今天，我们要利用PS_GPIO、AXI_GPIO、EMIO分别控制OLED来显示不同的页面。首先是建立VIVADO工程。OLEDIP核建立参考http://xilinx.eetrend.com/blog/7899，里面有详尽的说明。按照下图建立工程。

我们这次实验，利用AXI_GPIO连接BTNR，PS通过EMIO连接BTNU，通过PS GPIO连接BTN8、BTN9，对三种方式的GPIO均进行了控制演示。

XDC约束文件为：

#####################OLED################## # DC set_property PACKAGE_PIN U10 [get_ports {OLED[0]}] set_property IOSTANDARD LVCMOS33 [get_ports {OLED[0]}] # RES set_property PACKAGE_PIN U9 [get_ports {OLED[1]}] set_property IOSTANDARD LVCMOS33 [get_ports {OLED[1]}] # SCLK set_property PACKAGE_PIN AB12 [get_ports {OLED[2]}] set_property IOSTANDARD LVCMOS33 [get_ports {OLED[2]}] # SDIN set_property PACKAGE_PIN AA12 [get_ports {OLED[3]}] set_property IOSTANDARD LVCMOS33 [get_ports {OLED[3]}] # "BAT" set_property PACKAGE_PIN U11 [get_ports {OLED[4]}] set_property IOSTANDARD LVCMOS33 [get_ports {OLED[4]}] # "VDD" set_property IOSTANDARD LVCMOS33 [get_ports {OLED[5]}] set_property PACKAGE_PIN U12 [get_ports {OLED[5]}] #######################AXI_GPIO##################### set_property IOSTANDARD LVCMOS25 [get_ports BTNR] set_property PACKAGE_PIN T18 [get_ports BTNU] #######################EMIO####################### set_property IOSTANDARD LVCMOS25 [get_ports BTNU] set_property PACKAGE_PIN R18 [get_ports BTNR] #######################XDC END######################

产生bitstream后，打开SDK，新建立helloworld工程，将helloworld.c改为如下代码：

#include  #include "platform.h" #include "xil_types.h" #include "xgpio.h" #include "xparameters.h" #include "xgpiops.h" #include "xil_io.h" #include "oled.h" //extern char inbyte(void);//调用inbyte接收一个字节输入函数 extern XGpioPs_Config XGpioPs_ConfigTable[XPAR_XGPIOPS_NUM_INSTANCES]; int main() { static XGpioPs psGpioInstancePtr; XGpioPs_Config*GpioConfigPtr; static XGpio GPIOInstance_Ptr; int xStatus,start,end; u32 Readstatus1,Readstatus2; int iPinNumberld9 = 7; /*Ld9 is connected to MIO pin 7*/ int iPinNumberbtn8 = 50;/*Btn8 is connected to MIO pin 50*/ int iPinNumberbtn9 = 51;/*Btn9 is connected to MIO pin 51*/ int iPinNumberBTNU = 54;/*BTNU is connected to EMIO pin 54*/ init_platform(); print("##### Application Starts #####\n\r"); print("\r\n"); //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //Step-1 :AXI GPIO Initialization //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ xStatus = XGpio_Initialize(&GPIOInstance_Ptr,XPAR_AXI_GPIO_0_DEVICE_ID); if(XST_SUCCESS != xStatus) print("GPIO INIT FAILED\n\r"); //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //Step-2 :AXI GPIO Set the Direction //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ XGpio_SetDataDirection(&GPIOInstance_Ptr, 1, 1);//input //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //Step-3 :PS GPIO Intialization //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ GpioConfigPtr = XGpioPs_LookupConfig(XPAR_PS7_GPIO_0_DEVICE_ID); if(GpioConfigPtr == NULL) return XST_FAILURE; xStatus = XGpioPs_CfgInitialize(&psGpioInstancePtr, GpioConfigPtr, GpioConfigPtr->BaseAddr); if(XST_SUCCESS != xStatus) print(" PS GPIO INIT FAILED \n\r"); //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //Step-4 :PS GPIO pin setting to Output //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberld9,1); XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberld9,1); XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberbtn8,0); XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberbtn8,1); XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberbtn9,0); XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberbtn9,1); XGpioPs_SetDirectionPin(&psGpioInstancePtr, iPinNumberBTNU,0); XGpioPs_SetOutputEnablePin(&psGpioInstancePtr, iPinNumberBTNU,1); //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //Step-5 :OLED Intialization //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OLED_Init(); //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ //Step-6 :press btn8 to start Demo //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ OLED_ShowString(0,0, "BTN8 to start"); OLED_Refresh_Gram(); while (1){ start=XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberbtn8); if(start){ XGpioPs_WritePin(&psGpioInstancePtr,iPinNumberld9,1); print("###################### Demo Starts ########################\r\n"); OLED_ShowString(0,0, "DALE I LOVE U"); OLED_ShowString(0,16, "BTNR to go on"); OLED_Refresh_Gram(); break; } end=XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberbtn9); if(end){ XGpioPs_WritePin(&psGpioInstancePtr,iPinNumberld9,0); OLED_Clear(); break; } } while(1){ Readstatus1 = XGpio_DiscreteRead(&GPIOInstance_Ptr, 1) ;//读BTNR if(Readstatus1){ OLED_ShowString(0,0, "DO U LOVE ME ?"); OLED_ShowString(0,16, "BTNU to go on"); OLED_Refresh_Gram(); break; } } while(1){ Readstatus2 = XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberBTNU) ;//读BTNU if(Readstatus2){ OLED_Clear(); OLED_ShowString(0,0, "HAHA BYE"); OLED_ShowString(0,16, "BTN9 to end"); OLED_Refresh_Gram(); } end=XGpioPs_ReadPin(&psGpioInstancePtr, iPinNumberbtn9); if(end){ XGpioPs_WritePin(&psGpioInstancePtr,iPinNumberld9,0); OLED_Clear(); break; } } print("\r\n"); print("***********\r\n"); print("BYE \r\n"); print("***********\r\n"); cleanup_platform(); return 0; }

同时在hellowworld工程下的src文件下插入font.h oled.c oled.h等字体和oled驱动（见附件）。编译通过后，先programmFPGA，然后run，oled出现”BTN8 to start“，按BTN8出现"DALE I LOVE U BTNR to go on”，LD9点亮，按BTNR出现“DO U LOVE ME? BTNU to go on"，按BTNU出现“HAHA BYE BNT9 to end”,最后按BTN9结束Demo，OLED熄灭，LD9熄灭。

oled.rar