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fix: adjust ticks calculation, turn off SYS_SetClock() in keil c51

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IOsetting 2022-07-16 09:42:06 +08:00
parent 691ff86905
commit 5058b6b3dd
1 changed files with 21 additions and 4 deletions
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25
src/fw_sys.c
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@ -14,17 +14,33 @@
#include "fw_sys.h"
/**
* An approximate estimate of instruction cycles in one second, may vary in
* different compilers even differnt versions, adjust it if you find the
* delay too slow or fast.
*/
#if defined (__SDCC_SYNTAX_FIX)
#define __CLK_REF 10000
#elif defined (SDCC) || defined (__SDCC)
#define __CLK_REF 9000
#elif defined __CX51__
#define __CLK_REF 10000
#endif
__CODE uint8_t clkdiv = ((__CONF_CLKDIV == 0)? 1 : __CONF_CLKDIV);
__CODE uint16_t ticks_ms = (__CONF_FOSC / ((__CONF_CLKDIV == 0)? 1 : __CONF_CLKDIV) / 9000);
__CODE uint8_t ticks_us = (__CONF_FOSC / ((__CONF_CLKDIV == 0)? 1 : __CONF_CLKDIV) / 9000000UL);
__CODE uint16_t ticks_ms = (__CONF_FOSC / ((__CONF_CLKDIV == 0)? 1 : __CONF_CLKDIV) / __CLK_REF);
__CODE uint8_t ticks_us = (__CONF_FOSC / ((__CONF_CLKDIV == 0)? 1 : __CONF_CLKDIV) / __CLK_REF / 1000);
/**
* Change system clock
* - invoke this in the beginning of code
* - don't invoke this if the target frequency is already set by STC-ISP
* - For SDCC only.
* - For Keil C51, trim IRC in STC-ISP will be more accurate
* - Invoke this in the beginning of main()
*/
void SYS_SetClock(void)
{
#if defined (SDCC) || defined (__SDCC)
uint16_t i = 0; uint8_t j = 5;
P_SW2 = 0x80;
if (CLKDIV != (__CONF_CLKDIV))
@ -37,6 +53,7 @@ void SYS_SetClock(void)
P_SW2 = 0x00;
SYS_SetFOSC(__CONF_IRCBAND, __CONF_VRTRIM, __CONF_IRTRIM, __CONF_LIRTRIM);
while (--i); // Wait
#endif
}
void SYS_TrimClock(uint8_t vrtrim, uint8_t irtrim)