STM32F1xx micro-controller C firmware template
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/* This program is free software: you can redistribute it and/or 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 your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <>.
/* Copyright (c) 2016 King Kévin <> */
/* this library is used to drive the vacuum fluorescent display extracted from a Samsung SER-6500 cash register
* it uses three chained supertex HV518 shift register VFD drivers */
/* the number of blocks available on the VFD */
#define VFD_DRIVERS 3
#define VFD_DIGITS 10
#define VFD_MATRIX 12
/* set digit <nb> to ASCII character <c>
* use the MSB of <c> to enable the dot */
void vfd_digit(uint8_t nb, char c);
/* set dot matrix <nb> to ASCII character <c>
* non ASCII characters are used for pictures */
void vfd_matrix(uint8_t nb, char c);
/* clear VFD display */
void vfd_clear(void);
/* test VFD display (light up all anodes) */
void vfd_test(void);
/* transmit every digit and matrix */
void vfd_on(void);
/* switch VFD display off */
void vfd_off(void);
/* setup VFD */
void vfd_setup(void);