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en:netzer:spi-master [2015/12/23 17:22] svesch [Firmware pro version] Added single slave example |
en:netzer:spi-master [2015/12/23 17:37] svesch [SPI master in single slave operation] |
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| For using this SPI master in a single slave environment this example is provided here. | For using this SPI master in a single slave environment this example is provided here. | ||
| We assume that the slave is connected with the SPI_CS wire like shown below. | We assume that the slave is connected with the SPI_CS wire like shown below. | ||
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| + | {{:en:netzer:spi_master_connection.gif|}} | ||
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| The SPI_CS shall be low active - a low level selects the slave. | The SPI_CS shall be low active - a low level selects the slave. | ||
| + | The pull up resistor at CS is needed to prevent false selection. | ||
| + | This may occur on power up if CS is not driven by Netzer. | ||
| + | The pull up resistor at SPI_MI is needed to prevent floating in case the slave is not selected and therefore the pin is not driven. | ||
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| The data string <code>01 23 45 67 89</code> shall be sent to the SPI slave. | The data string <code>01 23 45 67 89</code> shall be sent to the SPI slave. | ||
