diff options
Diffstat (limited to 'src/drivers/ao_cc115l.c')
| -rw-r--r-- | src/drivers/ao_cc115l.c | 64 |
1 files changed, 48 insertions, 16 deletions
diff --git a/src/drivers/ao_cc115l.c b/src/drivers/ao_cc115l.c index b5103f9b..cf61acfe 100644 --- a/src/drivers/ao_cc115l.c +++ b/src/drivers/ao_cc115l.c @@ -249,23 +249,41 @@ ao_radio_idle(void) } /* - * Packet deviation is 20.5kHz + * Packet deviation * * fdev = fosc >> 17 * (8 + dev_m) << dev_e * + * For 38400 baud, use 20.5kHz: + * * 26e6 / (2 ** 17) * (8 + 5) * (2 ** 3) = 20630Hz + * + * For 9600 baud, use 5.125kHz: + * + * 26e6 / (2 ** 17) * (8 + 5) * (2 ** 1) = 5157Hz + * + * For 2400 baud, use 1.5kHz: + * + * 26e6 / (2 ** 17) * (8 + 0) * (2 ** 0) = 1587Hz */ -#define PACKET_DEV_E 3 -#define PACKET_DEV_M 5 +#define PACKET_DEV_E_384 3 +#define PACKET_DEV_M_384 5 + +#define PACKET_DEV_E_96 1 +#define PACKET_DEV_M_96 5 + +#define PACKET_DEV_E_24 0 +#define PACKET_DEV_M_24 0 /* - * For our packet data, set the symbol rate to 38400 Baud + * For our packet data: * * (256 + DATARATE_M) * 2 ** DATARATE_E * Rdata = -------------------------------------- * fosc * 2 ** 28 * + * For 38400 baud: + * * (256 + 131) * (2 ** 10) / (2**28) * 26e6 = 38383 * * DATARATE_M = 131 @@ -279,20 +297,33 @@ ao_radio_idle(void) #define PACKET_DRATE_E_96 8 #define PACKET_DRATE_E_24 6 -static const uint16_t packet_rate_setup[] = { - [AO_RADIO_RATE_38400] = ((0xf << 4) | - (PACKET_DRATE_E_384 << CC115L_MDMCFG4_DRATE_E)), - - [AO_RADIO_RATE_9600] = ((0xf << 4) | - (PACKET_DRATE_E_96 << CC115L_MDMCFG4_DRATE_E)), - - [AO_RADIO_RATE_2400] = ((0xf << 4) | - (PACKET_DRATE_E_24 << CC115L_MDMCFG4_DRATE_E)), +static const struct { + uint8_t mdmcfg4; + uint8_t deviatn; +} packet_rate_setup[] = { + [AO_RADIO_RATE_38400] = { + .mdmcfg4 = ((0xf << 4) | + (PACKET_DRATE_E_384 << CC115L_MDMCFG4_DRATE_E)), + .deviatn = ((PACKET_DEV_E_384 << CC115L_DEVIATN_DEVIATION_E) | + (PACKET_DEV_M_384 << CC115L_DEVIATN_DEVIATION_M)), + }, + + [AO_RADIO_RATE_9600] = { + .mdmcfg4 = ((0xf << 4) | + (PACKET_DRATE_E_96 << CC115L_MDMCFG4_DRATE_E)), + .deviatn = ((PACKET_DEV_E_96 << CC115L_DEVIATN_DEVIATION_E) | + (PACKET_DEV_M_96 << CC115L_DEVIATN_DEVIATION_M)), + }, + + [AO_RADIO_RATE_2400] = { + .mdmcfg4 = ((0xf << 4) | + (PACKET_DRATE_E_24 << CC115L_MDMCFG4_DRATE_E)), + .deviatn = ((PACKET_DEV_E_24 << CC115L_DEVIATN_DEVIATION_E) | + (PACKET_DEV_M_24 << CC115L_DEVIATN_DEVIATION_M)), + }, }; static const uint16_t packet_setup[] = { - CC115L_DEVIATN, ((PACKET_DEV_E << CC115L_DEVIATN_DEVIATION_E) | - (PACKET_DEV_M << CC115L_DEVIATN_DEVIATION_M)), CC115L_MDMCFG3, (PACKET_DRATE_M), CC115L_MDMCFG2, (0x00 | (CC115L_MDMCFG2_MOD_FORMAT_GFSK << CC115L_MDMCFG2_MOD_FORMAT) | @@ -418,7 +449,8 @@ ao_radio_set_mode(uint16_t new_mode) changes = new_mode & (~ao_radio_mode); if (changes & AO_RADIO_MODE_BITS_PACKET_TX) { - ao_radio_reg_write(CC115L_MDMCFG4, packet_rate_setup[ao_config.radio_rate]); + ao_radio_reg_write(CC115L_MDMCFG4, packet_rate_setup[ao_config.radio_rate].mdmcfg4); + ao_radio_reg_write(CC115L_DEVIATN, packet_rate_setup[ao_config.radio_rate].deviatn); for (i = 0; i < sizeof (packet_setup) / sizeof (packet_setup[0]); i += 2) ao_radio_reg_write(packet_setup[i], packet_setup[i+1]); |