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application: add timer for monitor command activity

This commit is contained in:
King Kévin 2021-03-25 14:48:40 +01:00
parent 577e5511a2
commit 734be00a82
1 changed files with 27 additions and 3 deletions
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30
application.c
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@ -26,6 +26,7 @@
#include <libopencm3/stm32/desig.h> // design utilities
#include <libopencm3/stm32/flash.h> // flash utilities
#include <libopencm3/stm32/adc.h> // ADC utilities
#include <libopencm3/stm32/timer.h> // timer library
/* own libraries */
#include "global.h" // board definitions
@ -73,6 +74,9 @@ static const uint32_t channel_pins[] = {GPIO_PIN(PB12), GPIO_PIN(PB13), GPIO_PIN
static uint8_t channel_start = 0; /**< first signal of range to probe */
static uint8_t channel_stop = CHANNEL_NUMBERS - 1; /**< last signal of range to probe */
/** timer ID for timer to measure activity timing */
#define MONITOR_TIMER 2
size_t putc(char c)
{
size_t length = 0; // number of characters printed
@ -428,6 +432,18 @@ static void command_monitor(void* argument)
}
puts("\n");
// setup timer to measure milliseconds
rcc_periph_clock_enable(RCC_TIM(MONITOR_TIMER)); // enable clock for timer peripheral
rcc_periph_reset_pulse(RST_TIM(MONITOR_TIMER)); // reset timer state
timer_disable_counter(TIM(MONITOR_TIMER)); // disable timer to configure it
timer_set_mode(TIM(MONITOR_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(TIM(MONITOR_TIMER), (rcc_ahb_frequency / 2000) - 1); // generate half millisecond ticks (prescaler is not large enough for milliseconds)
timer_set_period(TIM(MONITOR_TIMER), 2000 - 1); // set period to seconds
timer_clear_flag(TIM(MONITOR_TIMER), TIM_SR_UIF); // clear update (overflow) flag
timer_update_on_overflow(TIM(MONITOR_TIMER)); // only use counter overflow as UEV source (use overflow as start time or timeout)
uint32_t seconds = 0; // count the seconds using the overflow
timer_enable_counter(TIM(MONITOR_TIMER)); // enable timer
// start monitoring
uint16_t gpioa_data = UINT16_MAX;
uint16_t gpiob_data = UINT16_MAX;
@ -438,12 +454,17 @@ static void command_monitor(void* argument)
wakeup_flag = false; // clear flag
second_flag = false; // clear flag
}
// one second has passed
if (timer_get_flag(TIM(MONITOR_TIMER), TIM_SR_UIF)) {
timer_clear_flag(TIM(MONITOR_TIMER), TIM_SR_UIF); // clear flag
seconds++; // count the second
}
// check is there is a change on a channel
const uint16_t gpioa_new = gpio_get(GPIOA, gpioa_mask);
const uint16_t gpiob_new = gpio_get(GPIOB, gpioa_mask);
if (gpioa_new != gpioa_data || gpiob_new != gpiob_data) {
// print data
puts("0000.000");
printf("%04u.%03u", seconds, timer_get_counter(TIM(MONITOR_TIMER)) / 2);
for (uint8_t i = channel_start; i <= channel_stop; i++) {
const uint16_t port = (GPIOA == channel_ports[i] ? gpioa_new : gpiob_new);
const uint8_t high = ((port & channel_pins[i]) ? 1 : 0);
@ -462,10 +483,13 @@ static void command_monitor(void* argument)
}
user_input_get(); // clean input
// set all back to input
for (uint8_t i = channel_start; i <= channel_stop; i++) {
// clean up
for (uint8_t i = channel_start; i <= channel_stop; i++) { // set all back to input
gpio_mode_setup(channel_ports[i], GPIO_MODE_INPUT, GPIO_PUPD_NONE, channel_pins[i]); // ensure pin is floating input
}
timer_disable_counter(TIM(MONITOR_TIMER)); // disable timer
rcc_periph_reset_pulse(RST_TIM(MONITOR_TIMER)); // reset timer state
rcc_periph_clock_disable(RCC_TIM(MONITOR_TIMER)); // disable clock for timer peripheral
}
/** set first channel of range to scan