GPIO_16 点灯

#define DELAY 100
int val = 0;
int LED = 16;
int main() {
    gpio_init(LED);
    gpio_set_dir(LED,GPIO_OUT);
    while (1) {
        if (getchar_timeout_us(0) == 3) break;
        val = val?0:1;
        gpio_put(LED,val);
        sleep_ms(DELAY);
    }
    return 0;
}

Button ISR

当按下某一个按钮处理其中断，并做一些特殊的事情如脱机烧录。 下面示例完成烧录 RP2040 的功能

#define BTN_UP_12    12
#define BTN_DOWN_23  23

int curr_key = 0;

int gpio_callback(int num){
    curr_key = get_curr_key();
    return 0;
}

int main(){
    reg_gpio_hook(gpio_callback);
    lvgl_text("*PUSH BTN TO FLASH*");

    while(1){
        if(curr_key){
            printf("key %d down\r\n",curr_key);
            if(curr_key == BTN_UP_12){
                lvgl_text("TRY FLASH....");

                flash("rp2040","/upload/rp2040_blink.bin");
                
                lvgl_text("FINISHED");
            }
            curr_key = 0 ;
        }
        sleep_ms_v(100);
        if (getchar_timeout_us(0) == 3){ // CTRL + C
            unreg_gpio_hook(gpio_callback);
            break;
        }
    }
    return 0;
}

I2C SCAN

当按下某一个按钮 扫描 I2C 总线

 


#define BTN_UP_12    12
#define BTN_DOWN_23  23


#define CLK_PIN    5
#define SDA_PIN    4

int gpio_1   = 10;
int gpio_2   = 11;
int curr_key = 0;

int i2c_devs[4] ;


int gpio_callback(int num){
    curr_key = get_curr_key();
    return 0;
}


int scan_addrs(){

    int num     = 0;
    char rxdata;
    int addr =  0;
    int ret  = -1;


    for (addr = 0; addr < (1 << 7); ++addr) {
        ret = -1;
        if ((addr & 0x78) == 0 || (addr & 0x78) == 0x78) continue;
/*
PICO_ERROR_NONE = 0,    
PICO_ERROR_GENERIC = -1,
PICO_ERROR_TIMEOUT = -2,
PICO_ERROR_NO_DATA = -3,
*/
        ret = i2c_read_timeout_us(i2c0, addr, &rxdata, 1, false,20*1000);
        if(ret>=0){
            i2c_devs[num++] = addr;
        }
        // printf("try read:%d :%d\r\n",addr,ret);
        if(num >=2) break;
    }


    printf("Found %d Devices\r\n",num);

    gpio_put(gpio_1,num >=2?1:0);
    gpio_put(gpio_2,num >=2?0:1);

    return num;

}   



int main(){

    int ret = 0;
    int i   = 0;

    httpd();

    reg_gpio_hook(gpio_callback);
    lvgl_text("*PUSH BTN TO SCAN*");

    char strMsg[32];

    i2c_init(i2c0, 100 * 1000);//Speed 100k
    gpio_set_function(SDA_PIN, GPIO_FUNC_I2C);//I2C0_SDA
    gpio_set_function(CLK_PIN, GPIO_FUNC_I2C);//I2C0_SCL
    gpio_pull_up(CLK_PIN);
    gpio_pull_up(SDA_PIN);


    gpio_init(gpio_1);gpio_set_dir(gpio_1, GPIO_OUT);gpio_put(gpio_1,0);
    gpio_init(gpio_2);gpio_set_dir(gpio_2, GPIO_OUT);gpio_put(gpio_2,0);


    while(1){
        if(curr_key){
            if(curr_key == BTN_UP_12){
                lvgl_text("TRY SCAN....");

                ret = scan_addrs();strMsg[0]=0;
                
                sprintf(strMsg,"Found %d Devs",ret);
                lvgl_text(strMsg);
            }
            curr_key = 0 ;
        }
        sleep_ms_v(100);
        if (getchar_timeout_us(0) == 3){ // CTRL + C
            unreg_gpio_hook(gpio_callback);
            break;
        }
    }
    return 0;

}

I2C Sniffer

#define BTN_UP_12    12
#define BTN_DOWN_23  23
#define CTRL_C  3


#define EV_DATA 0
#define EV_START 1
#define EV_STOP 3


int main(){
    i2c_sniffer_init();
    int i = 0;
    int nNum = 0;

    int buff[32];
    while(1){

        nNum = i2c_sniffer_peek();
        if(nNum <=0){
            sleep_ms_v(100);
            if (getchar_timeout_us(0) == CTRL_C){
                i2c_sniffer_deinit();
                return 0;
            }
            continue;
        }
        nNum = i2c_sniffer_read((int)&buff[0],32*4,0);
        

        for(i=0;i<nNum/4;i++){
            int msg = buff[i];
            /*
            第1字节为数据或 I2C 地址
            第4字节 
                bit0  ACK;  
                bit1  R/W;
                bit[2-7] 消息类型；
            */

            int Byte3= msg >> 24;
            int data = msg &0xff;
            
            int type = Byte3 >>6;
            int RW   = Byte3&0x2?1:0;
            int ACK  = Byte3&0x1?1:0;

            if(type == EV_START){
                printf("\r\nS%02x%s%s :",data,RW?"R":"W",ACK?"N":"A");
            }else if(type == EV_DATA){
                printf("%02x ",data);
            }else if(type == EV_STOP){
                printf("P");
            }
        }

    }
    return 0;
}