DSP2833x_SysCtrl.c
위 파일에서 InitPeripheralClocks 함수가 있다.
이 함수에서는 HISPCP/LOSPCP 프리스케일 세팅뿐만 아니라 dsp28335에서 제공하는 각종 기능성 레지스터들의 기능 여부를 선택할 수 있다. 아래의 빨간 글씨 부분이다.
void InitPeripheralClocks(void)
{
EALLOW;
// HISPCP/LOSPCP prescale register settings, normally it will be set to default values
SysCtrlRegs.HISPCP.all = 0x0001; //HSPCLK=SYSCLKOUT/2=75MHz
//SysCtrlRegs.LOSPCP.all = 0x0003; //LSPCLK=SYSCLKOUT/6=25MHz
SysCtrlRegs.LOSPCP.all = 0x0002; //LSPCLK=SYSCLKOUT/4=37.5MHz
// XCLKOUT to SYSCLKOUT ratio. By default XCLKOUT = 1/4 SYSCLKOUT
// XTIMCLK = SYSCLKOUT/2
XintfRegs.XINTCNF2.bit.XTIMCLK = 1;
// XCLKOUT = XTIMCLK/2
XintfRegs.XINTCNF2.bit.CLKMODE = 1;
// Enable XCLKOUT
XintfRegs.XINTCNF2.bit.CLKOFF = 0;
// Peripheral clock enables set for the selected peripherals.
// If you are not using a peripheral leave the clock off
// to save on power.
//
// Note: not all peripherals are available on all 2833x derivates.
// Refer to the datasheet for your particular device.
//
// This function is not written to be an example of efficient code.
SysCtrlRegs.PCLKCR0.bit.ADCENCLK = 1; // ADC
// *IMPORTANT*
// The ADC_cal function, which copies the ADC calibration values from TI reserved
// OTP into the ADCREFSEL and ADCOFFTRIM registers, occurs automatically in the
// Boot ROM. If the boot ROM code is bypassed during the debug process, the
// following function MUST be called for the ADC to function according
// to specification. The clocks to the ADC MUST be enabled before calling this
// function.
// See the device data manual and/or the ADC Reference
// Manual for more information.
ADC_cal();
SysCtrlRegs.PCLKCR0.bit.I2CAENCLK = 0; // I2C
SysCtrlRegs.PCLKCR0.bit.SCIAENCLK = 1; // SCI-A
SysCtrlRegs.PCLKCR0.bit.SCIBENCLK = 1; // SCI-B
SysCtrlRegs.PCLKCR0.bit.SCICENCLK = 0; // SCI-C
SysCtrlRegs.PCLKCR0.bit.SPIAENCLK = 1; // SPI-A
SysCtrlRegs.PCLKCR0.bit.MCBSPAENCLK = 0; // McBSP-A
SysCtrlRegs.PCLKCR0.bit.MCBSPBENCLK = 0; // McBSP-B
SysCtrlRegs.PCLKCR0.bit.ECANAENCLK=0; // eCAN-A
SysCtrlRegs.PCLKCR0.bit.ECANBENCLK=0; // eCAN-B
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; // Disable TBCLK within the ePWM
SysCtrlRegs.PCLKCR1.bit.EPWM1ENCLK = 1; // ePWM1
SysCtrlRegs.PCLKCR1.bit.EPWM2ENCLK = 0; // ePWM2
SysCtrlRegs.PCLKCR1.bit.EPWM3ENCLK = 0; // ePWM3
SysCtrlRegs.PCLKCR1.bit.EPWM4ENCLK = 0; // ePWM4
SysCtrlRegs.PCLKCR1.bit.EPWM5ENCLK = 0; // ePWM5
SysCtrlRegs.PCLKCR1.bit.EPWM6ENCLK = 0; // ePWM6
SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; // Enable TBCLK within the ePWM
SysCtrlRegs.PCLKCR1.bit.ECAP3ENCLK = 0; // eCAP3
SysCtrlRegs.PCLKCR1.bit.ECAP4ENCLK = 0; // eCAP4
SysCtrlRegs.PCLKCR1.bit.ECAP5ENCLK = 0; // eCAP5
SysCtrlRegs.PCLKCR1.bit.ECAP6ENCLK = 0; // eCAP6
SysCtrlRegs.PCLKCR1.bit.ECAP1ENCLK = 0; // eCAP1
SysCtrlRegs.PCLKCR1.bit.ECAP2ENCLK = 0; // eCAP2
SysCtrlRegs.PCLKCR1.bit.EQEP1ENCLK = 1; // eQEP1
SysCtrlRegs.PCLKCR1.bit.EQEP2ENCLK = 1; // eQEP2
SysCtrlRegs.PCLKCR3.bit.CPUTIMER0ENCLK = 1; // CPU Timer 0
SysCtrlRegs.PCLKCR3.bit.CPUTIMER1ENCLK = 1; // CPU Timer 1
SysCtrlRegs.PCLKCR3.bit.CPUTIMER2ENCLK = 0; // CPU Timer 2
SysCtrlRegs.PCLKCR3.bit.DMAENCLK = 0; // DMA Clock
SysCtrlRegs.PCLKCR3.bit.XINTFENCLK = 1; // XTIMCLK
SysCtrlRegs.PCLKCR3.bit.GPIOINENCLK = 1; // GPIO input clock
EDIS;
}
DSP28xxx_SectionCopy_nonBIOS.asm
TMS320F28x CPU이해.ppt
tms320f28335.pdf
관련 문서.zip
