244 lines
5.9 KiB
C
244 lines
5.9 KiB
C
/*
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* Copyright 2012 Michael Ossmann
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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 <stdint.h>
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#include <libopencm3/lpc43xx/ssp.h>
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#include <libopencm3/lpc43xx/scu.h>
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#include <libopencm3/lpc43xx/gpio.h>
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#include "hackrf_core.h"
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#include "rffc5071.h"
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/* Set up pins for bit-banged serial interface. */
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void rffc5071_init(void)
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{
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/* Configure GPIO pins. */
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scu_pinmux(SCU_MIXER_ENX, SCU_GPIO_FAST);
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scu_pinmux(SCU_MIXER_SCLK, SCU_GPIO_FAST);
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scu_pinmux(SCU_MIXER_SDATA, SCU_GPIO_FAST);
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/* Set GPIO pins as outputs. */
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GPIO3_DIR |= (PIN_MIXER_ENX | PIN_MIXER_SCLK | PIN_MIXER_SDATA);
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/* set to known state */
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gpio_set(PORT_MIXER, PIN_MIXER_ENX); /* active low */
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gpio_clear(PORT_MIXER, (PIN_MIXER_SCLK | PIN_MIXER_SDATA));
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//FIXME hard coded setup, fields not broken out
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/* initial setup */
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rffc5071_reg_write(RFFC5071_P2_FREQ1, 0x0000);
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rffc5071_reg_write(RFFC5071_VCO_AUTO, 0xff00);
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rffc5071_reg_write(RFFC5071_CT_CAL1, 0xacbf);
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rffc5071_reg_write(RFFC5071_CT_CAL2, 0xacbf);
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rffc5071_reg_write(RFFC5071_TEST, 0x0005);
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/* set to be configured via 3-wire interface, not control pins */
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rffc5071_reg_write(RFFC5071_SDI_CTRL, 0x8000);
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//rffc5071_reg_write(MIX_CONT, 0xc800); /* full duplex */
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rffc5071_reg_write(RFFC5071_MIX_CONT, 0x4800); /* half duplex */
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}
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#define LO_MAX 5400
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#define REF_FREQ 50
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/* configure frequency synthesizer in integer mode (lo in MHz) */
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void rffc5071_config_synth_int(uint16_t lo) {
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uint8_t n_lo;
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uint8_t lodiv;
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uint16_t fvco;
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uint8_t fbkdiv;
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uint16_t n;
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/* n_lo = int(log2(LO_MAX/lo)) */
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for (n_lo = 0; n_lo < 5; n_lo++)
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if ((2 << n_lo) > (LO_MAX / lo))
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break;
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lodiv = 1 << n_lo;
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fvco = lodiv * lo;
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if (fvco > 3200) {
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fbkdiv = 4;
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/* set charge pump for VCO > 3.2 GHz */
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rffc5071_reg_write(RFFC5071_LF, 0xbefb);
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} else {
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fbkdiv = 2;
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}
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n = (fvco / fbkdiv) / REF_FREQ;
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rffc5071_reg_write(RFFC5071_P1_FREQ1,
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(n << 7) | (n_lo << 4) | (fbkdiv << 1));
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rffc5071_reg_write(RFFC5071_P1_FREQ2, 0x0000);
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rffc5071_reg_write(RFFC5071_P1_FREQ3, 0x0000);
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}
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void rffc5071_enable_tx(void) {
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rffc5071_reg_write(RFFC5071_SDI_CTRL, 0xc000); /* mixer 1 (TX) */
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}
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void rffc5071_enable_rx(void) {
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rffc5071_reg_write(RFFC5071_SDI_CTRL, 0xe000); /* mixer 2 (RX) */
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}
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void serial_delay(void)
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{
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uint32_t i;
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for (i = 0; i < 1000; i++)
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__asm__("nop");
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}
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/*
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* Send 25 bits:
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* first bit is ignored,
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* second bit is zero for write operation,
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* next 7 bits are register address,
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* next 16 bits are register value.
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*/
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void rffc5071_reg_write(uint8_t reg, uint16_t val)
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{
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int bits = 25;
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int msb = 1 << (bits -1);
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uint32_t data = ((reg & 0x7f) << 16) | val;
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/* make sure everything is starting in the correct state */
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gpio_set(PORT_MIXER, PIN_MIXER_ENX);
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gpio_clear(PORT_MIXER, (PIN_MIXER_SCLK | PIN_MIXER_SDATA));
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/*
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* The device requires two clocks while ENX is high before a serial
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* transaction. This is not clearly documented.
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*/
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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/* start transaction by bringing ENX low */
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gpio_clear(PORT_MIXER, PIN_MIXER_ENX);
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while (bits--) {
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if (data & msb)
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gpio_set(PORT_MIXER, PIN_MIXER_SDATA);
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else
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gpio_clear(PORT_MIXER, PIN_MIXER_SDATA);
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data <<= 1;
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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}
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_ENX);
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}
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/*
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* Send 9 bits:
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* first bit is ignored,
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* second bit is one for read operation,
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* next 7 bits are register address.
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* Then receive 16 bits (register value).
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*/
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uint16_t rffc5071_reg_read(uint8_t reg)
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{
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int bits = 9;
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int msb = 1 << (bits -1);
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uint32_t data = 0x80 | (reg & 0x7f);
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/* make sure everything is starting in the correct state */
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gpio_set(PORT_MIXER, PIN_MIXER_ENX);
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gpio_clear(PORT_MIXER, (PIN_MIXER_SCLK | PIN_MIXER_SDATA));
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/*
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* The device requires two clocks while ENX is high before a serial
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* transaction. This is not clearly documented.
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*/
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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/* start transaction by bringing ENX low */
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gpio_clear(PORT_MIXER, PIN_MIXER_ENX);
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while (bits--) {
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if (data & msb)
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gpio_set(PORT_MIXER, PIN_MIXER_SDATA);
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else
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gpio_clear(PORT_MIXER, PIN_MIXER_SDATA);
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data <<= 1;
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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}
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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bits = 16;
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data = 0;
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/* set SDATA line as input */
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GPIO3_DIR &= ~PIN_MIXER_SDATA;
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while (bits--) {
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data <<= 1;
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_SCLK);
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serial_delay();
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gpio_clear(PORT_MIXER, PIN_MIXER_SCLK);
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if (MIXER_SDATA_STATE)
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data |= 1;
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}
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/* set SDATA line as output */
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GPIO3_DIR |= PIN_MIXER_SDATA;
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serial_delay();
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gpio_set(PORT_MIXER, PIN_MIXER_ENX);
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return data;
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}
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