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WireKinetis.h
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/* Wire Library for Teensy LC & 3.X
* Copyright (c) 2014-2017, Paul Stoffregen, [email protected]
*
* Development of this I2C library was funded by PJRC.COM, LLC by sales of
* Teensy and related products. Please support PJRC's efforts to develop
* open source software by purchasing Teensy or other PJRC products.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice, development funding notice, and this permission
* notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef TwoWireKinetis_h
#define TwoWireKinetis_h
#if defined(__arm__) && defined(TEENSYDUINO) && (defined(__MKL26Z64__) || defined(__MK20DX128__) || defined(__MK20DX256__) || defined(__MK64FX512__) || defined(__MK66FX1M0__))
#include <Arduino.h>
#include <stdint.h>
#if defined(__MKL26Z64__) || defined(__MK20DX128__)
#define BUFFER_LENGTH 40
#elif defined(__MK20DX256__)
#define BUFFER_LENGTH 72
#else
#define BUFFER_LENGTH 136
#endif
#define WIRE_HAS_END 1
// WIRE_INTERFACES_COUNT is defined in core library pins_arduino.h
#if WIRE_INTERFACES_COUNT >= 1
#define WIRE_IMPLEMENT_WIRE
#endif
#if WIRE_INTERFACES_COUNT >= 2
#define WIRE_IMPLEMENT_WIRE1
#endif
#if WIRE_INTERFACES_COUNT >= 3
#define WIRE_IMPLEMENT_WIRE2
#endif
#if WIRE_INTERFACES_COUNT >= 4
#define WIRE_IMPLEMENT_WIRE3
#endif
// Teensy LC
#if defined(__MKL26Z64__)
#define WIRE_HAS_STOP_INTERRUPT
// Teensy 3.0
#elif defined(__MK20DX128__)
// Teensy 3.1 & 3.2
#elif defined(__MK20DX256__)
// Teensy 3.5
#elif defined(__MK64FX512__)
#define WIRE_HAS_START_INTERRUPT
#define WIRE_HAS_STOP_INTERRUPT
// Teensy 3.6
#elif defined(__MK66FX1M0__)
#define WIRE_HAS_START_INTERRUPT
#define WIRE_HAS_STOP_INTERRUPT
#endif
class TwoWire : public Stream
{
public:
// Hardware description struct
typedef struct {
uintptr_t clock_gate_register;
uint32_t clock_gate_mask;
uint8_t sda_pin[5];
uint8_t sda_mux[5];
uint8_t scl_pin[5];
uint8_t scl_mux[5];
IRQ_NUMBER_t irq;
} I2C_Hardware_t;
static const I2C_Hardware_t i2c0_hardware;
static const I2C_Hardware_t i2c1_hardware;
static const I2C_Hardware_t i2c2_hardware;
static const I2C_Hardware_t i2c3_hardware;
public:
constexpr TwoWire(uintptr_t port_addr, const I2C_Hardware_t &myhardware)
: port_addr(port_addr), hardware(myhardware) {
}
friend uintptr_t Teensyduino_Test_constinit_Wire(int instance, int index);
void begin();
void begin(uint8_t address);
void begin(int address) {
begin((uint8_t)address);
}
void end();
void setClock(uint32_t frequency);
void setSDA(uint8_t pin);
void setSCL(uint8_t pin);
void beginTransmission(uint8_t address) {
txBuffer[0] = (address << 1);
transmitting = 1;
txBufferLength = 1;
}
void beginTransmission(int address) {
beginTransmission((uint8_t)address);
}
uint8_t endTransmission(uint8_t sendStop);
uint8_t endTransmission(void) {
return endTransmission(1);
}
uint8_t requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop);
uint8_t requestFrom(uint8_t address, uint8_t quantity, bool sendStop) {
return requestFrom(address, quantity, (uint8_t)(sendStop ? 1 : 0));
}
uint8_t requestFrom(uint8_t address, uint8_t quantity) {
return requestFrom(address, quantity, (uint8_t)1);
