added test for UART RX on macnica board

cMIPS/tests/mac_uart_rx.c

 //========================================================================
-// UART receive functional test
+// UART reception functional test
 // Linux computer must be connected via USB-serial (/dev/ttyUSB0)
-//    and must run minicom @ 115.200 bps
-// If all is wall, all typed at minicom's terminal are echoed on the LCD
+//    and must run putty @ 9,600 bps
+// If all is well, LCD's line 2 shows text typed into putty's terminal.
+// LCD screen shows on line 1 "cMIPS UART_status UART_error" and on line 2 
+//    the last 15 chars typed on putty.  
+// If all is well, UART_status=0x60="open single quote"
+// in case of error, 
+//     UART_error=0x61='a'=overun or 0x62='b'=framing or 0x63='c'=ovr+fram
+// 7-segment leds show status.TXempty and status.RXfull,
+//    left dot=framing error, right dot=overun error
+// This test runs forever.
 //========================================================================
 
 
 #include "cMIPS.h"
 
-typedef struct control { // control register fields (uses only ls byte)
-  int ign   : 24,        // ignore uppermost bits
-    rts     : 1,         // Request to Send
-    ign2    : 2,         // bits 6,5 ignored
-    intTX   : 1,         // interrupt on TX buffer empty (bit 4)
-    intRX   : 1,         // interrupt on RX buffer full (bit 3)
-    speed   : 3;         // 4,8,16..256 tx-rx clock data rates  (bits 0..2)
-} Tcontrol;
-
-typedef struct status { // status register fields (uses only ls byte)
-  int s;
-  // int ign   : 24,      // ignore uppermost bits
-  //  ign7    : 1,        // ignored (bit 7)
-  //  txEmpty : 1,        // TX register is empty (bit 6)
-  //  rxFull  : 1,        // octet available from RX register (bit 5)
-  //  int_TX_empt: 1,     // interrupt pending on TX empty (bit 4)
-  //  int_RX_full: 1,     // interrupt pending on RX full (bit 3)
-  //  ign2    : 1,        // ignored (bit 2)
-  //  framing : 1,        // framing error (bit 1)
-  //  overun  : 1;        // overun error (bit 0)
-} Tstatus;
-
-#define RXfull  0x00000020
-#define TXempty 0x00000040
-
-
-typedef union ctlStat { // control + status on same address
-  Tcontrol  ctl;        // write-only
-  Tstatus   stat;       // read-only
-} TctlStat;
-
-typedef union data {    // data registers on same address
-  int tx;               // write-only
-  int rx;               // read-only
-} Tdata;
-
-typedef struct serial {
-  TctlStat cs;
-  Tdata    d;
-} Tserial;
+#include "uart_defs.c"
 
 
 #if 0
@@ -56,14 +25,13 @@ char s[32]; // = "the quick brown fox jumps over the lazy dog";
 // char s[32]; // = "               ";
 #endif
 
-int main(void) { // receive a string through the UART serial interface
+void main(void) { // receive a string through the UART serial interface
                  // and write it to the LCD display
   volatile Tserial *uart;  // tell GCC not to optimize away code
   volatile Tstatus status;
   Tcontrol ctrl;
-  int i,n;
-  int state;
-  char c, s[32];
+  int i,n, state;
+  char c;
 
   LCDinit();
 
@@ -74,49 +42,59 @@ int main(void) { // receive a string through the UART serial interface
   LCDput('I');
   LCDput('P');
   LCDput('S');
-  LCDput(' ');
-  LCDput('s');
-  LCDput('a');
-  LCDput('y');
-  LCDput('s');
-  LCDput(' ');
-  LCDput('H');
-  LCDput('I');
-  LCDput('!');
-
-  LCDbotLine();
 
   uart = (void *)IO_UART_ADDR; // bottom of UART address range
 
   ctrl.ign   = 0;
-  ctrl.rts   = 0;
+  ctrl.rts   = 1;
   ctrl.ign2  = 0;
   ctrl.intTX = 0;
   ctrl.intRX = 0;
-  ctrl.speed = 3;
+  ctrl.speed = 7;  // 9.600 bps
   uart->cs.ctl = ctrl;
 
-  LCDput(':');
-  LCDput(' ');
-
-  n = 0;
+  LCDgotoxy(1,2);
+  n = 1;
   do {
 
-    while ( ( (state = uart->cs.stat.s) & RXfull ) == 0 )
-      ;
+    do { 
+      delay_us(1); // just do something so gcc won't optimize this away
+      status = uart->cs.stat;
+    } while ( status.rxFull == 0 );
+
     c = (char)uart->d.rx;
-    DSP7SEGput( state>>4 , 0, state & 0xf, 0);
-    LCDput(c);
 
-    // cmips_delay(12500000);
+    state = ((status.cts <<7) |
+      (status.txEmpty <<6) | (status.rxFull <<5) |
+      // (status.int_TX_empt <<4) | (status.int_RX_full <<3) | 
+	     (status.framing <<1) | status.overun) & 0xff;
+
+    LCDgotoxy(8,1);
+    LCDput((unsigned char)state);
+
+    if (status.framing != 0 || status.overun != 0) {
+      LCDgotoxy(11,1);
+      LCDput((unsigned char)state);
+      DSP7SEGput( (int)status.txEmpty, 
+		  (int)status.framing,
+		  (int)status.rxFull, 
+		  (int)status.overun, 0 );
+    }
+    LCDgotoxy(n,2);
+    LCDputc(c);
+
     n = n + 1;
-    if ( n == 16 ){ 
-      LCDbotLine();
-      n = 0;
+    if ( n == 15 ){
+      delay_ms(1000);
+      LCDgotoxy(1,2);
+      for(i = 1; i < 15; i++)
+	LCDputc(' ');
+      LCDgotoxy(1,2);
+      n = 1;
     }
 
   } while (1 == 1);
 
-  return 0;
+  exit(0);
 
 }

cMIPS/tests/mac_uart_tx.c

 //========================================================================
-// UART transmit functional test
+// UART transmission functional test
 // Linux computer must be connected via USB-serial (/dev/ttyUSB0)
 //    and must run putty @ 9.600 bps
-// If all is well, minicom's screen shows, forever, '0'..'9''\n'...
+// If all is well, putty's screen shows, 
+//   ten times '0'..'9''\n'  then ten times 'a'...'j''\n'.
+// LCD screen shows on line 1 "cMIPS UART_status" and on line 2
+//    {0123456789|abcedfghij}
+// Test ends with RED led shining.
 //========================================================================