static void sam3x_dac_start(struct Dac *dac, void *_buf, size_t len, size_t slice_len)
{
ASSERT(dac);
ASSERT(len >= slice_len);
/* Reset the previous status. */
dac->hw->end = false;
sample_buff = (uint16_t *)_buf;
next_idx = 0;
chunk_size = slice_len;
remaing_size = len;
/* Program the dma with the first and second chunk of samples and update counter */
dac->ctx.callback(dac, &sample_buff[0], chunk_size);
DACC_TPR = (uint32_t)&sample_buff[0];
DACC_TCR = chunk_size;
remaing_size -= chunk_size;
next_idx += chunk_size;
if (chunk_size <= remaing_size)
{
dac->ctx.callback(dac, &sample_buff[next_idx], chunk_size);
DACC_TNPR = (uint32_t)&sample_buff[next_idx];
DACC_TNCR = chunk_size;
remaing_size -= chunk_size;
next_idx += chunk_size;
}
DACC_PTCR |= BV(DACC_PTCR_TXTEN);
DACC_IER = BV(DACC_ENDTX);
/* Set up timer and trig the conversions */
tc_setup(dac->hw->rate, len);
tc_start();
while (1)
{
event_wait(&buff_emtpy);
if (dac->hw->end)
break;
remaing_size -= chunk_size;
next_idx += chunk_size;
if (remaing_size <= 0)
{
remaing_size = len;
next_idx = 0;
}
dac->ctx.callback(dac, &sample_buff[next_idx], chunk_size);
}
}
static void sam3x_dac_conversion(struct Dac *dac, void *buf, size_t len)
{
/* setup timer and start it */
tc_setup(dac->hw->rate, len);
tc_start();
/* Setup dma and start it */
DACC_TPR = (uint32_t)buf;
DACC_TCR = len;
DACC_PTCR |= BV(DACC_PTCR_TXTEN);
}
/* Initialize the map display, at the beginning of the game.. */
init_screen() {
int a, b;
tc_setup();
clear_screen();
for(a = 1; a <= 28; a++) {
for(b = 1; b <= 28; b++) {
if(!off_map(a, b)) {
disp_hex(a, b, '.');
}
}
}
disp_craters();
}
