78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
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#include "asm/includes.h"
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#include "asm/gpio.h"
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static const u32 TIMERx_table[6] = {
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(u32)JL_TIMER0,
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(u32)JL_TIMER1,
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(u32)JL_TIMER2,
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(u32)JL_TIMER3,
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(u32)JL_TIMER4,
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(u32)JL_TIMER5,
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};
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/**
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* @param JL_TIMERx : JL_TIMER0/1/2/3/4/5
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* @param pwm_io : JL_PORTA_01, JL_PORTB_02,,,等等，支持任意普通IO
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* @param fre : 频率，单位Hz
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* @param duty : 初始占空比，0~10000对应0~100%
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*/
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void timer_pwm_init(JL_TIMER_TypeDef *JL_TIMERx, u32 pwm_io, u32 fre, u32 duty)
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{
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u8 tmr_num;
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for (tmr_num = 0; tmr_num < 6; tmr_num ++) {
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if ((u32)JL_TIMERx == TIMERx_table[tmr_num]) {
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break;
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}
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if (tmr_num == 5) {
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return;
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}
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}
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u32 timer_clk = 24000000;
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if (tmr_num == 3) {
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bit_clr_ie(IRQ_TIME3_IDX);
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}
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gpio_set_fun_output_port(pwm_io, FO_TMR0_PWM + tmr_num, 0, 1);
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gpio_set_die(pwm_io, 1);
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gpio_set_pull_up(pwm_io, 0);
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gpio_set_pull_down(pwm_io, 0);
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gpio_set_direction(pwm_io, 0);
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//初始化timer
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JL_TIMERx->CON = 0;
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JL_TIMERx->CON |= (6 << 2); //时钟源选择STD_24M
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JL_TIMERx->CON |= (0b0001 << 4); //时钟源再4分频
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JL_TIMERx->CNT = 0; //清计数值
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JL_TIMERx->PRD = timer_clk / (4 * fre); //设置周期
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//设置初始占空比
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JL_TIMERx->PWM = (JL_TIMERx->PRD * duty) / 10000; //0~10000对应0~100%
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JL_TIMERx->CON |= BIT(8) | (0b01 << 0); //计数模式
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}
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/**
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* @param JL_TIMERx : JL_TIMER0/1/2/3/4/5
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* @param duty : 占空比，0~10000对应0~100%
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*/
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void set_timer_pwm_duty(JL_TIMER_TypeDef *JL_TIMERx, u32 duty)
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{
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JL_TIMERx->PWM = (JL_TIMERx->PRD * duty) / 10000; //0~10000对应0~100%
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}
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/********************************* 以下SDK的参考示例 ****************************/
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void timer_pwm_test(void)
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{
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printf("*********** timer pwm test *************\n");
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timer_pwm_init(JL_TIMER4, IO_PORTC_02, 1000, 5000); //1KHz 50%
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timer_pwm_init(JL_TIMER5, IO_PORTC_03, 10000, 7500);//10KHz 75%
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extern void wdt_clr();
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while (1) {
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wdt_clr();
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}
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}
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