Diff: targets/TARGET_NUVOTON/TARGET_NUC472/us_ticker.c

Revision:

153:9398a535854b

Parent:

152:9a67f0b066fc

--- a/targets/TARGET_NUVOTON/TARGET_NUC472/us_ticker.c	Thu Dec 15 11:48:27 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,280 +0,0 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2015-2016 Nuvoton
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- 
-#include "us_ticker_api.h"
-#include "sleep_api.h"
-#include "mbed_assert.h"
-#include "nu_modutil.h"
-#include "nu_miscutil.h"
-#include "critical.h"
-
-// us_ticker tick = us = timestamp
-#define US_PER_TICK             1
-#define US_PER_SEC              (1000 * 1000)
-
-#define TMR0HIRES_CLK_PER_SEC           (1000 * 1000)
-#define TMR1HIRES_CLK_PER_SEC           (1000 * 1000)
-#define TMR1LORES_CLK_PER_SEC           (__LIRC)
-
-#define US_PER_TMR0HIRES_CLK            (US_PER_SEC / TMR0HIRES_CLK_PER_SEC)
-#define US_PER_TMR1HIRES_CLK            (US_PER_SEC / TMR1HIRES_CLK_PER_SEC)
-#define US_PER_TMR1LORES_CLK            (US_PER_SEC / TMR1LORES_CLK_PER_SEC)
-
-#define US_PER_TMR0HIRES_INT            (1000 * 1000 * 10)
-#define TMR0HIRES_CLK_PER_TMR0HIRES_INT ((uint32_t) ((uint64_t) US_PER_TMR0HIRES_INT * TMR0HIRES_CLK_PER_SEC / US_PER_SEC))
-
-
-// Determine to use lo-res/hi-res timer according to CD period
-#define US_TMR_SEP_CD       1000
-
-static void tmr0_vec(void);
-static void tmr1_vec(void);
-static void us_ticker_arm_cd(void);
-
-static int us_ticker_inited = 0;
-static volatile uint32_t counter_major = 0;
-static volatile uint32_t pd_comp_us = 0;    // Power-down compenstaion for normal counter
-static volatile uint32_t cd_major_minor_us = 0;
-static volatile uint32_t cd_minor_us = 0;
-static volatile int cd_hires_tmr_armed = 0; // Flag of armed or not of hi-res timer for CD counter
-
-// NOTE: PCLK is set up in mbed_sdk_init(), invocation of which must be before C++ global object constructor. See init_api.c for details.
-// NOTE: Choose clock source of timer:
-//       1. HIRC: Be the most accurate but might cause unknown HardFault.
-//       2. HXT: Less accurate and cannot pass mbed-drivers test.
-//       3. PCLK(HXT): Less accurate but can pass mbed-drivers test.
-// NOTE: TIMER_0 for normal counter, TIMER_1 for countdown.
-static const struct nu_modinit_s timer0hires_modinit = {TIMER_0, TMR0_MODULE, CLK_CLKSEL1_TMR0SEL_PCLK, 0, TMR0_RST, TMR0_IRQn, (void *) tmr0_vec};
-static const struct nu_modinit_s timer1lores_modinit = {TIMER_1, TMR1_MODULE, CLK_CLKSEL1_TMR1SEL_LIRC, 0, TMR1_RST, TMR1_IRQn, (void *) tmr1_vec};
-static const struct nu_modinit_s timer1hires_modinit = {TIMER_1, TMR1_MODULE, CLK_CLKSEL1_TMR1SEL_PCLK, 0, TMR1_RST, TMR1_IRQn, (void *) tmr1_vec};
-
-#define TMR_CMP_MIN         2
-#define TMR_CMP_MAX         0xFFFFFFu
-
-void us_ticker_init(void)
-{
-    if (us_ticker_inited) {
-        return;
-    }
-    
-    counter_major = 0;
-    pd_comp_us = 0;
-    cd_major_minor_us = 0;
-    cd_minor_us = 0;
-    cd_hires_tmr_armed = 0;
-    us_ticker_inited = 1;
-    
-    // Reset IP
-    SYS_ResetModule(timer0hires_modinit.rsetidx);
-    SYS_ResetModule(timer1lores_modinit.rsetidx);
-    
-    // Select IP clock source
-    CLK_SetModuleClock(timer0hires_modinit.clkidx, timer0hires_modinit.clksrc, timer0hires_modinit.clkdiv);
-    CLK_SetModuleClock(timer1lores_modinit.clkidx, timer1lores_modinit.clksrc, timer1lores_modinit.clkdiv);
-    // Enable IP clock
-    CLK_EnableModuleClock(timer0hires_modinit.clkidx);
-    CLK_EnableModuleClock(timer1lores_modinit.clkidx);
-
-    // Timer for normal counter
-    uint32_t clk_timer0 = TIMER_GetModuleClock((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
