////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Filename: display.c
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// Filename: display.c
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//
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//
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// Project: CMod S6 System on a Chip, ZipCPU demonstration project
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// Project: CMod S6 System on a Chip, ZipCPU demonstration project
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//
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//
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// Purpose: A device driver for the SPI controlled display. The primary
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// Purpose: A device driver for the SPI controlled display. The primary
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// purpose of this "device" is to output SPI instructions, though,
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// purpose of this "device" is to output SPI instructions, though,
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// not to handle screen position or to optimize data set to the display.
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// not to handle screen position or to optimize data set to the display.
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//
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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// Gisselquist Technology, LLC
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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// Copyright (C) 2015-2017, Gisselquist Technology, LLC
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//
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//
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// This program is free software (firmware): you can redistribute it and/or
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as published
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// modify it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// by the Free Software Foundation, either version 3 of the License, or (at
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// your option) any later version.
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// your option) any later version.
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//
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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// for more details.
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//
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//
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// You should have received a copy of the GNU General Public License along
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// You should have received a copy of the GNU General Public License along
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// with this program. (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.) If not, see
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// target there if the PDF file isn't present.) If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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// <http://www.gnu.org/licenses/> for a copy.
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//
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//
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// License: GPL, v3, as defined and found on www.gnu.org,
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// License: GPL, v3, as defined and found on www.gnu.org,
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// http://www.gnu.org/licenses/gpl.html
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// http://www.gnu.org/licenses/gpl.html
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//
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//
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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//
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//
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#include "board.h"
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#include "board.h"
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#include "display.h"
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#include "display.h"
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static void dispwait(void) {
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static void dispwait(void) {
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// Slow us down to the speed the display can handle
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// Slow us down to the speed the display can handle
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// We want to delay about 0x800 clocks.
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// We want to delay about 0x800 clocks.
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// Three instructions per loop,
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// Three instructions per loop,
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// LBL:
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// LBL:
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// NOOP
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// NOOP
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// ADD -1,CTR
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// ADD -1,CTR
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// BNZ LBL
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// BNZ LBL
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// 40 clocks per instruction, as required by the SPI flash memory
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// 40 clocks per instruction, as required by the SPI flash memory
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int i = 18;
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int i = 18;
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do {
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do {
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asm("noop");
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asm("noop");
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} while(i-->0);
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} while(i-->0);
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}
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}
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void dispchar(int ch) {
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void dispchar(char ch) {
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if (!ch) // Don't display null characters
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if (!ch) // Don't display null characters
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return;
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return;
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if (ch&(~0x0ff)) { // Multiple characters to display
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int ich = ch;
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int v = (ch>>24)&0x0ff;
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if (v) {
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dispchar(v);
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v = (ch>>16)&0x0ff;
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if (v) {
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dispchar(v);
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v = (ch>> 8)&0x0ff;
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if (v) {
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dispchar(v);
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dispchar(ch&0x0ff);
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}
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}
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}
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} else {
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IOSPACE *sys = (IOSPACE *)IOADDR;
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// Send the character
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// Send the character
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for(int i=0; i<8; i++) {
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for(int i=0; i<8; i++) {
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int gpiov = GPOCLRV(GPO_MOSI|GPO_SCK|GPO_SS);
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int gpiov = GPOCLRV(GPO_MOSI|GPO_SCK|GPO_SS);
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if (ch&0x80)
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if (ich&0x80)
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gpiov |= GPOSETV(GPO_MOSI);
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gpiov |= GPOSETV(GPO_MOSI);
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sys->io_gpio = gpiov;
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_sys->io_gpio = gpiov;
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dispwait();
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dispwait();
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sys->io_gpio = GPOSETV(GPO_SCK);
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_sys->io_gpio = GPOSETV(GPO_SCK);
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dispwait();
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dispwait();
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ch<<=1;
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ich<<=1;
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}
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}
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// Turn off the clock
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// Turn off the clock
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sys->io_gpio = GPOCLRV(GPO_SCK);
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_sys->io_gpio = GPOCLRV(GPO_SCK);
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dispwait();
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dispwait();
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// Then the port
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// Then the port
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sys->io_gpio = GPOSETV(GPO_SS);
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_sys->io_gpio = GPOSETV(GPO_SS);
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dispwait();
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dispwait();
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}
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}
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}
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#ifdef ZIPOS
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#ifdef ZIPOS
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#include "../zipos/ktraps.h"
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#include "../zipos/ktraps.h"
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#include "../zipos/kfildes.h"
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#include "../zipos/kfildes.h"
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void display_task(void) {
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void display_task(void) {
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while(1) {
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while(1) {
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int ch;
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char ch;
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read(FILENO_STDIN, &ch, 1);
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read(FILENO_STDIN, &ch, 1);
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dispchar(ch);
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dispchar(ch);
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}
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}
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}
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}
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#endif
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#endif
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