embeded/Cortex-M3 Ti2015. 10. 5. 16:47

SSIConfigSetExpClk() 에서

모드, 클럭, polarity, 데이터 버스 width를 설정한다.


static void SetSPIFunction(void)

{

SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);


GPIOPinConfigure(GPIO_PA2_SSI0CLK);

GPIOPinConfigure(GPIO_PA3_SSI0FSS);

GPIOPinConfigure(GPIO_PA4_SSI0RX);

GPIOPinConfigure(GPIO_PA5_SSI0TX);


GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 | GPIO_PIN_2);

SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 1000000, 8);

SSIEnable(SSI0_BASE);

}


ssi.h

#define SSI_FRF_MOTO_MODE_0     0x00000000  // Moto fmt, polarity 0, phase 0

#define SSI_FRF_MOTO_MODE_1     0x00000002  // Moto fmt, polarity 0, phase 1

#define SSI_FRF_MOTO_MODE_2     0x00000001  // Moto fmt, polarity 1, phase 0

#define SSI_FRF_MOTO_MODE_3     0x00000003  // Moto fmt, polarity 1, phase 1

#define SSI_FRF_TI              0x00000010  // TI frame format

#define SSI_FRF_NMW             0x00000020  // National MicroWire frame format


#define SSI_MODE_MASTER         0x00000000  // SSI master

#define SSI_MODE_SLAVE          0x00000001  // SSI slave

#define SSI_MODE_SLAVE_OD       0x00000002  // SSI slave with output disabled


[링크 : http://irmus.tistory.com/61]




아두이노의 Atmega 시리즈와 1:1 매칭되려나?


[링크 : https://www.arduino.cc/en/Reference/SPI]

'embeded > Cortex-M3 Ti' 카테고리의 다른 글

lm3s617 stepper rdk  (0) 2015.10.13
lm3s spi / ssi  (0) 2015.10.06
cortex-m3 ROM direct call  (0) 2015.09.25
LM3S Stellarisware - GPIOIntTypeSet  (0) 2015.08.03
bitband / cortex-m3  (0) 2013.08.16
Posted by 구차니