96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
#include "app_config.h"
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#include "system/includes.h"
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#include "device/device.h"
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#include "asm/clock.h"
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//用户只能选择：JL_TIMER2、JL_TIMER3、JL_TIMER4、JL_TIMER5
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//PWM使用定时器2或者3映射PWM时候，不能用于定时
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#ifdef USE_INTERRUPT_TEST_DEMO
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static JL_TIMER_TypeDef *TMR = JL_TIMER4;//选择定时器4
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static u8 timer_irq = IRQ_TIMER4_IDX;//选择定时器4
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static const u8 timer_index[16] = {0, 4, 1, 5, 2, 6, 3, 7, 8, 12, 9, 13, 10, 14, 11, 15};
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static const u32 timer_table[16] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768};
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static u32 timer_clk = 0;
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#define AWINLINE __attribute__((always_inline))
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//#define TSEC SEC_USED(.volatile_ram_code) //当中断1ms一下，建议使用函数放在内部ram
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#define TSEC
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static AWINLINE TSEC void timer_cfg(u32 freq, u32 us)
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{
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u32 clock = timer_clk;
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u8 psc = 0;
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u8 tmp = 0;
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u32 prd = 0;
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u32 ts = us / (1000 * 1000);//计算秒
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u32 tu = us % (1000 * 1000);//计算秒剩余us
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u8 i;
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float tp = 0;
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if (freq >= clock) {
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freq = clock;
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} else if (freq <= 1) {
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freq = 1;
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if (ts) {
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tp = (float)tu / (1000 * 1000);
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}
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}
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/*求prd值*/
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prd = clock / freq;
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if (prd > 65535) {
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for (psc = 0; psc < 16; psc++) {
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prd = (u32)(clock / (timer_table[psc]) / freq);
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if (prd <= 65535) {
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break;
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} else if (psc == 15) {
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prd = 65535;
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break;
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}
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}
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}
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prd = ts ? (prd * ts + tp * prd) : prd;
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psc = timer_index[psc];
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TMR->CON = 0;
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TMR->CNT = 0;
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TMR->CON |= BIT(14);
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TMR->PRD = prd;
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TMR->CON |= psc << 4; //lsb_clk分频
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TMR->CON |= BIT(0);
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}
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static void TSEC timer_set(u32 us)//设置时间，该函数可以在中断调用重新设置定时器值
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{
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u32 freq = 1000000 / us;
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timer_cfg(freq, us);
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}
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static void TSEC timer_freq_set(u32 freq)//设置频率，该函数可以在中断调用重新设置定时器值
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{
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timer_cfg(freq, 0);
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}
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static ___interrupt TSEC void timer_isr(void)//中断
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{
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if (TMR->CON & BIT(15)) {
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TMR->CON |= BIT(14);
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putchar('@');
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//todo，中断函数执行程序...
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}
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}
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//example test
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static int c_main(void)
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{
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timer_clk = clk_get("timer");//先获取定时器的时钟源
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request_irq(timer_irq, 3, timer_isr, 0);//注册中断函数定和中断优先级
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#if 1
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timer_set(50 * 1000); //初始化50ms进一次中断
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#else
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//timer_freq_set(10000);//设置10K频率进中断
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#endif
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return 0;
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}
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late_initcall(c_main);
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#endif
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