Inlined HardwareSerial calls to RX ISR.
Moreover, declaring pointers-to-registers as const and using initializer list in class constructor allows the compiler to further improve inlining performance. This change recovers about 50 bytes of program space on single-UART devices. See #1711
This commit is contained in:
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@ -26,64 +26,14 @@
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#include <string.h>
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#include <inttypes.h>
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#include "Arduino.h"
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#include "wiring_private.h"
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#include "HardwareSerial.h"
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#include "HardwareSerial_private.h"
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// this next line disables the entire HardwareSerial.cpp,
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// this is so I can support Attiny series and any other chip without a uart
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#if defined(HAVE_HWSERIAL0) || defined(HAVE_HWSERIAL1) || defined(HAVE_HWSERIAL2) || defined(HAVE_HWSERIAL3)
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// Ensure that the various bit positions we use are available with a 0
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// postfix, so we can always use the values for UART0 for all UARTs. The
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// alternative, passing the various values for each UART to the
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// HardwareSerial constructor also works, but makes the code bigger and
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// slower.
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#if !defined(TXC0)
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#if defined(TXC)
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// On ATmega8, the uart and its bits are not numbered, so there is no TXC0 etc.
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#define TXC0 TXC
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#define RXEN0 RXEN
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#define TXEN0 TXEN
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#define RXCIE0 RXCIE
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#define UDRIE0 UDRIE
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#define U2X0 U2X
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#define UPE0 UPE
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#define UDRE0 UDRE
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#elif defined(TXC1)
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// Some devices have uart1 but no uart0
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#define TXC0 TXC1
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#define RXEN0 RXEN1
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#define TXEN0 TXEN1
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#define RXCIE0 RXCIE1
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#define UDRIE0 UDRIE1
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#define U2X0 U2X1
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#define UPE0 UPE1
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#define UDRE0 UDRE1
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#else
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#error No UART found in HardwareSerial.cpp
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#endif
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#endif // !defined TXC0
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// Check at compiletime that it is really ok to use the bit positions of
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// UART0 for the other UARTs as well, in case these values ever get
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// changed for future hardware.
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#if defined(TXC1) && (TXC1 != TXC0 || RXEN1 != RXEN0 || RXCIE1 != RXCIE0 || \
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UDRIE1 != UDRIE0 || U2X1 != U2X0 || UPE1 != UPE0 || \
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UDRE1 != UDRE0)
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#error "Not all bit positions for UART1 are the same as for UART0"
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#endif
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#if defined(TXC2) && (TXC2 != TXC0 || RXEN2 != RXEN0 || RXCIE2 != RXCIE0 || \
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UDRIE2 != UDRIE0 || U2X2 != U2X0 || UPE2 != UPE0 || \
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UDRE2 != UDRE0)
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#error "Not all bit positions for UART2 are the same as for UART0"
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#endif
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#if defined(TXC3) && (TXC3 != TXC0 || RXEN3 != RXEN0 || RXCIE3 != RXCIE0 || \
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UDRIE3 != UDRIE0 || U3X3 != U3X0 || UPE3 != UPE0 || \
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UDRE3 != UDRE0)
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#error "Not all bit positions for UART3 are the same as for UART0"
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#endif
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// SerialEvent functions are weak, so when the user doesn't define them,
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// the linker just sets their address to 0 (which is checked below).
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// The Serialx_available is just a wrapper around Serialx.available(),
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@ -127,28 +77,6 @@ void serialEventRun(void)
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// Actual interrupt handlers //////////////////////////////////////////////////////////////
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void HardwareSerial::_rx_complete_irq(void)
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{
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if (bit_is_clear(*_ucsra, UPE0)) {
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// No Parity error, read byte and store it in the buffer if there is
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// room
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unsigned char c = *_udr;
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int i = (unsigned int)(_rx_buffer_head + 1) % SERIAL_BUFFER_SIZE;
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// if we should be storing the received character into the location
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// just before the tail (meaning that the head would advance to the
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// current location of the tail), we're about to overflow the buffer
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// and so we don't write the character or advance the head.