}
uint8_t requestFrom(int address, int quantity, int sendStop) {
return requestFrom((uint8_t)address, (uint8_t)quantity,
(uint8_t)(sendStop ? 1 : 0));
}
uint8_t requestFrom(int address, int quantity) {
return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)1);
}
uint8_t requestFrom(uint8_t addr, uint8_t qty, uint32_t iaddr, uint8_t n, uint8_t stop);
virtual size_t write(uint8_t data);
virtual size_t write(const uint8_t *data, size_t quantity);
virtual int available(void) {
return rxBufferLength - rxBufferIndex;
}
virtual int read(void) {
if (rxBufferIndex >= rxBufferLength) return -1;
return rxBuffer[rxBufferIndex++];
}
virtual int peek(void) {
if (rxBufferIndex >= rxBufferLength) return -1;
return rxBuffer[rxBufferIndex];
}
virtual void flush(void) {
}
void onReceive(void (*function)(int numBytes)) {
user_onReceive = function;
}
void onRequest(void (*function)(void)) {
user_onRequest = function;
}
// send() for compatibility with very old sketches and libraries
void send(uint8_t b) {
write(b);
}
void send(uint8_t *s, uint8_t n) {
write(s, n);
}
void send(int n) {
write((uint8_t)n);
}
void send(char *s) {
write(s);
}
uint8_t receive(void) {
int c = read();
if (c < 0) return 0;
return c;
}
size_t write(unsigned long n) {
return write((uint8_t)n);
}
size_t write(long n) {
return write((uint8_t)n);
}
size_t write(unsigned int n) {
return write((uint8_t)n);
}
size_t write(int n) {
return write((uint8_t)n);
}
using Print::write;
private:
KINETIS_I2C_t& port() { return (*(KINETIS_I2C_t *) port_addr); }
uint8_t i2c_status(void) {
return port().S;
}
void isr(void);
bool wait_idle(void);
uintptr_t port_addr;
const I2C_Hardware_t &hardware;
uint8_t rxBuffer[BUFFER_LENGTH] = {};
uint8_t rxBufferIndex = 0;
uint8_t rxBufferLength = 0;
uint8_t txAddress = 0;
uint8_t txBuffer[BUFFER_LENGTH+1] = {};
uint8_t txBufferIndex = 0;
uint8_t txBufferLength = 0;
uint8_t transmitting = 0;
uint8_t slave_mode = 0;
uint8_t irqcount = 0;
uint8_t sda_pin_index = 0;
uint8_t scl_pin_index = 0;
void onRequestService(void);
void onReceiveService(uint8_t*, int);
void (*user_onRequest)(void) = nullptr;
void (*user_onReceive)(int) = nullptr;
void sda_rising_isr(void);
friend void i2c0_isr(void);
friend void i2c1_isr(void);
friend void i2c2_isr(void);
friend void i2c3_isr(void);
friend void sda_rising_isr0(void);
friend void sda_rising_isr1(void);
};
#ifdef WIRE_IMPLEMENT_WIRE
extern TwoWire Wire;
#endif
#ifdef WIRE_IMPLEMENT_WIRE1
extern TwoWire Wire1;
#endif
#ifdef WIRE_IMPLEMENT_WIRE2
extern TwoWire Wire2;
#endif
#ifdef WIRE_IMPLEMENT_WIRE3
extern TwoWire Wire3;
#endif
class TWBRemulation
{
public:
inline TWBRemulation & operator = (int val) __attribute__((always_inline)) {
if (val == 12 || val == ((F_CPU / 400000) - 16) / 2) { // 22, 52, 112
I2C0_C1 = 0;
#if F_BUS == 128000000
I2C0_F = I2C_F_DIV320; // 400 kHz
#elif F_BUS == 120000000
I2C0_F = I2C_F_DIV288; // 416 kHz
#elif F_BUS == 108000000
I2C0_F = I2C_F_DIV256; // 422 kHz
#elif F_BUS == 96000000
I2C0_F = I2C_F_DIV240; // 400 kHz
#elif F_BUS == 90000000
I2C0_F = I2C_F_DIV224; // 402 kHz
#elif F_BUS == 80000000
I2C0_F = I2C_F_DIV192; // 416 kHz
#elif F_BUS == 72000000
I2C0_F = I2C_F_DIV192; // 375 kHz
