/* * Copyright (c) 2006-2018, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * first version */ // 硬件定时器源码 #include #include "ls1c_public.h" #include "ls1c_pin.h" #include "ls1c_clock.h" #include "ls1c_regs.h" #include "ls1c_pwm.h" #include "ls1c_timer.h" // 定时器中计数器(CNTR、HRC和LRC)的最大值 #define TIMER_COUNTER_MAX (0xffffff) /* * 获取指定定时器的寄存器基地址 * @timer 硬件定时器 * @ret 基地址 */ unsigned int timer_get_reg_base(ls1c_timer_t timer) { unsigned int reg_base = 0; switch (timer) { case TIMER_PWM0: reg_base = LS1C_REG_BASE_PWM0; break; case TIMER_PWM1: reg_base = LS1C_REG_BASE_PWM1; break; case TIMER_PWM2: reg_base = LS1C_REG_BASE_PWM2; break; case TIMER_PWM3: reg_base = LS1C_REG_BASE_PWM3; break; } return reg_base; } /* * 初始化定时器，并开始定时 * @timer_info 定时器和定时时间信息 */ void timer_init(timer_info_t *timer_info) { unsigned int timer_reg_base = 0; // 寄存器基地址 unsigned long timer_clk = 0; // 硬件定时器的时钟 unsigned long tmp; unsigned int ctrl = 0; // 控制寄存器中的控制信息 // 判断入参 if (NULL == timer_info) { return ; } /* * 把定时时间换算为计数器的值 * 计数器值 = 定时器的时钟 * 定时时间(单位ns) / 1000000000 * 龙芯1c的定时器时钟为APB时钟，达到126Mhz， * 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 */ timer_clk = clk_get_apb_rate(); tmp = (timer_clk / 1000000) * (timer_info->time_ns / 1000); // 将1000000000拆分为1000000和1000 tmp = MIN(tmp, TIMER_COUNTER_MAX); // 控制寄存器信息 ctrl = (1 << LS1C_PWM_INT_LRC_EN) | (0 << LS1C_PWM_INT_HRC_EN) | (0 << LS1C_PWM_CNTR_RST) | (0 << LS1C_PWM_INT_SR) | (1 << LS1C_PWM_INTEN) | (1 << LS1C_PWM_SINGLE) | (1 << LS1C_PWM_OE) | (1 << LS1C_PWM_CNT_EN); // 设置各个寄存器 timer_reg_base = timer_get_reg_base(timer_info->timer); // 获取寄存器基地址 reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_HRC)); reg_write_32(tmp--, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_LRC)); reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR)); reg_write_32(ctrl, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)); return ; } /* * 判断指定定时器是否超时(实现定时) * @timer_info 定时器 * @ret TRUE or FALSE */ BOOL timer_is_time_out(timer_info_t *timer_info) { unsigned int timer_reg_base = 0; // 寄存器基地址 unsigned int ctrl; // 控制寄存器的值 // 判断入参 if (NULL == timer_info) { return FALSE; } // 读取控制寄存器 timer_reg_base = timer_get_reg_base(timer_info->timer); ctrl = reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)); // 判断中断状态位 if (ctrl & (1 << LS1C_PWM_INT_SR)) { return TRUE; } else { return FALSE; } } /* * 停止定时器 * @timer_info 定时器 */ void timer_stop(timer_info_t *timer_info) { unsigned int timer_reg_base = 0; // 判断入参 if (NULL == timer_info) { return ; } timer_reg_base = timer_get_reg_base(timer_info->timer); reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)); return ; } /* * 获取定时器从初始化到现在的时间(实现计时功能)，单位ns * @timer_info 硬件定时器 * @ret 时间，单位ns */ unsigned long timer_get_time_ns(timer_info_t *timer_info) { unsigned int timer_reg_base = 0; unsigned int cntr = 0; // 寄存器CNTR的值 unsigned long time_ns = 0; // 时间，单位ns unsigned long timer_clk = 0; // 定时器时钟 // 读取寄存器CNTR的值 timer_reg_base = timer_get_reg_base(timer_info->timer); cntr = reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR)); /* * 将CNTR值换算为时间，单位us * 时间 = (计数器值CNTR * 1000000000) / 定时器时钟频率 * 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) */ timer_clk = clk_get_apb_rate(); time_ns = (cntr * 1000 ) / (timer_clk /1000000); // printf("[%s] time_us=%lu, cntr=%d, timer_clk=%d\n", __FUNCTION__, time_ns, cntr, timer_clk); return time_ns; } /* * 打印timer相关寄存器的值 * @timer_info 硬件定时器 */ void timer_print_regs(timer_info_t *timer_info) { unsigned int timer_reg_base = 0; timer_reg_base = timer_get_reg_base(timer_info->timer); printf("CNTR=0x%x, HRC=0x%x, LRC=0x%x, CTRL=0x%x\n", reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR)), reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_HRC)), reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_LRC)), reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL))); return ; } /* * 定时器中断清 * @timer_info 定时器信息 */ void timer_int_clr(timer_info_t *timer_info) { unsigned int timer_reg_base = 0; // 寄存器基地址 unsigned int ctrl ; // 判断入参 if (NULL == timer_info) { return ; } timer_reg_base = timer_get_reg_base(timer_info->timer); // 获取寄存器基地址 ctrl = reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)); ctrl = ctrl | (1<timer); // 获取寄存器基地址 ctrl = reg_read_32((volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)); ctrl = ctrl | (1<time_ns / 1000); // 将1000000000拆分为1000000和1000 l_value = MIN(l_value, TIMER_COUNTER_MAX); h_value = (timer_clk / 1000000) * (timer_info->time_h_ns / 1000); // 将1000000000拆分为1000000和1000 h_value = MIN(h_value, l_value); // 控制寄存器信息 ctrl = (lrc << LS1C_PWM_INT_LRC_EN) | (hrc << LS1C_PWM_INT_HRC_EN) | (0 << LS1C_PWM_CNTR_RST) | (0 << LS1C_PWM_INT_SR) | (1 << LS1C_PWM_INTEN) | (1 << LS1C_PWM_SINGLE) | (1 << LS1C_PWM_OE) | (1 << LS1C_PWM_CNT_EN); // 设置各个寄存器 timer_reg_base = timer_get_reg_base(timer_info->timer); // 获取寄存器基地址 reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_HRC)); reg_write_32(l_value--, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_LRC)); reg_write_32(h_value--, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_HRC)); reg_write_32(0, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CNTR)); reg_write_32(ctrl, (volatile unsigned int *)(timer_reg_base + LS1C_PWM_CTRL)); return ; }