add 7 segment encoder for VFD
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parent
2494256828
commit
cec0a0885a
379
main.c
379
main.c
@ -52,16 +52,12 @@ int _write(int file, char *ptr, int len)
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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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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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rcc_periph_clock_enable(VFD_RCC); //enable clock for VFD
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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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@ -69,66 +65,371 @@ static void gpio_setup(void)
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}
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/* the ten seven segments + dot displays
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* actually they also have a comma and underline, but we want to save space
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*/
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//static uint8_t digits[10];
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/* the twelve 5x7 dot matrix displays
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* the last column dot/bit is not used, making them byte aligned
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*/
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//static uint8_t dots[12][5];
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/* the three 32 bit to be shifted out to the VFD controller
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*/
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static uint32_t vfd_data[3];
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/* shift out the VFD data */
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static void vfd_shift(void)
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{
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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<sizeof(vfd_data)/sizeof(vfd_data[0]); 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); // change data on low
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if (vfd_data[i]&(1<<b)) { // shift the value
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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); // signal need to be valid on high edge
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}
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}
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//printf("\n");
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gpio_set(VFD_PORT, VFD_STR); // disable HV output
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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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// normally there is minimum time before/after the latch
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}
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/* transmit each digit and dot */
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/*
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static void vfd_transmit(void)
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{
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// convert digits
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}
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*/
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/* put digit into memory */
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static void vfd_digit(uint8_t nb, char c)
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{
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(void)c;
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// there are only 10 digits
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if (nb>9) {
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return;
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}
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vfd_data[0] = 0;
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vfd_data[1] = 1<<(4+(9-nb)); // select digit
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/* encode segment
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* here the bit order (classic 7 segment + underline and dot)
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* 3_
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* 8|9_|4
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* 7|6_|5.1
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* 0_2,
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* */
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if (false) { // add the underline (not encoded)
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vfd_data[1] |= (1<<(14));
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}
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if (c&0x80) { // add the dot (encoded in the 8th bit)
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vfd_data[1] |= (1<<(15));
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}
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if (false) { // add the comma (not encoded)
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vfd_data[1] |= (1<<(16));
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}
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uint8_t segment = 0;
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switch (c&0x7f) {
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case '0':
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segment = 0b00111111;
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break;
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case '1':
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segment = 0b00000110;
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break;
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case '2':
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segment = 0b01011011;
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break;
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case '3':
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segment = 0b01001111;
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break;
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case '4':
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segment = 0b01100110;
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break;
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case '5':
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segment = 0b01101101;
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break;
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case '6':
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segment = 0b01111101;
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break;
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case '7':
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segment = 0b00000111;
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break;
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case '8':
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segment = 0b01111111;
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break;
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case '9':
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segment = 0b01101111;
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break;
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case 'a':
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segment = 0b01011111;
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break;
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case 'b':
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segment = 0b01111100;
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break;
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case 'c':
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segment = 0b01011000;
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break;
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case 'd':
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segment = 0b01011110;
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break;
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case 'e':
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segment = 0b01111011;
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break;
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case 'f':
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segment = 0b01110001;
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break;
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case 'g':
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segment = 0b01101111;
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break;
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case 'h':
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segment = 0b01110100;
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break;
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case 'i':
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segment = 0b00010000;
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break;
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case 'j':
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segment = 0b00001100;
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break;
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case 'k':
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segment = 0b01110110;
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break;
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case 'l':
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segment = 0b00110000;
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break;
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case 'm':
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segment = 0b01010100;
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break;
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case 'n':
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segment = 0b01010100;
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break;
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case 'o':
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segment = 0b01011100;
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break;
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case 'p':
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segment = 0b01110011;
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break;
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case 'q':
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segment = 0b01100111;
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break;
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case 'r':
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segment = 0b01010000;
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break;
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case 's':
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segment = 0b01101101;
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break;
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case 't':
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segment = 0b01111000;
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break;
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case 'u':
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segment = 0b00011100;
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break;
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case 'v':
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segment = 0b00011100;
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break;
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case 'w':
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segment = 0b00011100;
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break;
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case 'x':
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segment = 0b01110110;
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break;
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case 'y':
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segment = 0b01101110;
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break;
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case 'z':
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segment = 0b01011011;
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break;
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case 'A':
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segment = 0b01110111;
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break;
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case 'B':
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segment = 0b01111111;
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break;
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case 'C':
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segment = 0b00111001;
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break;
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case 'D':
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segment = 0b01011110;
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break;
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case 'E':
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segment = 0b01111001;
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break;
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case 'F':
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segment = 0b01110001;
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break;
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case 'G':
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segment = 0b00111101;
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break;
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case 'H':
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segment = 0b01110110;
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break;
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case 'I':
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segment = 0b00110000;
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break;
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case 'J':
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segment = 0b00011110;
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break;
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case 'K':
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segment = 0b01110110;
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break;
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case 'L':
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segment = 0b00111000;
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break;
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case 'M':
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segment = 0b00110111;
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break;
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case 'N':
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segment = 0b00110111;
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break;
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case 'O':
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segment = 0b00111111;
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break;
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case 'P':
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segment = 0b01110011;
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break;
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case 'Q':
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segment = 0b01101011;
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break;
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case 'R':
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segment = 0b00110011;
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break;
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case 'S':
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segment = 0b01101101;
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break;
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case 'T':
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segment = 0b01111000;
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break;
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case 'U':
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segment = 0b00111110;
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break;
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case 'V':
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segment = 0b00111110;
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break;
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case 'W':
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segment = 0b00111110;
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break;
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case 'X':
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segment = 0b01110110;
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break;
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case 'Y':
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segment = 0b01101110;
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break;
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case 'Z':
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segment = 0b01011011;
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break;
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case '_':
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segment = 0b00001000;
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break;
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case '-':
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segment = 0b01000000;
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break;
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case ' ':
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segment = 0b00000000;
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break;
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case '\'':
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segment = 0b00100000;
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break;
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case '"':
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segment = 0b00100010;
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break;
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case '/':
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segment = 0b01010010;
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break;
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case '\\':
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segment = 0b01100100;
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break;
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case '=':
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segment = 0b01001000;
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break;
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case ',':
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segment = 0b00010000;
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break;
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case '>':
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segment = 0b01001100;
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break;
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case '<':
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segment = 0b01011000;
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break;
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case '(':
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case '[':
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case '{':
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segment = 0b00111001;
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break;
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case ')':
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case ']':
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case '}':
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segment = 0b00001111;
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break;
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case '@':
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segment = 0b01111011;
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break;
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case '^':
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segment = 0b00100011;
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break;
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case '`':
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segment = 0b00000010;
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break;
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case '|':
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segment = 0b00110000;
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break;
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case '~':
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segment = 0b01000000;
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break;
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default:
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segment = 0x00;
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}
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vfd_data[1] |= (segment<<(17)); // add the segment to memory
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vfd_data[2] = 0;
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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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clock_setup(); // setup main clock
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gpio_setup(); // setup main inputs/ouputs
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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 USART (for printing)
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cdcacm_setup(); // setup USB CDC ACM (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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uint8_t digit = 0;
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uint8_t c = 128;
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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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//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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//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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printf("%u:%c\n",digit,c);
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vfd_digit(digit,c);
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vfd_shift();
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digit = (digit+1)%10;
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c++;
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}
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__WFI(); // go to sleep
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}
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