EE 308: Microcontrollers
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1 EE 308: Microcontrollers Serial Perpherial Interface (SPI) Aly El-Osery Electrical Engineering Department New Mexico Institute of Mining and Technology Socorro, New Mexico, USA April 9, 2018 Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
2 Why? Need to communicate with other devices, microcontrollers, or computer Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
3 Types Serial vs parallel Synchronous vs asynchronous One-to-one vs bus Full-duplex vs half-duplex Single-ended vs differential Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
4 Overview Synchronous master/slave Full duplex Four single ended-ended lines MOSI Master Out/Slave In (used by master to transmit data) MISO Master In/Slave Out (used by slave to transmit to master) SCK System Clock transmitted by master SS Slave Select (master address the slave by driving this line low) Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
5 Serial Peripheral Interface Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
6 SPI master/slave Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
7 Operation Master SS is handled by software SPI start by writing a byte to the SPDR After transmitting one byte the SPI clock generator stops (if interrupt flag is set, interrupt is requested) Can start the process over by sending another byte of pull SS high Slave If SS is high, slave is sleeping Data can be transferred to the SPDR When SS is low, data is shifted out SPIF is set (if interrupt is enabled, an interrupt is requested) Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
8 Pin overrides Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
9 SPI modes Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
10 SPI clock phase Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
11 Registers SPCR SPI Control Register (enable, interrupt enable, data direction, master/slave, clock polarity, clock phase, clock rate) SPSR SPI Status Register (interrupt flag, write collision flag, double speed) SPDR SPI Data Register Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
12 Assembly code (master mode) SPI_MasterInit : ; Set MOSI and SCK output, all others input ldi r17,(1 < < DD_MOSI ) (1 < < DD_SCK ) out DDR_SPI, r17 ; Enable SPI, Master, set clock rate fck/16 ldi r17,(1 < < SPE ) (1 < < MSTR ) (1 < < SPR0 ) out SPCR, r17 ret SPI_MasterTransmit : ; Start transmission of data (r16) out SPDR, r16 Wait_Transmit : ; Wait for transmission complete in r16, SPSR sbrs r16, SPIF rjmp Wait_Transmit ret Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
13 Assembly code (master mode) SPI_MasterInit : ; Set MOSI and SCK output, all others input ldi r17,(1 < < DD_MOSI ) (1 < < DD_SCK ) out DDR_SPI, r17 ; Enable SPI, Master, set clock rate fck/16 ldi r17,(1 < < SPE ) (1 < < MSTR ) (1 < < SPR0 ) out SPCR, r17 ret SPI_MasterTransmit : ; Start transmission of data (r16) out SPDR, r16 Wait_Transmit : ; Wait for transmission complete in r16, SPSR sbrs r16, SPIF rjmp Wait_Transmit ret does this work for ATmega1284!!, why or why not? atmel atmega1284_datasheet.pdf Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
14 C code (master mode) void SPI_ MasterInit ( void ) { / Set MOSI and SCK output, all others input / DDR_SPI = (1<< DD_MOSI ) (1 < < DD_SCK ); / Enable SPI, Master, set clock rate fck/16 / SPCR = (1<< SPE ) (1 < < MSTR ) (1 < < SPR0 ); } void SPI_ MasterTransmit ( char cdata ) { / Start transmission / SPDR = cdata ; / Wait for transmission complete / while (!( SPSR & (1<< SPIF ))) ; } Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
15 C code (master mode) void SPI_ MasterInit ( void ) { / Set MOSI and SCK output, all others input / DDR_SPI = (1<< DD_MOSI ) (1 < < DD_SCK ); / Enable SPI, Master, set clock rate fck/16 / SPCR = (1<< SPE ) (1 < < MSTR ) (1 < < SPR0 ); } void SPI_ MasterTransmit ( char cdata ) { / Start transmission / SPDR = cdata ; / Wait for transmission complete / while (!( SPSR & (1<< SPIF ))) ; } does this work for ATmega1284!!, why or why not? atmel atmega1284_datasheet.pdf Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
16 Assembly code (slave mode) SPI_SlaveInit : ; Set MISO output, all others input ldi r17,(1 < < DD_MISO ) out DDR_SPI, r17 ; Enable SPI ldi r17,(1 < < SPE ) out SPCR, r17 ret SPI_SlaveReceive : ; Wait for reception complete in r16, SPSR sbrs r16, SPIF rjmp SPI_SlaveReceive ; Read received data and return in r16, SPDR ret Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
17 Assembly code (slave mode) SPI_SlaveInit : ; Set MISO output, all others input ldi r17,(1 < < DD_MISO ) out DDR_SPI, r17 ; Enable SPI ldi r17,(1 < < SPE ) out SPCR, r17 ret SPI_SlaveReceive : ; Wait for reception complete in r16, SPSR sbrs r16, SPIF rjmp SPI_SlaveReceive ; Read received data and return in r16, SPDR ret does this work for ATmega1284!!, why or why not? atmel atmega1284_datasheet.pdf Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
18 C code (slave mode) void SPI_ SlaveInit ( void ) { / Set MISO output, all others input / DDR_SPI = (1 < < DD_MISO ); / Enable SPI / SPCR = (1<< SPE ); } char SPI_ SlaveReceive ( void ) { / Wait for reception complete / while (!( SPSR & (1<< SPIF ))) ; / Return Data Register / return SPDR ; } Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
19 C code (slave mode) void SPI_ SlaveInit ( void ) { / Set MISO output, all others input / DDR_SPI = (1 < < DD_MISO ); / Enable SPI / SPCR = (1<< SPE ); } char SPI_ SlaveReceive ( void ) { / Wait for reception complete / while (!( SPSR & (1<< SPIF ))) ; / Return Data Register / return SPDR ; } does this work for ATmega1284!!, why or why not? atmel atmega1284_datasheet.pdf Aly El-Osery (NMT) EE 308: Microcontrollers April 9, / 15
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