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-rw-r--r--src/drivers/ao_cc1120.c69
-rw-r--r--src/drivers/ao_cc1120.h6
-rw-r--r--src/drivers/ao_cc115l.c64
3 files changed, 110 insertions, 29 deletions
diff --git a/src/drivers/ao_cc1120.c b/src/drivers/ao_cc1120.c
index 1b907940..3ea8b704 100644
--- a/src/drivers/ao_cc1120.c
+++ b/src/drivers/ao_cc1120.c
@@ -290,15 +290,32 @@ ao_radio_idle(void)
}
/*
- * Packet deviation is 20.5kHz
+ * Packet deviation
*
* fdev = fosc >> 24 * (256 + dev_m) << dev_e
*
+ * Deviation for 38400 baud should be 20.5kHz:
+ *
* 32e6Hz / (2 ** 24) * (256 + 80) * (2 ** 5) = 20508Hz
+ *
+ * Deviation for 9600 baud should be 5.125kHz:
+ *
+ * 32e6Hz / (2 ** 24) * (256 + 80) * (2 ** 3) = 5127Hz
+ *
+ * Deviation for 2400 baud should be 1.28125kHz, but cc1111 and
+ * cc115l can't do that, so we'll use 1.5kHz instead:
+ *
+ * 32e6Hz / (2 ** 24) * (256 + 137) * (2 ** 1) = 1499Hz
*/
-#define PACKET_DEV_E 5
-#define PACKET_DEV_M 80
+#define PACKET_DEV_M_384 80
+#define PACKET_DEV_E_384 5
+
+#define PACKET_DEV_M_96 80
+#define PACKET_DEV_E_96 3
+
+#define PACKET_DEV_M_24 137
+#define PACKET_DEV_E_24 1
/*
* For our packet data
@@ -307,41 +324,55 @@ ao_radio_idle(void)
* Rdata = -------------------------------------- * fosc
* 2 ** 39
*
+ * Given the bit period of the baseband, T, the bandwidth of the
+ * baseband signal is B = 1/(2T). The overall bandwidth of the
+ * modulated signal is then Channel bandwidth = 2Δf + 2B.
+ *
+ * 38400 -- 2 * 20500 + 38400 = 79.4 kHz
+ * 9600 -- 2 * 5.125 + 9600 = 19.9 kHz
+ * 2400 -- 2 * 1.5 + 2400 = 5.4 khz
+ *
* Symbol rate 38400 Baud:
*
* DATARATE_M = 239914
* DATARATE_E = 9
- * CHANBW = 74.42 (round to 100)
+ * CHANBW = 79.4 (round to 100)
*
* Symbol rate 9600 Baud:
*
* DATARATE_M = 239914
* DATARATE_E = 7
- * CHANBW = 58.58 (round to 62.5)
+ * CHANBW = 19.9 (round to 20)
*
* Symbol rate 2400 Baud:
*
* DATARATE_M = 239914
* DATARATE_E = 5
- * CHANBW = 47.61 (round to 50)
+ * CHANBW = 5.0 (round to 8.0)
*/
#define PACKET_DRATE_M 239914
#define PACKET_DRATE_E_384 9
-#define PACKET_CHAN_BW_384 0x02 /* 200 / 2 = 100 */
+
+/* 200 / 2 = 100 */
+#define PACKET_CHAN_BW_384 ((0 << CC1120_CHAN_BW_CHFILT_BYPASS) | \
+ (CC1120_CHAN_BW_ADC_CIC_DECFACT_20 << CC1120_CHAN_BW_ADC_CIC_DECFACT) | \
+ (2 << CC1120_CHAN_BW_BB_CIC_DECFACT))
#define PACKET_DRATE_E_96 7
-#define PACKET_CHAN_BW_96 0x42 /* 125 / 2 = 62.5 */
+/* 200 / 10 = 20 */
+#define PACKET_CHAN_BW_96 ((0 << CC1120_CHAN_BW_CHFILT_BYPASS) | \
+ (CC1120_CHAN_BW_ADC_CIC_DECFACT_20 << CC1120_CHAN_BW_ADC_CIC_DECFACT) | \
+ (10 << CC1120_CHAN_BW_BB_CIC_DECFACT))
#define PACKET_DRATE_E_24 5
-#define PACKET_CHAN_BW_24 0x04 /* 200 / 4 = 50 */
+/* 200 / 25 = 8 */
+#define PACKET_CHAN_BW_24 ((0 << CC1120_CHAN_BW_CHFILT_BYPASS) | \
+ (CC1120_CHAN_BW_ADC_CIC_DECFACT_20 << CC1120_CHAN_BW_ADC_CIC_DECFACT) | \
+ (25 << CC1120_CHAN_BW_BB_CIC_DECFACT))
static const uint16_t packet_setup[] = {
