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-rw-r--r--cores/arduino/HardwareSerial.cpp125
-rw-r--r--cores/arduino/HardwareSerial.h26
2 files changed, 63 insertions, 88 deletions
diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index 7b056e9..e40bfbc 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -49,59 +49,17 @@
#endif
#endif
-// Define constants and variables for buffering incoming serial data. We're
-// using a ring buffer (I think), in which head is the index of the location
-// to which to write the next incoming character and tail is the index of the
-// location from which to read.
-#if (RAMEND < 1000)
- #define SERIAL_BUFFER_SIZE 16
-#else
- #define SERIAL_BUFFER_SIZE 64
-#endif
-
-struct ring_buffer
-{
- unsigned char buffer[SERIAL_BUFFER_SIZE];
- volatile uint8_t head;
- volatile uint8_t tail;
-};
-
-#if SERIAL_BUFFER_SIZE > 256
-#error Serial buffer size too big for head and tail pointers
-#endif
-
-#if defined(USBCON)
- ring_buffer rx_buffer = { { 0 }, 0, 0};
- ring_buffer tx_buffer = { { 0 }, 0, 0};
-#endif
-#if defined(UBRRH) || defined(UBRR0H)
- ring_buffer rx_buffer = { { 0 }, 0, 0 };
- ring_buffer tx_buffer = { { 0 }, 0, 0 };
-#endif
-#if defined(UBRR1H)
- ring_buffer rx_buffer1 = { { 0 }, 0, 0 };
- ring_buffer tx_buffer1 = { { 0 }, 0, 0 };
-#endif
-#if defined(UBRR2H)
- ring_buffer rx_buffer2 = { { 0 }, 0, 0 };
- ring_buffer tx_buffer2 = { { 0 }, 0, 0 };
-#endif
-#if defined(UBRR3H)
- ring_buffer rx_buffer3 = { { 0 }, 0, 0 };
- ring_buffer tx_buffer3 = { { 0 }, 0, 0 };
-#endif
-
-inline void store_char(unsigned char c, ring_buffer *buffer)
+inline void store_char(unsigned char c, HardwareSerial *s)
{
- int i = (unsigned int)(buffer->head + 1) % SERIAL_BUFFER_SIZE;
+ int i = (unsigned int)(s->_rx_buffer_head + 1) % SERIAL_BUFFER_SIZE;
// if we should be storing the received character into the location
// just before the tail (meaning that the head would advance to the
// current location of the tail), we're about to overflow the buffer
// and so we don't write the character or advance the head.
- if (i != buffer->tail) {
- buffer->buffer[buffer->head] = c;
- buffer->head = i;
+ if (i != s->_rx_buffer_tail) {
+ s->_rx_buffer[s->_rx_buffer_head] = c;
+ s->_rx_buffer_head = i;
}
}
@@ -126,7 +84,7 @@ inline void store_char(unsigned char c, ring_buffer *buffer)
#if defined(UDR0)
if (bit_is_clear(UCSR0A, UPE0)) {
unsigned char c = UDR0;
- store_char(c, &rx_buffer);
+ store_char(c, &Serial);
} else {
unsigned char c = UDR0;
};
@@ -152,7 +110,7 @@ inline void store_char(unsigned char c, ring_buffer *buffer)
{
if (bit_is_clear(UCSR1A, UPE1)) {
unsigned char c = UDR1;
