mirror of
https://github.com/tinygo-org/drivers.git
synced 2026-08-16 04:43:25 +00:00
Emilio Garcia
110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
package region
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import "tinygo.org/x/drivers/lora"
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const (
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US915_DEFAULT_PREAMBLE_LEN = 8
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US915_DEFAULT_TX_POWER_DBM = 20
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US915_FREQUENCY_INCREMENT_DR_0 = 200000 // only for 125 kHz Bandwidth
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US915_FREQUENCY_INCREMENT_DR_4 = 1600000 // only for 500 kHz Bandwidth
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)
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type ChannelUS struct {
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frequency uint32
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bandwidth uint8
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spreadingFactor uint8
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codingRate uint8
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preambleLength uint16
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txPowerDBm int8
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}
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// Getter functions
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func (c *ChannelUS) Frequency() uint32 { return c.frequency }
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func (c *ChannelUS) Bandwidth() uint8 { return c.bandwidth }
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func (c *ChannelUS) SpreadingFactor() uint8 { return c.spreadingFactor }
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func (c *ChannelUS) CodingRate() uint8 { return c.codingRate }
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func (c *ChannelUS) PreambleLength() uint16 { return c.preambleLength }
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func (c *ChannelUS) TxPowerDBm() int8 { return c.txPowerDBm }
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func (c *ChannelUS) Next() bool {
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switch c.Bandwidth() {
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case lora.Bandwidth_125_0:
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freq, ok := stepFrequency125(c.frequency)
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if ok {
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c.frequency = freq
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} else {
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c.frequency = lora.Mhz_903_0
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c.bandwidth = lora.Bandwidth_500_0
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}
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case lora.Bandwidth_500_0:
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freq, ok := stepFrequency500(c.frequency)
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if ok {
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c.frequency = freq
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} else {
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// there are no more frequencies to check after sweeping all 8 500 kHz channels
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return false
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}
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}
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return true
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}
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func stepFrequency125(freq uint32) (uint32, bool) {
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f := freq + US915_FREQUENCY_INCREMENT_DR_0
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if f >= lora.MHZ_915_0 {
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return 0, false
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}
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return f, true
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}
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func stepFrequency500(freq uint32) (uint32, bool) {
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f := freq + US915_FREQUENCY_INCREMENT_DR_4
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if f >= lora.MHZ_915_0 {
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return 0, false
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}
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return f, true
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}
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type RegionSettingsUS915 struct {
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joinRequestChannel *ChannelUS
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joinAcceptChannel *ChannelUS
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uplinkChannel *ChannelUS
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}
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func US915() *RegionSettingsUS915 {
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return &RegionSettingsUS915{
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joinRequestChannel: &ChannelUS{lora.MHz_902_3,
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lora.Bandwidth_125_0,
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lora.SpreadingFactor10,
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lora.CodingRate4_5,
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US915_DEFAULT_PREAMBLE_LEN,
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US915_DEFAULT_TX_POWER_DBM},
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joinAcceptChannel: &ChannelUS{0,
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lora.Bandwidth_500_0,
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lora.SpreadingFactor9,
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lora.CodingRate4_5,
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US915_DEFAULT_PREAMBLE_LEN,
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US915_DEFAULT_TX_POWER_DBM},
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uplinkChannel: &ChannelUS{lora.Mhz_903_0,
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lora.Bandwidth_500_0,
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lora.SpreadingFactor9,
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lora.CodingRate4_5,
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US915_DEFAULT_PREAMBLE_LEN,
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US915_DEFAULT_TX_POWER_DBM},
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}
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}
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func (r *RegionSettingsUS915) JoinRequestChannel() Channel {
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return r.joinRequestChannel
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}
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func (r *RegionSettingsUS915) JoinAcceptChannel() Channel {
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return r.joinAcceptChannel
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}
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func (r *RegionSettingsUS915) UplinkChannel() Channel {
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return r.uplinkChannel
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}
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