avr/avr_demo
avr/avr_demo
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This commit is contained in:
Mika Tuupola 2011-10-05 23:43:17 +03:00
parent 7aa4de63c6
commit 55056f94f0
1 changed files with 34 additions and 34 deletions
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56
hello_uart_async/uart_async.c
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@ -16,15 +16,15 @@
#endif
struct tx_ring {
int buffer[UART_TX_BUFFER_SIZE];
int start;
int end;
int buffer[UART_TX_BUFFER_SIZE];
int start;
int end;
};
struct rx_ring {
int buffer[UART_RX_BUFFER_SIZE];
int start;
int end;
int buffer[UART_RX_BUFFER_SIZE];
int start;
int end;
};
static struct tx_ring tx_buffer;
@ -47,15 +47,15 @@ int uart_putchar(char c, FILE *stream) {
uart_putchar('\r', stream);
}
int write_pointer = (tx_buffer.end + 1) % UART_TX_BUFFER_SIZE;
int write_pointer = (tx_buffer.end + 1) % UART_TX_BUFFER_SIZE;
if (write_pointer != tx_buffer.start){
tx_buffer.buffer[tx_buffer.end] = c;
tx_buffer.end = write_pointer;
if (write_pointer != tx_buffer.start){
tx_buffer.buffer[tx_buffer.end] = c;
tx_buffer.end = write_pointer;
/* Data available. Enable the transmit interrupt for serial port 0. */
UCSR0B |= _BV(UDRIE0);
}
/* Data available. Enable the transmit interrupt for serial port 0. */
UCSR0B |= _BV(UDRIE0);
}
return 0;
}
@ -63,31 +63,31 @@ int uart_putchar(char c, FILE *stream) {
int uart_getchar(FILE *stream) {
int read_pointer = (rx_buffer.start + 1) % UART_RX_BUFFER_SIZE;
rx_buffer.start = read_pointer;
return rx_buffer.buffer[read_pointer];
rx_buffer.start = read_pointer;
return rx_buffer.buffer[read_pointer];
}
ISR(USART_RX_vect) {
int write_pointer = (rx_buffer.end + 1) % UART_RX_BUFFER_SIZE;
int write_pointer = (rx_buffer.end + 1) % UART_RX_BUFFER_SIZE;
/* Add next byte to ringbuffer if it has space available. */
if (write_pointer != rx_buffer.start){
rx_buffer.buffer[rx_buffer.end] = UDR0;
rx_buffer.end = write_pointer;
}
if (write_pointer != rx_buffer.start){
rx_buffer.buffer[rx_buffer.end] = UDR0;
rx_buffer.end = write_pointer;
}
}
ISR(USART_UDRE_vect){
int read_pointer = (tx_buffer.start + 1) % UART_TX_BUFFER_SIZE;
int read_pointer = (tx_buffer.start + 1) % UART_TX_BUFFER_SIZE;
/* Transit next byte if data available in ringbuffer. */
if (read_pointer != tx_buffer.end) {
UDR0 = tx_buffer.buffer[read_pointer];
tx_buffer.start = read_pointer;
} else {
/* Nothing to send. Disable the transmit interrupt for serial port 0. */
UCSR0B &= ~_BV(UDRIE0);
}
if (read_pointer != tx_buffer.end) {
UDR0 = tx_buffer.buffer[read_pointer];
tx_buffer.start = read_pointer;
} else {
/* Nothing to send. Disable the transmit interrupt for serial port 0. */
UCSR0B &= ~_BV(UDRIE0);
}
}