More files

[uccvend-snackrom.git] / ROM2 / comm.c

diff --git a/ROM2/comm.c b/ROM2/comm.c
index 09ad2a1..c374347 100644 (file)
--- a/ROM2/comm.c
+++ b/ROM2/comm.c
@@ -40,7 +40,7 @@ u8 uart_init() {
        _uart_regs[UART_INT_ENABLE] =
                IE_RECEIVER_READY | IE_TRANSMITTER_READY | IE_LINE_STATUS_CHANGE;
 
-       /* Use the FIFO and empty them */
+       /* Enable the FIFO and empty them */
        _uart_regs[UART_FIFO_CTL] =
                FIFO_ENABLE | FIFO_RX_CLEAR | FIFO_TX_CLEAR | FIFO_LVL_1;
 
@@ -143,6 +143,22 @@ void uart_interrupt() {
  * End of interrupt handler
  */
 
+void send_ack() {
+       wait_for_tx_free();
+       tx_buffer[0] = '!';
+       tx_buffer[1] = '\n';
+       tx_buffer[2] = 0;
+       send_packet();
+}
+
+void send_nack() {
+       wait_for_tx_free();
+       tx_buffer[0] = '?';
+       tx_buffer[1] = '\n';
+       tx_buffer[2] = 0;
+       send_packet();
+}
+
 /* sends the packet in tx_buffer and doesn't return until it's been sent */
 void send_packet() {
        bset((void*)&tx_queue_state, 0x01);