/* i2c.c */
extern void i2c_clear_start(uint32_t i2c);
extern void i2cp_start(void);
extern void i2cp_abort_start(void);
extern void i2cp_stop(void);
extern void i2cp_abort_stop(void);
extern int i2cp_send_data(uint8_t v);
extern int i2cp_start_transaction(uint8_t a, int wnr);
extern int i2cp_lock(void);
extern void i2cp_unlock(void);
extern void i2cp_start_dma(uint8_t *buf, int len);
extern int i2cp_dma_in_progress(void);
extern void i2cp_stop_dma(void);
extern void i2cp_reset(void);
extern void i2cp_scan(void);
extern void i2cp_init(void);
/* lcd.c */
extern uint32_t refresh_wdt;
extern void dma1_channel6_isr(void);
extern void lcd_refresh_wdt(void);
extern void lcd_write_char(uint8_t c, int x, int y);
extern void lcd_erase(int x, int y, int w);
extern void lcd_erase_line(int w, int y);
extern void lcd_erase_all(void);
extern void lcd_write(char *c, int x, int y);
extern void lcd_backlight(int i);
extern void lcd_enable_refresh(void);
extern int lcd_disable_refresh(void);
extern void lcd_reset(void);
extern void lcd_init(void);
extern void lcd_shutdown(void);
/* led.c */
extern void led_init(void);
extern void led_clear(void);
extern void led_flash(uint32_t v);
extern void led_set(uint32_t v);
extern void led_tick(void);
/* main.c */
extern int main(void);
/* ring.c */
extern void ring_init(ring_t *r, uint8_t *buf, size_t len);
extern int ring_write_byte(ring_t *r, uint8_t c);
extern int ring_read_byte(ring_t *r, uint8_t *c);
extern int ring_write(ring_t *r, uint8_t *buf, size_t len);
extern int ring_empty(ring_t *r);
/* ticker.c */
extern uint32_t ticks;
extern void delay_us(uint32_t d);
extern void sys_tick_handler(void);
extern void delay_ms(uint32_t d);
extern void ticker_init(void);
/* usart.c */
extern ring_t rx1_ring;
extern ring_t tx1_ring;
extern ring_t rx2_ring;
extern ring_t tx2_ring;
extern void usart1_isr(void);
extern void usart2_isr(void);
extern int _write(int file, char *ptr, int len);
extern void usart1_queue(uint8_t d);
extern void usart2_queue(uint8_t d);
extern void usart2_drain(void);
extern void usart1_drain(void);
extern void usart_init(void);