HC_REG_COMMAND_REG
reg_addr = (HC_REG_COMMAND_REG + port*32 + COMMAND_REG_ATTN_BITS_SET);
reg_addr = (HC_REG_COMMAND_REG + port*32 +
uint32_t hc_addr = (HC_REG_COMMAND_REG + SC_PORT(sc)*32 +
uint32_t hc_addr = (HC_REG_COMMAND_REG + SC_PORT(sc)*32 +