jankae/LibreVNA
1
0
Fork 0
mirror of https://github.com/jankae/LibreVNA.git synced 2026-04-06 06:53:37 +00:00
Code Issues Projects Releases Packages Wiki Activity

WIP: preparation for zero span mode

Browse source
This commit is contained in:
Jan Käberich 2022-06-20 01:02:09 +02:00
parent e8560e1a67
commit 6393ae7fc3
22 changed files with 299 additions and 69 deletions
Download patch file Download diff file Expand all files Collapse all files

46
Software/VNA_embedded/Application/Drivers/delay.cpp
View file

@ -2,15 +2,51 @@
#include "stm.hpp"
static volatile uint64_t t_us = 0;
void Delay::Init() {
TIM1->CNT = 0;
// enable update interrupt
TIM1->DIER |= TIM_DIER_UIE;
HAL_NVIC_SetPriority(TIM1_UP_TIM16_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);
TIM1->CR1 |= TIM_CR1_CEN;
}
uint64_t Delay::get_us() {
HAL_NVIC_DisableIRQ(TIM1_UP_TIM16_IRQn);
uint32_t buf = TIM1->CNT;
uint16_t timer_value = buf & 0xFFFF;
uint64_t ret;
if(buf & 0x80000000) {
// UIF bit set, timer overflow not handled yet
ret = t_us + UINT16_MAX + timer_value;
} else {
ret = t_us + timer_value;
}
HAL_NVIC_EnableIRQ(TIM1_UP_TIM16_IRQn);
return ret;
}
void Delay::ms(uint32_t t) {
while(t--) {
us(1000);
}
}
void Delay::us(uint32_t t) {
TIM1->CNT = 0;
TIM1->CR1 |= TIM_CR1_CEN;
while (TIM1->CNT < t)
;
TIM1->CR1 &= ~TIM_CR1_CEN;
uint64_t start = get_us();
while(start + t > get_us());
}
extern "C" {
void TIM1_UP_TIM16_IRQHandler() {
// clear bit
TIM1->SR &= ~TIM_SR_UIF;
// update count
t_us += UINT16_MAX;
}
}