From: Adrian Weber Date: Thu, 4 Mar 2021 16:14:19 +0000 (+0100) Subject: preparation of driver for switch to DS2482 in CBM rich sensor readout X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=fc8fbac33848ca0e277f51862d2ca911f3f3efcd;p=avr.git preparation of driver for switch to DS2482 in CBM rich sensor readout --- diff --git a/atmega32u4/CbmRich_sensoring/Makefile b/atmega32u4/CbmRich_sensoring/Makefile index 3c8a62d..84bfab7 100644 --- a/atmega32u4/CbmRich_sensoring/Makefile +++ b/atmega32u4/CbmRich_sensoring/Makefile @@ -8,7 +8,8 @@ MCU = atmega32u4 FORMAT = ihex TARGET = main -SRC = $(TARGET).c usb_serial.c lib/1wire/drivers/ow_driver_avr_gpio.c lib/1wire/dallas/dallas.c lib/1wire/onewire/onewire.c DS28E17/DS28E17.c MLX90393/MLX90393.c +SRC = $(TARGET).c usb_serial.c driver_DS2482_800/ow_driver_avr_ds2482.c lib/1wire/dallas/dallas.c lib/1wire/onewire/onewire.c DS28E17/DS28E17.c MLX90393/MLX90393.c ./twi/twi.c +#SRC = $(TARGET).c usb_serial.c lib/1wire/drivers/ow_driver_avr_gpio.c lib/1wire/dallas/dallas.c lib/1wire/onewire/onewire.c DS28E17/DS28E17.c MLX90393/MLX90393.c ASRC = OPT = 2 PORT=/dev/ttyACM0 @@ -33,7 +34,7 @@ CDEFS = -DF_CPU=8000000 # Place -I options here #CINCS = -CINCS = -I. -I./lib/1wire/dallas -I./lib/1wire/onewire -I./lib/1wire/drivers -I./DS28E17 -I./MLX90393 +CINCS = -I. -I./lib/1wire/dallas -I./lib/1wire/onewire -I./lib/1wire/drivers -I./DS28E17 -I./MLX90393 -I./driver_DS2482_800 -I./twi/ CDEBUG = -g$(DEBUG) diff --git a/atmega32u4/CbmRich_sensoring/driver_DS2482_800/ow_driver_avr_ds2482.c b/atmega32u4/CbmRich_sensoring/driver_DS2482_800/ow_driver_avr_ds2482.c new file mode 100644 index 0000000..bfa6d5f --- /dev/null +++ b/atmega32u4/CbmRich_sensoring/driver_DS2482_800/ow_driver_avr_ds2482.c @@ -0,0 +1,85 @@ +#include +#include +#include + +#include "ow_driver.h" +#include "ow_driver_avr_ds2482.h" +#include "twi.h" + + +struct one_wire_driver { + volatile uint8_t* port; + uint8_t pin; + uint8_t adr; +}; + +struct one_wire_driver one_wire_heap[OW_HEAP_SIZE]; +static int heap_ptr = 0; + +int init_driver(ow_driver_ptr *driver, int adr) +{ + if (heap_ptr > OW_HEAP_SIZE) { + return OW_NOMEMORY; + } + *driver = &one_wire_heap[heap_ptr++]; + ow_driver_ptr d = *driver; + #if defined(__AVR_ATmega32U4__) + d->port = &PORTD; // PD1 + d->pin = 1; + #else + d->port = 0; + d->pin = 0; + #endif + + d->adr = adr; + //twi_setFrequency(100000000); + + return OW_OK; +} +int reset_wire(ow_driver_ptr d) +{ + uint8_t ow_presence; + + //DDR(*d->port) &= ~d->pin; // Input mode + + // Send RESET puls via I2C. + + OW_YIELD; + + return ow_presence; +} + +int write_bit(ow_driver_ptr d, uint8_t bit) +{ + //DS2482 write bit functionality + + OW_YIELD; + + return OW_OK; +} + +int read_bit(ow_driver_ptr d, uint8_t *rbit) +{ + //DS2482 read bit functionality + + delay_us(53); + + return OW_OK; +} + +int write_byte(ow_driver_ptr d, uint8_t byte) +{ + //DS2482 write byte functionality + + return OW_OK; +} + +int read_byte(ow_driver_ptr d, uint8_t *rbyte) +{ + //DS2482 read byte functionality + + OW_YIELD; + + return OW_OK; +} + diff --git a/atmega32u4/CbmRich_sensoring/driver_DS2482_800/ow_driver_avr_ds2482.h b/atmega32u4/CbmRich_sensoring/driver_DS2482_800/ow_driver_avr_ds2482.h new file mode 100644 index 0000000..c120b27 --- /dev/null +++ b/atmega32u4/CbmRich_sensoring/driver_DS2482_800/ow_driver_avr_ds2482.h @@ -0,0 +1,17 @@ +#ifndef OW_DRIVER_AVR_DS2482_H_ +#define OW_DRIVER_AVR_DS2482_H_ + +/* It is generally not a good idea to use malloc in embedded systems. So the library allocates + * predefined size of static memory to put driver structures in. Decide how many GPIO pins + * you'll be using as One Wire masters. Usually 1 is sufficient