serialX buffersizes

Additional PR for SERIALX_DISABLE follows

teensy3/serial1.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     64 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL1_TX_BUFFER_SIZE
+#define SERIAL1_TX_BUFFER_SIZE     64 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL1_RX_BUFFER_SIZE
+#define SERIAL1_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL1_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL1_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 #if defined(KINETISK)
   static volatile uint8_t *transmit_pin=NULL;
   #define rts_assert()        *(rts_pin+8) = rts_mask;
   #define rts_deassert()      *(rts_pin+4) = rts_mask;
 #endif
-#if TX_BUFFER_SIZE > 255
+#if SERIAL1_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL1_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC4 & SIM_SCGC4_UART0)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL1_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART0_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART0_D = n;
 	if (transmit_pin) transmit_assert();
 	while (p < end) {
 		head = tx_buffer_head;
-		if (++head >= TX_BUFFER_SIZE) head = 0;
+		if (++head >= SERIAL1_TX_BUFFER_SIZE) head = 0;
 		if (tx_buffer_tail == head) {
 			UART0_C2 = C2_TX_ACTIVE;
 			do {
 				if (priority <= IRQ_PRIORITY) {
 					if ((UART0_S1 & UART_S1_TDRE)) {
 						uint32_t tail = tx_buffer_tail;
-						if (++tail >= TX_BUFFER_SIZE) tail = 0;
+						if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 						n = tx_buffer[tail];
 						if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 						UART0_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL1_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL1_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL1_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL1_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL1_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 					n = UART0_D;
 				}
 				newhead = head + 1;
-				if (newhead >= RX_BUFFER_SIZE) newhead = 0;
+				if (newhead >= SERIAL1_RX_BUFFER_SIZE) newhead = 0;
 				if (newhead != tail) {
 					head = newhead;
 					rx_buffer[head] = n;
 			if (rts_pin) {
 				int avail;
 				if (head >= tail) avail = head - tail;
-				else avail = RX_BUFFER_SIZE + head - tail;
+				else avail = SERIAL1_RX_BUFFER_SIZE + head - tail;
 				if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 			}
 		}
 		tail = tx_buffer_tail;
 		do {
 			if (tail == head) break;
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 			avail = UART0_S1;
 			n = tx_buffer[tail];
 			if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 		n = UART0_D;
 		if (use9Bits && (UART0_C3 & 0x80)) n |= 0x100;
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL1_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 		if (head == tail) {
 			UART0_C2 = C2_TX_COMPLETING;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART0_D = n;

teensy3/serial1_doughboy.txt

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE 64 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE 64 // number of incoming bytes to buffer
+#ifndef SERIAL1_TX_BUFFER_SIZE
+#define SERIAL1_TX_BUFFER_SIZE 64 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL1_RX_BUFFER_SIZE
+#define SERIAL1_RX_BUFFER_SIZE 64 // number of incoming bytes to buffer
+#endif
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 
 
