TX_CONTROL
*(uint8_t *)((char *)ri->ri_hw + TX_CONTROL) &= ~0x40;
*(uint8_t *)((char *)ri->ri_hw + TX_CONTROL) |= 0x40;
*(uint8_t *)(base + TX_CONTROL) &= ~0x40;
*(uint8_t *)(base + TX_CONTROL) &= ~0x40; /* !? Eeeh !? */
*(uint8_t *)(base + TX_CONTROL) |= 0x40;