#elif F_BUS == 64000000
I2C0_F = I2C_F_DIV160; // 400 kHz
#elif F_BUS == 60000000
I2C0_F = I2C_F_DIV144; // 416 kHz
#elif F_BUS == 56000000
I2C0_F = I2C_F_DIV144; // 389 kHz
#elif F_BUS == 54000000
I2C0_F = I2C_F_DIV128; // 422 kHz
#elif F_BUS == 48000000
I2C0_F = I2C_F_DIV112; // 400 kHz
#elif F_BUS == 40000000
I2C0_F = I2C_F_DIV96; // 416 kHz
#elif F_BUS == 36000000
I2C0_F = I2C_F_DIV96; // 375 kHz
#elif F_BUS == 24000000
I2C0_F = I2C_F_DIV64; // 375 kHz
#elif F_BUS == 16000000
I2C0_F = I2C_F_DIV40; // 400 kHz
#elif F_BUS == 8000000
I2C0_F = I2C_F_DIV20; // 400 kHz
#elif F_BUS == 4000000
I2C0_F = I2C_F_DIV20; // 200 kHz
#elif F_BUS == 2000000
I2C0_F = I2C_F_DIV20; // 100 kHz
#endif
I2C0_C1 = I2C_C1_IICEN;
} else if (val == 72 || val == ((F_CPU / 100000) - 16) / 2) { // 112, 232, 472
I2C0_C1 = 0;
#if F_BUS == 128000000
I2C0_F = I2C_F_DIV1280; // 100 kHz
#elif F_BUS == 120000000
I2C0_F = I2C_F_DIV1152; // 104 kHz
#elif F_BUS == 108000000
I2C0_F = I2C_F_DIV1024; // 105 kHz
#elif F_BUS == 96000000
I2C0_F = I2C_F_DIV960; // 100 kHz
#elif F_BUS == 90000000
I2C0_F = I2C_F_DIV896; // 100 kHz
#elif F_BUS == 80000000
I2C0_F = I2C_F_DIV768; // 104 kHz
#elif F_BUS == 72000000
I2C0_F = I2C_F_DIV640; // 112 kHz
#elif F_BUS == 64000000
I2C0_F = I2C_F_DIV640; // 100 kHz
#elif F_BUS == 60000000
I2C0_F = I2C_F_DIV576; // 104 kHz
#elif F_BUS == 56000000
I2C0_F = I2C_F_DIV512; // 109 kHz
#elif F_BUS == 54000000
I2C0_F = I2C_F_DIV512; // 105 kHz
#elif F_BUS == 48000000
I2C0_F = I2C_F_DIV480; // 100 kHz
#elif F_BUS == 40000000
I2C0_F = I2C_F_DIV384; // 104 kHz
#elif F_BUS == 36000000
I2C0_F = I2C_F_DIV320; // 113 kHz
#elif F_BUS == 24000000
I2C0_F = I2C_F_DIV240; // 100 kHz
#elif F_BUS == 16000000
I2C0_F = I2C_F_DIV160; // 100 kHz
#elif F_BUS == 8000000
I2C0_F = I2C_F_DIV80; // 100 kHz
#elif F_BUS == 4000000
I2C0_F = I2C_F_DIV40; // 100 kHz
#elif F_BUS == 2000000
I2C0_F = I2C_F_DIV20; // 100 kHz
#endif
I2C0_C1 = I2C_C1_IICEN;
}
return *this;
}
inline operator int () const __attribute__((always_inline)) {
#if F_BUS == 128000000
if (I2C0_F == I2C_F_DIV320) return 12;
#elif F_BUS == 120000000
if (I2C0_F == I2C_F_DIV288) return 12;
#elif F_BUS == 108000000
if (I2C0_F == I2C_F_DIV256) return 12;
#elif F_BUS == 96000000
if (I2C0_F == I2C_F_DIV240) return 12;
#elif F_BUS == 90000000
if (I2C0_F == I2C_F_DIV224) return 12;
#elif F_BUS == 80000000
if (I2C0_F == I2C_F_DIV192) return 12;
#elif F_BUS == 72000000
if (I2C0_F == I2C_F_DIV192) return 12;
#elif F_BUS == 64000000
if (I2C0_F == I2C_F_DIV160) return 12;
#elif F_BUS == 60000000
if (I2C0_F == I2C_F_DIV144) return 12;
#elif F_BUS == 56000000
if (I2C0_F == I2C_F_DIV144) return 12;
#elif F_BUS == 54000000
if (I2C0_F == I2C_F_DIV128) return 12;
#elif F_BUS == 48000000
if (I2C0_F == I2C_F_DIV112) return 12;
#elif F_BUS == 40000000
if (I2C0_F == I2C_F_DIV96) return 12;
#elif F_BUS == 36000000
if (I2C0_F == I2C_F_DIV96) return 12;
#elif F_BUS == 24000000
if (I2C0_F == I2C_F_DIV64) return 12;
#elif F_BUS == 16000000
if (I2C0_F == I2C_F_DIV40) return 12;
#elif F_BUS == 8000000
if (I2C0_F == I2C_F_DIV20) return 12;
#elif F_BUS == 4000000
if (I2C0_F == I2C_F_DIV20) return 12;
#endif
return 72;
}
};
extern TWBRemulation TWBR;
#endif
#endif