- store_char(c, &rx_buffer1);
+ store_char(c, &Serial1);
} else {
unsigned char c = UDR1;
};
@@ -167,7 +125,7 @@ inline void store_char(unsigned char c, ring_buffer *buffer)
{
if (bit_is_clear(UCSR2A, UPE2)) {
unsigned char c = UDR2;
- store_char(c, &rx_buffer2);
+ store_char(c, &Serial2);
} else {
unsigned char c = UDR2;
};
@@ -182,7 +140,7 @@ inline void store_char(unsigned char c, ring_buffer *buffer)
{
if (bit_is_clear(UCSR3A, UPE3)) {
unsigned char c = UDR3;
- store_char(c, &rx_buffer3);
+ store_char(c, &Serial3);
} else {
unsigned char c = UDR3;
};
@@ -222,7 +180,7 @@ ISR(USART0_UDRE_vect)
ISR(USART_UDRE_vect)
#endif
{
- if (tx_buffer.head == tx_buffer.tail) {
+ if (Serial._tx_buffer_head == Serial._tx_buffer_tail) {
// Buffer empty, so disable interrupts
#if defined(UCSR0B)
cbi(UCSR0B, UDRIE0);
@@ -232,8 +190,8 @@ ISR(USART_UDRE_vect)
}
else {
// There is more data in the output buffer. Send the next byte
- unsigned char c = tx_buffer.buffer[tx_buffer.tail];
- tx_buffer.tail = (tx_buffer.tail + 1) % SERIAL_BUFFER_SIZE;
+ unsigned char c = Serial._tx_buffer[Serial._tx_buffer_tail];
+ Serial._tx_buffer_tail = (Serial._tx_buffer_tail + 1) % SERIAL_BUFFER_SIZE;
#if defined(UDR0)
UDR0 = c;
@@ -250,14 +208,14 @@ ISR(USART_UDRE_vect)
#ifdef USART1_UDRE_vect
ISR(USART1_UDRE_vect)
{
- if (tx_buffer1.head == tx_buffer1.tail) {
+ if (Serial1._tx_buffer_head == Serial1._tx_buffer_tail) {
// Buffer empty, so disable interrupts
cbi(UCSR1B, UDRIE1);
}
else {
// There is more data in the output buffer. Send the next byte
- unsigned char c = tx_buffer1.buffer[tx_buffer1.tail];
- tx_buffer1.tail = (tx_buffer1.tail + 1) % SERIAL_BUFFER_SIZE;
+ unsigned char c = Serial1._tx_buffer[Serial1._tx_buffer_tail];
+ Serial1._tx_buffer_tail = (Serial1._tx_buffer_tail + 1) % SERIAL_BUFFER_SIZE;
UDR1 = c;
}
@@ -267,14 +225,14 @@ ISR(USART1_UDRE_vect)
#ifdef USART2_UDRE_vect
ISR(USART2_UDRE_vect)
{
- if (tx_buffer2.head == tx_buffer2.tail) {
+ if (Serial2._tx_buffer_head == Serial2._tx_buffer_tail) {
// Buffer empty, so disable interrupts
cbi(UCSR2B, UDRIE2);
}
else {
// There is more data in the output buffer. Send the next byte
- unsigned char c = tx_buffer2.buffer[tx_buffer2.tail];
- tx_buffer2.tail = (tx_buffer2.tail + 1) % SERIAL_BUFFER_SIZE;
+ unsigned char c = Serial2._tx_buffer[Serial2._tx_buffer_tail];
+ Serial2._tx_buffer_tail = (Serial2._tx_buffer_tail + 1) % SERIAL_BUFFER_SIZE;
UDR2 = c;
}
@@ -284,31 +242,30 @@ ISR(USART2_UDRE_vect)
#ifdef USART3_UDRE_vect
ISR(USART3_UDRE_vect)
{
- if (tx_buffer3.head == tx_buffer3.tail) {
+ if (Serial3._tx_buffer_head == Serial3._tx_buffer_tail) {
// Buffer empty, so disable interrupts
