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您好，请问我对例程里的显示部分做了如下注释是否有影响，如果没有影响，为何我在串口输入ls命令为何总是返回Command returned error code FR_NOT_READY，是我硬件连接的问题吗？我是按照spi接线接的。麻烦解答一下，谢谢。
int
main(void)
{
int nStatus;
FRESULT iFResult;
// tRectangle sRect;
//
// Enable lazy stacking for interrupt handlers. This allows floating-point
// instructions to be used within interrupt handlers, but at the expense of
// extra stack usage.
//
ROM_FPULazyStackingEnable();
//
// Set the system clock to run at 50MHz from the PLL.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_4 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);
//
// Enable the peripherals used by this example.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
//
// Configure SysTick for a 100Hz interrupt. The FatFs driver wants a 10 ms
// tick.
//
ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / 100);
ROM_SysTickEnable();
ROM_SysTickIntEnable();
//
// Enable Interrupts
//
ROM_IntMasterEnable();
//
// Initialize the UART as a console for text I/O.
//
ConfigureUART();
//
// Initialize the display driver.
//
// CFAL96x64x16Init();
//
// //
// // Initialize the graphics context.
// //
// GrContextInit(&g_sContext, &g_sCFAL96x64x16);
//
// //
// // Fill the top part of the screen with blue to create the banner.
// //
// sRect.i16XMin = 0;
// sRect.i16YMin = 0;
// sRect.i16XMax = GrContextDpyWidthGet(&g_sContext) - 1;
// sRect.i16YMax = 9;
// GrContextForegroundSet(&g_sContext, ClrDarkBlue);
// GrRectFill(&g_sContext, &sRect);
//
// //
// // Change foreground for white text.
// //
// GrContextForegroundSet(&g_sContext, ClrWhite);
//
// //
// // Put the application name in the middle of the banner.
// //
// GrContextFontSet(&g_sContext, g_psFontFixed6x8);
// GrStringDrawCentered(&g_sContext, "sd_card", -1,
// GrContextDpyWidthGet(&g_sContext) / 2, 4, 0);
//
// //
// // Show some instructions on the display
// //
// GrContextFontSet(&g_sContext, g_psFontFixed6x8);
// GrStringDrawCentered(&g_sContext, "Connect a", -1,
// GrContextDpyWidthGet(&g_sContext) / 2, 20, false);
// GrStringDrawCentered(&g_sContext, "terminal", -1,
// GrContextDpyWidthGet(&g_sContext) / 2, 30, false);
// GrStringDrawCentered(&g_sContext, "to UART0.", -1,
// GrContextDpyWidthGet(&g_sContext) / 2, 40, false);
// GrStringDrawCentered(&g_sContext, "115000,N,8,1", -1,
// GrContextDpyWidthGet(&g_sContext) / 2, 50, false);
//
// Print hello message to user.
//
UARTprintf("\n\nSD Card Example Program\n");
UARTprintf("Type \'help\' for help.\n");
#include "driverlib/pin_map.h"//添加这个头文件
#if 0
/* Peripheral definitions for DK-TM4C123G board */
// SSI port
#define SDC_SSI_BASE SSI0_BASE
#define SDC_SSI_SYSCTL_PERIPH SYSCTL_PERIPH_SSI0
// GPIO for SSI pins
#define SDC_GPIO_PORT_BASE GPIO_PORTA_BASE
#define SDC_GPIO_SYSCTL_PERIPH SYSCTL_PERIPH_GPIOA
#define SDC_SSI_CLK GPIO_PIN_2
#define SDC_SSI_TX GPIO_PIN_5
#define SDC_SSI_RX GPIO_PIN_4
#define SDC_SSI_FSS GPIO_PIN_3
#define SDC_SSI_PINS (SDC_SSI_TX | SDC_SSI_RX | SDC_SSI_CLK | \
SDC_SSI_FSS)
#endif
#if 1
/* Peripheral definitions for DK-TM4C123G board */
// SSI port
#define SDC_SSI_BASE SSI3_BASE
#define SDC_SSI_SYSCTL_PERIPH SYSCTL_PERIPH_SSI3
// GPIO for SSI pins
#define SDC_GPIO_PORT_BASE GPIO_PORTD_BASE
#define SDC_GPIO_SYSCTL_PERIPH SYSCTL_PERIPH_GPIOD
#define SDC_SSI_CLK GPIO_PIN_0
#define SDC_SSI_TX GPIO_PIN_3
#define SDC_SSI_RX GPIO_PIN_2
#define SDC_SSI_FSS GPIO_PIN_1
#define SDC_SSI_PINS (SDC_SSI_TX | SDC_SSI_RX | SDC_SSI_CLK | \
SDC_SSI_FSS)
#endif
static
void power_on (void)
{
/*
* This doesn't really turn the power on, but initializes the
* SSI port and pins needed to talk to the card.
*/
/* Enable the peripherals used to drive the SDC on SSI */
ROM_SysCtlPeripheralEnable(SDC_SSI_SYSCTL_PERIPH);
ROM_SysCtlPeripheralEnable(SDC_GPIO_SYSCTL_PERIPH);
/*
* Configure the appropriate pins to be SSI instead of GPIO. The FSS (CS)
* signal is directly driven to ensure that we can hold it low through a
* complete transaction with the SD card.
*/
ROM_GPIOPinTypeSSI(SDC_GPIO_PORT_BASE, SDC_SSI_TX | SDC_SSI_RX | SDC_SSI_CLK);
ROM_GPIOPinTypeGPIOOutput(SDC_GPIO_PORT_BASE, SDC_SSI_FSS);
/*
* Set the SSI output pins to 4MA drive strength and engage the
* pull-up on the receive line.
*/
MAP_GPIOPadConfigSet(SDC_GPIO_PORT_BASE, SDC_SSI_RX, GPIO_STRENGTH_4MA,
GPIO_PIN_TYPE_STD_WPU);
MAP_GPIOPadConfigSet(SDC_GPIO_PORT_BASE, SDC_SSI_CLK | SDC_SSI_TX | SDC_SSI_FSS,
GPIO_STRENGTH_4MA, GPIO_PIN_TYPE_STD);
#if 1
GPIOPinConfigure(GPIO_PD1_SSI3FSS);
GPIOPinConfigure(GPIO_PD2_SSI3RX);
GPIOPinConfigure(GPIO_PD0_SSI3CLK);
GPIOPinConfigure(GPIO_PD3_SSI3TX);
#endif
/* Configure the SSI0 port */
ROM_SSIConfigSetExpClk(SDC_SSI_BASE, ROM_SysCtlClockGet(),
SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 400000, 8);
ROM_SSIEnable(SDC_SSI_BASE);
/* Set DI and CS high and apply more than 74 pulses to SCLK for the card */
/* to be able to accept a native command. */
send_initial_clock_train();
PowerFlag = 1;
}
