From dfb0d58cfb1e1e9fd4081fcfa38f2e8eafdc9491 Mon Sep 17 00:00:00 2001
From: Joakim Gebart <joakim.gebart@eistec.se>
Date: Fri, 16 Jan 2015 16:05:04 +0100
Subject: [PATCH] tests/periph_spi: Lock bus for exclusive access when
 communicating.

---
 tests/periph_spi/main.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/periph_spi/main.c b/tests/periph_spi/main.c
index 10f2c00544..2a65838f38 100644
--- a/tests/periph_spi/main.c
+++ b/tests/periph_spi/main.c
@@ -178,7 +178,9 @@ void cmd_init_master(int argc, char **argv)
     if (parse_spi_dev(argc, argv) < 0) {
         return;
     }
+    spi_acquire(spi_dev);
     res = spi_init_master(spi_dev, spi_mode, spi_speed);
+    spi_release(spi_dev);
     if (res < 0) {
         printf("spi_init_master: error initializing SPI_%i device (code %i)\n", spi_dev, res);
         return;
@@ -202,7 +204,9 @@ void cmd_init_slave(int argc, char **argv)
     if (parse_spi_dev(argc, argv) < 0) {
         return;
     }
+    spi_acquire(spi_dev);
     res = spi_init_slave(spi_dev, spi_mode, slave_on_data);
+    spi_release(spi_dev);
     if (res < 0) {
         printf("spi_init_slave: error initializing SPI_%i device (code: %i)\n", spi_dev, res);
         return;
@@ -236,9 +240,11 @@ void cmd_transfer(int argc, char **argv)
     }
 
     /* do the actual data transfer */
+    spi_acquire(spi_dev);
     gpio_clear(spi_cs);
     res = spi_transfer_bytes(spi_dev, hello, buffer, strlen(hello));
     gpio_set(spi_cs);
+    spi_release(spi_dev);
 
     /* look at the results */
     if (res < 0) {