201 lines
5.0 KiB
C
201 lines
5.0 KiB
C
// 硬件定时器源码
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#include "ls1c_public.h"
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#include "ls1c_pin.h"
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#include "ls1c_clock.h"
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#include "ls1c_regs.h"
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#include "ls1c_pwm.h"
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#include "ls1c_timer.h"
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// 定时器中计数器(CNTR、HRC和LRC)的最大值
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#define TIMER_COUNTER_MAX (0xffffff)
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/*
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* 获取指定定时器的寄存器基地址
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* @timer 硬件定时器
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* @ret 基地址
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*/
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unsigned int timer_get_reg_base(ls1c_timer_t timer)
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{
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unsigned int reg_base = 0;
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switch (timer)
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{
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case TIMER_PWM0:
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reg_base = LS1C_REG_BASE_PWM0;
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break;
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case TIMER_PWM1:
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reg_base = LS1C_REG_BASE_PWM1;
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break;
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case TIMER_PWM2:
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reg_base = LS1C_REG_BASE_PWM2;
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break;
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case TIMER_PWM3:
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reg_base = LS1C_REG_BASE_PWM3;
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break;
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}
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return reg_base;
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}
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/*
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* 初始化定时器，并开始定时
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* @timer_info 定时器和定时时间信息
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*/
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void timer_init(timer_info_t *timer_info)
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{
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unsigned int timer_reg_base = 0; // 寄存器基地址
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unsigned long timer_clk = 0; // 硬件定时器的时钟
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unsigned long tmp;
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unsigned int ctrl = 0; // 控制寄存器中的控制信息
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// 判断入参
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if (NULL == timer_info)
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{
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return ;
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}
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/*
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* 把定时时间换算为计数器的值
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* 计数器值 = 定时器的时钟 * 定时时间(单位ns) / 1000000000
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* 龙芯1c的定时器时钟为APB时钟，达到126Mhz，
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* 为避免计算过程发生溢出，这里采用手动优化上面的计算式，也可以采用浮点运算
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*/
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timer_clk = clk_get_apb_rate();
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tmp = (timer_clk / 1000000) * (timer_info->time_ns / 1000); // 将1000000000拆分为1000000和1000
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tmp = MIN(tmp, TIMER_COUNTER_MAX);
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// 控制寄存器信息
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ctrl = (1 << LS1C_PWM_INT_LRC_EN)
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| (0 << LS1C_PWM_INT_HRC_EN)
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| (0 << LS1C_PWM_CNTR_RST)
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| (0 << LS1C_PWM_INT_SR)
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| (1 << LS1C_PWM_INTEN)
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| (1 << LS1C_PWM_SINGLE)
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| (1 << LS1C_PWM_OE)
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| (1 << LS1C_PWM_CNT_EN);
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// 设置各个寄存器
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timer_reg_base = timer_get_reg_base(timer_info->timer); // 获取寄存器基地址
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reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_HRC));
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reg_write_32(tmp--, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_LRC));
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reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR));
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reg_write_32(ctrl, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL));
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return ;
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}
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/*
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* 判断指定定时器是否超时(实现定时)
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* @timer_info 定时器
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* @ret TRUE or FALSE
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*/
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BOOL timer_is_time_out(timer_info_t *timer_info)
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{
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unsigned int timer_reg_base = 0; // 寄存器基地址
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unsigned int ctrl; // 控制寄存器的值
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// 判断入参
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if (NULL == timer_info)
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{
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return FALSE;
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}
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// 读取控制寄存器
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timer_reg_base = timer_get_reg_base(timer_info->timer);
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ctrl = reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL));
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// 判断中断状态位
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if (ctrl & (1 << LS1C_PWM_INT_SR))
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{
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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/*
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* 停止定时器
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* @timer_info 定时器
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*/
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void timer_stop(timer_info_t *timer_info)
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{
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unsigned int timer_reg_base = 0;
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// 判断入参
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if (NULL == timer_info)
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{
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return ;
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}
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timer_reg_base = timer_get_reg_base(timer_info->timer);
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reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL));
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return ;
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}
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/*
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* 获取定时器从初始化到现在的时间(实现计时功能)，单位ns
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* @timer_info 硬件定时器
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* @ret 时间，单位ns
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*/
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unsigned long timer_get_time_ns(timer_info_t *timer_info)
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{
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unsigned int timer_reg_base = 0;
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unsigned int cntr = 0; // 寄存器CNTR的值
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unsigned long time_ns = 0; // 时间，单位ns
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unsigned long timer_clk = 0; // 定时器时钟
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// 读取寄存器CNTR的值
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timer_reg_base = timer_get_reg_base(timer_info->timer);
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cntr = reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR));
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/*
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* 将CNTR值换算为时间，单位us
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* 时间 = (计数器值CNTR * 1000000000) / 定时器时钟频率
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* 为避免产生溢出，手动优化上式为 时间 = (计数器值CNTR * 1000) / (定时器时钟频率 / 1000000)
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*/
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timer_clk = clk_get_apb_rate();
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time_ns = (cntr * 1000 ) / (timer_clk /1000000);
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// rt_kprintf("[%s] time_us=%lu, cntr=%d, timer_clk=%d\n", __FUNCTION__, time_ns, cntr, timer_clk);
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return time_ns;
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}
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/*
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* 打印timer相关寄存器的值
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* @timer_info 硬件定时器
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*/
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void timer_print_regs(timer_info_t *timer_info)
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{
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unsigned int timer_reg_base = 0;
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timer_reg_base = timer_get_reg_base(timer_info->timer);
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rt_kprintf("CNTR=0x%x, HRC=0x%x, LRC=0x%x, CTRL=0x%x\n",
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reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR)),
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reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_HRC)),
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reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_LRC)),
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reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)));
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return ;
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}
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