80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
#include "ltimer.h"
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TIM_HandleTypeDef htim2;
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TIM_HandleTypeDef htim4;
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void ltimer_init(void)
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{
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__HAL_RCC_TIM2_CLK_ENABLE();
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htim2.Instance = TIM2;
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htim2.Init.Prescaler = (SystemD2Clock / 1000000) - 1; // 1us
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htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
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htim2.Init.Period = 0xFFFFFFFF;
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htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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HAL_TIM_Base_Init(&htim2);
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__HAL_RCC_TIM4_CLK_ENABLE();
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htim4.Instance = TIM4;
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htim4.Init.Prescaler = 0;
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htim4.Init.CounterMode = TIM_COUNTERMODE_UP;
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htim4.Init.Period = 0xFFFFFFFF;
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htim4.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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HAL_TIM_Base_Init(&htim4);
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TIM_MasterConfigTypeDef sMasterConfig = {0};
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sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
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sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
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HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig);
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TIM_SlaveConfigTypeDef sSlaveConfig = {0};
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sSlaveConfig.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
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sSlaveConfig.InputTrigger = TIM_TS_ITR1;
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HAL_TIM_SlaveConfigSynchro(&htim4, &sSlaveConfig);
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HAL_TIM_Base_Start(&htim2);
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HAL_TIM_Base_Start(&htim4);
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}
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uint64_t ltimer_get_us(void)
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{
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uint32_t tim2_count;
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uint32_t tim4_count_0, tim4_count_1;
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uint64_t us;
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do {
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tim4_count_0 = __HAL_TIM_GET_COUNTER(&htim4);
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tim2_count = __HAL_TIM_GET_COUNTER(&htim2);
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tim4_count_1 = __HAL_TIM_GET_COUNTER(&htim4);
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} while (tim4_count_0 != tim4_count_1);
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us = (uint64_t)tim2_count | ((uint64_t)tim4_count_1 << 32);
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return us;
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}
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uint64_t ltimer_get_ms(void)
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{
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return (ltimer_get_us() + 500) / 1000;
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}
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void ltimer_delay_us(uint32_t us)
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{
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uint64_t start;
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start = ltimer_get_us();
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while (ltimer_get_us() - start < us) {
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}
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}
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void ltimer_delay_ms(uint32_t ms)
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{
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uint64_t start;
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start = ltimer_get_us();
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while (ltimer_get_us() - start < ms * 1000) {
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}
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}
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