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-rw-r--r--cores/arduino/HardwareSerial.cpp83
-rw-r--r--cores/arduino/HardwareSerial.h8
2 files changed, 57 insertions, 34 deletions
diff --git a/cores/arduino/HardwareSerial.cpp b/cores/arduino/HardwareSerial.cpp
index d9059a9..59e0f1a 100644
--- a/cores/arduino/HardwareSerial.cpp
+++ b/cores/arduino/HardwareSerial.cpp
@@ -34,19 +34,54 @@
#include "HardwareSerial.h"
-/*
- * on ATmega8, the uart and its bits are not numbered, so there is no "TXC0"
- * definition.
- */
+// Ensure that the various bit positions we use are available with a 0
+// postfix, so we can always use the values for UART0 for all UARTs. The
+// alternative, passing the various values for each UART to the
+// HardwareSerial constructor also works, but makes the code bigger and
+// slower.
#if !defined(TXC0)
#if defined(TXC)
+// On ATmega8, the uart and its bits are not numbered, so there is no TXC0 etc.
#define TXC0 TXC
+#define RXEN0 RXEN
+#define TXEN0 TXEN
+#define RXCIE0 RXCIE
+#define UDRIE0 UDRIE
+#define U2X0 U2X
+#define UPE0 UPE
+#define UDRE0 UDRE
#elif defined(TXC1)
// Some devices have uart1 but no uart0
#define TXC0 TXC1
+#define RXEN0 RXEN1
+#define TXEN0 TXEN1
+#define RXCIE0 RXCIE1
+#define UDRIE0 UDRIE1
+#define U2X0 U2X1
+#define UPE0 UPE1
+#define UDRE0 UDRE1
#else
-#error TXC0 not definable in HardwareSerial.h
+#error No UART found in HardwareSerial.cpp
+#endif
+#endif // !defined TXC0
+
+// Check at compiletime that it is really ok to use the bit positions of
+// UART0 for the other UARTs as well, in case these values ever get
+// changed for future hardware.
+#if defined(TXC1) && (TXC1 != TXC0 || RXEN1 != RXEN0 || RXCIE1 != RXCIE0 || \
+ UDRIE1 != UDRIE0 || U2X1 != U2X0 || UPE1 != UPE0 || \
+ UDRE1 != UDRE0)
+#error "Not all bit positions for UART1 are the same as for UART0"
+#endif
+#if defined(TXC2) && (TXC2 != TXC0 || RXEN2 != RXEN0 || RXCIE2 != RXCIE0 || \
+ UDRIE2 != UDRIE0 || U2X2 != U2X0 || UPE2 != UPE0 || \
+ UDRE2 != UDRE0)
+#error "Not all bit positions for UART2 are the same as for UART0"
#endif
+#if defined(TXC3) && (TXC3 != TXC0 || RXEN3 != RXEN0 || RXCIE3 != RXCIE0 || \
+ UDRIE3 != UDRIE0 || U3X3 != U3X0 || UPE3 != UPE0 || \
+ UDRE3 != UDRE0)
+#error "Not all bit positions for UART3 are the same as for UART0"
#endif
inline void store_char(unsigned char c, HardwareSerial *s)
@@ -261,8 +296,7 @@ ISR(USART3_UDRE_vect)
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)
+ volatile uint8_t *ucsrc, volatile uint8_t *udr)
{
_tx_buffer_head = _tx_buffer_tail = 0;
_rx_buffer_head = _rx_buffer_tail = 0;
@@ -272,11 +306,6 @@ HardwareSerial::HardwareSerial(
_ucsrb = ucsrb;
_ucsrc = ucsrc;
_udr = udr;
- _rxen = rxen;
- _txen = txen;
- _rxcie = rxcie;
- _udrie = udrie;
- _u2x = u2x;
}
// Public Methods //////////////////////////////////////////////////////////////
@@ -285,7 +314,7 @@ void HardwareSerial::begin(unsigned long baud, byte config)
{
// Try u2x mode first
uint16_t baud_setting = (F_CPU / 4 / baud - 1) / 2;
- *_ucsra = 1 << _u2x;
+ *_ucsra = 1 << U2X0;
// hardcoded exception for 57600 for compatibility with the bootloader