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if (i != _rx_buffer_tail) {
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_rx_buffer[_rx_buffer_head] = c;
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_rx_buffer_head = i;
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}
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} else {
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// Parity error, read byte but discard it
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unsigned char c = *_udr;
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};
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}
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void HardwareSerial::_tx_udr_empty_irq(void)
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{
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// If interrupts are enabled, there must be more data in the output
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@ -169,23 +97,6 @@ void HardwareSerial::_tx_udr_empty_irq(void)
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}
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}
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// Constructors ////////////////////////////////////////////////////////////////
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HardwareSerial::HardwareSerial(
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volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
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volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
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volatile uint8_t *ucsrc, volatile uint8_t *udr)
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{
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_tx_buffer_head = _tx_buffer_tail = 0;
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_rx_buffer_head = _rx_buffer_tail = 0;
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_ubrrh = ubrrh;
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_ubrrl = ubrrl;
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_ucsra = ucsra;
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_ucsrb = ucsrb;
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_ucsrc = ucsrc;
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_udr = udr;
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}
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// Public Methods //////////////////////////////////////////////////////////////
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void HardwareSerial::begin(unsigned long baud, byte config)
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@ -66,12 +66,12 @@
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class HardwareSerial : public Stream
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{
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protected:
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volatile uint8_t *_ubrrh;
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volatile uint8_t *_ubrrl;
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volatile uint8_t *_ucsra;
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volatile uint8_t *_ucsrb;
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volatile uint8_t *_ucsrc;
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volatile uint8_t *_udr;
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volatile uint8_t * const _ubrrh;
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volatile uint8_t * const _ubrrl;
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volatile uint8_t * const _ucsra;
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volatile uint8_t * const _ucsrb;
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volatile uint8_t * const _ucsrc;
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volatile uint8_t * const _udr;
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// Has any byte been written to the UART since begin()
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bool _written;
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@ -87,7 +87,7 @@ class HardwareSerial : public Stream
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unsigned char _tx_buffer[SERIAL_BUFFER_SIZE];
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public:
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HardwareSerial(
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inline HardwareSerial(
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volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
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volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
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volatile uint8_t *ucsrc, volatile uint8_t *udr);
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@ -107,7 +107,7 @@ class HardwareSerial : public Stream
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operator bool() { return true; }
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// Interrupt handlers - Not intended to be called externally
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void _rx_complete_irq(void);
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inline void _rx_complete_irq(void);
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void _tx_udr_empty_irq(void);
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};
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@ -1,5 +1,6 @@
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#include "Arduino.h"
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#include "HardwareSerial.h"
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#include "HardwareSerial_private.h"
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// Each HardwareSerial is defined in its own file, sine the linker pulls
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// in the entire file when any element inside is used. --gc-sections can
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@ -1,5 +1,6 @@
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#include "Arduino.h"
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#include "HardwareSerial.h"
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#include "HardwareSerial_private.h"
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// Each HardwareSerial is defined in its own file, sine the linker pulls
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// in the entire file when any element inside is used. --gc-sections can
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@ -1,5 +1,6 @@
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#include "Arduino.h"
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#include "HardwareSerial.h"
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#include "HardwareSerial_private.h"
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// Each HardwareSerial is defined in its own file, sine the linker pulls
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// in the entire file when any element inside is used. --gc-sections can
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@ -1,5 +1,6 @@
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#include "Arduino.h"
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#include "HardwareSerial.h"
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#include "HardwareSerial_private.h"
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// Each HardwareSerial is defined in its own file, sine the linker pulls
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// in the entire file when any element inside is used. --gc-sections can
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@ -0,0 +1,95 @@
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#include "wiring_private.h"
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// this next line disables the entire HardwareSerial.cpp,
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// this is so I can support Attiny series and any other chip without a uart
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#if defined(HAVE_HWSERIAL0) || defined(HAVE_HWSERIAL1) || defined(HAVE_HWSERIAL2) || defined(HAVE_HWSERIAL3)
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// Ensure that the various bit positions we use are available with a 0
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// postfix, so we can always use the values for UART0 for all UARTs. The
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// alternative, passing the various values for each UART to the
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// HardwareSerial constructor also works, but makes the code bigger and
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// slower.