for small amount of sensors. + */ +#define OW_HEAP_SIZE 2 + + +/** + * External function providing microseconds delay + */ +extern void delay_us(uint32_t); + + +#endif /* OW_DRIVER_AVR_DS2482_H_ */ diff --git a/atmega32u4/CbmRich_sensoring/main.c b/atmega32u4/CbmRich_sensoring/main.c index 9308089..37d62f0 100644 --- a/atmega32u4/CbmRich_sensoring/main.c +++ b/atmega32u4/CbmRich_sensoring/main.c @@ -8,7 +8,8 @@ #include #include "ow_driver.h" -#include "ow_driver_avr_gpio.h" +//#include "ow_driver_avr_gpio.h" +#include "ow_driver_avr_ds2482.h" #include "onewire.h" #include "dallas.h" #include "DS28E17.h" @@ -17,6 +18,7 @@ #include #include +#include "./twi/twi.h" #define FIRMWARE_VERSION 0x001 @@ -155,16 +157,21 @@ int main(void) { ow_driver_ptr driver_Q[3]; owu_struct_t ow_Q[3]; + //twi_init(); + sei(); // 1-wire init - init_driver(&driver_Q[0], E_PORTD+1); // AVR PD3 + //init_driver(&driver_Q[0], E_PORTD+1); // AVR PD3 + init_driver(&driver_Q[0], 0x18); // I2C Address owu_init(&ow_Q[0], driver_Q[0]); - init_driver(&driver_Q[1], E_PORTD+7); // AVR PD4 + //init_driver(&driver_Q[1], E_PORTD+7); // AVR PD4 + init_driver(&driver_Q[0], 0x19); // I2C Address owu_init(&ow_Q[1], driver_Q[1]); - init_driver(&driver_Q[2], E_PORTD+4); // AVR PD5 + //init_driver(&driver_Q[2], E_PORTD+4); // AVR PD5 + init_driver(&driver_Q[0], 0x18); // I2C Address owu_init(&ow_Q[2], driver_Q[2]); //SPI INIT @@ -488,4 +495,4 @@ void send_Values(uint8_t line , uint8_t devNbr, uint8_t valType, uint16_t value) // Transmit txbuf via UART UCSR1B |= (1<< UDRIE1); -} \ No newline at end of file +} diff --git a/atmega32u4/CbmRich_sensoring/twi/twi.c b/atmega32u4/CbmRich_sensoring/twi/twi.c new file mode 100644 index 0000000..89f182e --- /dev/null +++ b/atmega32u4/CbmRich_sensoring/twi/twi.c @@ -0,0 +1,571 @@ +/* + twi.c - TWI/I2C library for Atmega32U4 + + Copyright (c) 2006 Nicholas Zambetti. All right reserved. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts + + Modified 2017 by Adrian Weber to use I2C without Arduino librarys +*/ + +#include +#include +#include +#include +#include +#include +#include + +#ifndef cbi +#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit)) +#endif + +#ifndef sbi +#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit)) +#endif +#include "twi.h" + +static volatile uint8_t twi_state; +static volatile uint8_t twi_slarw; +static volatile uint8_t twi_sendStop; // should the transaction end with a stop +static volatile uint8_t twi_inRepStart; // in the middle of a repeated start + +static void (*twi_onSlaveTransmit)(void); +static void (*twi_onSlaveReceive)(uint8_t*, int); + +static uint8_t twi_masterBuffer[TWI_BUFFER_LENGTH]; +static volatile uint8_t twi_masterBufferIndex; +static volatile uint8_t twi_masterBufferLength; + +static uint8_t twi_txBuffer[TWI_BUFFER_LENGTH]; +static volatile uint8_t twi_txBufferIndex; +static volatile uint8_t twi_txBufferLength; + +static uint8_t twi_rxBuffer[TWI_BUFFER_LENGTH]; +static volatile uint8_t twi_rxBufferIndex; + +static volatile uint8_t twi_error; + + +/* + * Function twi_init + * Desc readys twi pins and sets twi bitrate + * Input none + * Output none + */ +void twi_init(void) +{ + // initialize state + twi_state = TWI_READY; + twi_sendStop = true; // default value + twi_inRepStart = false; + + // activate internal pullups for twi. + DDRD |= (0 << 1); + DDRD |= (0 << 0); + PORTD |= (1 << 1); + PORTD |= (1 << 0); + + // initialize twi prescaler and bit rate + cbi(TWSR, TWPS0); + cbi(TWSR, TWPS1); + TWBR = ((F_CPU / TWI_FREQ) - 16) / 2; + + sei(); + + /* twi bit rate formula from atmega128 manual pg 204 + SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR)) + note: TWBR should be 10 