void start_twi_slave(uint8_t slave_address_in, uint8_t use_sleep,
void (*data_callback_in)(uint8_t input_buffer_length, const uint8_t *input_buffer,
uint8_t *output_buffer_length, uint8_t *output_buffer),
void (*idle_callback_in)(void))
{
uint8_t call_datacallback = 0;
slave_address = slave_address_in;
data_callback = data_callback_in;
idle_callback = idle_callback_in;
input_buffer_length = 0;
output_buffer_length = 0;
output_buffer_current = 0;
ss_state = ss_state_idle;
init_twi_slave(slave_address_in);
for (;;) {
if(idle_callback) {
idle_callback();
}
if (ss_state == ss_state_new_data) {
call_datacallback = 1;
}
if(call_datacallback) {
output_buffer_length = 0;
output_buffer_current = 0;
data_callback(input_buffer_length, input_buffer, &output_buffer_length, output_buffer);
input_buffer_length = 0;
call_datacallback = 0;
ss_state = ss_state_idle;
}
}
}
void usi_twi_slave(uint8_t slave_address_in, uint8_t use_sleep,
void (*data_callback_in)(uint8_t buffer_size,
volatile uint8_t input_buffer_length, volatile const uint8_t *input_buffer,
volatile uint8_t *output_buffer_length, volatile uint8_t *output_buffer),
void (*idle_callback_in)(void))
{
slave_address = slave_address_in;
data_callback = data_callback_in;
idle_callback = idle_callback_in;
input_buffer_length = 0;
output_buffer_length = 0;
output_buffer_current = 0;
ss_state = ss_state_before_start;
if(use_sleep)
set_sleep_mode(SLEEP_MODE_IDLE);
twi_init();
sei();
for(;;)
{
if(use_sleep && (ss_state == ss_state_before_start))
sleep_mode();
if(USISR & _BV(USIPF))
{
cli();
#ifdef USE_STATS
if(stats_enabled)stop_conditions_count++;
#endif
USISR |= _BV(USIPF); // clear stop condition flag
switch(ss_state)
{
case(ss_state_after_start):
{
twi_reset();
break;
}
case(ss_state_data_processed):
{
#ifdef USE_STATS
if(stats_enabled)local_frames_count++;
#endif
output_buffer_length = 0;
output_buffer_current = 0;
data_callback(buffer_size, input_buffer_length, input_buffer, &output_buffer_length, output_buffer);
input_buffer_length = 0;
break;
}
}
ss_state = ss_state_before_start;
sei();
}
if(idle_callback)
{
idle_callback();
#ifdef USE_STATS
if(stats_enabled)idle_call_count++;
#endif
}
}
}
