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Diff: OneWire.cpp
- Revision:
- 9:4af0015b0f47
- Parent:
- 8:87fbdaba5535
- Child:
- 10:c89b9ad6097c
--- a/OneWire.cpp Mon Jan 21 11:37:43 2019 +0000
+++ b/OneWire.cpp Sat Jan 26 21:21:27 2019 +0000
@@ -2,12 +2,12 @@
Copyright (c) 2007, Jim Studt (original old version - many contributors since)
The latest version of this library may be found at:
- http://www.pjrc.com/teensy/td_libs_OneWire.html
+ http://www.pjrc.com/teensy/td_libs_Onehtml
OneWire has been maintained by Paul Stoffregen (paul@pjrc.com) since
January 2010. At the time, it was in need of many bug fixes, but had
been abandoned the original author (Jim Studt). None of the known
-contributors were interested in maintaining OneWire. Paul typically
+contributors were interested in maintaining One Paul typically
works on OneWire every 6 to 12 months. Patches usually wait that
long. If anyone is interested in more actively maintaining OneWire,
please contact Paul.
@@ -35,7 +35,7 @@
Delete very old, out-of-date readme file (info is here)
Version 2.0: Modifications by Paul Stoffregen, January 2010:
-http://www.pjrc.com/teensy/td_libs_OneWire.html
+http://www.pjrc.com/teensy/td_libs_Onehtml
Search fix from Robin James
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1238032295/27#27
Use direct optimized I/O in all cases
@@ -115,6 +115,20 @@
*/
#include "OneWire.h"
+#if defined(TARGET_STM)
+ #define MODE() mode(OpenDrain)
+ #define INPUT() (*gpio.reg_set = gpio.mask) // write 1 to open drain
+ #define OUTPUT() // configured as output in the constructor and stays output forever
+ #define READ() ((*gpio.reg_in & gpio.mask) ? 1 : 0)
+ #define WRITE(x) write(x)
+#else
+ #define MODE() mode(PullUp)
+ #define INPUT() input()
+ #define OUTPUT() output()
+ #define READ() read()
+ #define WRITE(x) write(x)
+#endif
+
/**
* @brief
* @note
@@ -122,15 +136,12 @@
* @retval
*/
OneWire::OneWire(PinName pin) :
- wire(pin)
+ DigitalInOut(pin)
{
timer.stop();
timer.reset();
-#if defined(TARGET_STM)
- wire.mode(OpenDrain);
-#else
- wire.mode(PullUp);
-#endif
+ output(); // configure as output
+ MODE(); // set mode PullUp/OpenDrain
#if ONEWIRE_SEARCH
reset_search();
#endif
@@ -148,32 +159,21 @@
uint8_t r;
uint8_t retries = 125;
-#if defined(TARGET_STM)
- wire = 1;
-#else
- wire.input();
-#endif
+ INPUT();
// wait until the wire is high... just in case
-
do {
- if (--retries == 0) {
+ if (--retries == 0)
return 0;
- }
-
wait_us(2);
- } while (wire.read() != 1);
+ } while (READ() != 1);
- wire.output();
- wire = 0;
+ OUTPUT();
+ WRITE(0);
wait_us(480);
-#if defined(TARGET_STM)
- wire = 1;
-#else
- wire.input();
-#endif
- wait_us(70);
- r = !wire.read();
- wait_us(410);
+ INPUT();
+ wait_us(65);
+ r = !READ();
+ wait_us(420);
return r;
}
@@ -184,20 +184,18 @@
//
void OneWire::write_bit(uint8_t v)
{
-#if !defined(TARGET_STM)
- wire.output();
-#endif
+ OUTPUT();
if (v & 1) {
- wire = 0; // drive output low
- wait_us(10);
- wire = 1; // drive output high
- wait_us(55);
+ WRITE(0); // drive output low
+ wait_us(1);
+ WRITE(1); // drive output high
+ wait_us(60);
}
else {
- wire = 0; // drive output low
- wait_us(65);
- wire = 1; // drive output high
- wait_us(5);
+ WRITE(0); // drive output low
+ wait_us(60);
+ WRITE(1); // drive output high
+ wait_us(1);
}
}
@@ -211,23 +209,18 @@
uint8_t r;
int t;
-#if !defined(TARGET_STM)
- wire.output();
-#endif
- wire = 0;
+ OUTPUT();
+ WRITE(0);
timer.start();
-#if defined(TARGET_STM)
- wire = 1;
-#else
- wire.input();
-#endif
+ INPUT();
t = timer.read_us();
if (t < 7)
wait_us(7 - t);
- r = wire.read();
+ timer.reset();
+ r = READ();
timer.stop();
timer.reset();
- wait_us(54);
+ wait_us(55);
return r;
}
@@ -239,22 +232,14 @@
// other mishap.
//
-void OneWire::write(uint8_t v, uint8_t power /* = 0 */ )
+void OneWire::write_byte(uint8_t v, uint8_t power /* = 0 */ )
{
uint8_t bitMask;
- for (bitMask = 0x01; bitMask; bitMask <<= 1) {
- OneWire::write_bit((bitMask & v) ? 1 : 0);
- }
-
+ for (bitMask = 0x01; bitMask; bitMask <<= 1)
+ write_bit((bitMask & v) ? 1 : 0);
if (!power)
- {
-#if defined(TARGET_STM)
- wire = 1;
-#else
- wire.input();
-#endif
- }
+ INPUT();
}
/**
@@ -266,28 +251,22 @@
void OneWire::write_bytes(const uint8_t* buf, uint16_t count, bool power /* = 0 */ )
{
for (uint16_t i = 0; i < count; i++)
- write(buf[i]);
+ write_byte(buf[i]);
if (!power)
- {
-#if defined(TARGET_STM)
- wire = 1;
-#else
- wire.input();
-#endif
- }
+ INPUT();
}
//
// Read a byte
//
-uint8_t OneWire::read()
+uint8_t OneWire::read_byte()
{
uint8_t bitMask;
uint8_t r = 0;
for (bitMask = 0x01; bitMask; bitMask <<= 1) {
- if (OneWire::read_bit())
+ if (read_bit())
r |= bitMask;
}
@@ -303,7 +282,7 @@
void OneWire::read_bytes(uint8_t* buf, uint16_t count)
{
for (uint16_t i = 0; i < count; i++)
- buf[i] = read();
+ buf[i] = read_byte();
}
//
@@ -314,9 +293,9 @@
{
uint8_t i;
- write(0x55); // Choose ROM
+ write_byte(0x55); // Choose ROM
for (i = 0; i < 8; i++)
- write(rom[i]);
+ write_byte(rom[i]);
}
//
@@ -325,7 +304,7 @@
//
void OneWire::skip()
{
- write(0xCC); // Skip ROM
+ write_byte(0xCC); // Skip ROM
}
/**
@@ -336,11 +315,7 @@
*/
void OneWire::depower()
{
-#if defined(TARGET_STM)
- wire = 1;
-#else
- wire.input();
-#endif
+ INPUT();
}
#if ONEWIRE_SEARCH
@@ -422,7 +397,7 @@
}
// issue the search command
- write(0xF0);
+ write_byte(0xF0);
// loop to do the search
do {
@@ -530,3 +505,6 @@
return crc;
}
#endif
+
+
+