SPI

Synchronous serial communication. More...

Files
file	SPI.h
	160 by 128 pixel LCD
file	SPI1.h
	Synchronous serial communication.

Macros
#define	SDC_CS   GPIOB
#define	SDC_CS_PIN   (1<<0)
#define	SDC_CS_INDEX   (PB0INDEX)
#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   GPIOB
#define	TFT_DC_PIN   (1<<16)
#define	TFT_DC_INDEX   (PB16INDEX)
#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)
#define	SDC_CS   GPIOB
#define	SDC_CS_PIN   (1<<0)
#define	SDC_CS_INDEX   (PB0INDEX)
#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   GPIOB
#define	TFT_DC_PIN   (1<<16)
#define	TFT_DC_INDEX   (PB16INDEX)
#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	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)
	SDC CS initialization. More...
void	SPI1_Init (void)
	initialize SPI1 More...
void	TFT_OutCommand (char command)
	Output command. More...
void	TFT_OutData (char data)
	Output data. More...

Detailed Description

Synchronous serial communication.

Adafruit ST7735R pins

Pin	Connection	Description
10	+3.3	Backlight
9	PB7	SPI1 MISO (used for SDC)
8	PB9	SPI1 SCLK clock out
7	PB8	SPI1 PICO data out
6	PB6	GPIO CS0=TFT_CS
5	PB0	CARD_CS (used for SDC)
4	PB16	Data/Command(GPIO), high for data, low for command
3	PB15	RESET, low to reset, (GPIO)
2	+3.3	VCC
1	Gnd	ground

HiLetgo ST7735 TFT and SDC pins

signal	Pin	Connection
LED-	16	TFT, to ground
LED+	15	TFT, to +3.3 V
SD_CS	14	SDC, to PB0 chip select
MOSI	13	SDC, to PB8 MOSI
MISO	12	SDC, to PB7 MISO
SCK	11	SDC, to PB9 serial clock
CS	10	TFT, to PB6 SPI1 CS0
SCL	9	TFT, to PB9 SPI1 SCLK
SDA	8	TFT, to PB8 MOSI SPI1 PICO
A0	7	TFT, to PB16 Data/Command, high for data, low for command
RESET	6	TFT, to PB15 reset (GPIO), low to reset
NC	3,4,5	not connected
VCC	2	to +3.3 V
GND	1	to ground

SPI-LCD pins

Pin	Function	Description
PB9	SPI1 SCLK <tdLCD SPI clock (SPI)
PB6	GPIO CS	LCD SPI CS
PB0	GPIO CS	SDC SPI CS
PB8	SPI1 PICO	LCD SPI data (SPI)
PB7	SPI1 POCI	SCD SPI data (SPI)
PB15	GPIO	J2.17 LCD !RST =1 for run, =0 for reset
PB16	GPIO	J4.31 LCD D/C RS =1 for data, =0 for command

Function Documentation

CS_Init()

void CS_Init

(

void

)

SDC CS initialization.

SDC CS initialization -PB0 GPIO output -drive low to enable SDC -drive high to disable SDC

Parameters

none

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
  
• PB16 GPIO RS =1 for data, =0 for command

Note

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

Parameters

none

Returns

none

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_OutCommand()

void TFT_OutCommand

(

char

command

)

Output command.

Output 8-bit command to SPI port. RS=PB16=0 for command.

Parameters

data	is an 8-bit command 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