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL1_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL1_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 #if defined(KINETISK)
   static volatile uint8_t *transmit_pin=NULL;
   #define transmit_assert()   *(transmit_pin+4) = transmit_mask;
   #define transmit_deassert() *(transmit_pin+8) = transmit_mask;
 #endif
-#if TX_BUFFER_SIZE > 255
+#if SERIAL1_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL1_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC4 & SIM_SCGC4_UART0)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL1_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART0_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART0_D = n;
 	if (transmit_pin) transmit_assert();
 	while (p < end) {
 		head = tx_buffer_head;
-		if (++head >= TX_BUFFER_SIZE) head = 0;
+		if (++head >= SERIAL1_TX_BUFFER_SIZE) head = 0;
 		if (tx_buffer_tail == head) {
 			UART0_C2 |= UART_C2_TIE;
 			UART0_C2 &= ~UART_C2_TCIE;
 				if (priority <= IRQ_PRIORITY) {
 					if ((UART0_S1 & UART_S1_TDRE)) {
 						uint32_t tail = tx_buffer_tail;
-						if (++tail >= TX_BUFFER_SIZE) tail = 0;
+						if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 						n = tx_buffer[tail];
 						if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 						UART0_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL1_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL1_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL1_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 #ifdef HAS_KINETISK_UART0_FIFO
 	if ((UART0_C2 & (UART_C2_RIE | UART_C2_ILIE))==0) {//rx interrupt currently disabled
 		int freespace;
 		if (head >= tail) //rx head and tail would be unchanged from above if interrupts were disabled
-			freespace = RX_BUFFER_SIZE -1 + tail - head;
+			freespace = SERIAL1_RX_BUFFER_SIZE -1 + tail - head;
 		else
 			freespace = tail - head - 1;
 		if (freespace >= UART0_RCFIFO) {
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL1_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 			tail = rx_buffer_tail;
 			do {
 				newhead = head + 1;
-				if (newhead >= RX_BUFFER_SIZE) newhead = 0;
+				if (newhead >= SERIAL1_RX_BUFFER_SIZE) newhead = 0;
 				if (UART0_MODEM & UART_MODEM_RXRTSE) {
 					if (newhead == tail) {
 						UART0_C2 &= ~(UART_C2_RIE | UART_C2_ILIE);//disable rx interrupts
 		tail = tx_buffer_tail;
 		do {
 			if (tail == head) break;
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 			UART0_S1;
 			n = tx_buffer[tail];
 			if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 	if (UART0_S1 & UART_S1_RDRF) {
 		do {
 			head = rx_buffer_head + 1;
-			if (head >= RX_BUFFER_SIZE) head = 0;
+			if (head >= SERIAL1_RX_BUFFER_SIZE) head = 0;
 			if (UART0_MODEM & UART_MODEM_RXRTSE) {
 				if (head == rx_buffer_tail) {
 					UART0_C2 &= ~(UART_C2_RIE);//disable rx interrupts
 			UART0_C2 |= UART_C2_TCIE;
 			UART0_C2 &= ~UART_C2_TIE;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL1_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART0_C3 = (UART0_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART0_D = n;

teensy3/serial2.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL2_TX_BUFFER_SIZE
+#define SERIAL2_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL2_RX_BUFFER_SIZE
+#define SERIAL2_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL2_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL2_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 #if defined(KINETISK)
   static volatile uint8_t *transmit_pin=NULL;
   #define rts_assert()        *(rts_pin+8) = rts_mask;
   #define rts_deassert()      *(rts_pin+4) = rts_mask;
 #endif
-#if TX_BUFFER_SIZE > 255
+#if SERIAL2_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL2_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC4 & SIM_SCGC4_UART1)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL2_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART1_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL2_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART1_C3 = (UART1_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART1_D = n;
 	if (transmit_pin) transmit_assert();
 	while (p < end) {
 		head = tx_buffer_head;
-		if (++head >= TX_BUFFER_SIZE) head = 0;
+		if (++head >= SERIAL2_TX_BUFFER_SIZE) head = 0;
 		if (tx_buffer_tail == head) {
 			UART1_C2 = C2_TX_ACTIVE;
 			do {
 				if (priority <= IRQ_PRIORITY) {
 					if ((UART1_S1 & UART_S1_TDRE)) {
 						uint32_t tail = tx_buffer_tail;
-						if (++tail >= TX_BUFFER_SIZE) tail = 0;
+						if (++tail >= SERIAL2_TX_BUFFER_SIZE) tail = 0;
 						n = tx_buffer[tail];
 						if (use9Bits) UART1_C3 = (UART1_C3 & ~0x40) | ((n & 0x100) >> 2);
 						UART1_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL2_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL2_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial2_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL2_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL2_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL2_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 					n = UART1_D;
 				}
 				newhead = head + 1;
-				if (newhead >= RX_BUFFER_SIZE) newhead = 0;
+				if (newhead >= SERIAL2_RX_BUFFER_SIZE) newhead = 0;
 				if (newhead != tail) {
 					head = newhead;
 					rx_buffer[head] = n;
 			if (rts_pin) {
 				int avail;
 				if (head >= tail) avail = head - tail;
-				else avail = RX_BUFFER_SIZE + head - tail;
+				else avail = SERIAL2_RX_BUFFER_SIZE + head - tail;
 				if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 			}
 		}
 		tail = tx_buffer_tail;
 		do {
 			if (tail == head) break;
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL2_TX_BUFFER_SIZE) tail = 0;
 			avail = UART1_S1;
 			n = tx_buffer[tail];
 			if (use9Bits) UART1_C3 = (UART1_C3 & ~0x40) | ((n & 0x100) >> 2);
 		n = UART1_D;
 		if (use9Bits && (UART1_C3 & 0x80)) n |= 0x100;
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL2_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 		if (head == tail) {
 			UART1_C2 = C2_TX_COMPLETING;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL2_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART1_C3 = (UART1_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART1_D = n;

