SPI

Synchronous serial communication. More...

Files
file	MCP4921.h
	Synchronous serial communication.
file	SPI.h
	Synchronous serial communication.

Macros
#define	MCP4921_OutNonBlocking(code)   SPI0->TXDATA = code|(1<<12);
	Output data, nonblocking Send data to MCP4921 12-bit DAC without waiting for a response. This is useful in audio applications where DAC outputs are relatively infrequent and where the DAC response is meaningless. Since the state of the FIFO is not checked before sending, data may be lost. More...
#define	ECE445L_Lab6   0
#define	SPI1_SCLKINDEX   (PB9INDEX)
#define	SPI1_PICOINDEX   (PB8INDEX)
#define	SPI1_POCIINDEX   (PB7INDEX)
#define	SDC_CS   GPIOA
#define	SDC_CS_PIN   (1<<12)
#define	SDC_CS_INDEX   (PA12INDEX)
#define	SDC_CS_LOW()   (SDC_CS->DOUTCLR31_0 = SDC_CS_PIN)
#define	SDC_CS_HIGH()   (SDC_CS->DOUTSET31_0 = SDC_CS_PIN)
#define	TFT_CS   GPIOB
#define	TFT_CS_PIN   (1<<6)
#define	TFT_CS_INDEX   (PB6INDEX)
#define	TFT_CS_LOW()   (TFT_CS->DOUTCLR31_0 = TFT_CS_PIN)
#define	TFT_CS_HIGH()   (TFT_CS->DOUTSET31_0 = TFT_CS_PIN)
#define	TFT_DC   GPIOA
#define	TFT_DC_PIN   (1<<13)
#define	TFT_DC_INDEX   (PA13INDEX)
#define	TFT_DC_LOW()   (TFT_DC->DOUTCLR31_0 = TFT_DC_PIN)
#define	TFT_DC_HIGH()   (TFT_DC->DOUTSET31_0 = TFT_DC_PIN)
#define	TFT_RST   GPIOB
#define	TFT_RST_PIN   (1<<15)
#define	TFT_RST_INDEX   (PB15INDEX)
#define	TFT_RST_LOW()   (TFT_RST->DOUTCLR31_0 = TFT_RST_PIN)
#define	TFT_RST_HIGH()   (TFT_RST->DOUTSET31_0 = TFT_RST_PIN)

Functions
void	MCP4921_Init (uint32_t data)
	initialize MCP4921 More...
void	MCP4921_Out (uint32_t data)
	Output data. More...
void	SPI_OutData (char data)
	Output data. More...
void	SPI_OutCommand (char command)
	Output command. More...
void	SPI1_Reset (void)
	Reset LCD. More...
void	CS_Init (void)
void	SPI1_Init (void)
	initialize SPI1 More...
void	TFT_OutCommand (char command)
void	TFT_OutData (char data)
	Output data. More...

Detailed Description

Synchronous serial communication.

SPI-DAC pins

Pin	Function	Description
PB18	SPI0 SCLK	DAC SPI clock (SPI)
PA8	SPI0 CS	DAC SPI CS
PB17	SPI0 PICO	DAC SPI data (SPI)

SPI-LCD pins

Pin	Function	Description
PB9	SPI1 SCLK	LCD SPI clock (SPI)
PB6	GPIO CS	LCD SPI CS
PA12	GPIO CS	SDC SPI CS
PB8	SPI1 PICO	LCD SPI data (SPI)
PB7	SPI1 POCI	SCD SPI data (SPI)
PB15	GPIO	LCD !RST =1 for run, =0 for reset
PA13	GPIO	LCD D/C RS =1 for data, =0 for command

Macro Definition Documentation

MCP4921_OutNonBlocking

#define MCP4921_OutNonBlocking

(

code

)

SPI0->TXDATA = code|(1<<12);

Output data, nonblocking Send data to MCP4921 12-bit DAC without waiting for a response. This is useful in audio applications where DAC outputs are relatively infrequent and where the DAC response is meaningless. Since the state of the FIFO is not checked before sending, data may be lost.

Output 16-bit data to SPI port, nonblocking.

Parameters

code	is an 16-bit data to be transferred

Returns

none

Function Documentation

MCP4921_Init()

void MCP4921_Init

(

uint32_t

data

)

initialize MCP4921

Initialize MCP4921 using SPI0 for 8 MHz baud clock 16-bit data using busy-wait synchronization. Calls Clock_Freq to get bus clock

• PA8 SPI0_CS0
• PB18 SPI0_SCK
• PB17 SPI0_PICO

  Note

  SPI0,SPI1 in power domain PD1 SysClk equals bus CPU clock

  Parameters

  data	initial value to DAC

  Returns

  none

MCP4921_Out()

void MCP4921_Out

(

uint32_t

data

)

Output data.

Output 16-bit data to MCP4921 using SPI0.

Parameters

data	is an 16-bit data to be transferred

Returns

none

SPI1_Init()

void SPI1_Init

(

void

)

initialize SPI1

Initialize SPI1 for 8 MHz baud clock for both SDC and TFT using busy-wait synchronization. Calls Clock_Freq to get bus clock

• PB9 SPI1 SCLK
  
• PB6 SPI1 CS0
  
• PB8 SPI1 PICO
  
• PB15 GPIO !RST =1 for run, =0 for reset
  
• PA13 GPIO RS =1 for data, =0 for command

Note

SPI0,SPI1 in power domain PD1 SysClk equals bus CPU clock

Parameters

none

Returns

none

SPI1_Reset()

void SPI1_Reset

(

void

)

Reset LCD.

Reset LCD

1. drive RST high for 500ms
2. drive RST low for 500ms
3. drive RST high for 500ms

Parameters

none

Returns

none

SPI_OutCommand()

void SPI_OutCommand

(

char

command

)

Output command.

Output 8-bit command to SPI port. RS=PA13=0 for command

Parameters

command

is an 8-bit command to be transferred

Returns

none

SPI_OutData()

void SPI_OutData

(

char

data

)

Output data.

Output 8-bit data to SPI port. RS=PA13=1 for data.

Parameters

data	is an 8-bit data to be transferred

Returns

none

TFT_OutData()

void TFT_OutData

(

char

data

)

Output data.

Output 8-bit data to SPI port. RS=PB16=1 for data.

Parameters

data	is an 8-bit data to be transferred

Returns

none