REG_COM1
ret = ov7670_read(sd, REG_COM1, &com1) +
ret = ov7670_write(sd, REG_COM1, com1) +
{ REG_COM1, 0 }, /* CCIR601 */
{ REG_COM1, 0x0 }, /* CCIR601 */
{ REG_COM1, 0x0 }, /* CCIR601 */
ret = ov965x_write(ov965x, REG_COM1, exposure & 0x3);
ret = ov965x_read(ov965x, REG_COM1, ®0);