217 lines
7.4 KiB
C
217 lines
7.4 KiB
C
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/*!
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* @defgroup SPI
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* @brief Synchronous serial communication
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<table>
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<caption id="AdafruitLCDpins8">Adafruit ST7735R pins </caption>
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<tr><th>Pin <th>Connection <th>Description
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<tr><td>10<td>+3.3<td>Backlight
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<tr><td>9 <td>PB7 <td>SPI1 MISO (used for SDC)
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<tr><td>8 <td>PB9 <td>SPI1 SCLK clock out
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<tr><td>7 <td>PB8 <td>SPI1 PICO data out
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<tr><td>6 <td>PB6 <td>GPIO CS0=TFT_CS
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<tr><td>5 <td>PB0 <td>CARD_CS (used for SDC)
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<tr><td>4 <td>PB16<td>Data/Command(GPIO), high for data, low for command
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<tr><td>3 <td>PB15<td>RESET, low to reset, (GPIO)
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<tr><td>2 <td>+3.3<td>VCC
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<tr><td>1 <td>Gnd <td>ground
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</table>
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<table>
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<caption id="HiLetgopins8">HiLetgo ST7735 TFT and SDC pins </caption>
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<tr><th>signal<th>Pin<th>Connection
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<tr><td>LED- <td>16<td>TFT, to ground
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<tr><td>LED+ <td>15<td>TFT, to +3.3 V
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<tr><td>SD_CS <td>14<td>SDC, to PB0 chip select
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<tr><td>MOSI <td>13<td>SDC, to PB8 MOSI
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<tr><td>MISO <td>12<td>SDC, to PB7 MISO
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<tr><td>SCK <td>11<td>SDC, to PB9 serial clock
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<tr><td>CS <td>10<td>TFT, to PB6 SPI1 CS0
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<tr><td>SCL <td> 9<td>TFT, to PB9 SPI1 SCLK
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<tr><td>SDA <td> 8<td>TFT, to PB8 MOSI SPI1 PICO
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<tr><td>A0 <td> 7<td>TFT, to PB16 Data/Command, high for data, low for command
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<tr><td>RESET <td> 6<td>TFT, to PB15 reset (GPIO), low to reset
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<tr><td>NC <td>3,4,5<td>not connected
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<tr><td>VCC <td> 2<td>to +3.3 V
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<tr><td>GND <td> 1<td>to ground
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</table>
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* @{*/
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/**
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* @file SPI.h
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* @brief 160 by 128 pixel LCD
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* @details Software driver functions for ST7735R display<br>
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* This is a library for the Adafruit 1.8" SPI display.<br>
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* This library works with the Adafruit 1.8" TFT Breakout w/SD card<br>
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* ----> http://www.adafruit.com/products/358<br>
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* as well as Adafruit raw 1.8" TFT display<br>
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* ----> http://www.adafruit.com/products/618<br>
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* Check out the links above for our tutorials and wiring diagrams<br>
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* These displays use SPI to communicate, 4 or 5 pins are required to
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* interface (RST is optional)
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* Adafruit invests time and resources providing this open source code,
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* please support Adafruit and open-source hardware by purchasing
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* products from Adafruit!
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* Written by Limor Fried/Ladyada for Adafruit Industries.
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* MIT license, all text above must be included in any redistribution
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* @version ECE445M RTOS
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* @author Daniel Valvano and Jonathan Valvano
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* @copyright Copyright 2025 by Jonathan W. Valvano, valvano@mail.utexas.edu,
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* @warning AS-IS
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* @note For more information see http://users.ece.utexas.edu/~valvano/
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* @date December 27, 2025
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* interface <br>
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* \image html ST7735interface.png width=500px
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* <br><br>ST7735 160 by 128 pixel LCD<br>
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* \image html ST7735.png width=500px
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<table>
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<caption id="AdafruitLCDpins2">Adafruit ST7735R pins </caption>
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<tr><th>Pin <th>Connection <th>Description
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<tr><td>10<td>+3.3<td>Backlight
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<tr><td>9 <td>PB7 <td>SPI1 MISO (used for SDC)
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<tr><td>8 <td>PB9 <td>SPI1 SCLK clock out
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<tr><td>7 <td>PB8 <td>SPI1 PICO data out
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<tr><td>6 <td>PB6 <td>GPIO CS0=TFT_CS
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<tr><td>5 <td>PB0 <td>CARD_CS (used for SDC)
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<tr><td>4 <td>PB16<td>Data/Command(GPIO), high for data, low for command
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<tr><td>3 <td>PB15<td>RESET, low to reset, (GPIO)
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<tr><td>2 <td>+3.3<td>VCC
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<tr><td>1 <td>Gnd <td>ground
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</table>
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<table>
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<caption id="HiLetgopins2">HiLetgo ST7735 TFT and SDC pins </caption>
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<tr><th>signal<th>Pin<th>Connection
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<tr><td>LED- <td>16<td>TFT, to ground
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<tr><td>LED+ <td>15<td>TFT, to +3.3 V
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<tr><td>SD_CS <td>14<td>SDC, to PB0 chip select
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<tr><td>MOSI <td>13<td>SDC, to PB8 MOSI
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<tr><td>MISO <td>12<td>SDC, to PB7 MISO
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<tr><td>SCK <td>11<td>SDC, to PB9 serial clock
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<tr><td>CS <td>10<td>TFT, to PB6 SPI1 CS0
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<tr><td>SCL <td> 9<td>TFT, to PB9 SPI1 SCLK
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<tr><td>SDA <td> 8<td>TFT, to PB8 MOSI SPI1 PICO
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<tr><td>A0 <td> 7<td>TFT, to PB16 Data/Command, high for data, low for command
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<tr><td>RESET <td> 6<td>TFT, to PB15 reset (GPIO), low to reset
