84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
#include "asm/clock.h"
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#include "asm/gpio.h"
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#define OSC_Hz 24000000
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/**
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* @param JL_TIMERx : JL_TIMER0/1/2/3/4/5
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* @param fre : 频率，单位Hz，不小于95
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* @param duty : 初始占空比，0~10000对应0~100%
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* @param port : pwm脚，可选硬件脚，也可选非硬件脚。(建议选择硬件引脚)
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* @param output_ch : 映射通道，当pwm脚选择非硬件脚时有效，这时我们给他分配output_channel 0/1/2
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*/
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int timer_pwm_init(JL_TIMER_TypeDef *JL_TIMERx, u32 fre, u32 duty, u32 port, int output_ch)
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{
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u32 hw_port;
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switch ((u32)JL_TIMERx) {
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case (u32)JL_TIMER0 :
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hw_port = IO_PORTA_05;
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break;
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case (u32)JL_TIMER1 :
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hw_port = IO_PORTC_04;
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break;
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case (u32)JL_TIMER2 :
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hw_port = IO_PORTB_03;
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break;
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case (u32)JL_TIMER3 :
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bit_clr_ie(IRQ_TIME3_IDX);
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hw_port = IO_PORTB_05;
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break;
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case (u32)JL_TIMER4 :
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hw_port = IO_PORTA_01;
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break;
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case (u32)JL_TIMER5 :
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hw_port = IO_PORTB_07;
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break;
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default:
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return (-1);
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}
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if ((output_ch == (-1)) && (hw_port != port)) {
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//not support output_ch
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return (-1);
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}
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//初始化timer
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JL_TIMERx->CON = 0;
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JL_TIMERx->CON |= (0b10 << 2); //选择晶振时钟源：24MHz
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JL_TIMERx->CON |= (0b0001 << 4); //时钟源4分频
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JL_TIMERx->PRD = OSC_Hz / (4 * fre); //设置周期
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JL_TIMERx->PWM = (JL_TIMERx->PRD * duty) / fre; //0~10000对应0~100g
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JL_TIMERx->CNT = 0; //清计数值
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JL_TIMERx->CON |= (0b01 << 0); //计数模式
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if (hw_port == port) {
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gpio_set_die(hw_port, 1);
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gpio_set_pull_up(hw_port, 0);
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gpio_set_pull_down(hw_port, 0);
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gpio_set_direction(hw_port, 0);
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JL_TIMERx->CON |= BIT(8); //PWM使能
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} else {
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gpio_output_channle(port, output_ch);
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return 1;
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}
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return 0;
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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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void timer_pwm_test(void)
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{
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timer_pwm_init(JL_TIMER2, 10000, 2000, IO_PORTB_00, CH2_T2_PWM_OUT);
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timer_pwm_init(JL_TIMER3, 10000, 5000, IO_PORTB_05, 0);
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timer_pwm_init(JL_TIMER5, 10000, 8000, IO_PORTB_07, 0);
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}
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