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Diff: OneWire.h
- Revision:
- 14:2d0b5e0f0aed
- Parent:
- 13:016b84669050
--- a/OneWire.h Thu Apr 04 20:46:58 2019 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,189 +0,0 @@
-#ifndef OneWire_h
-#define OneWire_h
-
-#include <inttypes.h>
-#include <mbed.h>
-
-#if defined(TARGET_STM)
- #define MODE() output(); \
- mode(OpenDrain)
- #define OUTPUT() // configured as output in the constructor and stays like that forever
-#if defined(TARGET_STM32L072xx)
- #define PORT ((GPIO_TypeDef *)(GPIOA_BASE + 0x0400 * STM_PORT(gpio.pin)))
- #define PINMASK (1 << STM_PIN(gpio.pin))
- #define INPUT() (PORT->MODER &= ~(GPIO_MODER_MODE0_0 << (STM_PIN(gpio.pin) * 2)))
- #define READ() ((PORT->IDR & gpio.mask) != 0)
- #define WRITE(x) (x == 1 ? PORT->BSRR = PINMASK : PORT->BRR = PINMASK)
-#else
- #define INPUT() (*gpio.reg_set = gpio.mask) // write 1 to open drain
- #define READ() ((*gpio.reg_in & gpio.mask) != 0)
- #define WRITE(x) write(x)
-#endif
-#else
- #define MODE() mode(PullUp)
- #define INPUT() input()
- #define OUTPUT() output()
- #define READ() read()
- #define WRITE(x) write(x)
-#endif
-
-#ifdef TARGET_NORDIC
-//NORDIC targets (NRF) use software delays since their ticker uses a 32kHz clock
- static uint32_t loops_per_us = 0;
-
- #define INIT_WAIT init_soft_delay()
- #define WAIT_US(x) for(int cnt = 0; cnt < (x * loops_per_us) >> 5; cnt++) {__NOP(); __NOP(); __NOP();}
-
-void init_soft_delay( void ) {
- if (loops_per_us == 0) {
- loops_per_us = 1;
- Timer timey;
- timey.start();
- ONEWIRE_DELAY_US(320000);
- timey.stop();
- loops_per_us = (320000 + timey.read_us() / 2) / timey.read_us();
- }
-}
-#else
- #define INIT_WAIT
- #define WAIT_US(x) wait_us(x)
-#endif
-
-// You can exclude certain features from OneWire. In theory, this
-// might save some space. In practice, the compiler automatically
-// removes unused code (technically, the linker, using -fdata-sections
-// and -ffunction-sections when compiling, and Wl,--gc-sections
-// when linking), so most of these will not result in any code size
-// reduction. Well, unless you try to use the missing features
-// and redesign your program to not need them! ONEWIRE_CRC8_TABLE
-// is the exception, because it selects a fast but large algorithm
-// or a small but slow algorithm.
-
-// you can exclude onewire_search by defining that to 0
-#ifndef ONEWIRE_SEARCH
-#define ONEWIRE_SEARCH 1
-#endif
-
-// You can exclude CRC checks altogether by defining this to 0
-#ifndef ONEWIRE_CRC
-#define ONEWIRE_CRC 1
-#endif
-
-class OneWire : public DigitalInOut
-{
- Timer timer;
-
-#if ONEWIRE_SEARCH
- // global search state
- unsigned char ROM_NO[8];
- uint8_t LastDiscrepancy;
- uint8_t LastFamilyDiscrepancy;
- uint8_t LastDeviceFlag;
-#endif
-
-public:
- OneWire(PinName pin);
-
- // Perform a 1-Wire reset cycle. Returns 1 if a device responds
- // with a presence pulse. Returns 0 if there is no device or the
- // bus is shorted or otherwise held low for more than 250uS
- uint8_t reset(void);
-
- // Issue a 1-Wire rom select command, you do the reset first.
- void select(const uint8_t rom[8]);
-
- // Issue a 1-Wire rom skip command, to address all on bus.
- void skip(void);
-
- // Write a byte. If 'power' is one then the wire is held high at
- // the end for parasitically powered devices. You are responsible
- // for eventually depowering it by calling depower() or doing
- // another read or write.
- void write_byte(uint8_t v, uint8_t power = 0);
-
- void write_bytes(const uint8_t *buf, uint16_t count, bool power = 0);
-
- // Read a byte.
- uint8_t read_byte(void);
-
- void read_bytes(uint8_t *buf, uint16_t count);
-
- // Write a bit. The bus is always left powered at the end, see
- // note in write() about that.
- void write_bit(uint8_t v);
-
- // Read a bit.
- uint8_t read_bit(void);
-
- // Stop forcing power onto the bus. You only need to do this if
- // you used the 'power' flag to write() or used a write_bit() call
- // and aren't about to do another read or write. You would rather
- // not leave this powered if you don't have to, just in case
- // someone shorts your bus.
- void depower(void);
-
-#if ONEWIRE_SEARCH
- // Clear the search state so that if will start from the beginning again.
- void reset_search();
-
- // Setup the search to find the device type 'family_code' on the next call
- // to search(*newAddr) if it is present.
- void target_search(uint8_t family_code);
-
- // Look for the next device. Returns 1 if a new address has been
- // returned. A zero might mean that the bus is shorted, there are
- // no devices, or you have already retrieved all of them. It
- // might be a good idea to check the CRC to make sure you didn't
- // get garbage. The order is deterministic. You will always get
- // the same devices in the same order.
- uint8_t search(uint8_t *newAddr);
-#endif
-
-#if ONEWIRE_CRC
- // Compute a Dallas Semiconductor 8 bit CRC, these are used in the
- // ROM and scratchpad registers.
- static uint8_t crc8(const uint8_t *addr, uint8_t len);
-
-#if ONEWIRE_CRC16
- // Compute the 1-Wire CRC16 and compare it against the received CRC.
- // Example usage (reading a DS2408):
- // // Put everything in a buffer so we can compute the CRC easily.
- // uint8_t buf[13];
- // buf[0] = 0xF0; // Read PIO Registers
- // buf[1] = 0x88; // LSB address
- // buf[2] = 0x00; // MSB address
- // WriteBytes(net, buf, 3); // Write 3 cmd bytes
- // ReadBytes(net, buf+3, 10); // Read 6 data bytes, 2 0xFF, 2 CRC16
- // if (!CheckCRC16(buf, 11, &buf[11])) {
- // // Handle error.
- // }
- //
- // @param input - Array of bytes to checksum.
- // @param len - How many bytes to use.
- // @param inverted_crc - The two CRC16 bytes in the received data.
- // This should just point into the received data,
- // *not* at a 16-bit integer.
- // @param crc - The crc starting value (optional)
- // @return True, iff the CRC matches.
- static bool check_crc16(const uint8_t* input, uint16_t len, const uint8_t* inverted_crc, uint16_t crc = 0);
-
- // Compute a Dallas Semiconductor 16 bit CRC. This is required to check
- // the integrity of data received from many 1-Wire devices. Note that the
- // CRC computed here is *not* what you'll get from the 1-Wire network,
- // for two reasons:
- // 1) The CRC is transmitted bitwise inverted.
- // 2) Depending on the endian-ness of your processor, the binary
- // representation of the two-byte return value may have a different
- // byte order than the two bytes you get from 1-Wire.
- // @param input - Array of bytes to checksum.
- // @param len - How many bytes to use.
- // @param crc - The crc starting value (optional)
- // @return The CRC16, as defined by Dallas Semiconductor.
- static uint16_t crc16(const uint8_t* input, uint16_t len, uint16_t crc = 0);
-#endif
-#endif
-};
-
-#endif
-
-