3 * Copyright 2008,2009 Free Software Foundation, Inc.
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 #include <memory_map.h>
22 #include <usrp2_i2c_addr.h>
30 struct db_base *rx_dboard; // the rx daughterboard that's installed
31 struct db_base *tx_dboard; // the tx daughterboard that's installed
33 extern struct db_base db_basic_tx;
34 extern struct db_base db_basic_rx;
35 extern struct db_base db_lf_tx;
36 extern struct db_base db_lf_rx;
37 extern struct db_base db_bitshark_rx;
39 struct db_base *all_dboards[] = {
49 typedef enum { UDBE_OK, UDBE_NO_EEPROM, UDBE_INVALID_EEPROM } usrp_dbeeprom_status_t;
51 static usrp_dbeeprom_status_t
52 read_raw_dboard_eeprom (unsigned char *buf, int i2c_addr)
54 if (!eeprom_read (i2c_addr, 0, buf, DB_EEPROM_CLEN))
55 return UDBE_NO_EEPROM;
57 if (buf[DB_EEPROM_MAGIC] != DB_EEPROM_MAGIC_VALUE)
58 return UDBE_INVALID_EEPROM;
62 for (i = 0; i < DB_EEPROM_CLEN; i++)
65 if ((sum & 0xff) != 0)
66 return UDBE_INVALID_EEPROM;
73 * Return DBID, -1 <none> or -2 <invalid eeprom contents>
76 read_dboard_eeprom(int i2c_addr)
78 unsigned char buf[DB_EEPROM_CLEN];
80 usrp_dbeeprom_status_t s = read_raw_dboard_eeprom (buf, i2c_addr);
82 //printf("\nread_raw_dboard_eeprom: %d\n", s);
86 return (buf[DB_EEPROM_ID_MSB] << 8) | buf[DB_EEPROM_ID_LSB];
92 case UDBE_INVALID_EEPROM:
98 static struct db_base *
105 for (i = 0; all_dboards[i]; i++)
106 if (all_dboards[i]->dbid == dbid)
107 return all_dboards[i];
112 static struct db_base *
113 lookup_dboard(int i2c_addr, struct db_base *default_db, char *msg)
116 int dbid = read_dboard_eeprom(i2c_addr);
118 // FIXME removing this printf has the system hang if there are two d'boards
119 // installed. (I think the problem is in i2c_read/write or the way
120 // I kludge the zero-byte write to set the read address in eeprom_read.)
121 printf("%s dbid: 0x%x\n", msg, dbid);
123 if (dbid < 0){ // there was some kind of problem. Treat as Basic Tx
126 else if ((db = lookup_dbid(dbid)) == 0){
127 printf("No daugherboard code for dbid = 0x%x\n", dbid);
134 set_atr_regs(int bank, struct db_base *db)
141 val[ATR_IDLE] = db->atr_rxval;
142 val[ATR_RX] = db->atr_rxval;
143 val[ATR_TX] = db->atr_txval;
144 val[ATR_FULL] = db->atr_txval;
146 if (bank == GPIO_TX_BANK){
155 for (i = 0; i < 4; i++){
156 int t = (atr_regs->v[i] & ~mask) | ((val[i] << shift) & mask);
157 //printf("atr_regs[%d] = 0x%x\n", i, t);
163 set_gpio_mode(int bank, struct db_base *db)
167 hal_gpio_set_ddr(bank, db->output_enables, 0xffff);
168 set_atr_regs(bank, db);
170 for (i = 0; i < 16; i++){
171 if (db->used_pins & (1 << i)){
172 // set to either GPIO_SEL_SW or GPIO_SEL_ATR
173 hal_gpio_set_sel(bank, i, (db->atr_mask & (1 << i)) ? 'a' : 's');
178 static int __attribute__((unused))
179 determine_tx_mux_value(struct db_base *db)
181 if (db->i_and_q_swapped)
188 determine_rx_mux_value(struct db_base *db)
194 static int truth_table[8] = {
196 /* 0, 0x0 */ (ZERO << 2) | ZERO, // N/A
197 /* 0, 0x1 */ (ZERO << 2) | ADC0,
198 /* 0, 0x2 */ (ZERO << 2) | ADC1,
199 /* 0, 0x3 */ (ADC1 << 2) | ADC0,
200 /* 1, 0x0 */ (ZERO << 2) | ZERO, // N/A
201 /* 1, 0x1 */ (ZERO << 2) | ADC0,
202 /* 1, 0x2 */ (ZERO << 2) | ADC1,
203 /* 1, 0x3 */ (ADC0 << 2) | ADC1,
210 if (db->is_quadrature)
211 subdev0_uses = 0x3; // uses A/D 0 and 1
213 subdev0_uses = 0x1; // uses A/D 0 only
215 // FIXME second subdev on Basic Rx, LF RX
217 // subdev1_uses = 0x2;
222 int swap_iq = db->i_and_q_swapped & 0x1;
223 int index = (swap_iq << 2) | uses;
225 return truth_table[index];
234 tx_dboard = lookup_dboard(I2C_ADDR_TX_A, &db_basic_tx, "Tx");
235 //printf("db_init: tx dbid = 0x%x\n", tx_dboard->dbid);
236 set_gpio_mode(GPIO_TX_BANK, tx_dboard);
237 tx_dboard->init(tx_dboard);
238 m = determine_tx_mux_value(tx_dboard);
239 dsp_tx_regs->tx_mux = m;
240 //printf("tx_mux = 0x%x\n", m);
241 tx_dboard->current_lo_offset = tx_dboard->default_lo_offset;
243 rx_dboard = lookup_dboard(I2C_ADDR_RX_A, &db_basic_rx, "Rx");
244 //printf("db_init: rx dbid = 0x%x\n", rx_dboard->dbid);
245 set_gpio_mode(GPIO_RX_BANK, rx_dboard);
246 rx_dboard->init(rx_dboard);
247 m = determine_rx_mux_value(rx_dboard);
248 dsp_rx_regs->rx_mux = m;
249 //printf("rx_mux = 0x%x\n", m);
250 rx_dboard->current_lo_offset = rx_dboard->default_lo_offset;
254 * Calculate the frequency to use for setting the digital down converter.
