////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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// Filename: helloworld.c
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// Filename: helloworld.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 very simple program. This program tests the LEDs, buttons,
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// Purpose: A very simple program. This program tests the LEDs, buttons,
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// and UART. Specifically, if run, this program will cycle through
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// and UART. Specifically, if run, this program will cycle through
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// the LEDs at one change per second. If one button is pressed, it will
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// the LEDs at one change per second. If one button is pressed, it will
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// cycle through turning one LED off once per second while turning the
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// cycle through turning one LED off once per second while turning the
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// rest on. If the other button is pressed, two LED's will never turn on.
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// rest on. If the other button is pressed, two LED's will never turn on.
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//
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//
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// To test the UART, the message "Hello, world!" will be sent to the UART
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// To test the UART, the message "Hello, world!" will be sent to the UART
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// at the top of each second.
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// at the top of each second.
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//
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//
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// This program is simple. Although it uses the interrupt controller,
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// This program is simple. Although it uses the interrupt controller,
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// interrupts are disabled throughout the program. The interrupt
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// interrupts are disabled throughout the program. The interrupt
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// controller is only used to determine when events have taken place.
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// controller is only used to determine when events have taken place.
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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 "asmstartup.h"
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#include "asmstartup.h"
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#include "board.h"
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#include "board.h"
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const char msg[] = "Hello, world!\r\n";
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const char msg[] = "Hello, world!\r\n";
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void entry(void) {
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void entry(void) {
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register IOSPACE *sys = (IOSPACE *)IOADDR;
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volatile IOSPACE *const sys = (IOSPACE *)IOADDR;
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int ledset = 0;
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int ledset = 0;
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sys->io_spio = 0x0f0;
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sys->io_spio = 0x0f0;
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/// Turn off timer B
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/// Turn off timer B
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sys->io_timb = 0;
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sys->io_watchdog = 0;
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while(1) {
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while(1) {
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const char *ptr;
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const char *ptr;
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sys->io_tima = TM_ONE_SECOND; // Ticks per second, 80M
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sys->io_timer = TM_ONE_SECOND; // Ticks per second, 80M
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sys->io_pic = 0x07fffffff; // Acknowledge and turn off all ints
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sys->io_pic = 0x07fffffff; // Acknowledge and turn off all ints
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ptr = msg;
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ptr = msg;
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while(*ptr) {
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while(*ptr) {
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unsigned iv = *(unsigned char *)ptr++;
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// Wait while our transmitter is busy
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// Wait while our transmitter is busy
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while((sys->io_pic & INT_UARTTX)==0)
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while((sys->io_pic & INT_UARTTX)==0)
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;
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;
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sys->io_uart = *ptr++; // Transmit our character
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sys->io_uart = iv; // Transmit our character
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sys->io_pic = INT_UARTTX; // Clear the int flag
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sys->io_pic = INT_UARTTX; // Clear the int flag
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}
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}
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// Now, wait for the top of the second
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// Now, wait for the top of the second
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while((sys->io_pic & INT_TIMA)==0)
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while((sys->io_pic & INT_TIMER)==0)
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;
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;
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ledset <<= 1;
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ledset <<= 1;
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ledset &= 15;
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ledset &= 15;
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if (ledset == 0)
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if (ledset == 0)
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ledset = 1;
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ledset = 1;
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ledset |= 0xf0;
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ledset |= 0xf0;
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int btn = sys->io_spio;
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int btn = sys->io_spio;
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if (btn&0x10)
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if (btn&0x10)
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sys->io_spio = ledset^0x0f;
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sys->io_spio = ledset^0x0f;
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else if (btn&0x20)
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else if (btn&0x20)
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sys->io_spio = ledset&0x0f5;
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sys->io_spio = ledset&0x0f5;
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else
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else
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sys->io_spio = ledset;
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sys->io_spio = ledset;
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}
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}
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}
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}
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