1 files changed, 1 insertions, 0 deletions
diff --git a/src/avr/gpio.h b/src/avr/gpio.h
index 515e4c9a..2f769cb9 100644
--- a/src/avr/gpio.h
+++ b/src/avr/gpio.h
@@ -39,6 +39,7 @@ struct spi_config {
     uint8_t spcr, spsr;
 };
 struct spi_config spi_setup(uint32_t bus, uint8_t mode, uint32_t rate);
+void spi_prepare(struct spi_config config);
 void spi_transfer(struct spi_config config, uint8_t receive_data
                   , uint8_t len, uint8_t *data);