// shipped with the Duemilanove and previous boards and the firmware
@@ -308,10 +337,10 @@ void HardwareSerial::begin(unsigned long baud, byte config)
#endif
*_ucsrc = config;
- sbi(*_ucsrb, _rxen);
- sbi(*_ucsrb, _txen);
- sbi(*_ucsrb, _rxcie);
- cbi(*_ucsrb, _udrie);
+ sbi(*_ucsrb, RXEN0);
+ sbi(*_ucsrb, TXEN0);
+ sbi(*_ucsrb, RXCIE0);
+ cbi(*_ucsrb, UDRIE0);
}
void HardwareSerial::end()
@@ -320,10 +349,10 @@ void HardwareSerial::end()
while (_tx_buffer_head != _tx_buffer_tail)
;
- cbi(*_ucsrb, _rxen);
- cbi(*_ucsrb, _txen);
- cbi(*_ucsrb, _rxcie);
- cbi(*_ucsrb, _udrie);
+ cbi(*_ucsrb, RXEN0);
+ cbi(*_ucsrb, TXEN0);
+ cbi(*_ucsrb, RXCIE0);
+ cbi(*_ucsrb, UDRIE0);
// clear any received data
_rx_buffer_head = _rx_buffer_tail;
@@ -375,7 +404,7 @@ size_t HardwareSerial::write(uint8_t c)
_tx_buffer[_tx_buffer_head] = c;
_tx_buffer_head = i;
- sbi(*_ucsrb, _udrie);
+ sbi(*_ucsrb, UDRIE0);
// clear the TXC bit -- "can be cleared by writing a one to its bit location"
transmitting = true;
sbi(*_ucsra, TXC0);
@@ -386,9 +415,9 @@ size_t HardwareSerial::write(uint8_t c)
// Preinstantiate Objects //////////////////////////////////////////////////////
#if defined(UBRRH) && defined(UBRRL)
- HardwareSerial Serial(&UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR, RXEN, TXEN, RXCIE, UDRIE, U2X);
+ HardwareSerial Serial(&UBRRH, &UBRRL, &UCSRA, &UCSRB, &UCSRC, &UDR);
#elif defined(UBRR0H) && defined(UBRR0L)
- HardwareSerial Serial(&UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0, RXEN0, TXEN0, RXCIE0, UDRIE0, U2X0);
+ HardwareSerial Serial(&UBRR0H, &UBRR0L, &UCSR0A, &UCSR0B, &UCSR0C, &UDR0);
#elif defined(USBCON)
// do nothing - Serial object and buffers are initialized in CDC code
#else
@@ -396,13 +425,13 @@ size_t HardwareSerial::write(uint8_t c)
#endif
#if defined(UBRR1H)
- HardwareSerial Serial1(&UBRR1H, &UBRR1L, &UCSR1A, &UCSR1B, &UCSR1C, &UDR1, RXEN1, TXEN1, RXCIE1, UDRIE1, U2X1);
+ HardwareSerial Serial1(&UBRR1H, &UBRR1L, &UCSR1A, &UCSR1B, &UCSR1C, &UDR1);
#endif
#if defined(UBRR2H)
- HardwareSerial Serial2(&UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UCSR2C, &UDR2, RXEN2, TXEN2, RXCIE2, UDRIE2, U2X2);
+ HardwareSerial Serial2(&UBRR2H, &UBRR2L, &UCSR2A, &UCSR2B, &UCSR2C, &UDR2);
#endif
#if defined(UBRR3H)
- HardwareSerial Serial3(&UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UCSR3C, &UDR3, RXEN3, TXEN3, RXCIE3, UDRIE3, U2X3);
+ HardwareSerial Serial3(&UBRR3H, &UBRR3L, &UCSR3A, &UCSR3B, &UCSR3C, &UDR3);
#endif
#endif // whole file
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index 6dba734..5513226 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -72,11 +72,6 @@ class HardwareSerial : public Stream
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;
bool transmitting;
public:
@@ -94,8 +89,7 @@ class HardwareSerial : public Stream
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);
+ volatile uint8_t *ucsrc, volatile uint8_t *udr);
void begin(unsigned long baud) { begin(baud, SERIAL_8N1); }
void begin(unsigned long, uint8_t);
void end();
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-11-22 21:14:11 +0000