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Si4464/63/61/60
4. Modulation and Hardware Configuration Options
The Si446x supports different modulation options and can be used in various configurations to tailor the device to
any specific application or legacy system for drop in replacement. The modulation and configuration options are set
in API property, MODEM_MOD_TYPE.
4.1. MODEM_MOD_TYPE
?? Summary:
?? Purpose:
Modulation Type
?? This
property selects between OOK, FSK, 4FSK and GFSK modulation, modulation source, and tx direct mode
control.
?? The modulator must be configured for one mode through the entire packet. If portions of the packet alternate
between FSK and 4FSK modes, the modem should be programmed to 4FSK mode.
?? Property:
0x2000
?? Default:
?? Fields:
0x02
?? TX_DIRECT_MODE_TYPE
- default:0
0 = Direct mode operates in synchronous mode, applies to TX only.
1 = Direct mode operates in asynchronous mode, applies to TX only. GFSK is not supported.
?? TX_DIRECT_MODE_GPIO[1:0] - default:0x0
0 = TX direct mode uses gpio0 as data source, applies to TX only.
1 = TX direct mode uses gpio1 as data source, applies to TX only.
2 = TX direct mode uses gpio2 as data source, applies to TX only.
3 = TX direct mode uses gpio3 as data source, applies to TX only.
?? MOD_SOURCE[1:0] - default:0x0
0 = Modulation source is packet handler fifo
1 = Modulation source is direct mode pin
2 = Modulation source is pseudo-random generator
?? MOD_TYPE[2:0] - default:0x2
0 = CW
1 = OOK
2 = 2FSK
3 = 2GFSK
4 = 4FSK
5 = 4GFSK
?? Register
View
MODEM_MOD_TYPE
7
6
5
4
3
2
1
0
TX_DIRECT_MODE_TYPE TX_DIRECT_MODE_GPIO[1:0] MOD_SOURCE[1:0]
MOD_TYPE[2:0]
0
0x0
Rev 1.2
0x0
0x2
25
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