-    uint32_t prescale_timer0 = clk_timer0 / TMR0HIRES_CLK_PER_SEC - 1;
-    MBED_ASSERT((prescale_timer0 != (uint32_t) -1) && prescale_timer0 <= 127);
-    MBED_ASSERT((clk_timer0 % TMR0HIRES_CLK_PER_SEC) == 0);
-    uint32_t cmp_timer0 = TMR0HIRES_CLK_PER_TMR0HIRES_INT;
-    MBED_ASSERT(cmp_timer0 >= TMR_CMP_MIN && cmp_timer0 <= TMR_CMP_MAX);
-    ((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname))->CTL = TIMER_PERIODIC_MODE | prescale_timer0 | TIMER_CTL_CNTDATEN_Msk;
-    ((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname))->CMP = cmp_timer0;
-    
-    NVIC_SetVector(timer0hires_modinit.irq_n, (uint32_t) timer0hires_modinit.var);
-    NVIC_SetVector(timer1lores_modinit.irq_n, (uint32_t) timer1lores_modinit.var);
-    
-    NVIC_EnableIRQ(timer0hires_modinit.irq_n);
-    NVIC_EnableIRQ(timer1lores_modinit.irq_n);
-    
-    TIMER_EnableInt((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
-    TIMER_Start((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
-}
-
-uint32_t us_ticker_read()
-{
-    if (! us_ticker_inited) {
-        us_ticker_init();
-    }
-    
-    TIMER_T * timer0_base = (TIMER_T *) NU_MODBASE(timer0hires_modinit.modname);
-        
-    do {
-        uint32_t major_minor_us;
-        uint32_t minor_us;
-
-        // NOTE: As TIMER_CNT = TIMER_CMP and counter_major has increased by one, TIMER_CNT doesn't change to 0 for one tick time.
-        // NOTE: As TIMER_CNT = TIMER_CMP or TIMER_CNT = 0, counter_major (ISR) may not sync with TIMER_CNT. So skip and fetch stable one at the cost of 1 clock delay on this read.
-        do {
-            core_util_critical_section_enter();
-            
-            // NOTE: Order of reading minor_us/carry here is significant.
-            minor_us = TIMER_GetCounter(timer0_base) * US_PER_TMR0HIRES_CLK;
-            uint32_t carry = (timer0_base->INTSTS & TIMER_INTSTS_TIF_Msk) ? 1 : 0;
-            // When TIMER_CNT approaches TIMER_CMP and will wrap soon, we may get carry but TIMER_CNT not wrapped. Hanlde carefully carry == 1 && TIMER_CNT is near TIMER_CMP.
-            if (carry && minor_us > (US_PER_TMR0HIRES_INT / 2)) {
-                major_minor_us = (counter_major + 1) * US_PER_TMR0HIRES_INT;
-            }
-            else {
-                major_minor_us = (counter_major + carry) * US_PER_TMR0HIRES_INT + minor_us;
-            }
-            
-            core_util_critical_section_exit();
-        }
-        while (minor_us == 0 || minor_us == US_PER_TMR0HIRES_INT);
-        
-        // Add power-down compensation
-        return (major_minor_us + pd_comp_us) / US_PER_TICK;
-    }
-    while (0);
-}
-
-void us_ticker_disable_interrupt(void)
-{
-    TIMER_DisableInt((TIMER_T *) NU_MODBASE(timer1lores_modinit.modname));
-}
-
-void us_ticker_clear_interrupt(void)
-{
-    TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(timer1lores_modinit.modname));
-}
-
-void us_ticker_set_interrupt(timestamp_t timestamp)
-{
-    TIMER_Stop((TIMER_T *) NU_MODBASE(timer1lores_modinit.modname));
-    cd_hires_tmr_armed = 0;
-    
-    int delta = (int) (timestamp - us_ticker_read());
-    if (delta > 0) {
-        cd_major_minor_us = delta * US_PER_TICK;
-        us_ticker_arm_cd();
-    }
-    else {
-        cd_major_minor_us = cd_minor_us = 0;
-        /**
-         * This event was in the past. Set the interrupt as pending, but don't process it here.
-         * This prevents a recurive loop under heavy load which can lead to a stack overflow.
-         */  
-        NVIC_SetPendingIRQ(timer1lores_modinit.irq_n);
-    }
-}
-
-void us_ticker_prepare_sleep(struct sleep_s *obj)
-{
-    // Reject power-down if hi-res timer (HIRC/HXT) is now armed for CD counter.
-    if (obj->powerdown) {
