[lpc408x]添加定时器驱动

bsp/lpc408x/drivers/drv_hwtimer.c

+/*
+ * File      : drv_hwtimer.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2015, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author           Notes
+ * 2015-09-02     heyuanjie87      the first version
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include "lpc_timer.h"
+#include "lpc_clkpwr.h"
+#include "drv_hwtimer.h"
+
+#ifdef RT_USING_HWTIMER
+
+static void NVIC_Configuration(void)
+{
+    NVIC_EnableIRQ(TIMER0_IRQn);
+}
+
+static void timer_init(rt_hwtimer_t *timer, rt_uint32_t state)
+{
+    LPC_TIM_TypeDef *tim;
+    TIM_TIMERCFG_Type cfg;
+
+    tim = (LPC_TIM_TypeDef *)timer->parent.user_data;
+
+    TIM_DeInit(tim);
+
+    if (state == 1)
+    {
+        NVIC_Configuration();
+
+        cfg.PrescaleOption = TIM_PRESCALE_TICKVAL;
+        cfg.PrescaleValue = 0xFFFF;
+        TIM_Init(tim, TIM_TIMER_MODE, &cfg);
+    }
+}
+
+static rt_err_t timer_start(rt_hwtimer_t *timer, rt_uint32_t t, rt_hwtimer_mode_t opmode)
+{
+    LPC_TIM_TypeDef *tim;
+    TIM_MATCHCFG_Type match;
+
+    tim = (LPC_TIM_TypeDef *)timer->parent.user_data;
+
+    match.MatchChannel = 0;
+    match.IntOnMatch = ENABLE;
+    match.ResetOnMatch = ENABLE;
+    match.StopOnMatch = (opmode == HWTIMER_MODE_ONESHOT)? ENABLE : DISABLE;
+    match.ExtMatchOutputType = 0;
+    match.MatchValue = t;
+
+    TIM_ConfigMatch(tim, &match);
+    TIM_Cmd(tim, ENABLE);
+
+    return RT_EOK;
+}
+
+static void timer_stop(rt_hwtimer_t *timer)
+{
+    LPC_TIM_TypeDef *tim;
+
+    tim = (LPC_TIM_TypeDef *)timer->parent.user_data;
+
+    TIM_Cmd(tim, DISABLE);
+}
+
+static rt_err_t timer_ctrl(rt_hwtimer_t *timer, rt_uint32_t cmd, void *arg)
+{
+    LPC_TIM_TypeDef *tim;
+    rt_err_t err = RT_EOK;
+
+    tim = (LPC_TIM_TypeDef *)timer->parent.user_data;
+
+    switch (cmd)
+    {
+    case HWTIMER_CTRL_FREQ_SET:
+    {
+        uint32_t clk;
+        uint32_t pre;
+
+        clk = CLKPWR_GetCLK(CLKPWR_CLKTYPE_PER);
+        pre = clk / *((uint32_t*)arg) - 1;
+        tim->PR = pre;
+    }
+    break;
+    default:
+    {
+        err = -RT_ENOSYS;
+    }
+    break;
+    }
+
+    return err;
+}
+
+static rt_uint32_t timer_counter_get(rt_hwtimer_t *timer)
+{
+    LPC_TIM_TypeDef *tim;
+
+    tim = (LPC_TIM_TypeDef *)timer->parent.user_data;
+
+    return tim->TC;
+}
+
+static const struct rt_hwtimer_info _info =
+{
+    1000000,           /* the maximum count frequency can be set */
+    2000,              /* the minimum count frequency can be set */
+    0xFFFFFF,          /* the maximum counter value */
+    HWTIMER_CNTMODE_UP,/* Increment or Decreasing count mode */
+};
+
+static const struct rt_hwtimer_ops _ops =
+{
+    timer_init,
+    timer_start,
+    timer_stop,
+    timer_counter_get,
+    timer_ctrl,
+};
+
+static rt_hwtimer_t _timer0;
+
+int lpc_hwtimer_init(void)
+{
+    _timer0.info = &_info;
+    _timer0.ops  = &_ops;
+
+    rt_device_hwtimer_register(&_timer0, "timer0", LPC_TIM0);
+
+    return 0;
+}
+
+void TIMER0_IRQHandler(void)
+{
+    if (TIM_GetIntStatus(LPC_TIM0, TIM_MR0_INT) != RESET)
+    {
+        TIM_ClearIntPending(LPC_TIM0, TIM_MR0_INT);
+        rt_device_hwtimer_isr(&_timer0);
+    }
+}
+
+INIT_BOARD_EXPORT(lpc_hwtimer_init);
+#endif

bsp/lpc408x/drivers/drv_hwtimer.h

+#ifndef __DRV_HWTIMER_H__
+#define __DRV_HWTIMER_H__
+
+
+int stm32_hwtimer_init(void);
+
+
+#endif