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>
31 struct db_base *tx_dboard; // the tx daughterboard that's installed
32 struct db_base *rx_dboard; // the rx daughterboard that's installed
34 extern struct db_base db_basic_tx;
35 extern struct db_base db_basic_rx;
36 extern struct db_base db_lf_tx;
37 extern struct db_base db_lf_rx;
38 extern struct db_base db_wbxng_rx;
39 extern struct db_base db_wbxng_tx;
41 struct db_base *all_dboards[] = {
52 typedef enum { UDBE_OK, UDBE_NO_EEPROM, UDBE_INVALID_EEPROM } usrp_dbeeprom_status_t;
54 static usrp_dbeeprom_status_t
55 read_raw_dboard_eeprom (unsigned char *buf, int i2c_addr)
57 if (!eeprom_read (i2c_addr, 0, buf, DB_EEPROM_CLEN))
58 return UDBE_NO_EEPROM;
60 if (buf[DB_EEPROM_MAGIC] != DB_EEPROM_MAGIC_VALUE)
61 return UDBE_INVALID_EEPROM;
65 for (i = 0; i < DB_EEPROM_CLEN; i++)
68 if ((sum & 0xff) != 0)
69 return UDBE_INVALID_EEPROM;
76 * Return DBID, -1 <none> or -2 <invalid eeprom contents>
79 read_dboard_eeprom(int i2c_addr)
81 unsigned char buf[DB_EEPROM_CLEN];
83 usrp_dbeeprom_status_t s = read_raw_dboard_eeprom (buf, i2c_addr);
85 //printf("\nread_raw_dboard_eeprom: %d\n", s);
89 return (buf[DB_EEPROM_ID_MSB] << 8) | buf[DB_EEPROM_ID_LSB];
95 case UDBE_INVALID_EEPROM:
101 static struct db_base *
102 lookup_dbid(int dbid)
108 for (i = 0; all_dboards[i]; i++)
109 if (all_dboards[i]->dbid == dbid)
110 return all_dboards[i];
115 static struct db_base *
116 lookup_dboard(int i2c_addr, struct db_base *default_db, char *msg)
119 int dbid = read_dboard_eeprom(i2c_addr);
121 // FIXME removing this printf has the system hang if there are two d'boards
122 // installed. (I think the problem is in i2c_read/write or the way
123 // I kludge the zero-byte write to set the read address in eeprom_read.)
124 printf("%s dbid: 0x%x\n", msg, dbid);
126 if (dbid < 0){ // there was some kind of problem. Treat as Basic Tx
129 else if ((db = lookup_dbid(dbid)) == 0){
130 printf("No daugherboard code for dbid = 0x%x\n", dbid);
137 set_atr_regs(int bank, struct db_base *db)
144 val[ATR_IDLE] = db->atr_rxval;
145 val[ATR_RX] = db->atr_rxval;
146 val[ATR_TX] = db->atr_txval;
147 val[ATR_FULL] = db->atr_txval;
149 if (bank == GPIO_TX_BANK){
158 for (i = 0; i < 4; i++){
159 int t = (atr_regs->v[i] & ~mask) | ((val[i] << shift) & mask);
160 //printf("atr_regs[%d] = 0x%x\n", i, t);
166 set_gpio_mode(int bank, struct db_base *db)
170 hal_gpio_set_ddr(bank, db->output_enables, 0xffff);
171 set_atr_regs(bank, db);
173 for (i = 0; i < 16; i++){
174 if (db->used_pins & (1 << i)){
175 // set to either GPIO_SEL_SW or GPIO_SEL_ATR
176 hal_gpio_set_sel(bank, i, (db->atr_mask & (1 << i)) ? 'a' : 's');
181 static int __attribute__((unused))
182 determine_tx_mux_value(struct db_base *db)
184 if (db->i_and_q_swapped)
191 determine_rx_mux_value(struct db_base *db)
197 static int truth_table[8] = {
199 /* 0, 0x0 */ (ZERO << 2) | ZERO, // N/A
200 /* 0, 0x1 */ (ZERO << 2) | ADC0,
201 /* 0, 0x2 */ (ZERO << 2) | ADC1,
202 /* 0, 0x3 */ (ADC1 << 2) | ADC0,
203 /* 1, 0x0 */ (ZERO << 2) | ZERO, // N/A
204 /* 1, 0x1 */ (ZERO << 2) | ADC0,
205 /* 1, 0x2 */ (ZERO << 2) | ADC1,
206 /* 1, 0x3 */ (ADC0 << 2) | ADC1,
213 if (db->is_quadrature)
214 subdev0_uses = 0x3; // uses A/D 0 and 1
216 subdev0_uses = 0x1; // uses A/D 0 only
218 // FIXME second subdev on Basic Rx, LF RX
220 // subdev1_uses = 0x2;
225 int swap_iq = db->i_and_q_swapped & 0x1;
226 int index = (swap_iq << 2) | uses;
228 return truth_table[index];
237 tx_dboard = lookup_dboard(I2C_ADDR_TX_A, &db_basic_tx, "Tx");
238 //printf("db_init: tx dbid = 0x%x\n", tx_dboard->dbid);
239 set_gpio_mode(GPIO_TX_BANK, tx_dboard);
240 tx_dboard->init(tx_dboard);
241 m = determine_tx_mux_value(tx_dboard);
242 dsp_tx_regs->tx_mux = m;
243 //printf("tx_mux = 0x%x\n", m);
244 tx_dboard->current_lo_offset = tx_dboard->default_lo_offset;
246 rx_dboard = lookup_dboard(I2C_ADDR_RX_A, &db_basic_rx, "Rx");
247 //printf("db_init: rx dbid = 0x%x\n", rx_dboard->dbid);
248 set_gpio_mode(GPIO_RX_BANK, rx_dboard);
249 rx_dboard->init(rx_dboard);
250 m = determine_rx_mux_value(rx_dboard);
251 dsp_rx_regs->rx_mux = m;
252 //printf("rx_mux = 0x%x\n", m);
253 rx_dboard->current_lo_offset = rx_dboard->default_lo_offset;
257 * Calculate the frequency to use for setting the digital down converter.
