Hello,
I am a new USRP user with a question about how the GPIO functions. Are the
front panel and daughterboard GPIO separate entities?
For instance, if I set the transmit to be always enabled on the
daughterboard ATR registers
uint32_t old_atr_idle_val =
tx_db_iface->get_atr_reg(uhd::usrp::dboard_iface::UNIT_TX,
uhd::usrp::gpio_atr::ATR_REG_IDLE);
uint32_t old_atr_rxo_val =
tx_db_iface->get_atr_reg(uhd::usrp::dboard_iface::UNIT_TX,
uhd::usrp::gpio_atr::ATR_REG_RX_ONLY);
uint32_t new_atr_val = 0;
uint32_t mask = 0x20; //bit 5 = tx not enabled (ie 0 -> always enable
Tx)
tx_db_iface->set_atr_reg(uhd::usrp::dboard_iface::UNIT_TX,
uhd::usrp::gpio_atr::ATR_REG_IDLE, new_atr_val, mask);
tx_db_iface->set_atr_reg(uhd::usrp::dboard_iface::UNIT_TX,
uhd::usrp::gpio_atr::ATR_REG_RX_ONLY, new_atr_val, mask);
Will setting the front panel ATR to change a GPIO when I start streaming
function as normal, or will the pin always stay high?
//GPIO[2] = ATR output 1 during TX
ctrl |= GPIO_BIT(2);
ddr |= GPIO_BIT(2);
atr_tx |= GPIO_BIT(2);
//set data direction register (DDR)
mpUsrp->set_gpio_attr(gpio, "DDR", ddr, mask);
//set control register
mpUsrp->set_gpio_attr(gpio, "CTRL", ctrl, mask);
//set output values (OUT)
mpUsrp->set_gpio_attr(gpio, "OUT", out, mask);
mpUsrp->set_gpio_attr(gpio, "ATR_TX", atr_tx, mask);
Thank you!
Richard
smime.p7s
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