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namespace OSDns {// OSD interface emulates UART
void osd_begin(AP_HAL::OwnPtr<F4Light::SPIDevice> spi);
void osd_loop();
int16_t osd_available();
int16_t osd_getc();
void osd_dequeue();
uint32_t osd_txspace();
void osd_putc(uint8_t c);
void max_do_transfer(const uint8_t *buffer, uint16_t len);
void update_max_buffer(const uint8_t *buffer, uint16_t len);
inline uint32_t millis(){ return AP_HAL::millis(); }
class BetterStream;
}