samd/mcu/samd21: Reorganize and enable more firmware features.

This commit enables additional features for SAMD21 with external flash:
- Viper and native code support.  On a relatively slow devices, viper and
  native code can be helpful.
- Freeze the asyncio scripts and add the select module.
- Enable Framebuffer support.
- Enable UART flow control.
- Enable a few more features from the extra features set.

Drop onewire and asyncio support from SAMD21 firmware without external
flash, leaving a little bit more room for future extensions.  Asyncio was
anyhow incomplete.

Signed-off-by: robert-hh <robert@hammelrath.com>

6 files changed, 51 insertions, 17 deletions

diff --git a/ports/samd/Makefile b/ports/samd/Makefile
index 4f4c22c57..5a7cb9916 100644
--- a/ports/samd/Makefile
+++ b/ports/samd/Makefile
@@ -68,7 +68,8 @@ CFLAGS += $(INC) -Wall -Werror -std=c99 -nostdlib -mthumb $(CFLAGS_MCU) -fsingle
 CFLAGS += -DMCU_$(MCU_SERIES) -D__$(CMSIS_MCU)__
 CFLAGS += $(CFLAGS_EXTRA)
 
-CFLAGS += -DMICROPY_HW_CODESIZE=$(MICROPY_HW_CODESIZE)
+# Strip the letter 'K' from MICROPY_HW_CODESIZE for use by C code.
+CFLAGS += -DMICROPY_HW_CODESIZE=$(strip $(subst K,' ', $(MICROPY_HW_CODESIZE)))
 
 LDFLAGS += -nostdlib $(addprefix -T,$(LD_FILES)) -Map=$@.map --cref
 LDFLAGS += --defsym=_codesize=$(MICROPY_HW_CODESIZE)
diff --git a/ports/samd/mcu/samd21/manifest.py b/ports/samd/mcu/samd21/manifest.py
new file mode 100644
index 000000000..2a19a843f
--- /dev/null
+++ b/ports/samd/mcu/samd21/manifest.py
@@ -0,0 +1,5 @@
+include("$(PORT_DIR)/boards/manifest.py")
+include("$(MPY_DIR)/extmod/asyncio")
+require("onewire")
+require("ds18x20")
+require("dht")
diff --git a/ports/samd/mcu/samd21/mpconfigmcu.h b/ports/samd/mcu/samd21/mpconfigmcu.h
index 1a3d95872..35e59a670 100644
--- a/ports/samd/mcu/samd21/mpconfigmcu.h
+++ b/ports/samd/mcu/samd21/mpconfigmcu.h
@@ -1,25 +1,28 @@
 // Deinitions common to all SAMD21 boards
 #include "samd21.h"
 
-#define MICROPY_CONFIG_ROM_LEVEL        (MICROPY_CONFIG_ROM_LEVEL_CORE_FEATURES)
+#define MICROPY_CONFIG_ROM_LEVEL        (MICROPY_CONFIG_ROM_LEVEL_BASIC_FEATURES)
+#if MICROPY_HW_CODESIZE == 248
+#define SAMD21_EXTRA_FEATURES           1
+#else
+#define SAMD21_EXTRA_FEATURES           0
+#endif
 
 // MicroPython emitters
-#define MICROPY_EMIT_THUMB              (0)
-#define MICROPY_EMIT_INLINE_THUMB       (0)
+#define MICROPY_EMIT_THUMB              (SAMD21_EXTRA_FEATURES)
+#define MICROPY_EMIT_INLINE_THUMB       (SAMD21_EXTRA_FEATURES)
+#define MICROPY_EMIT_THUMB_ARMV7M       (0)
 #define MICROPY_MODULE_BUILTIN_INIT     (1)
 
 #define MICROPY_FLOAT_IMPL              (MICROPY_FLOAT_IMPL_FLOAT)
 
-#ifndef MICROPY_PY_BUILTINS_COMPLEX
-#define MICROPY_PY_BUILTINS_COMPLEX     (0)
-#endif
-
-#ifndef MICROPY_PY_TIME
-#define MICROPY_PY_TIME                 (1)
-#endif
-
 #ifndef MICROPY_PY_MATH
 #define MICROPY_PY_MATH                 (1)
+#define MP_NEED_LOG2                    (1)
+#endif
+
+#ifndef MICROPY_PY_BUILTINS_COMPLEX
+#define MICROPY_PY_BUILTINS_COMPLEX     (0)
 #endif
 
 #ifndef MICROPY_PY_CMATH
@@ -29,13 +32,36 @@
 #define MICROPY_PY_RANDOM_SEED_INIT_FUNC (trng_random_u32(300))
 unsigned long trng_random_u32(int delay);
 