or higher for master mode + It is 72 for a 16mhz Wiring board with 100kHz TWI */ + + // enable twi module, acks, and twi interrupt + TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA); +} + +/* + * Function twi_disable + * Desc disables twi pins + * Input none + * Output none + */ +void twi_disable(void) +{ + // disable twi module, acks, and twi interrupt + TWCR &= ~(_BV(TWEN) | _BV(TWIE) | _BV(TWEA)); + + // deactivate internal pullups for twi. + DDRD |= (1 << 0); + DDRD |= (1 << 1); + PORTD |= (1 << 0); + PORTD |= (1 << 1); + +} + +/* + * Function twi_slaveInit + * Desc sets slave address and enables interrupt + * Input none + * Output none + */ +void twi_setAddress(uint8_t address) +{ + // set twi slave address (skip over TWGCE bit) + TWAR = address << 1; +} + +/* + * Function twi_setClock + * Desc sets twi bit rate + * Input Clock Frequency + * Output none + */ +void twi_setFrequency(uint32_t frequency) +{ + TWBR = ((F_CPU / frequency) - 16) / 2; + + /* twi bit rate formula from atmega128 manual pg 204 + SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR)) + note: TWBR should be 10 or higher for master mode + It is 72 for a 16mhz Wiring board with 100kHz TWI */ +} + +/* + * Function twi_readFrom + * Desc attempts to become twi bus master and read a + * series of bytes from a device on the bus + * Input address: 7bit i2c device address + * data: pointer to byte array + * length: number of bytes to read into array + * sendStop: Boolean indicating whether to send a stop at the end + * Output number of bytes read + */ +uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop) +{ + uint8_t i; + + // ensure data will fit into buffer + if(TWI_BUFFER_LENGTH < length){ + return 0; + } + // wait until twi is ready, become master receiver + while(TWI_READY != twi_state){ + continue; + } + twi_state = TWI_MRX; + twi_sendStop = sendStop; + // reset error state (0xFF.. no error occured) + twi_error = 0xFF; + + // initialize buffer iteration vars + twi_masterBufferIndex = 0; + twi_masterBufferLength = length-1; // This is not intuitive, read on... + // On receive, the previously configured ACK/NACK setting is transmitted in + // response to the received byte before the interrupt is signalled. + // Therefor we must actually set NACK when the _next_ to last byte is + // received, causing that NACK to be sent in response to receiving the last + // expected byte of data. + + // build sla+w, slave device address + w bit + twi_slarw = TW_READ; + twi_slarw |= address << 1; + + if (true == twi_inRepStart) { + // if we're in the repeated start state, then we've already sent the start, + // (@@@ we hope), and the TWI statemachine is just waiting for the address byte. + // We need to remove ourselves from the repeated start state before we enable interrupts, + // since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning + // up. Also, don't enable the START interrupt. There may be one pending from the + // repeated start that we sent ourselves, and that would really confuse things. + twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR + do { + TWDR = twi_slarw; + } while(TWCR & _BV(TWWC)); + TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START + } + else + // send start condition + TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTA); + + // wait for read operation to complete + while(TWI_MRX == twi_state){ + continue; + } + + if (twi_masterBufferIndex < length) + length = twi_masterBufferIndex; + + // copy twi buffer to data + for(i = 0; i < length; ++i){ + data[i] = twi_masterBuffer[i]; + } + + return length; +} + +/* + * Function twi_writeTo + * Desc attempts to become twi bus master and write a + * series of bytes to a