add VFD code
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2eff94979e
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30638d643b
49
main.c
49
main.c
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@ -56,11 +56,17 @@ static void clock_setup(void)
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{
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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_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(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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}
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static void gpio_setup(void)
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static void gpio_setup(void)
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{
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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(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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}
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int main(void)
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int main(void)
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@ -70,22 +76,59 @@ int main(void)
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clock_setup(); // setup main clock
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clock_setup(); // setup main clock
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gpio_setup(); // setup main inputs/ouputs
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gpio_setup(); // setup main inputs/ouputs
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usart_setup(); // setup USART (for printing)
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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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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(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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setbuf(stderr, NULL); // set standard error buffer to NULL to immediately print
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printf("welcome to the STM32F1 CuVoodoo example code\n");
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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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/* blink the LED with every transmitted character */
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while (1) {
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while (1) {
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while (usart_received) { // echo every received character
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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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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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printf("%c",usart_getchar()); // transmit receive character
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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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}
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while (cdcacm_received) { // echo every received character
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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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gpio_toggle(LED_PORT, LED_PIN); // toggle LED
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printf("%c",cdcacm_getchar()); // transmit receive character
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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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}
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__WFI(); // go to sleep
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__WFI(); // go to sleep
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}
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}
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8
main.h
8
main.h
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@ -19,5 +19,13 @@
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#define LED_PORT GPIOA
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#define LED_PORT GPIOA
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#define LED_PIN GPIO1
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#define LED_PIN GPIO1
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/* supertex HV518 vacuum fluorescent display pins */
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#define VFD_RCC RCC_GPIOA
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#define VFD_PORT GPIOA
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#define VFD_STR GPIO4
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#define VFD_NLE GPIO5
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#define VFD_CLK GPIO6
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#define VFD_DIN GPIO7
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/* default output (i.e. for printf) */
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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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int _write(int file, char *ptr, int len);
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