99 lines
3.3 KiB
C
99 lines
3.3 KiB
C
/*
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* Copyright 2012-2022 Great Scott Gadgets
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* Copyright 2014 Jared Boone <jared@sharebrained.com>
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* Copyright 2012 Will Code <willcode4@gmail.com>
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*
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* This file is part of HackRF.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#include "max2839_target.h"
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#include <libopencm3/lpc43xx/scu.h>
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#include "hackrf_core.h"
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void max2839_target_init(max2839_driver_t* const drv)
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{
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/* Configure SSP1 Peripheral (to be moved later in SSP driver) */
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scu_pinmux(SCU_SSP1_CIPO, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
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scu_pinmux(SCU_SSP1_COPI, (SCU_SSP_IO | SCU_CONF_FUNCTION5));
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scu_pinmux(SCU_SSP1_SCK, (SCU_SSP_IO | SCU_CONF_FUNCTION1));
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scu_pinmux(SCU_XCVR_CS, SCU_GPIO_FAST);
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/*
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* Configure XCVR_CTL GPIO pins.
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*
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* The RXTX pin is also known as RXENABLE because of its use on the
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* MAX2837 which had a separate TXENABLE. On MAX2839 a single RXTX pin
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* switches between RX (high) and TX (low) modes.
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*/
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scu_pinmux(SCU_XCVR_ENABLE, SCU_GPIO_FAST);
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scu_pinmux(SCU_XCVR_RXENABLE, SCU_GPIO_FAST);
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/* Set GPIO pins as outputs. */
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gpio_output(drv->gpio_enable);
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gpio_output(drv->gpio_rxtx);
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}
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void max2839_target_set_mode(max2839_driver_t* const drv, const max2839_mode_t new_mode)
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{
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/* MAX2839_MODE_SHUTDOWN:
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* All circuit blocks are powered down, except the 4-wire serial bus
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* and its internal programmable registers.
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*
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* MAX2839_MODE_STANDBY:
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* Used to enable the frequency synthesizer block while the rest of the
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* device is powered down. In this mode, PLL, VCO, and LO generator
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* are on, so that Tx or Rx modes can be quickly enabled from this mode.
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* These and other blocks can be selectively enabled in this mode.
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*
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* MAX2839_MODE_TX:
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* All Tx circuit blocks are powered on. The external PA is powered on
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* after a programmable delay using the on-chip PA bias DAC. The slow-
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* charging Rx circuits are in a precharged “idle-off” state for fast
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* Tx-to-Rx turnaround time.
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*
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* MAX2839_MODE_RX:
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* All Rx circuit blocks are powered on and active. Antenna signal is
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* applied; RF is downconverted, filtered, and buffered at Rx BB I and Q
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* outputs. The slow- charging Tx circuits are in a precharged “idle-off”
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* state for fast Rx-to-Tx turnaround time.
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*/
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switch (new_mode) {
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default:
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case MAX2839_MODE_SHUTDOWN:
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gpio_clear(drv->gpio_enable);
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gpio_clear(drv->gpio_rxtx);
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break;
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case MAX2839_MODE_STANDBY:
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gpio_clear(drv->gpio_enable);
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gpio_set(drv->gpio_rxtx);
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break;
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case MAX2839_MODE_TX:
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gpio_set(drv->gpio_enable);
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gpio_clear(drv->gpio_rxtx);
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break;
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case MAX2839_MODE_RX:
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gpio_set(drv->gpio_enable);
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gpio_set(drv->gpio_rxtx);
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break;
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}
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drv->mode = new_mode;
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}
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