nrf51822: Implement timer module

2 files changed, 100 insertions, 1 deletions

diff --git a/platform/nrf51822/Makefile.platform b/platform/nrf51822/Makefile.platform
index e250e20..be8b3ed 100644
--- a/platform/nrf51822/Makefile.platform
+++ b/platform/nrf51822/Makefile.platform
@@ -85,9 +85,11 @@ PLATFORM_SOURCE_FILES	= system_nrf51.c				\
 			  app_uart.c					\
 			  app_fifo.c					\
 			  app_gpiote.c					\
+			  app_timer.c					\
 			  nrf_delay.c					\
 			  nrf51822.c					\
-			  log.c
+			  log.c						\
+			  timer.c
 
 PLATFORM_ASM_PATHS	= $(SDK_TEMPLATE_PATH)/gcc
 
diff --git a/platform/nrf51822/timer.c b/platform/nrf51822/timer.c
new file mode 100644
index 0000000..0e2ddde
--- /dev/null
+++ b/platform/nrf51822/timer.c
@@ -0,0 +1,97 @@
+/**
+ *  The MIT License (MIT)
+ *
+ *  Copyright (c) 2013 Paulo B. de Oliveira Filho <pauloborgesfilho@gmail.com>
+ *  Copyright (c) 2013 Claudio Takahasi <claudio.takahasi@gmail.com>
+ *  Copyright (c) 2013 João Paulo Rechi Vita <jprvita@gmail.com>
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+#include <nrf51.h>
+#include <nrf51_bitfields.h>
+#include <app_timer.h>
+
+#include "timer.h"
+#include "log.h"
+
+#define PRESCALER			0
+#define MAX_TIMERS			4
+#define OP_QUEUE_SIZE			7
+
+static uint32_t APP_TIMER_BUF[CEIL_DIV(APP_TIMER_BUF_SIZE(MAX_TIMERS,
+				OP_QUEUE_SIZE + 1), sizeof(uint32_t))];
+
+int16_t timer_init(void)
+{
+	if (!NRF_CLOCK->EVENTS_LFCLKSTARTED) {
+		NRF_CLOCK->LFCLKSRC = CLOCK_LFCLKSRC_SRC_Xtal
+						<< CLOCK_LFCLKSRC_SRC_Pos;
+		NRF_CLOCK->TASKS_LFCLKSTART = 1;
+		while (!NRF_CLOCK->EVENTS_LFCLKSTARTED);
+	}
+
+	if (app_timer_init(PRESCALER, MAX_TIMERS, OP_QUEUE_SIZE + 1,
+					APP_TIMER_BUF, NULL) != NRF_SUCCESS)
+		return -1;
+
+	return 0;
+}
+
+int16_t timer_start(uint8_t type, uint32_t ms, timer_cb cb, void *user_data)
+{
+	app_timer_mode_t mode;
+	uint32_t ticks;
+	uint32_t id;
+
+	if (cb == NULL)
+		return -1;
+
+	switch (type) {
+	case TIMER_SINGLESHOT:
+		mode = APP_TIMER_MODE_SINGLE_SHOT;
+		break;
+	case TIMER_REPEATED:
+		mode = APP_TIMER_MODE_REPEATED;
+		break;
+	default:
+		return -1;
+	}
+
+	if (app_timer_create(&id, mode, cb) != NRF_SUCCESS)
+		return -1;
+
+	ticks = APP_TIMER_TICKS(ms, PRESCALER);
+
+	if (app_timer_start(id, ticks, user_data) != NRF_SUCCESS)
+		return -1;
+	
+	return id;
+}
+
+int16_t timer_stop(int16_t id)
+{
+	if (id < 0)
+		return -1;
+
+	if (app_timer_stop(id) != NRF_SUCCESS)
+		return -1;
+
+	return 0;
+}