lm3s stellarisware SPI

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]