device on the bus + * Input address: 7bit i2c device address + * data: pointer to byte array + * length: number of bytes in array + * wait: boolean indicating to wait for write or not + * sendStop: boolean indicating whether or not to send a stop at the end + * Output 0 .. success + * 1 .. length to long for buffer + * 2 .. address send, NACK received + * 3 .. data send, NACK received + * 4 .. other twi error (lost bus arbitration, bus error, ..) + */ +uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait, uint8_t sendStop) +{ + uint8_t i; + + // ensure data will fit into buffer + if(TWI_BUFFER_LENGTH < length){ + return 1; + } + + // wait until twi is ready, become master transmitter + while(TWI_READY != twi_state){ + continue; + } + twi_state = TWI_MTX; + twi_sendStop = sendStop; + // reset error state (0xFF.. no error occured) + twi_error = 0xFF; + + // initialize buffer iteration vars + twi_masterBufferIndex = 0; + twi_masterBufferLength = length; + + // copy data to twi buffer + for(i = 0; i < length; ++i){ + twi_masterBuffer[i] = data[i]; + } + + // build sla+w, slave device address + w bit + twi_slarw = TW_WRITE; + twi_slarw |= address << 1; + + + // if we're in a repeated start, then we've already sent the START + // in the ISR. Don't do it again. + // + if (true == twi_inRepStart) { + // if we're in the repeated start state, then we've already sent the start, + // (@@@ we hope), and the TWI statemachine is just waiting for the address byte. + // We need to remove ourselves from the repeated start state before we enable interrupts, + // since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning + // up. Also, don't enable the START interrupt. There may be one pending from the + // repeated start that we sent outselves, and that would really confuse things. + twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR + do { + TWDR = twi_slarw; + } while(TWCR & _BV(TWWC)); + TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START + } + else + // send start condition + TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE) | _BV(TWSTA); // enable INTs + + + // wait for write operation to complete + while(wait && (TWI_MTX == twi_state)){ + continue; + } + + if (twi_error == 0xFF) + return 0; // success + else if (twi_error == TW_MT_SLA_NACK) + return 2; // error: address send, nack received + else if (twi_error == TW_MT_DATA_NACK) + return 3; // error: data send, nack received + else + return 4; // other twi error +} + +/* + * Function twi_transmit + * Desc fills slave tx buffer with data + * must be called in slave tx event callback + * Input data: pointer to byte array + * length: number of bytes in array + * Output 1 length too long for buffer + * 2 not slave transmitter + * 0 ok + */ +uint8_t twi_transmit(const uint8_t* data, uint8_t length) +{ + uint8_t i; + + // ensure data will fit into buffer + if(TWI_BUFFER_LENGTH < length){ + return 1; + } + + // ensure we are currently a slave transmitter + if(TWI_STX != twi_state){ + return 2; + } + + // set length and copy data into tx buffer + twi_txBufferLength = length; + for(i = 0; i < length; ++i){ + twi_txBuffer[i] = data[i]; + } + + return 0; +} + +/* + * Function twi_attachSlaveRxEvent + * Desc sets function called before a slave read operation + * Input function: callback function to use + * Output none + */ +void twi_attachSlaveRxEvent( void (*function)(uint8_t*, int) ) +{ + twi_onSlaveReceive = function; +} + +/* + * Function twi_attachSlaveTxEvent + * Desc sets function called before a slave write operation + * Input function: callback function to use + * Output none + */ +void twi_attachSlaveTxEvent( void (*function)(void) ) +{ + twi_onSlaveTransmit = function; +} + +/* + * Function twi_reply + * Desc sends byte or readys receive line + * Input ack: byte indicating to ack or to nack + * Output none + */ +void twi_reply(uint8_t ack) +{ + // transmit master read ready signal, with or without ack + if(ack){ + TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT) | _BV(TWEA); + }else{ + TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT); + } +} + +/* + * Function twi_stop + * Desc relinquishes bus master status + * Input none + * Output none + */ +void twi_stop(void) +{ + // send stop condition + TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTO); + + // wait for stop condition to be exectued on bus + // TWINT is not set after a stop condition! + while(TWCR & _BV(TWSTO)){ + continue; + } + + // update twi state + twi_state = TWI_READY; +} + +/* + * Function twi_releaseBus + * Desc releases bus control + * Input none + * Output none + */ +void twi_releaseBus(void) +{ + // release bus + TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT); + + // update twi state + twi_state = TWI_READY; +} + +ISR(TWI_vect) +{ + switch(TW_STATUS){ + // All Master + case TW_START: // sent start condition + case TW_REP_START: // sent repeated start condition + // copy device address and r/w bit to output register and ack + TWDR = twi_slarw; + twi_reply(1); + break; + + // Master Transmitter + case TW_MT_SLA_ACK: // slave receiver acked address + case TW_MT_DATA_ACK: // slave receiver acked data + // if there is data to send, send it, otherwise stop + if(twi_masterBufferIndex < twi_masterBufferLength){ + // copy data to output register and ack + TWDR = twi_masterBuffer[twi_masterBufferIndex++]; + twi_reply(1); + }else{ + if (twi_sendStop) + twi_stop(); + else { + twi_inRepStart = true; // we're gonna send the START + // don't enable the interrupt. We'll generate the start, but we + // avoid handling the interrupt until we're in the next transaction, + // at the point where we would normally issue the start. + TWCR = _BV(TWINT) | _BV(TWSTA)| _BV(TWEN) ; + twi_state = TWI_READY; + } + } + break; + case TW_MT_SLA_NACK: // address sent, nack received + twi_error = TW_MT_SLA_NACK; + twi_stop(); + break; + case TW_MT_DATA_NACK: // data sent, nack received + twi_error = TW_MT_DATA_NACK; + twi_stop(); + break; + case TW_MT_ARB_LOST: // lost bus arbitration + twi_error = TW_MT_ARB_LOST; + twi_releaseBus(); + break; + + // Master Receiver + case TW_MR_DATA_ACK: // data received, ack sent + // put byte into buffer + twi_masterBuffer[twi_masterBufferIndex++] = TWDR; + case TW_MR_SLA_ACK: // address sent, ack received + // ack if more bytes are expected, otherwise nack + if(twi_masterBufferIndex < twi_masterBufferLength){ + twi_reply(1); + }else{ + twi_reply(0); + } + break; + case TW_MR_DATA_NACK: // data received, nack sent + // put final byte into buffer + twi_masterBuffer[twi_masterBufferIndex++] = TWDR; + if (twi_sendStop) + twi_stop(); + else { + twi_inRepStart = true; // we're gonna send the START + // don't enable the interrupt. We'll generate the start, but we + // avoid handling the interrupt until we're in the next transaction, + // at the point where we would normally issue the start. + TWCR = _BV(TWINT) | _BV(TWSTA)| _BV(TWEN) ; + twi_state = TWI_READY; + } + break; + case TW_MR_SLA_NACK: // address sent, nack received + twi_stop(); + break; + // TW_MR_ARB_LOST handled by TW_MT_ARB_LOST case + + // Slave Receiver + case TW_SR_SLA_ACK: // addressed, returned ack + case TW_SR_GCALL_ACK: // addressed generally, returned ack + case TW_SR_ARB_LOST_SLA_ACK: // lost arbitration, returned ack + case TW_SR_ARB_LOST_GCALL_ACK: // lost arbitration, returned ack + // enter slave receiver mode + twi_state = TWI_SRX; + // indicate that rx buffer can be overwritten and ack + twi_rxBufferIndex = 0; + twi_reply(1); + break; + case TW_SR_DATA_ACK: // data received, returned ack + case TW_SR_GCALL_DATA_ACK: // data received generally, returned ack + // if there is still room in the rx buffer + if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){ + // put byte in buffer and ack + twi_rxBuffer[twi_rxBufferIndex++] = TWDR; + twi_reply(1); + }else{ + // otherwise nack + twi_reply(0); + } + break; + case TW_SR_STOP: // stop or repeated start condition received + // ack future responses and leave slave receiver state + twi_releaseBus(); + // put a null char after data if there's room + if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){ + twi_rxBuffer[twi_rxBufferIndex] = '\0'; + } + // callback to user defined callback + twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex); + // since we submit rx buffer to "wire" library, we can reset it + twi_rxBufferIndex = 0; + break; + case TW_SR_DATA_NACK: // data received, returned nack + case TW_SR_GCALL_DATA_NACK: // data received generally, returned nack + // nack back at master + twi_reply(0); + break; + + // Slave Transmitter + case TW_ST_SLA_ACK: // addressed, returned ack + case TW_ST_ARB_LOST_SLA_ACK: // arbitration lost, returned ack + // enter slave transmitter mode + twi_state = TWI_STX; + // ready the tx buffer index for iteration + twi_txBufferIndex = 0; + // set tx buffer length to be zero, to verify if user changes it + twi_txBufferLength = 0; + // request for txBuffer to be filled and length to be set + // note: user must call twi_transmit(bytes, length) to do this + twi_onSlaveTransmit(); + // if they didn't change buffer & length, initialize it + if(0 == twi_txBufferLength){ + twi_txBufferLength = 1; + twi_txBuffer[0] = 0x00; + } + // transmit first byte from buffer, fall + case TW_ST_DATA_ACK: // byte sent, ack returned + // copy data to output register + TWDR = twi_txBuffer[twi_txBufferIndex++]; + // if there is more to send, ack, otherwise nack + if(twi_txBufferIndex < twi_txBufferLength){ + twi_reply(1); + }else{ + twi_reply(0); + } + break; + case TW_ST_DATA_NACK: // received nack, we are done + case TW_ST_LAST_DATA: // received ack, but we are done already! + // ack future responses + twi_reply(1); + // leave slave receiver state + twi_state = TWI_READY; + break; + + // All + case TW_NO_INFO: // no state information + break; + case TW_BUS_ERROR: // bus error, illegal stop/start + twi_error = TW_BUS_ERROR; + twi_stop(); + break; + } +} + diff --git a/atmega32u4/CbmRich_sensoring/twi/twi.h b/atmega32u4/CbmRich_sensoring/twi/twi.h new file mode 100644 index 0000000..be089ea --- /dev/null +++ b/atmega32u4/CbmRich_sensoring/twi/twi.h @@ -0,0 +1,52 @@ +/* + twi.h - TWI/I2C library for Wiring & Arduino + Copyright (c) 2006 Nicholas Zambetti. All right reserved. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +*/ + +#ifndef twi_h +#define twi_h + #include + + #ifndef TWI_FREQ + #define TWI_FREQ 100000L + #endif + + #ifndef TWI_BUFFER_LENGTH + #define TWI_BUFFER_LENGTH 32 + #endif + + #define TWI_READY 0 + #define TWI_MRX 1 + #define TWI_MTX 2 + #define TWI_SRX 3 + #define TWI_STX 4 + + void twi_init(void); + void twi_disable(void); + void twi_setAddress(uint8_t); + void twi_setFrequency(uint32_t); + uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t, uint8_t); + uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t, uint8_t); + uint8_t twi_transmit(const uint8_t*, uint8_t); + void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) ); + void twi_attachSlaveTxEvent( void (*)(void) ); + void twi_reply(uint8_t); + void twi_stop(void); + void twi_releaseBus(void); + +#endif +