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Diffstat (limited to 'examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/lightswitch-interrupt.c')
-rw-r--r--examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/lightswitch-interrupt.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/lightswitch-interrupt.c b/examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/lightswitch-interrupt.c
new file mode 100644
index 0000000..71a1008
--- /dev/null
+++ b/examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/lightswitch-interrupt.c
@@ -0,0 +1,71 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 chrysn <chrysn@fsfe.org>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/efm32/tinygecko/irq.h>
+#include <libopencm3/efm32/tinygecko/emu.h>
+
+#define ISER0 MMIO32(0xE000E100)
+
+void interrupt_setup()
+{
+ // These are the ports the pin interrupts for 8 and 11 are to be
+ // configured to, and they should trigger on falling edge.
+
+ GPIO_EXTIPSELH = (BUTTON0_PORT_EXTIPSEL << ((BUTTON0_PIN_NUMBER-8)*4)) |
+ (BUTTON1_PORT_EXTIPSEL << ((BUTTON1_PIN_NUMBER-8)*4));
+
+ GPIO_EXTIFALL = BUTTON0_PIN | BUTTON1_PIN;
+
+ // Enable interrupts on the GPIO side
+
+ GPIO_INSENSE = GPIO_INSENSE_INT;
+ GPIO_IEN = BUTTON0_PIN | BUTTON1_PIN;
+
+ // Enable GPIO interrupts in NVIC
+
+ ISER0 = (1<<IRQ_GPIO_EVEN) | (1<<IRQ_GPIO_ODD);
+}
+
+int main(void)
+{
+ gpio_setup();
+ interrupt_setup();
+
+ while(1) {
+ emu_sleep_em1();
+ };
+}
+
+void gpio_even_isr()
+{
+ // Clearing the GPIO interrupt pending register. While the NVIC
+ // interrupt pending register gets cleared automatically once it jumps
+ // here, the pin's pending state has to be cleared explicitly.
+ // (Dispatch to different subroutines for different even pins that
+ // trigger an interrupt would happen here.)
+ GPIO_IFC = BUTTON0_PIN;
+ led_on();
+}
+
+void gpio_odd_isr()
+{
+ // See gpio_even_isr.
+ GPIO_IFC = BUTTON1_PIN;
+ led_off();
+}