BladeRF 10MHz Clock Output

main.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <libbladeRF.h>

#define KNRM "\x1B[0m"
#define KRED "\x1B[31m"
#define KGRN "\x1B[32m"

int main(int argc, char* argv[])
{
    int i, result;
    struct bladerf* dev = NULL;
    struct bladerf_devinfo* devices = NULL;

    /* f_vco = 38.4MHz * 66 */
    /* 10MHz = f_vco / 253.44 */
    /* 253.44 = 254 + 44/100 */
    uint32_t a = 253, b = 44, c = 100;
    uint32_t p1, p2, p3;
    uint8_t regs[10];
    uint64_t temp;

    (void)argc;
    (void)argv;

    temp = (uint64_t)a * c + b;
    temp *= 128;
    temp /= c;
    temp -= 512;
    p1 = temp;
    temp = (uint64_t)b * 128;
    temp %= c;
    p2 = temp;

    p3 = c;

    regs[0] = ((p1 >>  0) & 0xff);
    regs[1] = ((p1 >>  8) & 0xff);
    regs[2] = ((p1 >> 16) & 0x03) | (p2 & 0x3f) << 2;
    regs[3] = ((p2 >>  6) & 0xff);
    regs[4] = ((p2 >> 14) & 0xff);
    regs[5] = ((p2 >> 22) & 0xff);
    regs[6] = ((p3 >>  0) & 0xff);
    regs[7] = ((p3 >>  8) & 0xff);
    regs[8] = ((p3 >> 16) & 0xff);
    regs[9] = ((p3 >> 24) & 0x3f);
    

    printf("%-50s", "Searching for BladeRFs...");
    fflush(stdout);
    result = bladerf_get_device_list(&devices);
    if(result < 0) goto error;
    else printf(KGRN "OK" KNRM "\n");
    
    if(result == 0) {
        printf("No BladeRFs found, exiting.\n");
        return 1;
    } else for(i=0; i<result; i++) {
        printf("Found BladeRF[%d]:\n", i);
        printf("    Backend: %s\n", bladerf_backend_str(devices[i].backend));
        printf("    Serial: %s\n", devices[i].serial);
        printf("    USB: %X:%X\n", devices[i].usb_bus, devices[i].usb_addr);
        printf("    Instance ID: %d\n", devices[i].instance);
    }
    
    printf("%-50s", "Opening device 0...");
    fflush(stdout);
    result = bladerf_open_with_devinfo(&dev, &devices[0]);
    if(result < 0) goto error;
    printf(KGRN "OK" KNRM "\n");

    printf("%-50s", "Setting MS3 to 10MHz output...");
    fflush(stdout);
    for(i=0; i<10; i++) {
        result = bladerf_si5338_write(dev, 86+i, regs[i]);
        if(result < 0) goto error;
    }
    printf(KGRN "OK" KNRM "\n");

    printf("%-50s", "Enabling CLK3A...");
    fflush(stdout);
    result = bladerf_si5338_write(dev, 39, 0x01);
    if(result < 0) goto error;
    printf(KGRN "OK" KNRM "\n");

    printf("%-50s", "Enabling MS3 on CLK3A...");
    fflush(stdout);
    result = bladerf_si5338_write(dev, 34, 0xC0);
    if(result < 0) goto error;
    printf(KGRN "OK" KNRM "\n");

    printf("Done, exiting.\n");
    result = 0;
    goto cleanup;

    error:
    printf(KRED "ERR" KNRM "\nBladeRF Error: %d %s\n",
           result, bladerf_strerror(result));
    result = 1;

    cleanup:
    bladerf_close(dev);
    bladerf_free_device_list(devices);

    return result;
}

Makefile

all:
	gcc -g -c main.c -Wall -Werror -Wpedantic
	gcc -g main.o -lpthread -lm -lbladeRF -Wall -Werror -Wpedantic -o bladerf-10mhz