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nrf: give more flexibility in picking SPI speeds #1446

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Merged
merged 1 commit into from
Oct 18, 2020
Merged

nrf: give more flexibility in picking SPI speeds #1446

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32 changes: 17 additions & 15 deletions src/machine/machine_nrf.go
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Original file line number Diff line number Diff line change
Expand Up @@ -357,23 +357,25 @@ func (spi SPI) Configure(config SPIConfig) {
// set frequency
var freq uint32

switch config.Frequency {
case 125000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_K125
case 250000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_K250
case 500000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_K500
case 1000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M1
case 2000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M2
case 4000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M4
case 8000000:
if config.Frequency == 0 {
config.Frequency = 4000000 // 4MHz
}

switch {
case config.Frequency >= 8000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M8
default:
case config.Frequency >= 4000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M4
case config.Frequency >= 2000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M2
case config.Frequency >= 1000000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_M1
case config.Frequency >= 500000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_K500
case config.Frequency >= 250000:
freq = nrf.SPI_FREQUENCY_FREQUENCY_K250
default: // below 250kHz, default to the lowest speed available
freq = nrf.SPI_FREQUENCY_FREQUENCY_K125
}
spi.Bus.FREQUENCY.Set(freq)

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