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use timer to output data

This commit is contained in:
King Kévin 2016-01-24 20:33:11 +01:00
parent 515ecdfa3a
commit 486d80f00d
3 changed files with 34 additions and 6 deletions
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32
lib/vfd.c
View File

@ -477,6 +477,18 @@ void vfd_off(void)
gpio_set(VFD_PORT, VFD_STR); // disable HV output
}
/* output data on the parts */
void vfd_refresh_on(void)
{
timer_enable_counter(VFD_TIMER); // start timer to periodically output that to the parts
}
/* stop outputting data on the parts*/
void vfd_refresh_off(void)
{
timer_disable_counter(VFD_TIMER); // stop timer to periodically output that to the parts
}
/* setup VFD */
void vfd_setup(void)
{
@ -522,11 +534,9 @@ void vfd_setup(void)
timer_reset(VFD_TIMER); // reset timer state
timer_set_mode(VFD_TIMER, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP); // set timer mode, use undivided timer clock,edge alignment (simple count), and count up
timer_set_prescaler(VFD_TIMER, (SYSTEM_CLOCK_FREQ/(1<<16))-1); // set the prescaler so this 16 bits timer overflows at 1Hz
//timer_set_period(0xffff/(VFD_DIGITS+VFD_MATRIX)/150); // set the refresh frequency
timer_set_period(VFD_TIMER, 0xfffff);
timer_set_period(VFD_TIMER, 0xffff/(VFD_DIGITS+VFD_MATRIX)/150); // set the refresh frequency
timer_enable_irq(VFD_TIMER, TIM_DIER_UIE); // enable interrupt for timer
nvic_enable_irq(VFD_TIMER_IRQ); // allow interrupt for timer
timer_enable_counter(VFD_TIMER); // enable timer
vfd_clear(); // initialize values
}
@ -557,9 +567,21 @@ void tim4_isr(void)
void tim5_isr(void)
#endif
{
static uint8_t vfd_mux = 0; // which part to output
if (timer_get_flag(VFD_TIMER, TIM_SR_UIF)) { // overflow even happened
timer_clear_flag(VFD_TIMER, TIM_SR_UIF); // clear flag
gpio_toggle(LED_PORT, LED_PIN); // toggle LED
if (vfd_mux<LENGTH(vfd_digits)) {
if (vfd_digits[vfd_mux]!=0) { // skip unused digits
vfd_digit(vfd_mux,vfd_digits[vfd_mux]); // set digit
vfd_shift(); // shift out data
}
} else if (vfd_mux<LENGTH(vfd_digits)+LENGTH(vfd_matrixs)) {
if (vfd_matrixs[vfd_mux-LENGTH(vfd_digits)]!=0) { // skip unused matrix
vfd_matrix(vfd_mux-LENGTH(vfd_digits),vfd_matrixs[vfd_mux-LENGTH(vfd_digits)]); // set matrix
vfd_shift(); // shift out data
}
}
vfd_mux = (vfd_mux+1)%(LENGTH(vfd_digits)+LENGTH(vfd_matrixs)); // got to next segment
}
//gpio_toggle(LED_PORT, LED_PIN); // toggle LED
}

4
lib/vfd.h
View File

@ -45,5 +45,9 @@ void vfd_transmit(void);
void vfd_on(void);
/* switch VFD display off */
void vfd_off(void);
/* output data on the parts */
void vfd_refresh_on(void);
/* stop outputing data on the parts*/
void vfd_refresh_off(void);
/* setup VFD */
void vfd_setup(void);

4
main.c
View File

@ -93,6 +93,7 @@ int main(void)
vfd_shift();
bool vfd_flag = false;
bool refresh = true;
for (uint8_t i=0; i<LENGTH(vfd_digits); i++) {
vfd_digits[i] = '0'+i;
}
@ -111,7 +112,8 @@ int main(void)
while (vfd_flag) {
vfd_flag = false;
gpio_toggle(LED_PORT, LED_PIN); // toggle LED
vfd_transmit();
refresh ? vfd_refresh_on() : vfd_refresh_off();
refresh = !refresh;
}
__WFI(); // go to sleep
}