VFD now uses SPI to shift data to driver
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15100f6e21
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133
lib/vfd.c
133
lib/vfd.c
@ -23,6 +23,8 @@
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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/stm32/spi.h> // SPI library
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#include <libopencm3/cm3/nvic.h> // interrupt handler
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#include "vfd.h" // VFD definitions
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@ -254,8 +256,11 @@ static const uint8_t pict5x7[][5] = {
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{0x00, 0x00, 0x00, 0x00, 0x00} // nothing
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};
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/* the three 32 bits values to be shifted out to the VFD driver */
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static uint32_t vfd_data[3] = {0};
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/* the 32 bits values to be shifted out to the VFD driver
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* split into 16 bit for SPI transfer */
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static uint32_t vfd_data[VFD_DRIVERS] = {0};
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static uint16_t vfd_spi[VFD_DRIVERS*2] = {0};
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static volatile uint8_t vfd_spi_i = 0;
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char vfd_digits[VFD_DIGITS] = {0};
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char vfd_matrixs[VFD_MATRIX] = {0};
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@ -267,7 +272,12 @@ void vfd_digit(uint8_t nb, char c)
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if (!(nb<VFD_DIGITS)) { // check the digit exists
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return;
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}
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vfd_data[0] = 0;
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// clear data
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for (uint8_t i=0; i<LENGTH(vfd_data); i++) {
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vfd_data[i] = 0;
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}
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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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@ -293,25 +303,29 @@ void vfd_digit(uint8_t nb, char c)
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vfd_data[1] |= (ascii_7segments[i]<<(17)); // add encoded segments to memory
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}
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}
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vfd_data[2] = 0; // last part is not used
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}
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/* set dot matrix <nb> to ASCII character <c>
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* non ASCII characters are used for pictures */
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void vfd_matrix(uint8_t nb, char c)
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{
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if (!(nb<VFD_MATRIX)) { // check the matrix exists
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// check the matrix exists
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if (!(nb<VFD_MATRIX)) {
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return;
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} else if (nb<4) {
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vfd_data[0] = 0;
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vfd_data[1] = 1<<(3-nb); // select matrix
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} else {
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vfd_data[0] = 1<<(35-nb); // select matrix
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vfd_data[1] = 0;
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}
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// clear data
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for (uint8_t i=0; i<LENGTH(vfd_data); i++) {
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vfd_data[i] = 0;
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}
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// select matrix
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if (nb<4) {
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vfd_data[1] = 1<<(3-nb);
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} else {
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vfd_data[0] = 1<<(35-nb);
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}
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vfd_data[2] = 0;
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if ((c<0x80) && (c>=' ')) { // only take printable characters
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uint8_t i = c-' '; // get index for character
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if (i<LENGTH(font5x7)) {
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@ -336,6 +350,20 @@ void vfd_matrix(uint8_t nb, char c)
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/* shift out the VFD data */
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void vfd_shift(void)
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{
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// prepare SPI data
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for (uint8_t i=0; i<LENGTH(vfd_data) && (uint8_t)(i*2+1)<LENGTH(vfd_spi); i++) {
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vfd_spi[i*2] = vfd_data[i];
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vfd_spi[i*2+1] = vfd_data[i]>>16;
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}
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vfd_spi_i = 0;
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spi_enable(VFD_SPI); // enable SPI (the tx empty interrupt will trigger)
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//while (true) {
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//spi_send(VFD_SPI, vfd_spi[vfd_spi_i++]); // send first data (also enables latch)
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//}
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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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@ -350,10 +378,9 @@ void vfd_shift(void)
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}
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}
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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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gpio_clear(VFD_PORT, VFD_NLE); // stop latching data
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*/
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}
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/* transmit every digit and matrix */
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@ -413,18 +440,80 @@ void vfd_test(void)
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}
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}
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/* switch VFD display on */
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void vfd_on(void)
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{
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gpio_clear(VFD_PORT, VFD_STR); // enable HV output
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}
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/* switch VFD display off */
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void vfd_off(void)
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{
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gpio_set(VFD_PORT, VFD_STR); // disable HV output
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}
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/* setup VFD */
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void vfd_setup(void)
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{
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rcc_periph_clock_enable(VFD_RCC); //enable clock for VFD
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rcc_periph_clock_enable(VFD_PORT_RCC); // enable clock for VFD GPIO
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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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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_NLE); // set VFD pin to alternative function push-pull
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vfd_clear(); // initialize values
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//gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_DIN);
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//gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, VFD_CLK);
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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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gpio_clear(VFD_PORT, VFD_NLE); // do not output latched data
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//gpio_set(VFD_PORT, VFD_CLK); // clock is idle high
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rcc_periph_clock_enable(VFD_SPI_RCC); // enable SPI clock
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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, VFD_CLK); // set VFD pin to alternative function push-pull
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gpio_set_mode(VFD_PORT, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, VFD_DIN); // set VFD pin to alternative function push-pull
