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/*
* Copyright 2012-2022 Great Scott Gadgets <info@greatscottgadgets.com>
* Copyright 2012 Will Code <willcode4@gmail.com>
* Copyright 2014 Jared Boone <jared@sharebrained.com>
*
* This file is part of HackRF.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "max2837_target.h"
#include <libopencm3/lpc43xx/scu.h>
#include "hackrf_core.h"
void max2837_target_init(max2837_driver_t* const drv)
{
/* Configure SSP1 Peripheral (to be moved later in SSP driver) */
scu_pinmux(SCU_SSP1_CIPO, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
scu_pinmux(SCU_SSP1_COPI, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
scu_pinmux(SCU_SSP1_SCK, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
scu_pinmux(SCU_XCVR_CS, SCU_GPIO_FAST);
/* Configure XCVR_CTL GPIO pins. */
scu_pinmux(SCU_XCVR_ENABLE, SCU_GPIO_FAST);
scu_pinmux(SCU_XCVR_RXENABLE, SCU_GPIO_FAST);
scu_pinmux(SCU_XCVR_TXENABLE, SCU_GPIO_FAST);
/* Set GPIO pins as outputs. */
gpio_output(drv->gpio_enable);
gpio_output(drv->gpio_rx_enable);
gpio_output(drv->gpio_tx_enable);
}
void max2837_target_set_mode(max2837_driver_t* const drv, const max2837_mode_t new_mode)
{
/* MAX2837_MODE_SHUTDOWN:
* All circuit blocks are powered down, except the 4-wire serial bus
* and its internal programmable registers.
*
* MAX2837_MODE_STANDBY:
* Used to enable the frequency synthesizer block while the rest of the
* device is powered down. In this mode, PLL, VCO, and LO generator
* are on, so that Tx or Rx modes can be quickly enabled from this mode.
* These and other blocks can be selectively enabled in this mode.
*
* MAX2837_MODE_TX:
* All Tx circuit blocks are powered on. The external PA is powered on
* after a programmable delay using the on-chip PA bias DAC. The slow-
* charging Rx circuits are in a precharged “idle-off” state for fast
* Tx-to-Rx turnaround time.
*
* MAX2837_MODE_RX:
* All Rx circuit blocks are powered on and active. Antenna signal is
* applied; RF is downconverted, filtered, and buffered at Rx BB I and Q
* outputs. The slow- charging Tx circuits are in a precharged “idle-off”
* state for fast Rx-to-Tx turnaround time.
*/
gpio_write(drv->gpio_enable, new_mode != MAX2837_MODE_SHUTDOWN);
gpio_write(drv->gpio_rx_enable, new_mode == MAX2837_MODE_RX);
gpio_write(drv->gpio_tx_enable, new_mode == MAX2837_MODE_TX);
drv->mode = new_mode;
}
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