_size + EXCEPTION_STACK_SIZE, true);
-    if (stack_alloc == NULL) {
-        stack_alloc = allocate_memory(c_size + CIRCUITPY_DEFAULT_STACK_SIZE + EXCEPTION_STACK_SIZE, true);
-        current_stack_size = CIRCUITPY_DEFAULT_STACK_SIZE;
-    } else {
-        current_stack_size = next_stack_size;
-    }
     *stack_alloc->ptr = STACK_CANARY_VALUE;
 }
 
diff --git a/supervisor/shared/stack.h b/supervisor/shared/stack.h
index 1fb43be57..7096f0b3e 100755
--- a/supervisor/shared/stack.h
+++ b/supervisor/shared/stack.h
@@ -43,6 +43,8 @@ bool stack_ok(void);
 // exception when the stack has likely overwritten a portion of the heap.
 void assert_heap_ok(void);
 
+#ifndef STACK_CANARY_VALUE
 #define STACK_CANARY_VALUE 0x017829ef
+#endif
 
 #endif  // MICROPY_INCLUDED_SUPERVISOR_STACK_H
diff --git a/supervisor/shared/usb/tusb_config.h b/supervisor/shared/usb/tusb_config.h
index 1b0c83416..627de743e 100644
--- a/supervisor/shared/usb/tusb_config.h
+++ b/supervisor/shared/usb/tusb_config.h
@@ -52,7 +52,9 @@
 #define CFG_TUSB_DEBUG              0
 
 /*------------- RTOS -------------*/
+#ifndef CFG_TUSB_OS
 #define CFG_TUSB_OS                 OPT_OS_NONE
+#endif
 //#define CFG_TUD_TASK_QUEUE_SZ     16
 //#define CFG_TUD_TASK_PRIO         0
 //#define CFG_TUD_TASK_STACK_SZ     150
diff --git a/supervisor/shared/usb/usb.c b/supervisor/shared/usb/usb.c
index 774055a82..edf810118 100644
--- a/supervisor/shared/usb/usb.c
+++ b/supervisor/shared/usb/usb.c
@@ -75,7 +75,9 @@ void usb_init(void) {
 
 void usb_background(void) {
     if (usb_enabled()) {
+        #if CFG_TUSB_OS == OPT_OS_NONE
         tud_task();
+        #endif
         tud_cdc_write_flush();
     }
 }
diff --git a/supervisor/supervisor.mk b/supervisor/supervisor.mk
index d6422f074..195e4a9b2 100644
--- a/supervisor/supervisor.mk
+++ b/supervisor/supervisor.mk
@@ -3,7 +3,6 @@ SRC_SUPERVISOR = \
 	supervisor/port.c \
 	supervisor/shared/autoreload.c \
 	supervisor/shared/board.c \
-	supervisor/shared/display.c \
 	supervisor/shared/filesystem.c \
 	supervisor/shared/flash.c \
 	supervisor/shared/micropython.c \
@@ -104,6 +103,14 @@ else
 	CFLAGS += -DUSB_AVAILABLE
 endif
 
+SUPERVISOR_O = $(addprefix $(BUILD)/, $(SRC_SUPERVISOR:.c=.o))
+
+ifeq ($(CIRCUITPY_DISPLAYIO), 1)
+	SRC_SUPERVISOR += \
+		supervisor/shared/display.c
+
+	SUPERVISOR_O += $(BUILD)/autogen_display_resources.o
+endif
 ifndef USB_INTERFACE_NAME
 USB_INTERFACE_NAME = "CircuitPython"
 endif
@@ -182,8 +189,6 @@ ifeq ($(USB_RENUMBER_ENDPOINTS), 0)
 USB_DESCRIPTOR_ARGS += --no-renumber_endpoints
 endif
 
-SUPERVISOR_O = $(addprefix $(BUILD)/, $(SRC_SUPERVISOR:.c=.o)) $(BUILD)/autogen_display_resources.o
-
 $(BUILD)/supervisor/shared/translate.o: $(HEADER_BUILD)/qstrdefs.generated.h
 
 $(BUILD)/autogen_usb_descriptor.c $(BUILD)/genhdr/autogen_usb_descriptor.h: autogen_usb_descriptor.intermediate