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Merge pull request #3018 from kaspar030/saml21_add_rtt

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saml21: add periph rtt support
This commit is contained in:
Hauke Petersen 2015-06-02 16:21:23 +02:00
commit 401adb8b58
3 changed files with 160 additions and 0 deletions
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1
boards/saml21-xpro/Makefile.features
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@ -1,6 +1,7 @@
FEATURES_PROVIDED += periph_gpio
FEATURES_PROVIDED += periph_spi
FEATURES_PROVIDED += cpp
FEATURES_PROVIDED += periph_rtt
FEATURES_PROVIDED += periph_timer
FEATURES_PROVIDED += periph_uart
FEATURES_MCU_GROUP = cortex_m0

9
boards/saml21-xpro/include/periph_conf.h
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@ -94,6 +94,15 @@ extern "C" {
#define RTC_NUMOF (0)
/** @} */
/**
* @name RTT configuration
* @{
*/
#define RTT_FREQUENCY (32768U)
#define RTT_MAX_VALUE (0xffffffffU)
#define RTT_NUMOF (1)
/** @} */
/**
* @name GPIO configuration
* @{

150
cpu/saml21/periph/rtt.c Normal file
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@ -0,0 +1,150 @@
/*
* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
* 2015 FreshTemp, LLC.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup driver_periph
* @{
*
* @file rtt.c
* @brief Low-level RTT driver implementation
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*
* @}
*/
#include <stdint.h>
#include "periph/rtt.h"
#include "board.h"
#include "thread.h"
#define ENABLE_DEBUG 0
#include "debug.h"
static rtt_cb_t _overflow_cb;
static void* _overflow_arg;
static rtt_cb_t _cmp0_cb;
static void* _cmp0_arg;
void rtt_init(void)
{
DEBUG("%s:%d\n", __func__, __LINE__);
rtt_poweron();
/* reset */
RTC->MODE0.CTRLA.bit.SWRST = 1;
while(RTC->MODE0.CTRLA.bit.SWRST);
/* set 32bit counting mode */
RTC->MODE0.CTRLA.bit.MODE = 0;
/* set clock source */
OSC32KCTRL->RTCCTRL.reg = OSC32KCTRL_RTCCTRL_RTCSEL_ULP32K;
/* enable */
RTC->MODE0.CTRLA.bit.ENABLE = 1;
while(RTC->MODE0.SYNCBUSY.bit.ENABLE);
/* initially clear flag */
RTC->MODE0.INTFLAG.bit.CMP0 = 1;
/* enable RTT IRQ */
NVIC_EnableIRQ(RTC_IRQn);
DEBUG("%s:%d %u\n", __func__, __LINE__, (unsigned)rtt_get_counter());
}
void rtt_set_overflow_cb(rtt_cb_t cb, void *arg)
{
DEBUG("%s:%d\n", __func__, __LINE__);
/* clear overflow cb to avoid race while assigning */
rtt_clear_overflow_cb();
/* set callback variables */
_overflow_cb = cb;
_overflow_arg = arg;
/* enable overflow interrupt */
RTC->MODE0.INTENSET.bit.OVF = 1;
}
void rtt_clear_overflow_cb(void)
{
DEBUG("%s:%d\n", __func__, __LINE__);
/* disable overflow interrupt */
RTC->MODE0.INTENCLR.bit.OVF = 1;
}
uint32_t rtt_get_counter(void)
{
DEBUG("%s:%d\n", __func__, __LINE__);
while (RTC->MODE0.SYNCBUSY.bit.COUNT);
return RTC->MODE0.COUNT.reg;
}
void rtt_set_alarm(uint32_t alarm, rtt_cb_t cb, void *arg)
{
DEBUG("%s:%d alarm=%u\n", __func__, __LINE__, (unsigned)alarm);
/* disable interrupt to avoid race */
rtt_clear_alarm();
/* set COM register */
while (RTC->MODE0.SYNCBUSY.bit.COMP0);
RTC->MODE0.COMP[0].reg = alarm;
/* setup callback */
_cmp0_cb = cb;
_cmp0_arg = arg;
/* enable compare interrupt */
RTC->MODE0.INTENSET.bit.CMP0 = 1;
}
void rtt_clear_alarm(void)
{
DEBUG("%s:%d\n", __func__, __LINE__);
/* clear compare interrupt */
RTC->MODE0.INTENCLR.bit.CMP0 = 1;
}
void rtt_poweron(void)
{
DEBUG("%s:%d\n", __func__, __LINE__);
MCLK->APBAMASK.reg |= MCLK_APBAMASK_RTC;
}
void rtt_poweroff(void)
{
DEBUG("%s:%d\n", __func__, __LINE__);
MCLK->APBAMASK.reg &= ~MCLK_APBAMASK_RTC;
}
void isr_rtc(void)
{
if (RTC->MODE0.INTFLAG.bit.OVF) {
RTC->MODE0.INTFLAG.bit.OVF = 1;
if (_overflow_cb) {
_overflow_cb(_overflow_arg);
}
}
if (RTC->MODE0.INTFLAG.bit.CMP0) {
/* clear flag */
RTC->MODE0.INTFLAG.bit.CMP0 = 1;
/* disable interrupt */
RTC->MODE0.INTENCLR.bit.CMP0 = 1;
if (_cmp0_cb) {
_cmp0_cb(_cmp0_arg);
}
}
if (sched_context_switch_request) {
thread_yield();
}
}