void Reset_Handler(void) {
// Copy the data sections from flash to SRAM.
unsigned int LoadAddr, ExeAddr, SectionLen;
unsigned int *SectionTableAddr;
// Load base address of Global Section Table
SectionTableAddr = &__data_section_table;
// Copy the data sections from flash to SRAM.
while (SectionTableAddr < &__data_section_table_end) {
LoadAddr = *SectionTableAddr++;
ExeAddr = *SectionTableAddr++;
SectionLen = *SectionTableAddr++;
data_init(LoadAddr, ExeAddr, SectionLen);
}
// At this point, SectionTableAddr = &__bss_section_table;
// Zero fill the bss segment
while (SectionTableAddr < &__bss_section_table_end) {
ExeAddr = *SectionTableAddr++;
SectionLen = *SectionTableAddr++;
bss_init(ExeAddr, SectionLen);
}
#if STARTUP_DELAY
volatile unsigned int i;
for(i=0; i<STARTUP_DELAY; i++);
#endif
// Set clock mode, DEFAULT_CLOCK is defined in config.h, and the default behaviour
// is to set the clock to 72MHz from the external crystal. Using defines here to
// reduce code space
#if DEFAULT_CLOCK == XTAL
ClockModeXTAL();
#elif DEFAULT_CLOCK == IRC72
ClockModeIRC72();
#elif DEFAULT_CLOCK == IRC12
ClockModeIRC12();
#endif
LPC_SYSCON->SYSAHBCLKDIV = 1;
LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 6) | (1 << 16);
// Set all pins to digital inputs (except P0[0] which is the reset button)
#if PORT_STARTUP_INIT
Port0Init(ALL & ~PIN0);
Port1Init(ALL);
#endif
// Initialise and start the system tick timer if allowed by the SYSTICK_EN
// definition in config.h, if the system tick timer is running, then the Delay()
// function will use it, otherwise Delay() will use a fixed loop which is not
// accurate when there are interrupts running, as any interrupt would stop the
// loop and cuase the delay to be longer than expected
#if SYSTICK_EN && SYSTICK_STARTUP
SysTickInit();
#endif
// Run the user-supplied setup() function if it exists
if(setup) {
setup();
}
// Run the user-supplied main() function if it exists
if(main) {
main();
}
// Loop the user-supplied setup() function if it exists
if(loop) {
while(1) loop();
}
// Do nothing (except handle interrupts)
while(1);
}
// *** This is the startup code
void Reset_Handler(void) {
unsigned long *pSrc, *pDest;
unsigned int i;
// Initialise RAM
pSrc = &_etext;
for(pDest=&__data; pDest<&__edata; ) {
*pDest++ = *pSrc++;
}
for(pDest=&__bss; pDest<&__ebss; ) {
*pDest++ = 0;
}
// Initialise the uninitialised variable described in section 19.2.1 of UM10365
*((uint32_t *)(0x10000054)) = 0x0;
#if STARTUP_DELAY
for(i=0; i<STARTUP_DELAY; i++);
#endif
// Set clock mode, DEFAULT_CLOCK is defined in config.h, and the default behaviour
// is to set the clock to 72MHz from the external crystal. Using defines here to
// reduce code space
#if DEFAULT_CLOCK == XTAL
LPC_SYSCON->PDRUNCFG &= ~(1 << 5); // Power up system oscillator
for(i = 0; i < 100; i++); // Brief delay
LPC_SYSCON->SYSOSCCTRL = 0; // System oscillator setup - not bypass, 1-20MHz range
LPC_SYSCON->SYSPLLCLKSEL = 0x01; // Select system oscillator as PLL source
LPC_SYSCON->SYSPLLCLKUEN = 0x00; // Update clock source
LPC_SYSCON->SYSPLLCLKUEN = 0x01;
while(!(LPC_SYSCON->SYSPLLCLKUEN & 0x01)); // Wait for update
