mirror of https://github.com/kidoman/embd
65 lines
1.0 KiB
Go
65 lines
1.0 KiB
Go
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package embd
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const (
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spi_cpha = 0x01
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spi_cpol = 0x02
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SPI_MODE_0 = (0 | 0)
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SPI_MODE_1 = (0 | spi_cpha)
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SPI_MODE_2 = (spi_cpol | 0)
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SPI_MODE_3 = (spi_cpol | spi_cpha)
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)
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type SPIBus interface {
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TransferAndRecieveData(dataBuffer []uint8) error
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ReceiveData(len int) ([]uint8, error)
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TransferAndReceiveByte(data byte) (byte, error)
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ReceiveByte() (byte, error)
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Close() error
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}
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type SPIDriver interface {
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Bus(byte, byte, int, int, int) SPIBus
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Close() error
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}
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var spiDriverInitialized bool
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var spiDriverInstance SPIDriver
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func InitSPI() error {
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if spiDriverInitialized {
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return nil
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}
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desc, err := DescribeHost()
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if err != nil {
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return err
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}
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if desc.SPIDriver == nil {
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return ErrFeatureNotSupported
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}
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spiDriverInstance = desc.SPIDriver()
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spiDriverInitialized = true
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return nil
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}
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func CloseSPI() error {
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return spiDriverInstance.Close()
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}
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func NewSPIBus(mode, channel byte, speed, bpw, delay int) SPIBus {
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if err := InitSPI(); err != nil {
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panic(err)
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}
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return spiDriverInstance.Bus(mode, channel, speed, bpw, delay)
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}
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