diff --git a/board/drivers/uart.h b/board/drivers/uart.h
index 0eae2a4a63..b62bc97998 100644
--- a/board/drivers/uart.h
+++ b/board/drivers/uart.h
@@ -69,7 +69,7 @@ uart_ring *get_ring_by_number(int a) {
 }
 
 // ************************* Low-level buffer functions *************************
-bool getc(uart_ring *q, char *elem) {
+bool get_char(uart_ring *q, char *elem) {
   bool ret = false;
 
   ENTER_CRITICAL();
@@ -105,7 +105,7 @@ bool injectc(uart_ring *q, char elem) {
   return ret;
 }
 
-bool putc(uart_ring *q, char elem) {
+bool put_char(uart_ring *q, char elem) {
   bool ret = false;
   uint16_t next_w_ptr;
 
diff --git a/board/jungle/main.c b/board/jungle/main.c
index 3ab39ba1d6..25e2147276 100644
--- a/board/jungle/main.c
+++ b/board/jungle/main.c
@@ -31,7 +31,7 @@
 
 void debug_ring_callback(uart_ring *ring) {
   char rcv;
-  while (getc(ring, &rcv)) {
+  while (get_char(ring, &rcv)) {
     (void)injectc(ring, rcv);
   }
 }
diff --git a/board/jungle/main_comms.h b/board/jungle/main_comms.h
index 49d16e5745..737c90840c 100644
--- a/board/jungle/main_comms.h
+++ b/board/jungle/main_comms.h
@@ -192,7 +192,7 @@ int comms_control_handler(ControlPacket_t *req, uint8_t *resp) {
     // **** 0xe0: debug read
     case 0xe0:
       // read
-      while ((resp_len < MIN(req->length, USBPACKET_MAX_SIZE)) && getc(get_ring_by_number(0), (char*)&resp[resp_len])) {
+      while ((resp_len < MIN(req->length, USBPACKET_MAX_SIZE)) && get_char(get_ring_by_number(0), (char*)&resp[resp_len])) {
         ++resp_len;
       }
       break;
diff --git a/board/libc.h b/board/libc.h
index 1e32d4206e..7f669b95ab 100644
--- a/board/libc.h
+++ b/board/libc.h
@@ -5,6 +5,7 @@ void delay(uint32_t a) {
   for (i = 0; i < a; i++);
 }
 
+// cppcheck-suppress misra-c2012-21.2
 void *memset(void *str, int c, unsigned int n) {
   uint8_t *s = str;
   for (unsigned int i = 0; i < n; i++) {
@@ -17,6 +18,7 @@ void *memset(void *str, int c, unsigned int n) {
 #define UNALIGNED(X, Y) \
   (((uint32_t)(X) & (sizeof(uint32_t) - 1U)) | ((uint32_t)(Y) & (sizeof(uint32_t) - 1U)))
 
+// cppcheck-suppress misra-c2012-21.2
 void *memcpy(void *dest, const void *src, unsigned int len) {
   unsigned int n = len;
   uint8_t *d8 = dest;
@@ -48,6 +50,7 @@ void *memcpy(void *dest, const void *src, unsigned int len) {
   return dest;
 }
 
+// cppcheck-suppress misra-c2012-21.2
 int memcmp(const void * ptr1, const void * ptr2, unsigned int num) {
   int ret = 0;
   const uint8_t *p1 = ptr1;
diff --git a/board/main.c b/board/main.c
index 4fdb98d4a5..b9f12bff8f 100644
--- a/board/main.c
+++ b/board/main.c
@@ -40,8 +40,8 @@ bool check_started(void) {
 
 void debug_ring_callback(uart_ring *ring) {
   char rcv;
-  while (getc(ring, &rcv)) {
-    (void)putc(ring, rcv);  // misra-c2012-17.7: cast to void is ok: debug function
+  while (get_char(ring, &rcv)) {
+    (void)put_char(ring, rcv);  // misra-c2012-17.7: cast to void is ok: debug function
 
     // only allow bootloader entry on debug builds
     #ifdef ALLOW_DEBUG
diff --git a/board/main_comms.h b/board/main_comms.h
index e5ba719faf..6fd2037870 100644
--- a/board/main_comms.h
+++ b/board/main_comms.h
@@ -60,7 +60,7 @@ void comms_endpoint2_write(uint8_t *data, uint32_t len) {
   if ((len != 0U) && (ur != NULL)) {
     if ((data[0] < 2U) || (data[0] >= 4U)) {
       for (uint32_t i = 1; i < len; i++) {
-        while (!putc(ur, data[i])) {
+        while (!put_char(ur, data[i])) {
           // wait
         }
       }
@@ -325,7 +325,7 @@ int comms_control_handler(ControlPacket_t *req, uint8_t *resp) {
 
       // read
       while ((resp_len < MIN(req->length, USBPACKET_MAX_SIZE)) &&
-                         getc(ur, (char*)&resp[resp_len])) {
+                         get_char(ur, (char*)&resp[resp_len])) {
         ++resp_len;
       }
       break;
diff --git a/board/pedal/main.c b/board/pedal/main.c
index 0c8be8a0d8..132044b705 100644
--- a/board/pedal/main.c
+++ b/board/pedal/main.c
@@ -36,8 +36,8 @@ void __initialize_hardware_early(void) {
 
 void debug_ring_callback(uart_ring *ring) {
   char rcv;
-  while (getc(ring, &rcv) != 0) {
-    (void)putc(ring, rcv);
+  while (get_char(ring, &rcv) != 0) {
+    (void)put_char(ring, rcv);
   }
 }
 
@@ -73,7 +73,7 @@ int comms_control_handler(ControlPacket_t *req, uint8_t *resp) {
       }
       // read
       while ((resp_len < MIN(req->length, USBPACKET_MAX_SIZE)) &&
-                         getc(ur, (char*)&resp[resp_len])) {
+                         get_char(ur, (char*)&resp[resp_len])) {
         ++resp_len;
       }
       break;
diff --git a/tests/misra/suppressions.txt b/tests/misra/suppressions.txt
index a77a3d8a6d..4f51e0e2c2 100644
--- a/tests/misra/suppressions.txt
+++ b/tests/misra/suppressions.txt
@@ -32,7 +32,6 @@ misra-c2012-10.3
 misra-c2012-10.5
 misra-c2012-12.2
 misra-c2012-17.3
-misra-c2012-21.2
 misra-c2012-21.15
 misra-c2012-21.16