-#define VFS_BLOCK_SIZE_BYTES            (1536) // 24x 64B flash pages;
-
 #ifndef MICROPY_HW_UART_TXBUF
 #define MICROPY_HW_UART_TXBUF           (1)
 #endif
+#ifndef MICROPY_HW_UART_RTSCTS
+#define MICROPY_HW_UART_RTSCTS          (SAMD21_EXTRA_FEATURES)
+#endif
 
+// selected extensions of the extra features set
 #define MICROPY_PY_OS_URANDOM           (1)
+#define MICROPY_COMP_TRIPLE_TUPLE_ASSIGN (SAMD21_EXTRA_FEATURES)
+#define MICROPY_COMP_RETURN_IF_EXPR     (SAMD21_EXTRA_FEATURES)
+#define MICROPY_OPT_MPZ_BITWISE         (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_BUILTINS_STR_CENTER  (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_BUILTINS_STR_PARTITION (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_BUILTINS_STR_SPLITLINES (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_BUILTINS_ROUND_INT   (SAMD21_EXTRA_FEATURES)
+#define MICROPY_CAN_OVERRIDE_BUILTINS   (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_SYS_STDIO_BUFFER     (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_FRAMEBUF             (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_ASYNCIO              (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_SELECT               (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_ERRNO                (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_DEFLATE              (SAMD21_EXTRA_FEATURES)
+#define MICROPY_PY_ONEWIRE              (SAMD21_EXTRA_FEATURES)
+
+#ifndef MICROPY_PY_MACHINE_PIN_BOARD_CPU
+#define MICROPY_PY_MACHINE_PIN_BOARD_CPU (1)
+#endif
+
+#define VFS_BLOCK_SIZE_BYTES            (1536) // 24x 64B flash pages;
 
 #define CPU_FREQ                        (48000000)
 #define DFLL48M_FREQ                    (48000000)
diff --git a/ports/samd/mcu/samd21/mpconfigmcu.mk b/ports/samd/mcu/samd21/mpconfigmcu.mk
index b3092837c..89e63c3aa 100644
--- a/ports/samd/mcu/samd21/mpconfigmcu.mk
+++ b/ports/samd/mcu/samd21/mpconfigmcu.mk
@@ -6,6 +6,10 @@ MPY_CROSS_MCU_ARCH = armv6m
 
 MICROPY_HW_CODESIZE ?= 184K
 
+ifeq ($(MICROPY_HW_CODESIZE), 248K)
+FROZEN_MANIFEST ?= mcu/$(MCU_SERIES_LOWER)/manifest.py
+endif
+
 MICROPY_VFS_LFS1 ?= 1
 
 SRC_S += shared/runtime/gchelper_thumb1.s
diff --git a/ports/samd/mcu/samd51/mpconfigmcu.h b/ports/samd/mcu/samd51/mpconfigmcu.h
index 7c95c341b..b8206558b 100644
--- a/ports/samd/mcu/samd51/mpconfigmcu.h
+++ b/ports/samd/mcu/samd51/mpconfigmcu.h
@@ -27,6 +27,7 @@
 
 #define MICROPY_PY_OS_SYNC              (1)
 #define MICROPY_PY_OS_URANDOM           (1)
+#define MICROPY_PY_ONEWIRE              (1)
 #define MICROPY_PY_RANDOM_SEED_INIT_FUNC (trng_random_u32())
 unsigned long trng_random_u32(void);
 
diff --git a/ports/samd/mpconfigport.h b/ports/samd/mpconfigport.h
index 466a4d775..a7a6e2662 100644
--- a/ports/samd/mpconfigport.h
+++ b/ports/samd/mpconfigport.h
@@ -107,8 +107,6 @@
 #define MICROPY_PY_UCTYPES                  (1)
 #define MICROPY_PY_HEAPQ                    (1)
 #define MICROPY_PY_RANDOM                   (1)
-#define MICROPY_PY_DEFLATE                  (1)
-#define MICROPY_PY_ASYNCIO                  (1)
 #ifndef MICROPY_PY_MACHINE_ADC
 #define MICROPY_PY_MACHINE_ADC              (1)
 #endif
@@ -150,7 +148,6 @@
 #define MICROPY_PY_MACHINE_WDT              (1)
 #define MICROPY_PY_MACHINE_WDT_INCLUDEFILE  "ports/samd/machine_wdt.c"
 #define MICROPY_PY_MACHINE_WDT_TIMEOUT_MS   (1)
-#define MICROPY_PY_ONEWIRE                  (1)
 #define MICROPY_PY_PLATFORM                 (1)
 #define MICROPY_PLATFORM_VERSION            "ASF4"