- CC1120_DEVIATION_M, PACKET_DEV_M,
- CC1120_MODCFG_DEV_E, ((CC1120_MODCFG_DEV_E_MODEM_MODE_NORMAL << CC1120_MODCFG_DEV_E_MODEM_MODE) |
- (CC1120_MODCFG_DEV_E_MOD_FORMAT_2_GFSK << CC1120_MODCFG_DEV_E_MOD_FORMAT) |
- (PACKET_DEV_E << CC1120_MODCFG_DEV_E_DEV_E)),
CC1120_DRATE1, ((PACKET_DRATE_M >> 8) & 0xff),
CC1120_DRATE0, ((PACKET_DRATE_M >> 0) & 0xff),
CC1120_PKT_CFG2, ((CC1120_PKT_CFG2_CCA_MODE_ALWAYS_CLEAR << CC1120_PKT_CFG2_CCA_MODE) |
@@ -361,6 +392,10 @@ static const uint16_t packet_setup[] = {
};
static const uint16_t packet_setup_384[] = {
+ CC1120_DEVIATION_M, PACKET_DEV_M_384,
+ CC1120_MODCFG_DEV_E, ((CC1120_MODCFG_DEV_E_MODEM_MODE_NORMAL << CC1120_MODCFG_DEV_E_MODEM_MODE) |
+ (CC1120_MODCFG_DEV_E_MOD_FORMAT_2_GFSK << CC1120_MODCFG_DEV_E_MOD_FORMAT) |
+ (PACKET_DEV_E_384 << CC1120_MODCFG_DEV_E_DEV_E)),
CC1120_DRATE2, ((PACKET_DRATE_E_384 << CC1120_DRATE2_DATARATE_E) |
(((PACKET_DRATE_M >> 16) & CC1120_DRATE2_DATARATE_M_19_16_MASK) << CC1120_DRATE2_DATARATE_M_19_16)),
CC1120_CHAN_BW, PACKET_CHAN_BW_384,
@@ -368,6 +403,10 @@ static const uint16_t packet_setup_384[] = {
};
static const uint16_t packet_setup_96[] = {
+ CC1120_DEVIATION_M, PACKET_DEV_M_96,
+ CC1120_MODCFG_DEV_E, ((CC1120_MODCFG_DEV_E_MODEM_MODE_NORMAL << CC1120_MODCFG_DEV_E_MODEM_MODE) |
+ (CC1120_MODCFG_DEV_E_MOD_FORMAT_2_GFSK << CC1120_MODCFG_DEV_E_MOD_FORMAT) |
+ (PACKET_DEV_E_96 << CC1120_MODCFG_DEV_E_DEV_E)),
CC1120_DRATE2, ((PACKET_DRATE_E_96 << CC1120_DRATE2_DATARATE_E) |
(((PACKET_DRATE_M >> 16) & CC1120_DRATE2_DATARATE_M_19_16_MASK) << CC1120_DRATE2_DATARATE_M_19_16)),
CC1120_CHAN_BW, PACKET_CHAN_BW_96,
@@ -375,6 +414,10 @@ static const uint16_t packet_setup_96[] = {
};
static const uint16_t packet_setup_24[] = {
+ CC1120_DEVIATION_M, PACKET_DEV_M_24,
+ CC1120_MODCFG_DEV_E, ((CC1120_MODCFG_DEV_E_MODEM_MODE_NORMAL << CC1120_MODCFG_DEV_E_MODEM_MODE) |
+ (CC1120_MODCFG_DEV_E_MOD_FORMAT_2_GFSK << CC1120_MODCFG_DEV_E_MOD_FORMAT) |
+ (PACKET_DEV_E_24 << CC1120_MODCFG_DEV_E_DEV_E)),
CC1120_DRATE2, ((PACKET_DRATE_E_24 << CC1120_DRATE2_DATARATE_E) |
(((PACKET_DRATE_M >> 16) & CC1120_DRATE2_DATARATE_M_19_16_MASK) << CC1120_DRATE2_DATARATE_M_19_16)),
CC1120_CHAN_BW, PACKET_CHAN_BW_24,
diff --git a/src/drivers/ao_cc1120.h b/src/drivers/ao_cc1120.h
index 5d24c49a..943f3449 100644
--- a/src/drivers/ao_cc1120.h
+++ b/src/drivers/ao_cc1120.h
@@ -189,6 +189,12 @@
#define CC1120_FREQ_IF_CFG 0x0f
#define CC1120_IQIC 0x10
#define CC1120_CHAN_BW 0x11
+#define CC1120_CHAN_BW_CHFILT_BYPASS 7
+#define CC1120_CHAN_BW_ADC_CIC_DECFACT 6
+#define CC1120_CHAN_BW_ADC_CIC_DECFACT_20 0
+#define CC1120_CHAN_BW_ADC_CIC_DECFACT_32 1
+#define CC1120_CHAN_BW_BB_CIC_DECFACT 0
+
#define CC1120_MDMCFG1 0x12
#define CC1120_MDMCFG1_CARRIER_SENSE_GATE 7
#define CC1120_MDMCFG1_FIFO_EN 6
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]);
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-15 18:25:00 +0000