bridge.h File Reference

Register file of the flow bridge and the I2C target protocol. More...

#include <stdint.h>

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Functions
void	bridge_init (void)
void	bridge_set_sensor_ok (uint8_t ok)
void	bridge_add_sample (int16_t dx, int16_t dy, uint8_t squal, uint16_t shutter, uint8_t valid, uint32_t dt_us)
	one motion burst: deltas since the previous burst, dt_us = time between the two bursts; valid = 0 for a sample without surface features
void	bridge_i2c_addr_write (void)
	address matched, master writes
void	bridge_i2c_rx (uint8_t b)
	first byte = register pointer
void	bridge_i2c_addr_read (void)
	address matched, master reads: snapshot
uint8_t	bridge_i2c_tx (void)
	next byte to send
void	bridge_i2c_stop (void)
uint8_t	bridge_take_ctrl (void)
	CTRL bits written by the master, cleared.
uint8_t	bridge_reads (void)
	FRAME reads since boot (LED activity), wraps.

Detailed Description

Register file of the flow bridge and the I2C target protocol.

Pure C (no registers): the main loop adds PMW3901 samples, the I2C interrupt calls the bridge_i2c_* functions. The two sides share the accumulators: bridge_add_sample() must run with the I2C interrupt masked (the main loop wraps it in a short critical section).

Definition in file bridge.h.

Function Documentation

bridge_init()

void bridge_init

(

void

)

Definition at line 19 of file bridge.c.

References s_count, s_ctrl, s_dt_us, s_dx, s_dy, s_first, s_ptr, s_rd, s_reads, s_shutter, s_squal, s_status, and s_wr.

Referenced by main().

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bridge_set_sensor_ok()

void bridge_set_sensor_ok

(

uint8_t

ok

)

Definition at line 26 of file bridge.c.

References FLOW_S_SENSOR_OK, and s_status.

Referenced by main().

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bridge_add_sample()

void bridge_add_sample	(	int16_t	dx,
		int16_t	dy,
		uint8_t	squal,
		uint16_t	shutter,
		uint8_t	valid,
		uint32_t	dt_us
	)

one motion burst: deltas since the previous burst, dt_us = time between the two bursts; valid = 0 for a sample without surface features

Definition at line 32 of file bridge.c.

References FLOW_S_NEW, FLOW_S_REJECTED, s_count, s_dt_us, s_dx, s_dy, s_shutter, s_squal, and s_status.

Referenced by main().

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bridge_i2c_addr_write()

void bridge_i2c_addr_write

(

void

)

address matched, master writes

Definition at line 82 of file bridge.c.

References s_first, and s_wr.

Referenced by I2C1_IRQHandler().

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bridge_i2c_rx()

void bridge_i2c_rx

(

uint8_t

b

)

first byte = register pointer

Definition at line 84 of file bridge.c.

References FLOW_R_CTRL, s_ctrl, s_first, s_ptr, and s_wr.

Referenced by I2C1_IRQHandler().

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bridge_i2c_addr_read()

void bridge_i2c_addr_read

(

void

)

address matched, master reads: snapshot

Definition at line 92 of file bridge.c.

References FLOW_R_FRAME, s_ptr, s_rd, and snapshot().

Referenced by I2C1_IRQHandler().

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bridge_i2c_tx()

uint8_t bridge_i2c_tx

(

void

)

next byte to send

Definition at line 98 of file bridge.c.

References FLOW_REG_SPACE, s_img, and s_rd.

Referenced by I2C1_IRQHandler().

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bridge_i2c_stop()

void bridge_i2c_stop

(

void

)

Definition at line 105 of file bridge.c.

References s_first.

Referenced by I2C1_IRQHandler().

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bridge_take_ctrl()

uint8_t bridge_take_ctrl

(

void

)

CTRL bits written by the master, cleared.

Definition at line 107 of file bridge.c.

References s_ctrl.

Referenced by main().

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bridge_reads()

uint8_t bridge_reads

(

void

)

FRAME reads since boot (LED activity), wraps.

Definition at line 114 of file bridge.c.

References s_reads.

Referenced by main().

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