From 309a47c7810bf55d993210c2da014ede7dae8a87 Mon Sep 17 00:00:00 2001
From: Kevin O'Connor <kevin@koconnor.net>
Date: Fri, 1 Mar 2019 19:31:18 -0500
Subject: [PATCH] atsamd: Reduce memory for have_run_init in spi/i2c

Some of the samd21 chips have limited memory - change the code to
reduce the size of global variables.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
---
 src/atsamd/i2c.c | 6 +++---
 src/atsamd/spi.c | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/atsamd/i2c.c b/src/atsamd/i2c.c
index 89b190fa..e5e0a379 100644
--- a/src/atsamd/i2c.c
+++ b/src/atsamd/i2c.c
@@ -16,10 +16,10 @@
 static void
 i2c_init(uint32_t bus, SercomI2cm *si)
 {
-    static int have_run_init[8];
-    if (have_run_init[bus])
+    static uint8_t have_run_init;
+    if (have_run_init & (1<<bus))
         return;
-    have_run_init[bus] = 1;
+    have_run_init |= 1<<bus;
 
     // Configure i2c
     si->CTRLA.reg = 0;
diff --git a/src/atsamd/spi.c b/src/atsamd/spi.c
index 4bf281bc..96125d5b 100644
--- a/src/atsamd/spi.c
+++ b/src/atsamd/spi.c
@@ -13,10 +13,10 @@
 void
 spi_init(uint32_t bus, SercomSpi *ss, uint32_t ctrla, uint32_t baud)
 {
-    static int have_run_init[8];
-    if (have_run_init[bus])
+    static uint8_t have_run_init;
+    if (have_run_init & (1<<bus))
         return;
-    have_run_init[bus] = 1;
+    have_run_init |= 1<<bus;
 
     ss->CTRLA.reg = 0;
     ss->CTRLA.reg = ctrla & ~SERCOM_SPI_CTRLA_ENABLE;