teensy3/serial3.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL3_TX_BUFFER_SIZE
+#define SERIAL3_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL3_RX_BUFFER_SIZE
+#define SERIAL3_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL3_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL3_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 #if defined(KINETISK)
   static volatile uint8_t *transmit_pin=NULL;
   #define rts_assert()        *(rts_pin+8) = rts_mask;
   #define rts_deassert()      *(rts_pin+4) = rts_mask;
 #endif
-#if TX_BUFFER_SIZE > 255
+#if SERIAL3_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL3_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC4 & SIM_SCGC4_UART2)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL3_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART2_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL3_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART2_C3 = (UART2_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART2_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL3_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL3_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial3_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL3_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL3_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL3_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 			n = UART2_D;
 		}
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL3_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 			int avail;
 			tail = tx_buffer_tail;
 			if (head >= tail) avail = head - tail;
-			else avail = RX_BUFFER_SIZE + head - tail;
+			else avail = SERIAL3_RX_BUFFER_SIZE + head - tail;
 			if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 		}
 	}
 		if (head == tail) {
 			UART2_C2 = C2_TX_COMPLETING;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL3_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART2_C3 = (UART2_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART2_D = n;

teensy3/serial4.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL4_TX_BUFFER_SIZE
+#define SERIAL4_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL4_RX_BUFFER_SIZE
+#define SERIAL4_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL4_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL4_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 static volatile uint8_t *transmit_pin=NULL;
 #define transmit_assert()   *transmit_pin = 1
 static volatile uint8_t *rts_pin=NULL;
 #define rts_assert()        *rts_pin = 0
 #define rts_deassert()      *rts_pin = 1
-#if TX_BUFFER_SIZE > 255
+#if SERIAL4_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL4_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC4 & SIM_SCGC4_UART3)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL4_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART3_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL4_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART3_C3 = (UART3_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART3_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL4_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL4_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial4_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL4_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL4_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL4_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 			n = UART3_D;
 		}
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL4_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 			int avail;
 			tail = tx_buffer_tail;
 			if (head >= tail) avail = head - tail;
-			else avail = RX_BUFFER_SIZE + head - tail;
+			else avail = SERIAL4_RX_BUFFER_SIZE + head - tail;
 			if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 		}
 	}
 		if (head == tail) {
 			UART3_C2 = C2_TX_COMPLETING;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL4_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART3_C3 = (UART3_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART3_D = n;

