167 lines
5.9 KiB
C
167 lines
5.9 KiB
C
/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/* Copyright (c) 2016 King Kévin <kingkevin@cuvoodoo.info> */
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdio.h> // standard I/O facilities
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#include <stdlib.h> // standard utilities
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#include <unistd.h> // standard streams
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#include <errno.h> // error number utilities
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#include <string.h> // stting utilities
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/cm3/scb.h> // vector table definition
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#include <libopencmsis/core_cm3.h> // Cortex M3 utilities
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#include <libopencm3/stm32/timer.h>
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#include <libopencm3/cm3/nvic.h>
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/* own libraries */
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#include "global.h" // board definitions
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#include "usart.h" // USART utilities
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#include "usb_cdcacm.h" // USB CDC ACM utilities
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#include "vfd.h" // VFD driver
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/* default output (i.e. for printf) */
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int _write(int file, char *ptr, int len)
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{
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int i;
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if (file == STDOUT_FILENO || file == STDERR_FILENO) {
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for (i = 0; i < len; i++) {
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if (ptr[i] == '\n') { // add carrier return before line feed. this is recommended for most UART terminals
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usart_putchar_nonblocking('\r'); // a second line feed doesn't break the display
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cdcacm_putchar('\r'); // a second line feed doesn't break the display
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}
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usart_putchar_nonblocking(ptr[i]); // send byte over USART
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cdcacm_putchar(ptr[i]); // send byte over USB
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}
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return i;
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}
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errno = EIO;
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return -1;
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}
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static void gpio_setup(void)
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{
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rcc_periph_clock_enable(LED_RCC); //enable clock for LED
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gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_PIN); // set LED pin to 'output push-pull'
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}
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int main(void)
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{
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SCB_VTOR = (uint32_t) 0x08002000; // relocate vector table because of the bootloader
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rcc_clock_setup_in_hse_8mhz_out_72mhz(); // use 8 MHz high speed external clock to generate 72 MHz internal clock
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gpio_setup(); // setup main inputs/outputs
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usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (for printing)
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vfd_setup(); // setup VFD
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setbuf(stdout, NULL); // set standard out buffer to NULL to immediately print
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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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printf("welcome to the STM32F1 CuVoodoo vacuum fluorescent display driver\n");
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printf("testing VFD\n");
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vfd_on(); // switch on VFD
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vfd_test(); // show all anodes
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for (uint32_t i = 0; i < 0x800000; i++) { // show for a bit of time
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__asm__("nop");
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}
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vfd_clear(); // clear all data
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printf("scrolling message\n");
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const char* message = " follow the white rabbit "; // message to display (shifted by left-padded by VFD_MATRIX (12), right padded by VFD_MATRIX-VFD_DIGITS (2))
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for (uint8_t i=0; i<strlen(message); i++) { // scroll through message (from right to left)
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vfd_clear(); // clear display
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for (uint8_t j=i; j<strlen(message); j++) { // display message
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if (j+2<(uint8_t)strlen(message)) { // align VFD_MATRIX (12) to VFD_DIGITS (10)
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vfd_digit(j-i,message[j+2]); // shift the matrix display
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}
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vfd_matrix(j-i,message[j]); // show digit
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}
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for (uint32_t j = 0; j < 0x200000; j++) { // show for a bit of time
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__asm__("nop");
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}
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}
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vfd_clear(); // clear all data
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printf("showing animation\n");
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// show rabbit + number animation
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const uint8_t animation[] = {2,3,2,3,2,3,7,6,7,6,7,6}; // rabbit animation (using pict5x7)
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for (uint8_t i=0; i<sizeof(animation) && i<VFD_MATRIX; i++) {
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vfd_clear(); // clear display
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vfd_matrix(i,0x80+animation[i]); // show rabbit
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for (uint8_t j=0; j<50; j++) {
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for (uint8_t k=0; k<VFD_DIGITS; k++) {
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vfd_digit(k,'0'+(rand()%10)); // show (not very) random number
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for (uint32_t l = 0; l<0x4000; l++) { // show for a bit of time
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__asm__("nop");
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}
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}
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}
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}
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vfd_clear(); // clear all data
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printf("type to display\n");
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uint8_t vfd_place = 0; // the place on which the next character will be displayed on the VFD
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bool vfd_flag = false; // do something with the VFD
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char c = 0; // the character to display
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char previous_line[VFD_DIGITS] = {0};
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while (true) {
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while (usart_received) { // echo every received character
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c = usart_getchar();
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vfd_flag = true; // display character
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}
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while (cdcacm_received) { // echo every received character
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c = cdcacm_getchar();
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vfd_flag = true; // display character
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}
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while (vfd_flag) {
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vfd_flag = false;
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printf("%c", c); // transmit receive character
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED to show activity
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if (c=='\r' || c=='\n') { // on (new) newline
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if (vfd_place>0) { // only on new newline
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vfd_clear(); // clear display
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vfd_place = 0; // restart from beginning
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// show previous line on digits (and clear it)
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for (uint8_t i=0; i<LENGTH(previous_line) && i<VFD_DIGITS; i++) {
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vfd_digit(i,previous_line[i]);
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previous_line[i] = 0;
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}
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}
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} else {
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// show typed character for current line on matrix
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if (vfd_place < VFD_MATRIX) {
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vfd_matrix(vfd_place,c); // display character on digit
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}
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// save character for the net previous line
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if (vfd_place < LENGTH(previous_line)) {
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previous_line[vfd_place] = c;
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}
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vfd_place++; // go to next place (you can overflow it and confuse the newline)
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}
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}
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__WFI(); // go to sleep
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}
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return 0;
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}
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