43 lines
1020 B
C
43 lines
1020 B
C
#include "one_wire_impl_ll.h"
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onewire_ret_t ow_impl_delay_us(onewire_impl_ll_t *impl, uint32_t usec) {
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if(usec <= 5) return OW_OK;
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LL_RCC_ClocksTypeDef clocks;
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LL_RCC_GetSystemClocksFreq(&clocks);
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uint32_t ticks = (usec - 5) * (clocks.HCLK_Frequency / 1000000);
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SysTick->CTRL = SYSTICK_CLKSOURCE_HCLK;
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SysTick->LOAD = ticks;
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SysTick->VAL = 0U; // Clear this to zero
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// Start the counter
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SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk;
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// Wait until COUNTFLAG has been set.
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while(!(SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk));
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SysTick->CTRL = SYSTICK_CLKSOURCE_HCLK;
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return OW_OK;
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}
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onewire_ret_t ow_impl_drive_dq(onewire_impl_ll_t *impl, uint8_t value) {
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if(value) {
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LL_GPIO_SetOutputPin(impl->GPIOx, impl->PinMask);
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}
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else {
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LL_GPIO_ResetOutputPin(impl->GPIOx, impl->PinMask);
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}
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return OW_OK;
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}
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uint8_t ow_impl_read_dq(onewire_impl_ll_t *impl) {
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return LL_GPIO_IsInputPinSet(impl->GPIOx, impl->PinMask) ? 1 : 0;
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}
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