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dgisselq |
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename: blinky.c
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//
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// Project: CMod S6 System on a Chip, ZipCPU demonstration project
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//
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// Purpose: To toggle/blink the LEDs in a fashion that will let us know
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// 1) that the CPU is running, 2) that the LEDs are working, and
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// even better, 3) that the buttons are working.
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//
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//
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// Creator: Dan Gisselquist, Ph.D.
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// Gisselquist Technology, LLC
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015-2017, Gisselquist Technology, LLC
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//
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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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// 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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//
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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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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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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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// 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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// <http://www.gnu.org/licenses/> for a copy.
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//
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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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//
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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 "board.h"
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void zip_idle(void);
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asm("\t.section\t.start\n"
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"\t.global\t_start\n"
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"\t.type\t_start,@function\n"
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"_start:\n"
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"\tMOV\tkernel_exit(PC),uPC\n"
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"\tLDI 104,R0\n"
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"\tSW R0,0x41c\n"
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"\tLDI 0xff,R0\n"
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"\tSW R0,0x414\n"
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"\tLDI\t_top_of_stack,SP\n"
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"\tJSR\tentry\n"
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"\tNEXIT\tR0\n"
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"kernel_exit:\n"
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"\tBUSY\n"
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"\t.section\t.text");
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void entry(void) {
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const char *msg = "Hello, World!\r\n", *ptr = msg;
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int count = 0;
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_sys->io_spio = 0x0fa;
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_sys->io_timer = TM_REPEAT | (TM_ONE_SECOND/4);
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_sys->io_pic = INT_ENABLEV(INT_TIMER)|INT_CLEAR(INT_TIMER);
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do {
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zip_idle();
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int picv = _sys->io_pic;
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if (picv & INT_TIMER) {
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int ledv = _sys->io_spio;
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ledv <<= 1;
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ledv = ledv & 0x0f;
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if (ledv == 0)
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ledv = 1;
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_sys->io_spio = ledv | 0x0f0;
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if (*ptr)
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_sys->io_uart = (unsigned)*ptr++;
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if (count++ > 4*60) {
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count = 0;
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ptr = msg;
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}
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}
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_sys->io_pic = INT_ENABLEV(INT_TIMER)|INT_CLEAR(INT_TIMER);
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} while(1);
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}
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// PPONP16P
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// 00120O91
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// 00120NM3
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// 00120E91 = 1183377 ~= 91029 / char, at 0x208d 8333/baud, 83,330 per char
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