teensy3/serial5.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL5_TX_BUFFER_SIZE
+#define SERIAL5_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL5_RX_BUFFER_SIZE
+#define SERIAL5_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL5_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL5_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 static volatile uint8_t *transmit_pin=NULL;
 #define transmit_assert()   *transmit_pin = 1
 static volatile uint8_t *rts_pin=NULL;
 #define rts_assert()        *rts_pin = 0
 #define rts_deassert()      *rts_pin = 1
-#if TX_BUFFER_SIZE > 255
+#if SERIAL5_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL5_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC1 & SIM_SCGC1_UART4)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL5_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART4_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL5_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART4_C3 = (UART4_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART4_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL5_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL5_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial5_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL5_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL5_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL5_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 			n = UART4_D;
 		}
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL5_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 			int avail;
 			tail = tx_buffer_tail;
 			if (head >= tail) avail = head - tail;
-			else avail = RX_BUFFER_SIZE + head - tail;
+			else avail = SERIAL5_RX_BUFFER_SIZE + head - tail;
 			if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 		}
 	}
 		if (head == tail) {
 			UART4_C2 = C2_TX_COMPLETING;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL5_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART4_C3 = (UART4_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART4_D = n;

teensy3/serial6.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL6_TX_BUFFER_SIZE
+#define SERIAL6_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL6_RX_BUFFER_SIZE
+#define SERIAL6_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL6_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL6_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 static volatile uint8_t *transmit_pin=NULL;
 #define transmit_assert()   *transmit_pin = 1
 static volatile uint8_t *rts_pin=NULL;
 #define rts_assert()        *rts_pin = 0
 #define rts_deassert()      *rts_pin = 1
-#if TX_BUFFER_SIZE > 255
+#if SERIAL6_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL6_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC1 & SIM_SCGC1_UART5)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL6_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((UART5_S1 & UART_S1_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL6_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				if (use9Bits) UART5_C3 = (UART5_C3 & ~0x40) | ((n & 0x100) >> 2);
 				UART5_D = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL6_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL6_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial6_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL6_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL6_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL6_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 			n = UART5_D;
 		}
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL6_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 			int avail;
 			tail = tx_buffer_tail;
 			if (head >= tail) avail = head - tail;
-			else avail = RX_BUFFER_SIZE + head - tail;
+			else avail = SERIAL6_RX_BUFFER_SIZE + head - tail;
 			if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 		}
 	}
 		if (head == tail) {
 			UART5_C2 = C2_TX_COMPLETING;
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL6_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			if (use9Bits) UART5_C3 = (UART5_C3 & ~0x40) | ((n & 0x100) >> 2);
 			UART5_D = n;

teensy3/serial6_lpuart.c

 // Tunable parameters (relatively safe to edit these numbers)
 ////////////////////////////////////////////////////////////////
 
-#define TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
-#define RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#ifndef SERIAL6_TX_BUFFER_SIZE
+#define SERIAL6_TX_BUFFER_SIZE     40 // number of outgoing bytes to buffer
+#endif
+#ifndef SERIAL6_RX_BUFFER_SIZE
+#define SERIAL6_RX_BUFFER_SIZE     64 // number of incoming bytes to buffer
+#endif
 #define RTS_HIGH_WATERMARK 40 // RTS requests sender to pause
 #define RTS_LOW_WATERMARK  26 // RTS allows sender to resume
 #define IRQ_PRIORITY  64  // 0 = highest priority, 255 = lowest
 #define use9Bits 0
 #endif
 