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#if !defined(TXC0)
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#if defined(TXC)
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// On ATmega8, the uart and its bits are not numbered, so there is no TXC0 etc.
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#define TXC0 TXC
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#define RXEN0 RXEN
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#define TXEN0 TXEN
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#define RXCIE0 RXCIE
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#define UDRIE0 UDRIE
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#define U2X0 U2X
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#define UPE0 UPE
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#define UDRE0 UDRE
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#elif defined(TXC1)
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// Some devices have uart1 but no uart0
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#define TXC0 TXC1
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#define RXEN0 RXEN1
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#define TXEN0 TXEN1
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#define RXCIE0 RXCIE1
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#define UDRIE0 UDRIE1
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#define U2X0 U2X1
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#define UPE0 UPE1
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#define UDRE0 UDRE1
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#else
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#error No UART found in HardwareSerial.cpp
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#endif
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#endif // !defined TXC0
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// Check at compiletime that it is really ok to use the bit positions of
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// UART0 for the other UARTs as well, in case these values ever get
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// changed for future hardware.
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#if defined(TXC1) && (TXC1 != TXC0 || RXEN1 != RXEN0 || RXCIE1 != RXCIE0 || \
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UDRIE1 != UDRIE0 || U2X1 != U2X0 || UPE1 != UPE0 || \
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UDRE1 != UDRE0)
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#error "Not all bit positions for UART1 are the same as for UART0"
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#endif
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#if defined(TXC2) && (TXC2 != TXC0 || RXEN2 != RXEN0 || RXCIE2 != RXCIE0 || \
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UDRIE2 != UDRIE0 || U2X2 != U2X0 || UPE2 != UPE0 || \
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UDRE2 != UDRE0)
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#error "Not all bit positions for UART2 are the same as for UART0"
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#endif
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#if defined(TXC3) && (TXC3 != TXC0 || RXEN3 != RXEN0 || RXCIE3 != RXCIE0 || \
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UDRIE3 != UDRIE0 || U3X3 != U3X0 || UPE3 != UPE0 || \
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UDRE3 != UDRE0)
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#error "Not all bit positions for UART3 are the same as for UART0"
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#endif
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// Constructors ////////////////////////////////////////////////////////////////
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HardwareSerial::HardwareSerial(
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volatile uint8_t *ubrrh, volatile uint8_t *ubrrl,
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volatile uint8_t *ucsra, volatile uint8_t *ucsrb,
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volatile uint8_t *ucsrc, volatile uint8_t *udr) :
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_ubrrh(ubrrh), _ubrrl(ubrrl),
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_ucsra(ucsra), _ucsrb(ucsrb), _ucsrc(ucsrc),
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_udr(udr),
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_tx_buffer_head(0), _tx_buffer_tail(0),
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_rx_buffer_head(0), _rx_buffer_tail(0)
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{
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}
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// Actual interrupt handlers //////////////////////////////////////////////////////////////
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void HardwareSerial::_rx_complete_irq(void)
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{
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if (bit_is_clear(*_ucsra, UPE0)) {
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// No Parity error, read byte and store it in the buffer if there is
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// room
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unsigned char c = *_udr;
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int i = (unsigned int)(_rx_buffer_head + 1) % SERIAL_BUFFER_SIZE;
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// if we should be storing the received character into the location
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// just before the tail (meaning that the head would advance to the
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// current location of the tail), we're about to overflow the buffer
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// and so we don't write the character or advance the head.
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if (i != _rx_buffer_tail) {
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_rx_buffer[_rx_buffer_head] = c;
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_rx_buffer_head = i;
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}
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} else {
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// Parity error, read byte but discard it
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unsigned char c = *_udr;
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};
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}
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#endif // whole file
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