diff --git a/2ano/2semestre/ac2/aula10/addicional.c b/2ano/2semestre/ac2/aula10/addicional.c
new file mode 100644
index 0000000..250f36a
--- /dev/null
+++ b/2ano/2semestre/ac2/aula10/addicional.c
@@ -0,0 +1,21 @@
+#include <detpic32.h>
+
+typedef enum { N, E, O } parity;
+void setupUART2(int baudrate, parity parity, int stopBits) {
+    U2BRG = (PBCLK + 8 * baudrate) / ((baudrate <= 115200 ? 16 : 4) * baudrate) - 1;
+    U2MODEbits.BRGH = baudrate <= 115200 ? 0 : 1;
+
+    U2MODEbits.PDSEL = parity == N ? 00 : parity == E ? 01 : 10;
+    U2MODEbits.STSEL = stopBits == 1 ? 0 : 1;
+
+    U2STAbits.URXEN = 1;
+    U2STAbits.UTXEN = 1;
+
+    U2MODEbits.ON = 1;
+}
+
+int main() {
+    setupUART2(115200, N, 1);
+
+    return 0;
+}
diff --git a/2ano/2semestre/ac2/aula10/part2.c b/2ano/2semestre/ac2/aula10/part2.c
new file mode 100644
index 0000000..dfb5e27
--- /dev/null
+++ b/2ano/2semestre/ac2/aula10/part2.c
@@ -0,0 +1,30 @@
+#include <detpic32.h>
+
+void putc(char byte) {
+    // wait while UTXBF == 1
+    while (U1STAbits.UTXBF == 1);
+    // Copy byte to the UxTXREG register
+    U1TXREG = byte;
+}
+
+int main() {
+    U1BRG = ((PBCLK + 8 * 115200) / (16 * 115200)) - 1;
+    U1MODEbits.BRGH = 0;
+
+    U1MODEbits.PDSEL = 01;
+    U1MODEbits.PDSEL = 0;
+
+    U1STAbits.UTXEN = 1;
+    U1STAbits.URXEN = 0;
+
+    U1MODEbits.ON = 1;
+
+    while (1) {
+        putc(0x5A);
+        resetCoreTimer();
+        while (readCoreTimer() < 200000);
+    }
+
+    return 0;
+}
+
diff --git a/2ano/2semestre/ac2/aula10/part3.c b/2ano/2semestre/ac2/aula10/part3.c
new file mode 100644
index 0000000..5cbe866
--- /dev/null
+++ b/2ano/2semestre/ac2/aula10/part3.c
@@ -0,0 +1,34 @@
+#include <detpic32.h>
+
+void putc(char c) {
+    while (U2STAbits.UTXBF);
+    U2TXREG = c;
+}
+
+void putStr(char *c) {
+    while (*c != '\0') putc(*c++);
+}
+
+int main() {
+    TRISDbits.TRISD11 = 0;
+
+    U2BRG = (PBCLK + 8 * 115200) / (16 * 115200) - 1;
+    U2MODEbits.BRGH = 0;
+
+    U2MODEbits.PDSEL = 00;
+    U2MODEbits.STSEL = 0;
+
+    U2STAbits.URXEN = 1;
+    U2STAbits.UTXEN = 1;
+
+    U2MODEbits.ON = 1;
+
+    while (1) {
+        while (!U2STAbits.TRMT);
+        LATDbits.LATD11 = 1;
+        putStr("12345");
+        LATDbits.LATD11 = 0;
+    }
+
+    return 0;
+}
diff --git a/2ano/2semestre/ac2/aula11/part1.c b/2ano/2semestre/ac2/aula11/part1.c
index 9dbb187..1354197 100644
--- a/2ano/2semestre/ac2/aula11/part1.c
+++ b/2ano/2semestre/ac2/aula11/part1.c
@@ -36,8 +36,8 @@ void _int_(32) isr_uart2rx() {
     // If OERR == 1 then reset OERR
     if (U2STAbits.OERR == 1)
         U2STAbits.OERR = 0;
-    // Wait while URXDA == 0
-    while (U2STAbits.URXDA == 0);
+    if (!IFS1bits.U2RXIF)
+        return;
     // Save U2RXREG value
     char c = U2RXREG;
 
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