cbi(UCSR3B, UDRIE3);
}
else {
// There is more data in the output buffer. Send the next byte
- unsigned char c = tx_buffer3.buffer[tx_buffer3.tail];
- tx_buffer3.tail = (tx_buffer3.tail + 1) % SERIAL_BUFFER_SIZE;
+ unsigned char c = Serial3._tx_buffer[Serial3._tx_buffer_tail];
+ Serial3._tx_buffer_tail = (Serial3._tx_buffer_tail + 1) % SERIAL_BUFFER_SIZE;
UDR3 = c;
}
}
#endif
-
// Constructors ////////////////////////////////////////////////////////////////
-HardwareSerial::HardwareSerial(ring_buffer *rx_buffer, ring_buffer *tx_buffer,
+HardwareSerial::HardwareSerial(
volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
volatile uint8_t *ucsrc, volatile uint8_t *udr,
uint8_t rxen, uint8_t txen, uint8_t rxcie, uint8_t udrie, uint8_t u2x)
{
- _rx_buffer = rx_buffer;
- _tx_buffer = tx_buffer;
+ _tx_buffer_head = _tx_buffer_tail = 0;
+ _rx_buffer_head = _rx_buffer_tail = 0;
_ubrrh = ubrrh;
_ubrrl = ubrrl;
_ucsra = ucsra;
@@ -416,7 +373,7 @@ try_again:
void HardwareSerial::end()
{
// wait for transmission of outgoing data
- while (_tx_buffer->head != _tx_buffer->tail)
+ while (_tx_buffer_head != _tx_buffer_tail)
;
cbi(*_ucsrb, _rxen);
@@ -425,31 +382,31 @@ void HardwareSerial::end()
cbi(*_ucsrb, _udrie);
// clear any received data
- _rx_buffer->head = _rx_buffer->tail;
+ _rx_buffer_head = _rx_buffer_tail;
}
int HardwareSerial::available(void)
{
- return (unsigned int)(SERIAL_BUFFER_SIZE + _rx_buffer->head - _rx_buffer->tail) % SERIAL_BUFFER_SIZE;
+ return (unsigned int)(SERIAL_BUFFER_SIZE + _rx_buffer_head - _rx_buffer_tail) % SERIAL_BUFFER_SIZE;
}
int HardwareSerial::peek(void)
{
- if (_rx_buffer->head == _rx_buffer->tail) {
+ if (_rx_buffer_head == _rx_buffer_tail) {
return -1;
} else {
- return _rx_buffer->buffer[_rx_buffer->tail];
+ return _rx_buffer[_rx_buffer_tail];
}
}
int HardwareSerial::read(void)
{
// if the head isn't ahead of the tail, we don't have any characters
- if (_rx_buffer->head == _rx_buffer->tail) {
+ if (_rx_buffer_head == _rx_buffer_tail) {
return -1;
} else {
- unsigned char c = _rx_buffer->buffer[_rx_buffer->tail];
- _rx_buffer->tail = (unsigned int)(_rx_buffer->tail + 1) % SERIAL_BUFFER_SIZE;
+ unsigned char c = _rx_buffer[_rx_buffer_tail];
+ _rx_buffer_tail = (unsigned int)(_rx_buffer_tail + 1) % SERIAL_BUFFER_SIZE;
return c;
}
}
@@ -463,16 +420,16 @@ void HardwareSerial::flush()
size_t HardwareSerial::write(uint8_t c)
{
- int i = (_tx_buffer->head + 1) % SERIAL_BUFFER_SIZE;
+ int i = (_tx_buffer_head + 1) % SERIAL_BUFFER_SIZE;
// If the output buffer is full, there's nothing for it other than to
// wait for the interrupt handler to empty it a bit
// ???: return 0 here instead?
