END_TEST
START_TEST(test_ring_write_read_max)
{
s32 ret;
u8 i, ch;
for(i=0; i<9; i++){
ret = (u8)ring_write_ch(&test_ring, i);
fail_unless(i == ret);
}
fail_unless(-1 == ring_write_ch(&test_ring, 10));
for(i=0; i<9; i++){
ret = (u8)ring_read_ch(&test_ring, &ch);
fail_unless(i == ret);
fail_unless(i == ch);
}
ch = 10;
fail_unless(-1 == ring_read_ch(&test_ring, &ch));
fail_unless(10 == ch);
}
void usart2_isr(void)
{
/* Check if we were called because of RXNE. */
if (((USART_CR1(USART2) & USART_CR1_RXNEIE) != 0) &&
((USART_SR(USART2) & USART_SR_RXNE) != 0)) {
/* Indicate that we got data. */
gpio_toggle(GPIOA, GPIO8);
/* Retrieve the data from the peripheral. */
ring_write_ch(&output_ring, usart_recv(USART2));
/* Enable transmit interrupt so it sends back the data. */
USART_CR1(USART2) |= USART_CR1_TXEIE;
}
/* Check if we were called because of TXE. */
if (((USART_CR1(USART2) & USART_CR1_TXEIE) != 0) &&
((USART_SR(USART2) & USART_SR_TXE) != 0)) {
int32_t data;
data = ring_read_ch(&output_ring, NULL);
if (data == -1) {
/* Disable the TXE interrupt, it's no longer needed. */
USART_CR1(USART2) &= ~USART_CR1_TXEIE;
} else {
/* Put data into the transmit register. */
usart_send(USART2, data);
}
}
}
s32 ring_read(struct ring *ring, u8 *data, ring_size_t size)
{
s32 i;
for (i = 0; i < size; i++) {
if (ring_read_ch(ring, data + i) < 0)
return i;
}
return -i;
}
END_TEST
START_TEST(test_ring_write_read_one)
{
s32 ret;
u8 ch;
ret = ring_write_ch(&test_ring, (u8)'A');
fail_unless('A' == ret);
ret = ring_read_ch(&test_ring, &ch);
fail_unless('A' == ret);
fail_unless('A' == ch);
}
s32 gpm_pickup_byte(void)
{
return ring_read_ch(&gpm_output_ring, 0);
}
