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   1 /*
   2  * Copyright © 2009 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17  */
  18
  19 #include "radio.h"
  20
  21 /* Values from SmartRF® Studio for:
  22  *
  23  * Deviation:   20.507812 kHz
  24  * Datarate:    38.360596 kBaud
  25  * Modulation:  GFSK
  26  * RF Freq:     434.549927 MHz
  27  * Channel:     99.975586 kHz
  28  * Channel:     0
  29  * RX filter:   93.75 kHz
  30  */
  31
  32 /*
  33  * For 434.550MHz, the frequency value is:
  34  *
  35  * 434.550e6 / (24e6 / 2**16) = 1186611.2
  36  */
  37
  38 #define FREQ_CONTROL    1186611
  39
  40 /*
  41  * For IF freq of 140.62kHz, the IF value is:
  42  *
  43  * 140.62e3 / (24e6 / 2**10) = 6
  44  */
  45
  46 #define IF_FREQ_CONTROL 6
  47
  48 /*
  49  * For channel bandwidth of 93.75 kHz, the CHANBW_E and CHANBW_M values are
  50  *
  51  * BW = 24e6 / (8 * (4 + M) * 2 ** E)
  52  *
  53  * So, M = 0 and E = 3
  54  */
  55
  56 #define CHANBW_M        0
  57 #define CHANBW_E        3
  58
  59 /*
  60  * For a symbol rate of 38360kBaud, the DRATE_E and DRATE_M values are:
  61  *
  62  * R = (256 + M) * 2** E * 24e6 / 2**28
  63  *
  64  * So M is 163 and E is 10
  65  */
  66
  67 #define DRATE_E         10
  68 #define DRATE_M         163
  69
  70 /*
  71  * For a channel deviation of 20.5kHz, the DEVIATION_E and DEVIATION_M values are:
  72  *
  73  * F = 24e6/2**17 * (8 + DEVIATION_M) * 2**DEVIATION_E
  74  *
  75  * So M is 6 and E is 3
  76  */
  77
  78 #define DEVIATION_M     6
  79 #define DEVIATION_E     3
  80
  81 #define PACKET_LEN      128
  82
  83 /* This are from the table for 433MHz */
  84
  85 #define RF_POWER_M30_DBM        0x12
  86 #define RF_POWER_M20_DBM        0x0e
  87 #define RF_POWER_M15_DBM        0x1d
  88 #define RF_POWER_M10_DBM        0x34
  89 #define RF_POWER_M5_DBM         0x2c
  90 #define RF_POWER_0_DBM          0x60
  91 #define RF_POWER_5_DBM          0x84
  92 #define RF_POWER_7_DBM          0xc8
  93 #define RF_POWER_10_DBM         0xc0
  94
  95 #define RF_POWER                RF_POWER_0_DBM
  96
  97 static __code uint8_t radio_setup[] = {
  98         RF_PA_TABLE7_OFF,       RF_POWER,
  99         RF_PA_TABLE6_OFF,       RF_POWER,
 100         RF_PA_TABLE5_OFF,       RF_POWER,
 101         RF_PA_TABLE4_OFF,       RF_POWER,
 102         RF_PA_TABLE3_OFF,       RF_POWER,
 103         RF_PA_TABLE2_OFF,       RF_POWER,
 104         RF_PA_TABLE1_OFF,       RF_POWER,
 105         RF_PA_TABLE0_OFF,       RF_POWER,
 106
 107         RF_FREQ2_OFF,           FREQ_CONTROL >> 16,
 108         RF_FREQ1_OFF,           FREQ_CONTROL >> 8,
 109         RF_FREQ0_OFF,           FREQ_CONTROL >> 0,
 110
 111         RF_FSCTRL1_OFF,         (IF_FREQ_CONTROL << RF_FSCTRL1_FREQ_IF_SHIFT),
 112         RF_FSCTRL0_OFF,         (0 << RF_FSCTRL0_FREQOFF_SHIFT),
 113
 114         RF_MDMCFG4_OFF,         ((CHANBW_E << RF_MDMCFG4_CHANBW_E_SHIFT) |
 115                                  (CHANBW_M << RF_MDMCFG4_CHANBW_M_SHIFT) |
 116                                  (DRATE_E << RF_MDMCFG4_DRATE_E_SHIFT)),
 117         RF_MDMCFG3_OFF,         (DRATE_M << RF_MDMCFG3_DRATE_M_SHIFT),
 118         RF_MDMCFG2_OFF,         (RF_MDMCFG2_DEM_DCFILT_OFF |
 119                                  RF_MDMCFG2_MOD_FORMAT_GFSK |
 120                                  RF_MDMCFG2_SYNC_MODE_15_16_THRES),
 121         RF_MDMCFG1_OFF,         (RF_MDMCFG1_FEC_EN |
 122                                  RF_MDMCFG1_NUM_PREAMBLE_4 |
 123                                  (2 << RF_MDMCFG1_CHANSPC_E_SHIFT)),
