From f9d21637a3e54ba227f7c1c5003af6ffefe8cacc Mon Sep 17 00:00:00 2001
From: Kamil Tomaszewski <kamil.tomaszewski@sony.com>
Date: Tue, 2 Mar 2021 13:34:38 +0100
Subject: [PATCH 1/2] spresense: return valid  reference voltage

---
 ports/cxd56/common-hal/analogio/AnalogIn.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/ports/cxd56/common-hal/analogio/AnalogIn.c b/ports/cxd56/common-hal/analogio/AnalogIn.c
index a26647ac6f..5c47991eb2 100644
--- a/ports/cxd56/common-hal/analogio/AnalogIn.c
+++ b/ports/cxd56/common-hal/analogio/AnalogIn.c
@@ -114,11 +114,18 @@ uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
 
 // Reference voltage is a fixed value which is depending on the board.
 // e.g.)
-// - Reference Voltage of A4 and A5 pins on Main Board is 0.7V.
-// - Reference Voltage of A0 ~ A5 pins on External Interface board
-//   is selected 3.3V or 5.0V by a IO Volt jumper pin.
+// - Reference Voltage of A2 and A3 pins on Main Board is 0.7V.
+// - Reference Voltage of A0 ~ A5 pins on External Interface board is 5.0V
 float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {
-    return 0.0f;
+    float voltage;
+
+    if (self->number == 2 || self->number == 3) {
+        voltage = 0.0f;
+    } else {
+        voltage = 5.0f;
+    }
+
+    return voltage;
 }
 
 void analogin_reset(void) {

From 7c921b808b3cda1959875d269022d1c93bdbb5d9 Mon Sep 17 00:00:00 2001
From: Kamil Tomaszewski <kamil.tomaszewski@sony.com>
Date: Tue, 2 Mar 2021 14:23:28 +0100
Subject: [PATCH 2/2] spresense: Define LONGINT_IMPL as MPZ

---
 ports/cxd56/mpconfigport.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ports/cxd56/mpconfigport.mk b/ports/cxd56/mpconfigport.mk
index 33a993ad95..e767c6326f 100644
--- a/ports/cxd56/mpconfigport.mk
+++ b/ports/cxd56/mpconfigport.mk
@@ -10,8 +10,14 @@ USB_MSC_EP_NUM_IN = 4
 # Number of USB endpoint pairs.
 USB_NUM_EP = 6
 
+# Define an equivalent for MICROPY_LONGINT_IMPL, to pass to $(MPY-TOOL) in py/mkrules.mk
+# $(MPY-TOOL) needs to know what kind of longint to use (if any) to freeze long integers.
+# This should correspond to the MICROPY_LONGINT_IMPL definition in mpconfigport.h.
 MPY_TOOL_LONGINT_IMPL = -mlongint-impl=mpz
 
+# Longints can be implemented as mpz, as longlong, or not
+LONGINT_IMPL = MPZ
+
 CIRCUITPY_AUDIOBUSIO = 0
 CIRCUITPY_AUDIOIO = 0
 CIRCUITPY_CAMERA = 1