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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.io/license.html
*/
#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H
#include "board_uext.h"
/*
* NOTE: This board file is for an SSD1306 running in SPI mode
* You will need to use a different board file for an SSD1306 running in I2C mode
*/
// The various methods of driving the SPI interface
#define SPI_METHOD_PIO 1
#define SPI_METHOD_AT91 2
#define SPI_METHOD_CHIBIOS 3 // ChibiOS SPI for AT91SAM7 requires patch 7675 or higher to work correctly
// The various methods of driving the PIO interface
#define PIO_METHOD_AT91 1
#define PIO_METHOD_CHIBIOS 2 // ChibiOS PIO for the AT91SAM7 requires patch 7669 or higher to work correctly
// What methods are we using in this file
#define SPI_METHOD SPI_METHOD_AT91
#define PIO_METHOD PIO_METHOD_AT91
// If using SPI_METHOD_CHIBIOS or SPI_METHOD_AT91 then this must be defined for your CPU
#define SPI_CONFIG_REGISTER 0x00000801 // For AT91SAM7: 8bit, CPOL=1, NCPHA = 0, ClockPhase=0, SCLK = 48Mhz/8 = 6MHz
//---------------------------------------------------------------------
/*
* Pin connection for the display to the UEXT connector:
*
* DISPLAY VCC UEXT PIN 1 (3.3V)
* DISPLAY GND UEXT PIN 2 (GND)
* DISPLAY SCL UEXT PIN 9 (SCK)
* DISPLAY SDA UEXT PIN 8 (MOSI)
* DISPLAY RST UEXT PIN 5 (SCL)
* DISPLAY D/C UEXT PIN 6 (SDA)
*/
#define PORT_RESET UEXT_PORT_PIN5
#define PIN_RESET UEXT_PORTPIN_PIN5
#define PORT_DC UEXT_PORT_PIN6
#define PIN_DC UEXT_PORTPIN_PIN6
#if PIO_METHOD == PIO_METHOD_AT91
#define PinIsOutput(port,pin) ((port)->PIO_OER = 1 << (pin), (port)->PIO_PER = 1 << (pin), (port)->PIO_MDDR = 1 << (pin), (port)->PIO_PPUDR = 1 << (pin))
#define PinSet(port,pin) (port)->PIO_SODR = 1 << (pin)
#define PinClear(port,pin) (port)->PIO_CODR = 1 << (pin)
#elif PIO_METHOD == PIO_METHOD_CHIBIOS
#define PinIsOutput(port,pin) palSetPadMode((port), (pin), PAL_MODE_OUTPUT_PUSHPULL)
#define PinSet(port,pin) palSetPad((port), (pin))
#define PinClear(port,pin) palClearPad((port), (pin))
#else
#error "SSD1306 board file: Unsupported PIO method"
#endif
#if SPI_METHOD == SPI_METHOD_PIO
static void spi_delay(volatile unsigned long a) { while (a!=0) a--; }
static void spi_write(uint8_t data) {
uint8_t bit;
for(bit = 0x80; bit; bit >>= 1) {
if(data & bit)
PinSet(UEXT_SPI_MOSI_PORT, UEXT_SPI_MOSI_PORTPIN);
else
PinClear(UEXT_SPI_MOSI_PORT, UEXT_SPI_MOSI_PORTPIN);
spi_delay(1);
PinClear(UEXT_SPI_SCK_PORT, UEXT_SPI_SCK_PORTPIN);
spi_delay(1);
PinSet(UEXT_SPI_SCK_PORT, UEXT_SPI_SCK_PORTPIN);
}
}
#define SPI_INIT() { \
PinIsOutput (UEXT_SPI_MOSI_PORT, UEXT_SPI_MOSI_PORTPIN); \
PinSet (UEXT_SPI_MOSI_PORT, UEXT_SPI_MOSI_PORTPIN); \
PinIsOutput (UEXT_SPI_SCK_PORT, UEXT_SPI_SCK_PORTPIN); \
PinSet (UEXT_SPI_SCK_PORT, UEXT_SPI_SCK_PORTPIN); \
PinIsOutput (UEXT_SPI_CS_PORT, UEXT_SPI_CS_PORTPIN); \
PinSet (UEXT_SPI_CS_PORT, UEXT_SPI_CS_PORTPIN); \
}
#define SPI_GETBUS() PinClear(UEXT_SPI_CS_PORT, UEXT_SPI_CS_PORTPIN)
#define SPI_RELEASEBUS() PinSet(UEXT_SPI_CS_PORT, UEXT_SPI_CS_PORTPIN)
#define SPI_WAITCOMPLETE()
#define SPI_WRITEBYTE(data) spi_write(data)
