Zynq

2023-12-28 17:30| 来源: 网络整理| 查看: 265

1、背景介绍

最近项目中需要做一个JTAG测试功能，该功能是需要在DDR的一段空间中准备一组数据，发送出去，再用DDR的另一段空间收数，判断收到的数是否和发送的数据相同，以此加以验证。为此，需要在ZYNQ PL中实现GPIO通过HP读写DDR实地址的操作，同时在PS中通过ARM实现对发送和接收两段内存区域的读写操作。

2、实现方法

linux中提供了dev/mem来对DDR进行读写，让应用程序可以直接读写DDR实地址，很显然，这里也将采用这一方法。需要注意的是，在映射的过程中一定要加上O_SYNC标志位，这样才能保证Dcache和DDR中数据的一致性，确保读写时不光写入Dcache，也写入DDR中。

代码如下：

/* * Copyright (c) 2012 Xilinx, Inc. All rights reserved. * * Xilinx, Inc. * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A * COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS * ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR * STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION * IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE * FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. * XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO * THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO * ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE * FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS FOR A PARTICULAR PURPOSE. * */ #include #include #include #include //#include #include "gpio.h" void gpio_init() { int temp; int Delay; SetGpioReg(GPIO_STATE_ADDR,0,0); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|jtx07_sbs; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|jtx07_tlr_trst; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|jtx07_tlr_trst6; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|jtag_oe_n; SetGpioReg(GPIO_STATE_ADDR,0,temp); //set ddr send addr and recv addr SetGpioReg(GPIO_ADDR,0,0x10000000); SetGpioReg(GPIO_ADDR,8,0x20000000); //set test data length SetGpioReg(GPIO_WR_LEN_ADDR,0,sector_length); SetGpioReg(GPIO_WR_LEN_ADDR,8,sector_length); //set jtag test clk SetGpioReg(GPIO_JTAG_SEL_ADDR,0,TCK_1_MHz); //release reset signal temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|FPGA_RSTn; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|jtx07_reset; SetGpioReg(GPIO_STATE_ADDR,0,temp); for (Delay = 0; Delay < 8000000; Delay++); //enable jtag test temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|jtag_oe_n; SetGpioReg(GPIO_STATE_ADDR,0,temp); for (Delay = 0; Delay < 8000000; Delay++); //led trigger temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|LED0; SetGpioReg(GPIO_STATE_ADDR,0,temp); } int main() { int i; int fd; int temp; int Delay; int *start; int *start_test; int buf[1024*1024]; for(i=0;i>20); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp&~sjtag_test_start; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp&~FPGA_RSTn; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp&~sjtag_test_prepare; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,8); printf("JTAG STATE IS 0x%x\n",(temp & 0xFFF00000)>>20); temp=GetGpioReg(GPIO_STATE_ADDR,0); temp=temp|FPGA_RSTn; SetGpioReg(GPIO_STATE_ADDR,0,temp); temp=GetGpioReg(GPIO_STATE_ADDR,8); printf("JTAG STATE IS 0x%x\n",(temp & 0xFFF00000)>>20); #endif printf("###########################after jtag start################################\n"); start = (int *)mmap(NULL, 0x400000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x20000000); if(start < 0) { printf("mmap failed."); return -1; } for (i = 0;i

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