From 5b0dbb97437305c20525f558b6a74bb25190c9d1 Mon Sep 17 00:00:00 2001
From: Max Regan <mgregan2@gmail.com>
Date: Mon, 13 Apr 2020 19:47:33 -0700
Subject: [PATCH] Add lightweight printf support

For now, printf() isn't hooked up to anything, but snprintf() can be
used to create a string to pass off to usart.tx_blocking().
---
 .gitmodules                | 3 +++
 firmware/Makefile          | 6 +++++-
 firmware/ThirdParty/printf | 1 +
 3 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 .gitmodules
 create mode 160000 firmware/ThirdParty/printf

diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..fb39347
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "firmware/ThirdParty/printf"]
+	path = firmware/ThirdParty/printf
+	url = https://github.com/mpaland/printf.git
diff --git a/firmware/Makefile b/firmware/Makefile
index 592fce7..5852a84 100644
--- a/firmware/Makefile
+++ b/firmware/Makefile
@@ -69,7 +69,7 @@ endif
 
 # Ignores dotfiles and other garbage some tools leave behind
 define find_important
-    $(shell find $(1) -type f -and -name $(2) -and -not -iname "*~" -and -not -iname "*#*" -and -not \( -path "*.cquery_cached_index*" \) -and -not \( -path "*build*" \) )
+    $(shell find $(1) -type f -and -name $(2) -and -not -iname "*~" -and -not -iname "*#*" -and -not \( -path "*.cquery_cached_index*" \) -and -not \( -path "*build*" \) -and -not \( -path  "*ThirdParty/printf/test/*" \) )
 endef
 
 FONTS        := small large_digits
@@ -118,10 +118,14 @@ CFLAGS += -ffreestanding
 CFLAGS += -fstack-usage -Wstack-usage=128
 # Defines
 CFLAGS += -D$(DEVICE_FAMILY_DEFINE) -D$(DEVICE_TYPE_DEFINE) -D$(DEVICE_LINE_DEFINE)
+CFLAGS += -DPRINTF_DISABLE_SUPPORT_FLOAT -DPRINTF_DISABLE_SUPPORT_EXPONENTIAL -DPRINTF_DISABLE_SUPPORT_PTRDIFF_T
+# Consider this one if we are running short on flash, it saved about 1K
+#CFLAGS += -DPRINTF_DISABLE_SUPPORT_LONG_LONG
 # Includes
 CFLAGS += -I./Bsp/Mcu/
 CFLAGS += -I./ThirdParty/stm32/$(DEVICE_LINE)/Include
 CFLAGS += -I./ThirdParty/CMSIS/Core/Include
+CFLAGS += -I./ThirdParty/printf
 CFLAGS += -I./build/gen/
 CFLAGS += -I.
 
diff --git a/firmware/ThirdParty/printf b/firmware/ThirdParty/printf
new file mode 160000
index 0000000..d3b9846
--- /dev/null
+++ b/firmware/ThirdParty/printf
@@ -0,0 +1 @@
+Subproject commit d3b984684bb8a8bdc48cc7a1abecb93ce59bbe3e