256 * \param[in] target_freq desired RF frequency (Hz)
257 * \param[in] baseband_freq the RF frequency that corresponds to DC in the IF.
259 * \param[out] dxc_freq is the value for the ddc
260 * \param[out] inverted is true if we're operating in an inverted Nyquist zone.
263 calc_dxc_freq(u2_fxpt_freq_t target_freq, u2_fxpt_freq_t baseband_freq,
264 u2_fxpt_freq_t *dxc_freq, bool *inverted)
266 u2_fxpt_freq_t fs = U2_DOUBLE_TO_FXPT_FREQ(100e6); // converter sample rate
267 u2_fxpt_freq_t delta = target_freq - baseband_freq;
270 printf("calc_dxc_freq\n");
271 printf(" fs = "); print_fxpt_freq(fs); newline();
272 printf(" target = "); print_fxpt_freq(target_freq); newline();
273 printf(" baseband = "); print_fxpt_freq(baseband_freq); newline();
274 printf(" delta = "); print_fxpt_freq(delta); newline();
280 if (delta <= fs/2){ // non-inverted region
284 else { // inverted region
285 *dxc_freq = delta - fs;
292 if (delta >= -fs/2){ // non-inverted region
296 else { // inverted region
297 *dxc_freq = delta + fs;
304 db_set_lo_offset(struct db_base *db, u2_fxpt_freq_t offset)
306 db->current_lo_offset = offset;
311 db_tune(struct db_base *db, u2_fxpt_freq_t target_freq, struct tune_result *result)
313 memset(result, 0, sizeof(*result));
314 bool inverted = false;
315 u2_fxpt_freq_t dxc_freq;
316 u2_fxpt_freq_t actual_dxc_freq;
318 // Ask the d'board to tune as closely as it can to target_freq+lo_offset
319 bool ok = db->set_freq(db, target_freq+db->current_lo_offset, &result->baseband_freq);
321 // Calculate the DDC setting that will downconvert the baseband from the
322 // daughterboard to our target frequency.
323 calc_dxc_freq(target_freq, result->baseband_freq, &dxc_freq, &inverted);
325 // If the spectrum is inverted, and the daughterboard doesn't do
326 // quadrature downconversion, we can fix the inversion by flipping the
327 // sign of the dxc_freq... (This only happens using the basic_rx board)
329 if (db->spectrum_inverted)
330 inverted = !inverted;
332 if (inverted && !db->is_quadrature){
333 dxc_freq = -dxc_freq;
334 inverted = !inverted;
338 dxc_freq = -dxc_freq; // down conversion versus up conversion
339 ok &= db_set_duc_freq(dxc_freq, &actual_dxc_freq);
342 ok &= db_set_ddc_freq(dxc_freq, &actual_dxc_freq);
345 result->dxc_freq = dxc_freq;
346 result->residual_freq = dxc_freq - actual_dxc_freq;
347 result->inverted = inverted;
352 compute_freq_control_word(u2_fxpt_freq_t target_freq, u2_fxpt_freq_t *actual_freq)
354 // If we were using floating point, we'd calculate
356 // v = (int) rint(target_freq / master_freq) * pow(2.0, 32.0);
358 //printf("compute_freq_control_word\n");
359 //printf(" target_freq = "); print_fxpt_freq(target_freq); newline();
361 int32_t master_freq = 100000000; // 100M
363 int32_t v = ((target_freq << 12)) / master_freq;
364 //printf(" fcw = %d\n", v);
366 *actual_freq = (v * (int64_t) master_freq) >> 12;
368 //printf(" actual = "); print_fxpt_freq(*actual_freq); newline();
375 db_set_ddc_freq(u2_fxpt_freq_t dxc_freq, u2_fxpt_freq_t *actual_dxc_freq)
377 int32_t v = compute_freq_control_word(dxc_freq, actual_dxc_freq);
378 dsp_rx_regs->freq = v;
383 db_set_duc_freq(u2_fxpt_freq_t dxc_freq, u2_fxpt_freq_t *actual_dxc_freq)
385 int32_t v = compute_freq_control_word(dxc_freq, actual_dxc_freq);
386 dsp_tx_regs->freq = v;
391 db_set_gain(struct db_base *db, u2_fxpt_gain_t gain)
393 return db->set_gain(db, gain);
397 db_set_antenna(struct db_base *db, int ant)
399 if (db->set_antenna == 0) return false;
400 return db->set_antenna(db, ant);