#define SPI_OFF() do { SPCR = 0; } while(0)
-static inline void spi_wait() {
+static inline __attribute__((always_inline)) void spi_wait() {
loop_until_bit_is_set(SPSR,SPIF);
}
-static inline void spi_write(uint8_t a) {
+static inline __attribute__((always_inline)) void spi_write(uint8_t a) {
SPDR = a;
}