altos: Add button driver and event queue

With this, a single task can wait for any button or quadrature input
device.

Signed-off-by: Keith Packard <keithp@keithp.com>

3 files changed, 37 insertions, 1 deletions

diff --git a/src/stm-demo/Makefile b/src/stm-demo/Makefile
index 52bb7b51..340967fc 100644
--- a/src/stm-demo/Makefile
+++ b/src/stm-demo/Makefile
@@ -35,7 +35,9 @@ ALTOS_SRC = \
 	ao_i2c_stm.c \
 	ao_usb_stm.c \
 	ao_exti_stm.c \
-	ao_quadrature.c
+	ao_event.c \
+	ao_quadrature.c \
+	ao_button.c
 
 PRODUCT=StmDemo-v0.0
 PRODUCT_DEF=-DSTM_DEMO
diff --git a/src/stm-demo/ao_demo.c b/src/stm-demo/ao_demo.c
index 1b9813fe..fe7c69f2 100644
--- a/src/stm-demo/ao_demo.c
+++ b/src/stm-demo/ao_demo.c
@@ -17,7 +17,9 @@
 
 #include "ao.h"
 #include <ao_exti.h>
+#include <ao_event.h>
 #include <ao_quadrature.h>
+#include <ao_button.h>
 
 struct ao_task demo_task;
 
@@ -150,12 +152,29 @@ ao_temp (void)
 	printf ("temp: %d\n", temp);
 }
 
+static void
+ao_event(void)
+{
+	struct ao_event	event;
+
+	for (;;) {
+		flush();
+		ao_event_get(&event);
+		printf ("type %1d unit %1d tick %5u value %ld\n",
+			event.type, event.unit, event.tick, event.value);
+		if (event.value == 100)
+			break;
+	}
+
+}
+
 __code struct ao_cmds ao_demo_cmds[] = {
 	{ ao_dma_test,	"D\0DMA test" },
 	{ ao_spi_write, "W\0SPI write" },
 	{ ao_spi_read, "R\0SPI read" },
 	{ ao_i2c_write, "i\0I2C write" },
 	{ ao_temp, "t\0Show temp" },
+	{ ao_event, "e\0Monitor event queue" },
 	{ 0, NULL }
 };
 
@@ -174,6 +193,7 @@ main(void)
 	ao_i2c_init();
 	ao_exti_init();
 	ao_quadrature_init();
+	ao_button_init();
 
 	ao_timer_set_adc_interval(100);
 
diff --git a/src/stm-demo/ao_pins.h b/src/stm-demo/ao_pins.h
index 0c1ed8fc..77e42a28 100644
--- a/src/stm-demo/ao_pins.h
+++ b/src/stm-demo/ao_pins.h
@@ -170,6 +170,8 @@ struct ao_adc {
 #define HAS_I2C_2		0
 #define I2C_2_PB10_PB11		0
 
+#define AO_EVENT		1
+
 #define AO_QUADRATURE_COUNT	2
 #define AO_QUADRATURE_MODE	AO_EXTI_MODE_PULL_UP
 
@@ -181,4 +183,16 @@ struct ao_adc {
 #define AO_QUADRATURE_1_A	3
 #define AO_QUADRATURE_1_B	2
 
+#define AO_BUTTON_COUNT		2
+#define AO_BUTTON_MODE		AO_EXTI_MODE_PULL_UP
+
+#define AO_BUTTON_0_PORT	&stm_gpioc
+#define AO_BUTTON_0		6
+
+#define AO_BUTTON_1_PORT	&stm_gpioc
+#define AO_BUTTON_1		7
+
+#define AO_TICK_TYPE		uint32_t
+#define AO_TICK_SIGNED		int32_t
+
 #endif /* _AO_PINS_H_ */