LPC_SYSCON->MAINCLKSEL = 0x01; // Select sys osc as main clock source
LPC_SYSCON->MAINCLKUEN = 0x00; // Update clock source
LPC_SYSCON->MAINCLKUEN = 0x01;
while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); // Wait for clock update
LPC_SYSCON->SYSPLLCTRL = 0x25; // Select PLL divider to 6 (12MHz - 72MHz)
LPC_SYSCON->PDRUNCFG &= ~(1 << 7); // Power up PLL
while(!(LPC_SYSCON->SYSPLLSTAT & 0x01)); // Wait for PLL lock
LPC_SYSCON->MAINCLKSEL = 0x03; // Select PLL as main clock source
LPC_SYSCON->MAINCLKUEN = 0x00; // Update clock source
LPC_SYSCON->MAINCLKUEN = 0x01;
while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); // Wait for clock update
#elif DEFAULT_CLOCK == IRC72
LPC_SYSCON->PDRUNCFG &= ~((1<<0) | (1<<1)); // Power up IRC oscillator
for(i = 0; i < 100; i++); // Brief delay
LPC_SYSCON->MAINCLKSEL = 0x00; // Select IRC as main clock source
LPC_SYSCON->MAINCLKUEN = 0x00; // Update clock source
LPC_SYSCON->MAINCLKUEN = 0x01;
while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); // Wait for clock update
LPC_SYSCON->SYSPLLCLKSEL = 0x00; // Select IRC as PLL source
LPC_SYSCON->SYSPLLCLKUEN = 0x00; // Update clock source
LPC_SYSCON->SYSPLLCLKUEN = 0x01;
while(!(LPC_SYSCON->SYSPLLCLKUEN & 0x01)); // Wait for update
LPC_SYSCON->SYSPLLCTRL = 0x25; // Select PLL divider to 6 (12MHz - 72MHz)
LPC_SYSCON->PDRUNCFG &= ~(1<<7); // Power up PLL
while(!(LPC_SYSCON->SYSPLLSTAT & 0x01)); // Wait for PLL lock
LPC_SYSCON->MAINCLKSEL = 0x03; // Select PLL as main clock source
LPC_SYSCON->MAINCLKUEN = 0x00; // Update clock source
LPC_SYSCON->MAINCLKUEN = 0x01;
while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); // Wait for clock update
LPC_SYSCON->PDRUNCFG |= (1<<5); // Power down system oscillator
#elif DEFAULT_CLOCK == IRC12
LPC_SYSCON->PDRUNCFG &= ~((1<<0) | (1<<1)); // Power up IRC oscillator
for(i = 0; i < 100; i++); // Brief delay
LPC_SYSCON->MAINCLKSEL = 0x00; // Select IRC as main clock source
LPC_SYSCON->MAINCLKUEN = 0x00; // Update clock source
LPC_SYSCON->MAINCLKUEN = 0x01;
while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); // Wait for clock update
LPC_SYSCON->PDRUNCFG |= ((1<<5) | (1<<7)); // Power down system oscillator and IRC
#endif
// Set all pins to digital inputs (except P0[0] which is the reset button)
#if PORT_STARTUP_INIT
Port0Init(ALL & ~PIN0);
Port1Init(ALL);
Port2Init(ALL);
Port3Init(ALL);
#endif
// Initialise and start the system tick timer if allowed by the SYSTICK_EN
// definition in config.h, if the system tick timer is running, then the Delay()
// function will use it, otherwise Delay() will use a fixed loop which is not
// accurate when there are interrupts running, as any interrupt would stop the
// loop and cuase the delay to be longer than expected
#if SYSTICK_EN && SYSTICK_STARTUP
SysTickInit();
#endif
// Run the user-supplied setup() function if it exists
if(setup) {
setup();
}
// Run the user-supplied main() function if it exists
if(main) {
main();
}
// Loop the user-supplied setup() function if it exists
if(loop) {
while(1) loop();
}
// Do nothing (except handle interrupts)
while(1);
}
