lpc3000_iram.mac

来自「NXP LPC系列AMR7的开发程序源码（LCD」· MAC 代码 · 共 37 行

execUserPreload()
{
__var Reg;
  // Halt CPU immediately after reset
  __hwReset(0);
    // Disable WDT
  __writeMemory32(0x00000000,0x400040BC,"Memory");

  // Init clocks
  __writeMemory32(0x2,0x40004050, "Memory");         // SYSCLK_CTRL - Switch to Main oscillator  
  // Set H divider and Per divider
  __writeMemory32(0x0000003D, 0x40004040, "Memory"); // PERIPH_CLK = PLL_CLK*1/16; 
                                                     // HCLK = PLL_CLK*1/2;
  // Set HPLL
  __writeMemory32(0x0001601E, 0x40004058, "Memory"); // HCLKPLL_CTRL OSC * 16 = 208MHz  
  do
  {
    Reg = __readMemory32(0x40004058, "Memory") & 1;  // HCLKPLL_CTRL_bit.LOOK
  }while(!Reg);
  
  // Switch to PLL output and out form the self-refresh of the SDRAM
  Reg = __readMemory32(0x40004044,"Memory");         // PWR_CTRL
  Reg &= ~((1 << 9) | (1 << 8));
  Reg |=   (1 << 2);
  __writeMemory32(Reg, 0x40004044, "Memory");
  Reg |=   (1 << 8);
  __writeMemory32(Reg, 0x40004044, "Memory");
  Reg &=  ~(1 << 8);
  __writeMemory32(Reg, 0x40004044, "Memory");
  
  // Disable 397 PLL
  __writeMemory32(0x00000002, 0x40004048, "Memory"); // PLL397_CTRL disable

  // Map IRAM at 0x00000000
  __writeMemory32(0x00000001, 0x40004014, "Memory"); // BOOT_MAP = 1;
}