////////////////////////////////////////////////////////////////////////////////
|
////////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
// Filename: helloworld.c
|
// Filename: helloworld.c
|
//
|
//
|
// Project: CMod S6 System on a Chip, ZipCPU demonstration project
|
// Project: CMod S6 System on a Chip, ZipCPU demonstration project
|
//
|
//
|
// Purpose: A very simple program. This program tests the LEDs, buttons,
|
// Purpose: A very simple program. This program tests the LEDs, buttons,
|
// and UART. Specifically, if run, this program will cycle through
|
// and UART. Specifically, if run, this program will cycle through
|
// the LEDs at one change per second. If one button is pressed, it will
|
// the LEDs at one change per second. If one button is pressed, it will
|
// cycle through turning one LED off once per second while turning the
|
// cycle through turning one LED off once per second while turning the
|
// rest on. If the other button is pressed, two LED's will never turn on.
|
// rest on. If the other button is pressed, two LED's will never turn on.
|
//
|
//
|
// To test the UART, the message "Hello, world!" will be sent to the UART
|
// To test the UART, the message "Hello, world!" will be sent to the UART
|
// at the top of each second.
|
// at the top of each second.
|
//
|
//
|
// This program is simple. Although it uses the interrupt controller,
|
// This program is simple. Although it uses the interrupt controller,
|
// interrupts are disabled throughout the program. The interrupt
|
// interrupts are disabled throughout the program. The interrupt
|
// controller is only used to determine when events have taken place.
|
// controller is only used to determine when events have taken place.
|
//
|
//
|
// Creator: Dan Gisselquist, Ph.D.
|
// Creator: Dan Gisselquist, Ph.D.
|
// Gisselquist Technology, LLC
|
// Gisselquist Technology, LLC
|
//
|
//
|
////////////////////////////////////////////////////////////////////////////////
|
////////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
|
// Copyright (C) 2015-2017, Gisselquist Technology, LLC
|
//
|
//
|
// This program is free software (firmware): you can redistribute it and/or
|
// This program is free software (firmware): you can redistribute it and/or
|
// modify it under the terms of the GNU General Public License as published
|
// modify it under the terms of the GNU General Public License as published
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
// by the Free Software Foundation, either version 3 of the License, or (at
|
// your option) any later version.
|
// your option) any later version.
|
//
|
//
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// for more details.
|
// for more details.
|
//
|
//
|
// You should have received a copy of the GNU General Public License along
|
// You should have received a copy of the GNU General Public License along
|
// with this program. (It's in the $(ROOT)/doc directory, run make with no
|
// with this program. (It's in the $(ROOT)/doc directory, run make with no
|
// target there if the PDF file isn't present.) If not, see
|
// target there if the PDF file isn't present.) If not, see
|
// <http://www.gnu.org/licenses/> for a copy.
|
// <http://www.gnu.org/licenses/> for a copy.
|
//
|
//
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
// License: GPL, v3, as defined and found on www.gnu.org,
|
// http://www.gnu.org/licenses/gpl.html
|
// http://www.gnu.org/licenses/gpl.html
|
//
|
//
|
//
|
//
|
////////////////////////////////////////////////////////////////////////////////
|
////////////////////////////////////////////////////////////////////////////////
|
//
|
//
|
//
|
//
|
#include "asmstartup.h"
|
#include "asmstartup.h"
|
#include "board.h"
|
#include "board.h"
|
|
|
const char msg[] = "Hello, world!\r\n";
|
const char msg[] = "Hello, world!\r\n";
|
|
|
void entry(void) {
|
void entry(void) {
|
register IOSPACE *sys = (IOSPACE *)IOADDR;
|
volatile IOSPACE *const sys = (IOSPACE *)IOADDR;
|
int ledset = 0;
|
int ledset = 0;
|
|
|
sys->io_spio = 0x0f0;
|
sys->io_spio = 0x0f0;
|
|
|
/// Turn off timer B
|
/// Turn off timer B
|
sys->io_timb = 0;
|
sys->io_watchdog = 0;
|
|
|
while(1) {
|
while(1) {
|
const char *ptr;
|
const char *ptr;
|
sys->io_tima = TM_ONE_SECOND; // Ticks per second, 80M
|
sys->io_timer = TM_ONE_SECOND; // Ticks per second, 80M
|
sys->io_pic = 0x07fffffff; // Acknowledge and turn off all ints
|
sys->io_pic = 0x07fffffff; // Acknowledge and turn off all ints
|
|
|
ptr = msg;
|
ptr = msg;
|
while(*ptr) {
|
while(*ptr) {
|
|
unsigned iv = *(unsigned char *)ptr++;
|
|
|
// Wait while our transmitter is busy
|
// Wait while our transmitter is busy
|
while((sys->io_pic & INT_UARTTX)==0)
|
while((sys->io_pic & INT_UARTTX)==0)
|
;
|
;
|
sys->io_uart = *ptr++; // Transmit our character
|
sys->io_uart = iv; // Transmit our character
|
sys->io_pic = INT_UARTTX; // Clear the int flag
|
sys->io_pic = INT_UARTTX; // Clear the int flag
|
}
|
}
|
|
|
// Now, wait for the top of the second
|
// Now, wait for the top of the second
|
while((sys->io_pic & INT_TIMA)==0)
|
while((sys->io_pic & INT_TIMER)==0)
|
;
|
;
|
|
|
ledset <<= 1;
|
ledset <<= 1;
|
ledset &= 15;
|
ledset &= 15;
|
if (ledset == 0)
|
if (ledset == 0)
|
ledset = 1;
|
ledset = 1;
|
ledset |= 0xf0;
|
ledset |= 0xf0;
|
|
|
int btn = sys->io_spio;
|
int btn = sys->io_spio;
|
if (btn&0x10)
|
if (btn&0x10)
|
sys->io_spio = ledset^0x0f;
|
sys->io_spio = ledset^0x0f;
|
else if (btn&0x20)
|
else if (btn&0x20)
|
sys->io_spio = ledset&0x0f5;
|
sys->io_spio = ledset&0x0f5;
|
else
|
else
|
sys->io_spio = ledset;
|
sys->io_spio = ledset;
|
}
|
}
|
}
|
}
|
|
|
|
|