- while (i == _tx_buffer->tail)
+ while (i == _tx_buffer_tail)
;
- _tx_buffer->buffer[_tx_buffer->head] = c;
- _tx_buffer->head = i;
+ _tx_buffer[_tx_buffer_head] = c;
+ _tx_buffer_head = i;
sbi(*_ucsrb, _udrie);
// clear the TXC bit -- "can be cleared by writing a one to its bit location"
@@ -489,9 +446,9 @@ HardwareSerial::operator bool() {
// Preinstantiate Objects //////////////////////////////////////////////////////
#if defined(UBRRH) && defined(UBRRL)
- HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR, RXEN, TXEN, RXCIE, UDRIE, U2X);
+ HardwareSerial Serial(&UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR, RXEN, TXEN, RXCIE, UDRIE, U2X);
#elif defined(UBRR0H) && defined(UBRR0L)
- HardwareSerial Serial(&rx_buffer, &tx_buffer, &UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0, RXEN0, TXEN0, RXCIE0, UDRIE0, U2X0);
+ HardwareSerial Serial(&UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0, RXEN0, TXEN0, RXCIE0, UDRIE0, U2X0);
#elif defined(USBCON)
// do nothing - Serial object and buffers are initialized in CDC code
#else
@@ -499,13 +456,13 @@ HardwareSerial::operator bool() {
#endif
#if defined(UBRR1H)
- HardwareSerial Serial1(&rx_buffer1, &tx_buffer1, &UBRR1H, &UBRR1L, &UCSR1A, &UCSR1B, &UCSR1C, &UDR1, RXEN1, TXEN1, RXCIE1, UDRIE1, U2X1);
+ HardwareSerial Serial1(&UBRR1H, &UBRR1L, &UCSR1A, &UCSR1B, &UCSR1C, &UDR1, RXEN1, TXEN1, RXCIE1, UDRIE1, U2X1);
#endif
#if defined(UBRR2H)
- HardwareSerial Serial2(&rx_buffer2, &tx_buffer2, &UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UCSR2C, &UDR2, RXEN2, TXEN2, RXCIE2, UDRIE2, U2X2);
+ HardwareSerial Serial2(&UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UCSR2C, &UDR2, RXEN2, TXEN2, RXCIE2, UDRIE2, U2X2);
#endif
#if defined(UBRR3H)
- HardwareSerial Serial3(&rx_buffer3, &tx_buffer3, &UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UCSR3C, &UDR3, RXEN3, TXEN3, RXCIE3, UDRIE3, U2X3);
+ HardwareSerial Serial3(&UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UCSR3C, &UDR3, RXEN3, TXEN3, RXCIE3, UDRIE3, U2X3);
#endif
#endif // whole file
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index a73117f..a091e03 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -27,13 +27,19 @@
#include "Stream.h"
-struct ring_buffer;
+// Define constants and variables for buffering incoming serial data. We're
+// using a ring buffer (I think), in which head is the index of the location
+// to which to write the next incoming character and tail is the index of the
+// location from which to read.
+#if (RAMEND < 1000)
+ #define SERIAL_BUFFER_SIZE 16
+#else
+ #define SERIAL_BUFFER_SIZE 64
+#endif
class HardwareSerial : public Stream
{
private:
- ring_buffer *_rx_buffer;
- ring_buffer *_tx_buffer;
volatile uint8_t *_ubrrh;
volatile uint8_t *_ubrrl;
volatile uint8_t *_ucsra;
@@ -46,8 +52,20 @@ class HardwareSerial : public Stream
uint8_t _udrie;
uint8_t _u2x;
bool transmitting;
+
public:
- HardwareSerial(ring_buffer *rx_buffer, ring_buffer *tx_buffer,
+ volatile uint8_t _rx_buffer_head;
+ volatile uint8_t _rx_buffer_tail;
+ volatile uint8_t _tx_buffer_head;
+ volatile uint8_t _tx_buffer_tail;
+
+ // Don't put any members after these buffers, since only the first
+ // 32 bytes of this struct can be accessed quickly using the ldd
+ // instruction.
+ unsigned char _rx_buffer[SERIAL_BUFFER_SIZE];
+ unsigned char _tx_buffer[SERIAL_BUFFER_SIZE];
+
+ HardwareSerial(
volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
volatile uint8_t *ucsrc, volatile uint8_t *udr,
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-25 19:08:42 +0000