138 lines
4.9 KiB
C
138 lines
4.9 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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/* 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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/* own libraries */
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#include "main.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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/* 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 clock_setup(void)
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{
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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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rcc_periph_clock_enable(LED_RCC); //enable clock for LED
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rcc_periph_clock_enable(VFD_RCC); //enable clock for VFD
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}
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static void gpio_setup(void)
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{
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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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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_STR); // set VFD pin to 'output push-pull'
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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_NLE); // set VFD pin to 'output push-pull'
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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_CLK); // set VFD pin to 'output push-pull'
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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_DIN); // set VFD 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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clock_setup(); // setup main clock
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gpio_setup(); // setup main inputs/ouputs
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usart_setup(); // setup USART (for printing)
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cdcacm_setup(); // setup USART (for printing)
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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 display driver\n");
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printf("sending VFD data\n");
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gpio_set(VFD_PORT, VFD_STR); // disable HV output
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gpio_clear(VFD_PORT, VFD_NLE); // do not latch data
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gpio_set(VFD_PORT, VFD_CLK); // clock is idle high
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bool vfd_transmit = false;
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uint32_t vfd_data[3] = {~0,~0,~0};
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uint8_t bit_flip = 0;
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/* blink the LED with every transmitted character */
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while (1) {
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while (usart_received) { // echo every received character
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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printf("%c",usart_getchar()); // transmit receive character
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vfd_transmit = true;
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}
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while (cdcacm_received) { // echo every received character
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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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printf("%c",cdcacm_getchar()); // transmit receive character
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vfd_transmit = true;
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}
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while (vfd_transmit) {
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vfd_transmit = false;
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/* send data to VFD (data valid on clock high) to 3x32 lines */
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gpio_set(VFD_PORT, VFD_STR); // disable HV output
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gpio_clear(VFD_PORT, VFD_NLE); // do not latch data
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gpio_set(VFD_PORT, VFD_CLK); // clock is idle high
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for (uint8_t i=0; i<3; i++) {
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printf("%08lx ", vfd_data[i]);
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for (uint8_t b=0; b<32; b++) {
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gpio_clear(VFD_PORT, VFD_CLK);
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if (vfd_data[i]&(1<<b)) {
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gpio_set(VFD_PORT, VFD_DIN);
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} else {
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gpio_clear(VFD_PORT, VFD_DIN);
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}
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gpio_set(VFD_PORT, VFD_CLK);
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}
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vfd_data[i] = ~0;
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}
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gpio_set(VFD_PORT, VFD_NLE); // latch data
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gpio_clear(VFD_PORT, VFD_STR); // enable HV output
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printf("\n");
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/* flip bit */
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vfd_data[bit_flip/32] = ~(1<<(bit_flip%32));
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bit_flip = (bit_flip+1)%(3*32);
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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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