add libs

lib_uart/examples/multi_uart_demo/src/main.xc

@@ -0,0 +1,65 @@
+// Copyright (c) 2015-2016, XMOS Ltd, All rights reserved
+#include <xs1.h>
+#include <platform.h>
+#include <uart.h>
+#include <debug_print.h>
+
+// These ports are configures assuming the multi-UART slice is
+// connected to the STAR slot. For other slots the ports will
+// need to be changed.
+in  buffered port:32 p_uart_rx = XS1_PORT_8A;
+out buffered port:8 p_uart_tx  = XS1_PORT_8B;
+in  port p_uart_clk            = XS1_PORT_1F;
+
+clock clk_uart = XS1_CLKBLK_4;
+
+void loopback(streaming chanend c_rx, client multi_uart_rx_if i_rx,
+              chanend c_tx, client multi_uart_tx_if i_tx)
+{
+  size_t slot;
+
+  // Configure each task with a chanend
+  i_rx.init(c_rx);
+  i_tx.init(c_tx);
+  
+  while (1) {
+    select {
+    case multi_uart_data_ready(c_rx, slot):
+      uint8_t data;
+      if (i_rx.read(slot, data) == UART_RX_VALID_DATA) {
+        if (i_tx.is_slot_free(slot)) {
+          i_tx.write(slot, data);
+        }
+        else {
+          debug_printf("Warning: TX buffer overflow on channel %d\n",
+                       slot);
+        }
+      }
+      break;
+    }
+  }
+}
+
+int main(void)
+{
+  interface multi_uart_rx_if i_rx;
+  streaming chan c_rx;
+  chan c_tx;
+  interface multi_uart_tx_if i_tx;
+
+  // Set the rx and tx lines to be clocked off the clk_uart clock block
+  configure_in_port(p_uart_rx, clk_uart);
+  configure_out_port(p_uart_tx, clk_uart, 0);
+
+  // Configure an external clock for the clk_uart clock block
+  configure_clock_src(clk_uart, p_uart_clk);
+  start_clock(clk_uart);
+
+  // Start the rx/tx tasks and the application task
+  par {
+    multi_uart_rx(c_rx, i_rx, p_uart_rx, 8, 1843200, 115200, UART_PARITY_NONE, 8, 1);
+    multi_uart_tx(c_tx, i_tx, p_uart_tx, 8, 1843200, 115200, UART_PARITY_NONE, 8, 1);
+    loopback(c_rx, i_rx, c_tx, i_tx);
+  }
+  return 0;
+}