 124         RF_MDMCFG0_OFF,         (17 << RF_MDMCFG0_CHANSPC_M_SHIFT),
 125
 126         RF_CHANNR_OFF,          0,
 127
 128         RF_DEVIATN_OFF,         ((DEVIATION_E << RF_DEVIATN_DEVIATION_E_SHIFT) |
 129                                  (DEVIATION_M << RF_DEVIATN_DEVIATION_M_SHIFT)),
 130
 131         /* SmartRF says set LODIV_BUF_CURRENT_TX to 0
 132          * And, we're not using power ramping, so use PA_POWER 0
 133          */
 134         RF_FREND0_OFF,          ((1 << RF_FREND0_LODIV_BUF_CURRENT_TX_SHIFT) |
 135                                  (0 << RF_FREND0_PA_POWER_SHIFT)),
 136
 137         RF_FREND1_OFF,          ((1 << RF_FREND1_LNA_CURRENT_SHIFT) |
 138                                  (1 << RF_FREND1_LNA2MIX_CURRENT_SHIFT) |
 139                                  (1 << RF_FREND1_LODIV_BUF_CURRENT_RX_SHIFT) |
 140                                  (2 << RF_FREND1_MIX_CURRENT_SHIFT)),
 141
 142         RF_FSCAL3_OFF,          0xE9,
 143         RF_FSCAL2_OFF,          0x0A,
 144         RF_FSCAL1_OFF,          0x00,
 145         RF_FSCAL0_OFF,          0x1F,
 146
 147         RF_TEST2_OFF,           0x88,
 148         RF_TEST1_OFF,           0x31,
 149         RF_TEST0_OFF,           0x09,
 150
 151         /* default sync values */
 152         RF_SYNC1_OFF,           0xD3,
 153         RF_SYNC0_OFF,           0x91,
 154
 155         /* max packet length */
 156         RF_PKTLEN_OFF,          PACKET_LEN,
 157
 158         RF_PKTCTRL1_OFF,        ((1 << PKTCTRL1_PQT_SHIFT)|
 159                                  PKTCTRL1_APPEND_STATUS|
 160                                  PKTCTRL1_ADR_CHK_NONE),
 161         RF_PKTCTRL0_OFF,        (RF_PKTCTRL0_WHITE_DATA|
 162                                  RF_PKTCTRL0_PKT_FORMAT_NORMAL|
 163                                  RF_PKTCTRL0_CRC_EN|
 164                                  RF_PKTCTRL0_LENGTH_CONFIG_FIXED),
 165         RF_ADDR_OFF,            0x00,
 166         RF_MCSM2_OFF,           (RF_MCSM2_RX_TIME_END_OF_PACKET),
 167         RF_MCSM1_OFF,           (RF_MCSM1_CCA_MODE_RSSI_BELOW_UNLESS_RECEIVING|
 168                                  RF_MCSM1_RXOFF_MODE_IDLE|
 169                                  RF_MCSM1_TXOFF_MODE_IDLE),
 170         RF_MCSM0_OFF,           (RF_MCSM0_FS_AUTOCAL_FROM_IDLE|
 171                                  RF_MCSM0_MAGIC_3|
 172                                  RF_MCSM0_CLOSE_IN_RX_18DB),
 173         RF_FOCCFG_OFF,          (RF_FOCCFG_FOC_PRE_K_3K,
 174                                  RF_FOCCFG_FOC_POST_K_PRE_K,
 175                                  RF_FOCCFG_FOC_LIMIT_BW_OVER_4),
 176         RF_BSCFG_OFF,           (RF_BSCFG_BS_PRE_K_2K|
 177                                  RF_BSCFG_BS_PRE_KP_3KP|
 178                                  RF_BSCFG_BS_POST_KI_PRE_KI|
 179                                  RF_BSCFG_BS_POST_KP_PRE_KP|
 180                                  RF_BSCFG_BS_LIMIT_0),
 181         RF_AGCCTRL2_OFF,        0x43,
 182         RF_AGCCTRL1_OFF,        0x40,
 183         RF_AGCCTRL0_OFF,        0x91,
 184
 185         RF_IOCFG2_OFF,          0x00,
 186         RF_IOCFG1_OFF,          0x00,
 187         RF_IOCFG0_OFF,          0x00,
 188 };
 189
 190 void
 191 radio_init(void) {
 192         uint8_t i;
 193         for (i = 0; i < sizeof (radio_setup); i += 2)
 194                 RF[radio_setup[i]] = radio_setup[i+1];
 195 }
 196
 197 #define nop()   _asm nop _endasm;
 198
 199 void
 200 delay (unsigned char n)
 201 {
 202         unsigned char i = 0;
 203
 204         n <<= 1;
 205         while (--n != 0)
 206                 while (--i != 0)
 207                         nop();
 208 }