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My timer code is better :)

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This commit is contained in:
Thomas Muller 2023-07-08 22:49:50 -04:00
parent 6d26129dd2
commit c7eb07a9d1
Signed by untrusted user: thomas
GPG key ID: AF006EB730564952
2 changed files with 37 additions and 0 deletions
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34
Debug/debug.c
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@ -23,6 +23,29 @@ void Delay_Init(void)
{
p_us = SystemCoreClock / 8000000;
p_ms = (uint16_t)p_us * 1000;
SysTick->CTLR &= ~0x8000001F;
SysTick->CTLR |= (1 << 0);
}
uint64_t SysTick_Read(void)
{
uint64_t ticks;
SysTick->CTLR &= ~(1 << 0);
ticks = SysTick->CNT;
SysTick->CTLR |= (1 << 0);
return ticks;
}
uint64_t SysTick_Us(void)
{
return SysTick_Read() / p_us;
}
uint64_t SysTick_Ms(void)
{
return SysTick_Read() / p_ms;
}
/*********************************************************************
@ -41,12 +64,18 @@ void Delay_Us(uint32_t n)
SysTick->SR &= ~(1 << 0);
i = (uint32_t)n * p_us;
SysTick->CMP = SysTick_Read() + i;
while((SysTick->SR & (1 << 0)) != (1 << 0));
/*
SysTick->CMP = i;
SysTick->CTLR |= (1 << 4);
SysTick->CTLR |= (1 << 5) | (1 << 0);
while((SysTick->SR & (1 << 0)) != (1 << 0));
SysTick->CTLR &= ~(1 << 0);
*/
}
/*********************************************************************
@ -65,12 +94,17 @@ void Delay_Ms(uint32_t n)
SysTick->SR &= ~(1 << 0);
i = (uint32_t)n * p_ms;
SysTick->CMP = SysTick_Read() + i;
while((SysTick->SR & (1 << 0)) != (1 << 0));
/*
SysTick->CMP = i;
SysTick->CTLR |= (1 << 4);
SysTick->CTLR |= (1 << 5) | (1 << 0);
while((SysTick->SR & (1 << 0)) != (1 << 0));
SysTick->CTLR &= ~(1 << 0);
*/
}
/*********************************************************************

3
Debug/debug.h
View file

@ -29,6 +29,9 @@ extern "C" {
//#define DEBUG DEBUG_UART3
void Delay_Init(void);
uint64_t SysTick_Read(void);
uint64_t SysTick_Us(void);
uint64_t SysTick_Ms(void);
void Delay_Us(uint32_t n);
void Delay_Ms(uint32_t n);
void USART_Printf_Init(uint32_t baudrate);