-        obj->powerdown = ! cd_hires_tmr_armed;
-    }
-    
-    core_util_critical_section_enter();
-    
-    if (obj->powerdown) {
-        // NOTE: On entering power-down mode, HIRC/HXT will be disabled in normal mode, but not in ICE mode. This may cause confusion in development.
-        // To not be inconsistent due to above, always disable clock source of normal counter, and then re-enable it and make compensation on wakeup from power-down.
-        CLK_DisableModuleClock(timer0hires_modinit.clkidx);
-    }
-    
-    core_util_critical_section_exit();
-}
-
-void us_ticker_wakeup_from_sleep(struct sleep_s *obj)
-{
-    core_util_critical_section_enter();
-    
-    if (obj->powerdown) {
-        // Calculate power-down compensation
-        pd_comp_us += obj->period_us;
-        
-        CLK_EnableModuleClock(timer0hires_modinit.clkidx);
-    }
-    
-    core_util_critical_section_exit();
-}
-
-static void tmr0_vec(void)
-{
-    TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(timer0hires_modinit.modname));
-    counter_major ++;
-}
-
-static void tmr1_vec(void)
-{
-    TIMER_ClearIntFlag((TIMER_T *) NU_MODBASE(timer1lores_modinit.modname));
-    cd_major_minor_us = (cd_major_minor_us > cd_minor_us) ? (cd_major_minor_us - cd_minor_us) : 0;
-    cd_hires_tmr_armed = 0;
-    if (cd_major_minor_us == 0) {
-        // NOTE: us_ticker_set_interrupt() may get called in us_ticker_irq_handler();
-        us_ticker_irq_handler();
-    }
-    else {
-        us_ticker_arm_cd();
-    }
-}
-
-static void us_ticker_arm_cd(void)
-{
-    TIMER_T * timer1_base = (TIMER_T *) NU_MODBASE(timer1lores_modinit.modname);
-    uint32_t tmr1_clk_per_sec;
-    uint32_t us_per_tmr1_clk;
-    
-    /**
-     * Reserve US_TMR_SEP_CD-plus alarm period for hi-res timer
-     * 1. period >= US_TMR_SEP_CD * 2. Divide into two rounds:
-     *    US_TMR_SEP_CD * n (lo-res timer)
-     *    US_TMR_SEP_CD + period % US_TMR_SEP_CD (hi-res timer)
-     * 2. period < US_TMR_SEP_CD * 2. Just one round:
-     *    period (hi-res timer)
-     */
-    if (cd_major_minor_us >= US_TMR_SEP_CD * 2) {
-        cd_minor_us = cd_major_minor_us - cd_major_minor_us % US_TMR_SEP_CD - US_TMR_SEP_CD;
-        
-        CLK_SetModuleClock(timer1lores_modinit.clkidx, timer1lores_modinit.clksrc, timer1lores_modinit.clkdiv);
-        tmr1_clk_per_sec = TMR1LORES_CLK_PER_SEC;
-        us_per_tmr1_clk = US_PER_TMR1LORES_CLK;
-        
-        cd_hires_tmr_armed = 0;
-    }
-    else {
-        cd_minor_us = cd_major_minor_us;
-        
-        CLK_SetModuleClock(timer1hires_modinit.clkidx, timer1hires_modinit.clksrc, timer1hires_modinit.clkdiv);
-        tmr1_clk_per_sec = TMR1HIRES_CLK_PER_SEC;
-        us_per_tmr1_clk = US_PER_TMR1HIRES_CLK;
-        
-        cd_hires_tmr_armed = 1;
-    }
-    
-    // Reset 8-bit PSC counter, 24-bit up counter value and CNTEN bit
-    timer1_base->CTL |= TIMER_CTL_RSTCNT_Msk;
-    // One-shot mode, Clock = 1 MHz 
-    uint32_t clk_timer1 = TIMER_GetModuleClock((TIMER_T *) NU_MODBASE(timer1lores_modinit.modname));
-    uint32_t prescale_timer1 = clk_timer1 / tmr1_clk_per_sec - 1;
-    MBED_ASSERT((prescale_timer1 != (uint32_t) -1) && prescale_timer1 <= 127);
-    MBED_ASSERT((clk_timer1 % tmr1_clk_per_sec) == 0);
-    timer1_base->CTL &= ~(TIMER_CTL_OPMODE_Msk | TIMER_CTL_PSC_Msk | TIMER_CTL_CNTDATEN_Msk);
-    timer1_base->CTL |= TIMER_ONESHOT_MODE | prescale_timer1 | TIMER_CTL_CNTDATEN_Msk;
-    
-    uint32_t cmp_timer1 = cd_minor_us / us_per_tmr1_clk;
-    cmp_timer1 = NU_CLAMP(cmp_timer1, TMR_CMP_MIN, TMR_CMP_MAX);
-    timer1_base->CMP = cmp_timer1;
-    
-    TIMER_EnableInt(timer1_base);
-    TIMER_Start(timer1_base);
-}