RT-Thread-红外遥控接收测试（中科蓝讯 AB32VG1 RISC-V开发板模块评测任务）RT-Thread问答社区

红外遥控接收测试（中科蓝讯 AB32VG1 RISC-V开发板模块评测任务）

发布于 2021-03-16 20:50:28 浏览：1547 订阅该版

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`#include <rtthread.h>
#include "board.h"
/*****************************************************************************
 * Module    : Timer3 Capture Mapping选择列表
 *****************************************************************************/
#define TMR3MAP_PA5     (1 << 4)        //G1  capture mapping: PA5
#define TMR3MAP_PA6     (2 << 4)        //G2  capture mapping: PA6
#define TMR3MAP_PB0     (3 << 4)        //G3  capture mapping: PB0
#define TMR3MAP_PB1     (4 << 4)        //G4  capture mapping: PB1
#define TMR3MAP_PE0     (5 << 4)        //G5  capture mapping: PE0
#define TMR3MAP_PE5     (6 << 4)        //G6  capture mapping: PE5
#define TMR3MAP_PE6     (7 << 4)        //G7  capture mapping: PE6
#define IR_CAPTURE_PORT()               {GPIOEDE |= BIT(6); GPIOEPU  |= BIT(6); GPIOEDIR |= BIT(6);}
#define IRRX_MAPPING                    IRMAP_PE6
#define TMR3CAP_MAPPING                 TMR3MAP_PE6

typedef struct {
    unsigned short cnt;                            //ir data bit counter
    unsigned short rpt_cnt;                        //ir repeat counter
    unsigned short addr;                           //address,  inverted address   Extended NEC: 16bits address
    unsigned short cmd;                            //command,  inverted command
} ir_cb_t;
ir_cb_t ir_cb;
#define TMR3_RCLK               1000            //xosc26m_div 1M
//timer3 capture

void irrx_isr(int vector, void *param)//中断服务函数
{
    unsigned long tmrcnt;

if (TMR3CON & BIT(17)) {
        //timer1 capture interrupt
        TMR3CNT  = TMR3CNT - TMR3CPT;
        tmrcnt = TMR3CPT;
        TMR3CPND = BIT(17);
        tmrcnt /= TMR3_RCLK;                //convert to ms
       // rt_kprintf("ir: %2d\n",tmrcnt);
    } else if (TMR3CON & BIT(16)){
        //timer1 overflow interrupt
        TMR3CPND = BIT(16);
        tmrcnt = 110;                   //110ms overflow
    } else {
        return;
    }

//processing repeat code
    if (ir_cb.cnt == 32) {
        if ((tmrcnt >= 10) && (tmrcnt <= 12)) {
            //repeat code is simply 9ms+2.25ms
            ir_cb.rpt_cnt = 0;
        } else {
            ir_cb.rpt_cnt += tmrcnt;
            if (ir_cb.rpt_cnt > 108) {
                ir_cb.rpt_cnt = 0;
                ir_cb.cnt = 0;          //ir key release
            }
        }
        return;
    } else if ((tmrcnt > 7) || (tmrcnt == 0)) {     //A message is started by a 9ms AGC burst
        ir_cb.rpt_cnt = 0;
        ir_cb.cnt = 0;                  //ir key message started
        return;
    }

ir_cb.cmd >>= 1;
    ir_cb.cnt++;
    if (tmrcnt == 2) {                  //Bit time of 1.125ms(0) or 2.25ms(1)
        ir_cb.cmd |= 0x8000;
    }

if (ir_cb.cnt == 16) {
        ir_cb.addr = ir_cb.cmd;         //save address data
    } else if (ir_cb.cnt == 32) {
        //got ir key message
        if ((unsigned char)ir_cb.cmd > 96) {
            ir_cb.cmd = 0;
        }
        rt_kprintf("ir: %04x, %02x\n",ir_cb.addr, (unsigned char)ir_cb.cmd);
    }
}

void timer3_init(void)
{
    rt_hw_interrupt_install(IRQ_IRRX_VECTOR, irrx_isr, RT_NULL, "sw_ir_irq");
    TMR3CNT  = 0;
    TMR3PR   = TMR3_RCLK*110 - 1;                                //110ms Timer overflow interrupt
    TMR3CON  = BIT(8) | BIT(7) | BIT(5) | BIT(2) | BIT(1) | BIT(0);   //capture & overflow interrupt enable, falling edge, Capture Mode
}

void irrx_sw_init(void)
{
    IR_CAPTURE_PORT();
    FUNCMCON2 = TMR3CAP_MAPPING;                            //tmr3 g6  PE5
    rt_memset(&ir_cb, 0, sizeof(ir_cb));
    timer3_init();
}
`
```
#include <rtthread.h>
#include "board.h"

extern void irrx_sw_init(void);

int main(void)
{
    uint32_t cnt = 0;
    uint8_t pin = rt_pin_get("PE.1");

rt_pin_mode(pin, PIN_MODE_OUTPUT);
    rt_kprintf("Hello, world\n");
    irrx_sw_init();
    while (1)
    {
        if (cnt % 2 == 0) {
            rt_pin_write(pin, PIN_LOW);
        } else {
            rt_pin_write(pin, PIN_HIGH);
        }
        cnt++;
        rt_thread_mdelay(1000);
    }

return 0;
}
```

使用感受：
1、RT-Thread操作系统进发性好，稳定性好，方便进行二次开发。
2、中科蓝讯 AB32VG1资料齐全度就仁者见仁智者见智，建议不接触过的朋友就要直接绕路吧。
3、很大一部分功能函数已封装到库，并且使用说明含糊，芯片说明文档差，差评。
4、红外接收，timer时钟来源不清楚，寄存器使用说明不清楚，这是深度挖掘芯片性能的拦路虎。