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<tr><td>NC <td>3,4,5<td>not connected
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<tr><td>VCC <td> 2<td>to +3.3 V
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<tr><td>GND <td> 1<td>to ground
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</table>
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<br>
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******************************************************************************/
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#ifndef __SPI_H__
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#define __SPI_H__
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// PB0 output used for SDC CS
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#define SDC_CS GPIOB
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#define SDC_CS_PIN (1<<0) // CS controlled by software
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#define SDC_CS_INDEX (PB0INDEX) // PB0 GPIO
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#define SDC_CS_LOW() (SDC_CS->DOUTCLR31_0 = SDC_CS_PIN) // PB0 low
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#define SDC_CS_HIGH() (SDC_CS->DOUTSET31_0 = SDC_CS_PIN) // PB0 high
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// PB6 output used for SDC CS
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//#define TFT_CS_LOW() (GPIOB->DOUTCLR31_0 = (1<<6)) // PB6 low
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//#define TFT_CS_HIGH() (GPIOB->DOUTSET31_0 = (1<<6)) // PB6 high
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#define TFT_CS GPIOB
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#define TFT_CS_PIN (1<<6) // TFT CS controlled by software
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#define TFT_CS_INDEX (PB6INDEX) // PB6 GPIO
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#define TFT_CS_LOW() (TFT_CS->DOUTCLR31_0 = TFT_CS_PIN) // PB6 low
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#define TFT_CS_HIGH() (TFT_CS->DOUTSET31_0 = TFT_CS_PIN) // PB6 high
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#define TFT_DC GPIOB
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#define TFT_DC_PIN (1<<16) // D/C controlled by software
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#define TFT_DC_INDEX (PB16INDEX) // PB16 GPIO
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#define TFT_DC_LOW() (TFT_DC->DOUTCLR31_0 = TFT_DC_PIN) // PB16 low
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#define TFT_DC_HIGH() (TFT_DC->DOUTSET31_0 = TFT_DC_PIN) // PB16 high
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#define TFT_RST GPIOB
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#define TFT_RST_PIN (1<<15) // !RST controlled by software
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#define TFT_RST_INDEX (PB15INDEX) // PB15 GPIO
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#define TFT_RST_LOW() (TFT_RST->DOUTCLR31_0 = TFT_RST_PIN) // PB15 low
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#define TFT_RST_HIGH() (TFT_RST->DOUTSET31_0 = TFT_RST_PIN) // PB15 high
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/**
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* Output 8-bit data to SPI port.
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* RS=PA13=1 for data.
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* @param data is an 8-bit data to be transferred
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* @return none
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* @brief Output data
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*/
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void SPI_OutData(char data);
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/**
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* Output 8-bit command to SPI port.
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* RS=PA13=0 for command
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* @param command is an 8-bit command to be transferred
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* @return none
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* @brief Output command
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*/
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void SPI_OutCommand(char command);
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/**
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* Reset LCD
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* -# drive RST high for 500ms
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* -# drive RST low for 500ms
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* -# drive RST high for 500ms
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*
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* @param none
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* @return none
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* @brief Reset LCD
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*/
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void SPI1_Reset(void);
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/**
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* SDC CS initialization
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* -PB0 GPIO output
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* -drive low to enable SDC
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* -drive high to disable SDC
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*
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* @param none
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* @return none
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* @brief SDC CS initialization
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*/
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void CS_Init(void);
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/**
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* Initialize SPI1 for 8 MHz baud clock
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* for both SDC and TFT
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* using busy-wait synchronization.
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* Calls Clock_Freq to get bus clock
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* - PB9 SPI1 SCLK
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* - PB6 SPI1 CS0
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* - PB8 SPI1 PICO
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* - PB15 GPIO !RST =1 for run, =0 for reset
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* - PB16 GPIO RS =1 for data, =0 for command
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*
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* @note SPI0,SPI1 in power domain PD1 SysClk equals bus CPU clock
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* @param none
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* @return none
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* @brief initialize SPI1
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*/
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void SPI1_Init(void);
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/**
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* Output 8-bit command to SPI port.
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* RS=PB16=0 for command.
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* @param data is an 8-bit command to be transferred
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* @return none
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* @brief Output command
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*/
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void TFT_OutCommand(char command);
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/**
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* Output 8-bit data to SPI port.
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* RS=PB16=1 for data.
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* @param data is an 8-bit data to be transferred
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* @return none
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* @brief Output data
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*/
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void TFT_OutData(char data);
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#endif // __SPI_H__
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/** @}*/
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