LM3S9B96的EPI总线的HB8模式配置-EDA365

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LM3S9B96的EPI总线的HB8模式配置

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下面是EPI的HB8模式的例子：

/* Includes -----------------------------------------*/

#include "inc/hw_memmap.h"

#include "inc/hw_types.h"

#include "driverlib/gpio.h"

#include "driverlib/sysctl.h"

#include "driverlib/epi.h"

/* Private variables ------------------------------*/

unsigned char temp;

/*********************************************

* Use the following to specify the GPIO pins used by the HB8 EPI bus.

***********************************************/

#define EPI_PORTC_PINS (GPIO_PIN_7 | GPIO_PIN_6 | GPIO_PIN_5 | GPIO_PIN_4)

#define EPI_PORTD_PINS (GPIO_PIN_3 | GPIO_PIN_2)

#define EPI_PORTE_PINS (GPIO_PIN_1 | GPIO_PIN_0)

#define EPI_PORTF_PINS (GPIO_PIN_5 | GPIO_PIN_4)

#define EPI_PORTG_PINS (GPIO_PIN_7 | GPIO_PIN_1 | GPIO_PIN_0)

#define EPI_PORTH_PINS (GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 | GPIO_PIN_2 | \

GPIO_PIN_1 | GPIO_PIN_0)

#define EPI_PORTJ_PINS (GPIO_PIN_6 | GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 | \

GPIO_PIN_2 | GPIO_PIN_1 | GPIO_PIN_0)

/********************************************************

* A pointer to the EPI Peripheral. Note that g_pusEPIPER is declared

* as volatile so the compiler should not optimize reads out of the image.

**********************************************************/

static volatile unsigned short *g_pusEPIPER;

/**********************************************************

* Function Name : main

* Description : Main program.

* Input : None

* Output : None

* Return : None

***********************************************************/

int main(void)

{

// Set the clocking to run directly from the external crystal/oscillator

SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |

SYSCTL_XTAL_16MHZ);

// The EPI0 peripheral must be enabled for use

SysCtlPeripheralEnable(SYSCTL_PERIPH_EPI0);

// For this example EPI0 is used with multiple pins on PortC, E, F, G, H, and J

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOG);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOH);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);

// configures the internal pin muxes to set the EPI pins for use with EPI

GPIOPinConfigure(GPIO_PH3_EPI0S0);

GPIOPinConfigure(GPIO_PH2_EPI0S1);

GPIOPinConfigure(GPIO_PC4_EPI0S2);

GPIOPinConfigure(GPIO_PC5_EPI0S3);

GPIOPinConfigure(GPIO_PC6_EPI0S4);

GPIOPinConfigure(GPIO_PC7_EPI0S5);

GPIOPinConfigure(GPIO_PH0_EPI0S6);

GPIOPinConfigure(GPIO_PH1_EPI0S7);

GPIOPinConfigure(GPIO_PE0_EPI0S8);

GPIOPinConfigure(GPIO_PE1_EPI0S9);

GPIOPinConfigure(GPIO_PH4_EPI0S10);

GPIOPinConfigure(GPIO_PH5_EPI0S11);

GPIOPinConfigure(GPIO_PF4_EPI0S12);

GPIOPinConfigure(GPIO_PG0_EPI0S13);

GPIOPinConfigure(GPIO_PG1_EPI0S14);

GPIOPinConfigure(GPIO_PF5_EPI0S15);

GPIOPinConfigure(GPIO_PJ0_EPI0S16);

GPIOPinConfigure(GPIO_PJ1_EPI0S17);

GPIOPinConfigure(GPIO_PJ2_EPI0S18);

GPIOPinConfigure(GPIO_PJ3_EPI0S19);

// GPIOPinConfigure(GPIO_PD2_EPI0S20);

// GPIOPinConfigure(GPIO_PD3_EPI0S21);

// GPIOPinConfigure(GPIO_PB5_EPI0S22);

// GPIOPinConfigure(GPIO_PB4_EPI0S23);

GPIOPinConfigure(GPIO_PE2_EPI0S24);

GPIOPinConfigure(GPIO_PE3_EPI0S25);

GPIOPinConfigure(GPIO_PJ4_EPI0S28);

GPIOPinConfigure(GPIO_PJ5_EPI0S29);

GPIOPinConfigure(GPIO_PJ6_EPI0S30);

GPIOPinConfigure(GPIO_PG7_EPI0S31);

// Configure the GPIO pins for EPI mode

GPIOPinTypeEPI(GPIO_PORTC_BASE, EPI_PORTC_PINS);

GPIOPinTypeEPI(GPIO_PORTE_BASE, EPI_PORTE_PINS);

GPIOPinTypeEPI(GPIO_PORTF_BASE, EPI_PORTF_PINS);

GPIOPinTypeEPI(GPIO_PORTG_BASE, EPI_PORTG_PINS);

GPIOPinTypeEPI(GPIO_PORTH_BASE, EPI_PORTH_PINS);

GPIOPinTypeEPI(GPIO_PORTJ_BASE, EPI_PORTJ_PINS);

// Sets the clock divider for the EPI module. In this case set the

// divider to 0, making the EPIClock = SysClk.

EPIDividerSet(EPI0_BASE, 0);

// Sets the usage mode of the EPI module. EPI_MODE_HB8

EPIModeSet(EPI0_BASE, EPI_MODE_HB8);

// 使用相同波特率地址数据不复用 cs信号字节读取

EPIConfigHB8Set(EPI0_BASE, EPI_HB8_MODE_ADDEMUX | EPI_HB8_WRWAIT_1 |

EPI_HB8_RDWAIT_1 | EPI_HB8_CSCFG_CS, 0);

// 映射到片外外设地址0xA000 0000

EPIAddressMapSet(EPI0_BASE, EPI_ADDR_PER_SIZE_256B | EPI_ADDR_PER_BASE_A);

g_pusEPIPER = (unsigned short *)0xA0000000;

// 初始化完毕，就可以使用读写数据了

g_pusEPIPER[0] = 0xff; // 表示向外设地址0处写ff

temp = g_pusEPIPER[0]; // 表示读地址0处的值

}

仅供参考！

关键字：LM3S9B96 EPI总线 HB8模式配置

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