433 接收 + marvell

#include "gconf.h"
#include <mdev_wdt.h>
#include <mc200_driver.h>

static mdev_t *gpt3_dev = NULL;

#define SOF_HIGH_MAX    4900
#define SOF_HIGH_MIN    4700
#define SOF_LOW_MAX    1600
#define SOF_LOW_MIN    1400

#define LEVEL_0_MIN    300
#define LEVEL_0_MAX    500
#define LEVEL_1_MIN    600
#define LEVEL_1_MAX    800

#define MIN_SIZE_CODE    42

static volatile bool bTerminated = false;
static uint32_t data[8192];
static uint32_t idx_data = 0;


#define DUMP_WRAPAROUND 16
void dump_dec(const uint32_t *data, unsigned len)
{
    wmprintf("**** Dump @ 0x%x Len: %d ****\n\r", data, len);

    int i;
    for (i = 0; i < len;) {
        wmprintf("%8d ", data[i++]);
        if (!(i % DUMP_WRAPAROUND))
            wmprintf("\n\r");
    }

    wmprintf("\n\r******** End Dump *******\n\r");
}

static mdev_t *gpio_dev = NULL;
static uint32_t lasted_v = 0;
static bool bSOF = false;

static void edges_callback (int pin, void *arg);

static inline void check_capture(uint32_t value)
{
    if (!bSOF) {
        if (1 == GPIO_ReadPinLevel(IO_433_RECV))
        {
            idx_data = 0;

            if (((lasted_v > SOF_HIGH_MIN) && (lasted_v < SOF_HIGH_MAX)) && ((value > SOF_LOW_MIN) && (value < SOF_LOW_MAX)))
            {
                data[idx_data++] = lasted_v;
                data[idx_data++] = value ;
                bSOF = true;
            }
        }
    }
    else
    {
        if (((value > LEVEL_0_MIN) && (value < LEVEL_0_MAX)) || ((value > LEVEL_1_MIN) && (value < LEVEL_1_MAX))) {
            data[idx_data++] = value;
        }
        else {
            bSOF = false;
            data[idx_data++] = value;
        }

        if ((!bSOF && (idx_data >= MIN_SIZE_CODE) )|| (idx_data > 250)) {
            gpio_drv_set_cb(NULL, IO_433_RECV, GPIO_INT_DISABLE, NULL, NULL);
            dump_dec(data, idx_data);
            memset(data, 0, sizeof(data));
            idx_data = 0;
            lasted_v = 0;
            bSOF = false;
            gpio_drv_set_cb(NULL, IO_433_RECV, GPIO_INT_BOTH_EDGES, NULL, edges_callback);
        }
    }
}

static void edges_callback (int pin, void *arg)
{
    uint32_t value = GPT_GetCounterVal(GPT3_ID)/50; // -->> us
    gpt_drv_set(gpt3_dev, 0xFFFFFFFF/50);

    check_capture(value);
    lasted_v = value;
}

void waiting_RF433_info(void)
{
    WDT_Disable();
    //init
    PMU_PowerOnVDDIO(PMU_VDDIO_D0);

    //start hwtimer
    gpt_drv_init(GPT3_ID);
    gpt3_dev = gpt_drv_open(GPT3_ID);
    gpt_drv_set(gpt3_dev, 0xFFFFFFFF/50);
    gpt_drv_start(gpt3_dev);

    //set gpio callback.
    gpio_drv_init();
    gpio_drv_set_cb(NULL, IO_433_RECV, GPIO_INT_BOTH_EDGES, NULL, edges_callback);    //GPIO_INT_BOTH_EDGES, GPIO_INT_RISING_EDGE, GPIO_INT_FALLING_EDGE

    idx_data = 0;
    bSOF = false;
    lasted_v = 0;
    memset(data, 0, sizeof(data));

    gpio_dev = gpio_drv_open("MDEV_GPIO");
    gpio_drv_setdir(gpio_dev, IO_433_RECV, GPIO_INPUT);
    gpio_drv_close(gpio_dev);

    //WDT_Enable();

}

void start_rf433_recv_proc(void)
{
    dbg("Enter Recving ...");
    bTerminated = false;

    waiting_RF433_info();
}

void stop_rf433_recv_proc(void)
{
    dbg("Exit Recving ***");
    bTerminated = true;
}

开一个定时器， 在每次 IO的边沿触发时取出所有的时间， 判断是否引导头以及是否后续数据合适， 记入数据缓冲区即可。

**** Dump @ 0x20000934 Len: 82 ****
    4818     1502      358      726      368      726      358      727      364      716      365      723      372      717      366      718
     371      725      376      715      717      366      375      718      365      719      374      719      367      716      367      717
     375      733      714      368      722      373      716      374      363      725      713      367      375      749      718      376
     716      390      358      723      714      372      371      722      710      377      355      726      370      721      364      721
     720      382      361      723      367      716      375      712      723      372      367      721      364      724      361      722
     712    32610
******** End Dump *******
**** Dump @ 0x20000934 Len: 82 ****
    4830     1486      372      715      380      706      377      704      383      701      381      711      380      707      378      710
     376      731      374      705      726      363      382      715      371      707      381      701      382      709      380      706
     379      728      724      359      722      367      728      363      373      718      718      376      365      712      752      374
     716      388      360      720      720      374      363      718      719      378      360      721      370      719      363      718
     715      393      361      726      358      721      369      719      719      371      713      384      707      373      710      385
     359     9120
******** End Dump *******
**** Dump @ 0x20000934 Len: 82 ****
    4815     1501      356      738      351      725      363      724      360      730      358      729      355      725      366      722
     368      763      365      727      707      377      359      728      358      727      363      723      362      725      362      723
     364      734      715      381      708      377      711      389      352      727      708      389      343      734      708      388
     699      400      356      730      704      385      353      729      703      383      359      730      351      737      360      725
     706      405      346      733      355      735      355      727      704      383      699      394      695      393      698      390
     350     9153
******** End Dump *******