-static volatile BUFTYPE tx_buffer[TX_BUFFER_SIZE];
-static volatile BUFTYPE rx_buffer[RX_BUFFER_SIZE];
+static volatile BUFTYPE tx_buffer[SERIAL6_TX_BUFFER_SIZE];
+static volatile BUFTYPE rx_buffer[SERIAL6_RX_BUFFER_SIZE];
 static volatile uint8_t transmitting = 0;
 static volatile uint8_t *transmit_pin=NULL;
 #define transmit_assert()   *transmit_pin = 1
 static volatile uint8_t *rts_pin=NULL;
 #define rts_assert()        *rts_pin = 0
 #define rts_deassert()      *rts_pin = 1
-#if TX_BUFFER_SIZE > 255
+#if SERIAL6_TX_BUFFER_SIZE > 255
 static volatile uint16_t tx_buffer_head = 0;
 static volatile uint16_t tx_buffer_tail = 0;
 #else
 static volatile uint8_t tx_buffer_head = 0;
 static volatile uint8_t tx_buffer_tail = 0;
 #endif
-#if RX_BUFFER_SIZE > 255
+#if SERIAL6_RX_BUFFER_SIZE > 255
 static volatile uint16_t rx_buffer_head = 0;
 static volatile uint16_t rx_buffer_tail = 0;
 #else
 	if (!(SIM_SCGC2 & SIM_SCGC2_LPUART0)) return;
 	if (transmit_pin) transmit_assert();
 	head = tx_buffer_head;
-	if (++head >= TX_BUFFER_SIZE) head = 0;
+	if (++head >= SERIAL6_TX_BUFFER_SIZE) head = 0;
 	while (tx_buffer_tail == head) {
 		int priority = nvic_execution_priority();
 		if (priority <= IRQ_PRIORITY) {
 			if ((LPUART0_STAT & LPUART_STAT_TDRE)) {
 				uint32_t tail = tx_buffer_tail;
-				if (++tail >= TX_BUFFER_SIZE) tail = 0;
+				if (++tail >= SERIAL6_TX_BUFFER_SIZE) tail = 0;
 				n = tx_buffer[tail];
 				//if (use9Bits) UART5_C3 = (UART5_C3 & ~0x40) | ((n & 0x100) >> 2);
 				LPUART0_DATA = n;
 
 	head = tx_buffer_head;
 	tail = tx_buffer_tail;
-	if (head >= tail) return TX_BUFFER_SIZE - 1 - head + tail;
+	if (head >= tail) return SERIAL6_TX_BUFFER_SIZE - 1 - head + tail;
 	return tail - head - 1;
 }
 
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head >= tail) return head - tail;
-	return RX_BUFFER_SIZE + head - tail;
+	return SERIAL6_RX_BUFFER_SIZE + head - tail;
 }
 
 int serial6_getchar(void)
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL6_RX_BUFFER_SIZE) tail = 0;
 	c = rx_buffer[tail];
 	rx_buffer_tail = tail;
 	if (rts_pin) {
 		int avail;
 		if (head >= tail) avail = head - tail;
-		else avail = RX_BUFFER_SIZE + head - tail;
+		else avail = SERIAL6_RX_BUFFER_SIZE + head - tail;
 		if (avail <= RTS_LOW_WATERMARK) rts_assert();
 	}
 	return c;
 	head = rx_buffer_head;
 	tail = rx_buffer_tail;
 	if (head == tail) return -1;
-	if (++tail >= RX_BUFFER_SIZE) tail = 0;
+	if (++tail >= SERIAL6_RX_BUFFER_SIZE) tail = 0;
 	return rx_buffer[tail];
 }
 
 //		}
 		n = LPUART0_DATA & 0x3ff;	// use only the 10 data bits
 		head = rx_buffer_head + 1;
-		if (head >= RX_BUFFER_SIZE) head = 0;
+		if (head >= SERIAL6_RX_BUFFER_SIZE) head = 0;
 		if (head != rx_buffer_tail) {
 			rx_buffer[head] = n;
 			rx_buffer_head = head;
 			int avail;
 			tail = tx_buffer_tail;
 			if (head >= tail) avail = head - tail;
-			else avail = RX_BUFFER_SIZE + head - tail;
+			else avail = SERIAL6_RX_BUFFER_SIZE + head - tail;
 			if (avail >= RTS_HIGH_WATERMARK) rts_deassert();
 		}
 	}
 			//LPUART0_CTRL &= ~LPUART_CTRL_TIE; 
   			//LPUART0_CTRL |= LPUART_CTRL_TCIE; // Actually wondering if we can just leave this one on...
 		} else {
-			if (++tail >= TX_BUFFER_SIZE) tail = 0;
+			if (++tail >= SERIAL6_TX_BUFFER_SIZE) tail = 0;
 			n = tx_buffer[tail];
 			//if (use9Bits) UART5_C3 = (UART5_C3 & ~0x40) | ((n & 0x100) >> 2);
 			LPUART0_DATA = n;