#define SPI_WRITEBYTES(pdata, len) while(len--) spi_write(*pdata++)
#elif SPI_METHOD == SPI_METHOD_AT91
#if UEXT_SPI_SCK_PORTPIN == 22
// Assume it is on SPI1
#define UEXT_SPI_DEV AT91C_BASE_SPI1
#define UEXT_SPI_ID AT91C_ID_SPI1
#define UEXT_SPI_PORT AT91C_BASE_PIOA
#define UEXT_SPI_PERIPH PIO_BSR
#else
// Assume it is on SPI0
#define UEXT_SPI_DEV AT91C_BASE_SPI0
#define UEXT_SPI_ID AT91C_ID_SPI0
#define UEXT_SPI_PORT AT91C_BASE_PIOA
#define UEXT_SPI_PERIPH PIO_ASR
#endif
#define SPI_INIT() { \
UEXT_SPI_PORT->PIO_MDDR = (1<<UEXT_SPI_CS_PORTPIN) | (1<<UEXT_SPI_SCK_PORTPIN) | (1<<UEXT_SPI_MOSI_PORTPIN) | (1<<UEXT_SPI_MISO_PORTPIN); \
UEXT_SPI_PORT->PIO_PPUER = 1<<UEXT_SPI_MISO_PORTPIN; \
UEXT_SPI_PORT->PIO_PDR = (1<<UEXT_SPI_CS_PORTPIN) | (1<<UEXT_SPI_SCK_PORTPIN) | (1<<UEXT_SPI_MOSI_PORTPIN) | (1<<UEXT_SPI_MISO_PORTPIN); \
UEXT_SPI_PORT->UEXT_SPI_PERIPH = (1<<UEXT_SPI_CS_PORTPIN) | (1<<UEXT_SPI_SCK_PORTPIN) | (1<<UEXT_SPI_MOSI_PORTPIN) | (1<<UEXT_SPI_MISO_PORTPIN); \
AT91C_BASE_PMC->PMC_PCER = 1 << UEXT_SPI_ID; \
UEXT_SPI_DEV->SPI_CR = 0x81; \
UEXT_SPI_DEV->SPI_CR = 0x81; \
UEXT_SPI_DEV->SPI_CR = 0x01; \
UEXT_SPI_DEV->SPI_MR = 0x000E0011; \
UEXT_SPI_DEV->SPI_CSR[0] = SPI_CONFIG_REGISTER; \
}
#define SPI_WAITCOMPLETE() while(!(UEXT_SPI_DEV->SPI_SR & AT91C_SPI_TXEMPTY))
#define SPI_GETBUS()
#define SPI_RELEASEBUS()
#define SPI_WRITEBYTE(data) { \
while(!(UEXT_SPI_DEV->SPI_SR & AT91C_SPI_TDRE)); \
UEXT_SPI_DEV->SPI_TDR = data; \
}
#define SPI_WRITEBYTES(pdata, len) while(len--) SPI_WRITEBYTE(*pdata++)
#elif SPI_METHOD == SPI_METHOD_CHIBIOS
static const SPIConfig spiconfig = {
0,
/* HW dependent part.*/
UEXT_SPI_CS_PORT,
UEXT_SPI_CS_PORTPIN,
SPI_CONFIG_REGISTER
};
#define SPI_INIT()
#define SPI_GETBUS() { \
spiStart(UEXT_SPI, &spiconfig); \
spiSelect(UEXT_SPI); \
}
#define SPI_RELEASEBUS() { \
spiUnselect(UEXT_SPI); \
spiStop(UEXT_SPI); \
}
#define SPI_WAITCOMPLETE()
#define SPI_WRITEBYTE(data) spiSend(UEXT_SPI, 1, &data)
#define SPI_WRITEBYTES(pdata, len) spiSend(UEXT_SPI, len, pdata)
#else
#error "SSD1306 board file: Unsupported SPI method"
#endif
static GFXINLINE void init_board(GDisplay *g) {
(void) g;
PinIsOutput (PORT_DC, PIN_DC);
PinIsOutput (PORT_RESET, PIN_RESET);
PinSet (PORT_RESET, PIN_RESET);
SPI_INIT();
}
static GFXINLINE void post_init_board(GDisplay *g) {
(void) g;
}
static GFXINLINE void setpin_reset(GDisplay *g, gBool state) {
(void) g;
(void) state;
if (state)
PinClear(PORT_RESET, PIN_RESET);
else
PinSet(PORT_RESET, PIN_RESET);
}
static GFXINLINE void set_backlight(GDisplay *g, uint8_t percent) {
(void) g;
(void) percent;
}
static GFXINLINE void acquire_bus(GDisplay *g) {
(void) g;
SPI_GETBUS();
}
static GFXINLINE void release_bus(GDisplay *g) {
(void) g;
SPI_WAITCOMPLETE();
SPI_RELEASEBUS();
}
static GFXINLINE void write_cmd(GDisplay *g, uint8_t cmd) {
(void) g;
// Command mode please
SPI_WAITCOMPLETE();
PinClear(PORT_DC, PIN_DC);
SPI_WRITEBYTE(cmd);
}
static GFXINLINE void write_data(GDisplay *g, uint8_t* data, uint16_t length) {
(void) g;
// Data mode please
SPI_WAITCOMPLETE();
PinSet(PORT_DC, PIN_DC);
SPI_WRITEBYTES(data, length);
}
#endif /* _GDISP_LLD_BOARD_H */
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