UartSpi.h File Reference

#include <stdint.h>
#include "ReadWriteBits.h"

Go to the source code of this file.

Typedefs
typedef uint8_t volatile *const	uspi_ptr
typedef uint16_t volatile *const	uspi_ptr16
typedef uint8_t const	uspi_pin
typedef uint8_t const	uspi_bit

Functions
void	RunSpiAt5Mhz (void)
void	SetSckAsOutput (void)
void	AdcConvIdleLow (void)
void	SetAdcConvAsOutput (void)
void	EnableAtmega328UsartInSpiMasterMode (void)
void	UseSpiDataModeCpol1CPha1 (void)
void	CfgSpiToTransferMsbFirst (void)
void	GiveSpiControlOverMisoAndMosiPins (void)
void	SpiMasterCfg (void)
void	UartSpiInit (void)
void	StartAdcConversion (void)
void	StartAdcReadout (void)

Variables
uspi_ptr	UartSpi_ddr
uspi_ptr	UartSpi_port
uspi_ptr	UartSpi_UCSR0A
uspi_ptr	UartSpi_UCSR0B
uspi_ptr	UartSpi_UCSR0C
uspi_ptr	UartSpi_UDR0
uspi_ptr16	UartSpi_UBRR0
uspi_pin	UartSpi_Miso
uspi_pin	UartSpi_AdcConv
uspi_pin	UartSpi_Sck
uspi_bit	UartSpi_UMSEL00
uspi_bit	UartSpi_UMSEL01
uspi_bit	UartSpi_RXEN0
uspi_bit	UartSpi_TXEN0
uspi_bit	UartSpi_UCPOL0
uspi_bit	UartSpi_UCPHA0
uspi_bit	UartSpi_UDORD0
uspi_bit	UartSpi_UDRE0
uspi_bit	UartSpi_RXC0

Detailed Description

API

void UartSpiInit(void);
void StartAdcConversion(void);

Definition in file UartSpi.h.

Function Documentation

CfgSpiToTransferMsbFirst()

void CfgSpiToTransferMsbFirst ( void  )

inline

Transfer MSB first

Definition at line 117 of file UartSpi.h.

GiveSpiControlOverMisoAndMosiPins()

void GiveSpiControlOverMisoAndMosiPins ( void  )

inline

Override normal port operation for SPI MOSI/MISO:

• enable the transmitter:
  • the UART Tx pin becomes the SPI MOSI
• enable the receiver:
  • the UART Rx pin becomes the SPI MISO

Definition at line 127 of file UartSpi.h.

RunSpiAt5Mhz()

void RunSpiAt5Mhz ( void  )

inline

Configure USART to clock ADC SCK at fosc/2 = 5MHz

• fosc = 10MHz (10MHz external oscillator)
• baudrate in bits per second = fosc/(2*(UBBR0+1))
• set UBBR0=0 for baudrate = fosc/2

Definition at line 37 of file UartSpi.h.

SetAdcConvAsOutput()

void SetAdcConvAsOutput ( void  )

inline

AdcConv is a general purpose i/o pin.

• configure as an output
• controls start of conversion
• controls start of readout

Definition at line 63 of file UartSpi.h.

SetSckAsOutput()

void SetSckAsOutput ( void  )

inline

Cfg XCK as an output. CPOL=1 makes the clock idle high.

Definition at line 50 of file UartSpi.h.

UartSpiInit()

void UartSpiInit ( void  )

inline

UartSpiInit behavior:

• clocks SPI bus at 5MHz
  
• sets Sck as an output
  
• sets AdcConv to idle low
  
• sets AdcConv as an output
  
• enables the UART in Master SPI Mode
  
• uses SPI data mode CPOL 1 CPHA 1
  
• cfgs SPI to transfer MSB first
  
• gives SPI control over Miso and Mosi pin behavior
  

Definition at line 164 of file UartSpi.h.

UseSpiDataModeCpol1CPha1()

void UseSpiDataModeCpol1CPha1 ( void  )

inline

Use SPI data mode: CPOL=1, CPHA=1

• clock idles high
• load data on falling clock edge
• sample data on rising clock edge

Definition at line 96 of file UartSpi.h.