ANT Proximity
Tae-min Hwang
Index
• ANT Layer
• ANT Channel
• Proximity Search
• Test
• Further work
ANT Layer
ANT Layer
Standard ANT/HOST
System on Chip Devices
ANT Channel
ANT Channel
A channel consists of a master and a slave
ANT Channel Communication
Period
ANT Channel
Forward Direction
Reverse Direction
ANT Channel Configuration
• Channel Type
- Optional Extended Assignment
• RF Frequency
ANT Channel
• Channel ID
- Transmission Type
- Device Type
- Device Number
• Channel Period
• Network
ANT Channel Configuration Example
ANT Channel
ANT pairing example
ANT Channel
Channel ID
- The host must specify its channel ID (if master), or it
wishes to search for (if slave)
ANT Channel
• Transmission Type
• Device Type (including pairing bit)
• Device Number
Wild card
ANT Channel
Proximity search
Bin
Proximity Search
Standard search
Proximity search
Proximity thresholds
Proximity Search
Bin 1
Bin 4
Maximum bin : 10
Bin 3
Proximity API
sd_ant_prox_search_set ( uint8_t ucChannel,
uint8_t ucProxThreshold,
uint8_t ucCustomProxThreshold);
uint8_t ucChannel : The channel number
Test
uint8_t ucProxThreshold : the minimum RSSI threshold required for
acquisition during a search ( 0x0 ~ 0x10, 0x80)
uint8_t ucCustomProxThreshold : the custom minimum RSSI
threshold for acquisition during a search
Threshold of bins
Bins dBm
Test
ant_channel_config_t broadcast_channel_config =
{
.channel_number = ANT_BROADCAST_CHANNEL_NUMBER, // 0
.channel_type
= CHANNEL_TYPE_SLAVE_RX_ONLY,
.ext_assign
= EXT_ASSIGN_NONE,
.rf_freq
= ANT_FREQUENCY,
// 2425 MHz
.transmission_type = WILDCARD_TRANSMISSION_TYPE,
.device_type
= WILDCARD_DEVICE_TYPE,
.device_number
= WILDCARD_DEVICE_NUMBER,
.channel_period = ANT_CHANNEL_PERIOD,
// 4 Hz
.network_number = ANT_NETWORK_NUMBER,
// 0x0
};
1
2
3
4
5
6
7
8
9
10
-24
-28
-32
-36
-40
-44
-48
-52
-56
-60
Power consumption
Average peak
2.20mA
Test
Average peak
6.82mA
Limitation of proximity
- Bins are distinguished by RF power
- Affected by antenna orientation
Test
X
Further work
- Test Searching list
- Communication speed for known master device
Further work
- Performance test in Softdevice S332