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spi_reset(VFD_SPI); // clear SPI values
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/* set SPI:
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* - use VFD_SPI port
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* - divide clock by 8 for generating the baudrate (F_PCLK1 is 36MHz, max HV518 is 6MHz)
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* - clock idle high polarity
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* - data is valid on rising edge (second clock phase)
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* - send 16 bits at a time
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* - send least significant bit first (that's how I coded the data)
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*/
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spi_init_master(VFD_SPI, SPI_CR1_BAUDRATE_FPCLK_DIV_64, SPI_CR1_CPOL_CLK_TO_1_WHEN_IDLE, SPI_CR1_CPHA_CLK_TRANSITION_2, SPI_CR1_DFF_16BIT, SPI_CR1_LSBFIRST);
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//spi_set_bidirectional_transmit_only_mode(VFD_SPI); // only use MOSI to transmit
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//spi_set_unidirectional_mode(VFD_SPI); // MISO is unused
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//spi_disable_software_slave_management(VFD_SPI); // use hardware NSS
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spi_enable_software_slave_management(VFD_SPI);
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//spi_enable_ss_output(VFD_SPI); // allow slave select
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spi_set_nss_high(VFD_SPI); // set NSS high
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spi_enable_tx_buffer_empty_interrupt(VFD_SPI); // enable TX empty interrupt
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nvic_enable_irq(VFD_SPI_IRQ); // enable SPI interrupt
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//spi_enable(VFD_SPI);
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//SPI_CR1(VFD_SPI) &= ~SPI_CR1_SSM;
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//SPI_CR2(VFD_SPI) |= SPI_CR2_SSOE;
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vfd_clear(); // initialize values
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}
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#if (VFD_SPI==SPI1)
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void spi1_isr(void)
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#elif (VFD_SPI==SPI2)
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void spi2_isr(void)
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#endif
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{
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if (SPI_SR(VFD_SPI) & SPI_SR_TXE) { // transmission buffer empty
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if (vfd_spi_i<LENGTH(vfd_spi)) { // check if data is available
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gpio_clear(VFD_PORT, VFD_NLE); // slave select to latch data
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spi_send(VFD_SPI, vfd_spi[vfd_spi_i++]); // send next data
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} else { // all data transmitted
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while (SPI_SR(VFD_SPI) & SPI_SR_BSY); // wait until transmission is complete (not sure it's a good idea in an isr)
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gpio_set(VFD_PORT, VFD_NLE); // output latched data
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//spi_set_nss_high(VFD_SPI); // set NSS high
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spi_clean_disable(VFD_SPI); // disable latch to output data
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//spi_set_nss_high(VFD_SPI); // set NSS high
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gpio_set(GPIOA, GPIO1); // toggle LED
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//gpio_set(VFD_PORT, VFD_NLE); // do not output latched data
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}
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}
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}
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37
lib/vfd.h
37
lib/vfd.h
@ -17,14 +17,37 @@
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* it used three chained supertex HV518P shift register VFD drivers */
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/* supertex HV518 VFD driver pins */
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#define VFD_RCC RCC_GPIOA
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/* port on which the pins to control the supertex HV518 VFD driver are
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* we use port A because of the SPI interface */
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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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#define VFD_PORT_RCC RCC_GPIOA
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/* SPI port to use */
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#define VFD_SPI SPI1
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#if (VFD_SPI==SPI1)
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#define VFD_SPI_RCC RCC_SPI1
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#define VFD_SPI_IRQ NVIC_SPI1_IRQ
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#elif (VFD_SPI==SPI2)
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#define VFD_SPI_RCC RCC_SPI2
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#define VFD_SPI_IRQ NVIC_SPI2_IRQ
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#endif
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/* strobe pin to enable high voltage output
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* high voltage is output on low
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* drive using a GPIO PA6 (normally MISO) */
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#define VFD_STR GPIO6
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/* latch enable pin
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* store the shifted data on low
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* output the parallel data on high
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* use the SPI NSS (PA4) */
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#define VFD_NLE GPIO_SPI1_NSS
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/* clock signal
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* drive using SPI SCK (PA5) */
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#define VFD_CLK GPIO_SPI1_SCK
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/* data input, where the data is shifted to
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* drive using SPI MOSI (PA7) */
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#define VFD_DIN GPIO_SPI1_MOSI
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/* the number of blocks available on the VFD */
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#define VFD_DRIVERS 3
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#define VFD_DIGITS 10
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#define VFD_MATRIX 12
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@ -48,5 +71,9 @@ void vfd_clear(void);
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void vfd_test(void);
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/* transmit every digit and matrix */
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void vfd_transmit(void);
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/* switch VFD display on */
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void vfd_on(void);
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/* switch VFD display off */
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void vfd_off(void);
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/* setup VFD */
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void vfd_setup(void);
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8
main.c
8
main.c
@ -27,6 +27,8 @@
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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/spi.h> // SPI library
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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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@ -69,7 +71,7 @@ int main(void)
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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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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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@ -77,6 +79,8 @@ int main(void)
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printf("welcome to the STM32F1 CuVoodoo display driver\n");
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vfd_on(); // switch on VFD
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vfd_test();
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vfd_shift();
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for (uint32_t i = 0; i < 0x800000; i++) {
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@ -84,6 +88,8 @@ int main(void)
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}
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vfd_clear();
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vfd_shift();
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vfd_digit(0,'0');
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vfd_shift();
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bool vfd_flag = false;
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for (uint8_t i=0; i<LENGTH(vfd_digits); i++) {
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