259 * \param[in] target_freq desired RF frequency (Hz)
260 * \param[in] baseband_freq the RF frequency that corresponds to DC in the IF.
262 * \param[out] dxc_freq is the value for the ddc
263 * \param[out] inverted is true if we're operating in an inverted Nyquist zone.
266 calc_dxc_freq(u2_fxpt_freq_t target_freq, u2_fxpt_freq_t baseband_freq,
267 u2_fxpt_freq_t *dxc_freq, bool *inverted)
269 u2_fxpt_freq_t fs = U2_DOUBLE_TO_FXPT_FREQ(100e6); // converter sample rate
270 u2_fxpt_freq_t delta = target_freq - baseband_freq;
273 printf("calc_dxc_freq\n");
274 printf(" fs = "); print_fxpt_freq(fs); newline();
275 printf(" target = "); print_fxpt_freq(target_freq); newline();
276 printf(" baseband = "); print_fxpt_freq(baseband_freq); newline();
277 printf(" delta = "); print_fxpt_freq(delta); newline();
283 if (delta <= fs/2){ // non-inverted region
287 else { // inverted region
288 *dxc_freq = delta - fs;
295 if (delta >= -fs/2){ // non-inverted region
299 else { // inverted region
300 *dxc_freq = delta + fs;
307 db_set_lo_offset(struct db_base *db, u2_fxpt_freq_t offset)
309 db->current_lo_offset = offset;
314 db_tune(struct db_base *db, u2_fxpt_freq_t target_freq, struct tune_result *result)
316 memset(result, 0, sizeof(*result));
317 bool inverted = false;
318 u2_fxpt_freq_t dxc_freq;
319 u2_fxpt_freq_t actual_dxc_freq;
321 // Ask the d'board to tune as closely as it can to target_freq+lo_offset
322 bool ok = db->set_freq(db, target_freq+db->current_lo_offset, &result->baseband_freq);
324 // Calculate the DDC setting that will downconvert the baseband from the
325 // daughterboard to our target frequency.
326 calc_dxc_freq(target_freq, result->baseband_freq, &dxc_freq, &inverted);
328 // If the spectrum is inverted, and the daughterboard doesn't do
329 // quadrature downconversion, we can fix the inversion by flipping the
330 // sign of the dxc_freq... (This only happens using the basic_rx board)
332 if (db->spectrum_inverted)
333 inverted = !inverted;
335 if (inverted && !db->is_quadrature){
336 dxc_freq = -dxc_freq;
337 inverted = !inverted;
341 dxc_freq = -dxc_freq; // down conversion versus up conversion
342 ok &= db_set_duc_freq(dxc_freq, &actual_dxc_freq);
345 ok &= db_set_ddc_freq(dxc_freq, &actual_dxc_freq);
348 result->dxc_freq = dxc_freq;
349 result->residual_freq = dxc_freq - actual_dxc_freq;
350 result->inverted = inverted;
355 compute_freq_control_word(u2_fxpt_freq_t target_freq, u2_fxpt_freq_t *actual_freq)
357 // If we were using floating point, we'd calculate
359 // v = (int) rint(target_freq / master_freq) * pow(2.0, 32.0);
361 //printf("compute_freq_control_word\n");
362 //printf(" target_freq = "); print_fxpt_freq(target_freq); newline();
364 int32_t master_freq = 100000000; // 100M
366 int32_t v = ((target_freq << 12)) / master_freq;
367 //printf(" fcw = %d\n", v);
369 *actual_freq = (v * (int64_t) master_freq) >> 12;
371 //printf(" actual = "); print_fxpt_freq(*actual_freq); newline();
378 db_set_ddc_freq(u2_fxpt_freq_t dxc_freq, u2_fxpt_freq_t *actual_dxc_freq)
380 int32_t v = compute_freq_control_word(dxc_freq, actual_dxc_freq);
381 dsp_rx_regs->freq = v;
386 db_set_duc_freq(u2_fxpt_freq_t dxc_freq, u2_fxpt_freq_t *actual_dxc_freq)
388 int32_t v = compute_freq_control_word(dxc_freq, actual_dxc_freq);
389 dsp_tx_regs->freq = v;
394 db_set_gain(struct db_base *db, u2_fxpt_gain_t gain)
396 return db->set_gain(db, gain);
400 db_set_antenna(struct db_base *db, int ant)
402 return db->set_antenna(db, ant);