MYIR-ZYNQ7000系列-zturn教程(11)：i2c对24c32进行读写
开发板环境：vivado 2017.1 ，开发板型号xc7z020clg400-1，这个工程主要是用i2c对24c32进行读写
链接：https://pan.baidu.com/s/1EjVY9kjybUKg3oegKkx2BA
提取码：dgcm
Step1 新建工程然后按照下面截图中进行配置（主要配置了DDR、i2c）
配置完成后进行综合、生成顶层文件，生成的顶层文件如下图所示
//Copyright 1986-2017 Xilinx, Inc. All Rights Reserved.
//--------------------------------------------------------------------------------
//Tool Version: Vivado v.2017.1 (win64) Build 1846317 Fri Apr 14 18:55:03 MDT 2017
//Date : Sun Feb 18 22:06:05 2018
//Host : MS-20180107KQQK running 64-bit Service Pack 1 (build 7601)
//Command : generate_target design_1_wrapper.bd
//Design : design_1_wrapper
//Purpose : IP block netlist
//--------------------------------------------------------------------------------
`timescale 1 ps / 1 psmodule design_1_wrapper(DDR_addr,DDR_ba,DDR_cas_n,DDR_ck_n,DDR_ck_p,DDR_cke,DDR_cs_n,DDR_dm,DDR_dq,DDR_dqs_n,DDR_dqs_p,DDR_odt,DDR_ras_n,DDR_reset_n,DDR_we_n,FIXED_IO_ddr_vrn,FIXED_IO_ddr_vrp,FIXED_IO_mio,FIXED_IO_ps_clk,FIXED_IO_ps_porb,FIXED_IO_ps_srstb,iic_0_scl_io,iic_0_sda_io);inout [14:0]DDR_addr;inout [2:0]DDR_ba;inout DDR_cas_n;inout DDR_ck_n;inout DDR_ck_p;inout DDR_cke;inout DDR_cs_n;inout [3:0]DDR_dm;inout [31:0]DDR_dq;inout [3:0]DDR_dqs_n;inout [3:0]DDR_dqs_p;inout DDR_odt;inout DDR_ras_n;inout DDR_reset_n;inout DDR_we_n;inout FIXED_IO_ddr_vrn;inout FIXED_IO_ddr_vrp;inout [53:0]FIXED_IO_mio;inout FIXED_IO_ps_clk;inout FIXED_IO_ps_porb;inout FIXED_IO_ps_srstb;inout iic_0_scl_io;inout iic_0_sda_io;wire [14:0]DDR_addr;wire [2:0]DDR_ba;wire DDR_cas_n;wire DDR_ck_n;wire DDR_ck_p;wire DDR_cke;wire DDR_cs_n;wire [3:0]DDR_dm;wire [31:0]DDR_dq;wire [3:0]DDR_dqs_n;wire [3:0]DDR_dqs_p;wire DDR_odt;wire DDR_ras_n;wire DDR_reset_n;wire DDR_we_n;wire FIXED_IO_ddr_vrn;wire FIXED_IO_ddr_vrp;wire [53:0]FIXED_IO_mio;wire FIXED_IO_ps_clk;wire FIXED_IO_ps_porb;wire FIXED_IO_ps_srstb;wire iic_0_scl_i;wire iic_0_scl_io;wire iic_0_scl_o;wire iic_0_scl_t;wire iic_0_sda_i;wire iic_0_sda_io;wire iic_0_sda_o;wire iic_0_sda_t;design_1 design_1_i(.DDR_addr(DDR_addr),.DDR_ba(DDR_ba),.DDR_cas_n(DDR_cas_n),.DDR_ck_n(DDR_ck_n),.DDR_ck_p(DDR_ck_p),.DDR_cke(DDR_cke),.DDR_cs_n(DDR_cs_n),.DDR_dm(DDR_dm),.DDR_dq(DDR_dq),.DDR_dqs_n(DDR_dqs_n),.DDR_dqs_p(DDR_dqs_p),.DDR_odt(DDR_odt),.DDR_ras_n(DDR_ras_n),.DDR_reset_n(DDR_reset_n),.DDR_we_n(DDR_we_n),.FIXED_IO_ddr_vrn(FIXED_IO_ddr_vrn),.FIXED_IO_ddr_vrp(FIXED_IO_ddr_vrp),.FIXED_IO_mio(FIXED_IO_mio),.FIXED_IO_ps_clk(FIXED_IO_ps_clk),.FIXED_IO_ps_porb(FIXED_IO_ps_porb),.FIXED_IO_ps_srstb(FIXED_IO_ps_srstb),.IIC_0_scl_i(iic_0_scl_i),.IIC_0_scl_o(iic_0_scl_o),.IIC_0_scl_t(iic_0_scl_t),.IIC_0_sda_i(iic_0_sda_i),.IIC_0_sda_o(iic_0_sda_o),.IIC_0_sda_t(iic_0_sda_t));IOBUF iic_0_scl_iobuf(.I(iic_0_scl_o),.IO(iic_0_scl_io),.O(iic_0_scl_i),.T(iic_0_scl_t));IOBUF iic_0_sda_iobuf(.I(iic_0_sda_o),.IO(iic_0_sda_io),.O(iic_0_sda_i),.T(iic_0_sda_t));
endmodule
这个i2c工程的管脚是用emio引出的，所以要加这两个IOBUF,如果是mio引出的可以不加这两个IOBUF
IOBUF iic_0_scl_iobuf IOBUF iic_0_sda_iobufStep2 新建一个xdc文件
set_property PACKAGE_PIN B19 [get_ports iic_0_sda_io]
set_property PACKAGE_PIN A20 [get_ports iic_0_scl_io]
set_property IOSTANDARD LVCMOS33 [get_ports iic_0_scl_io]
set_property IOSTANDARD LVCMOS33 [get_ports iic_0_sda_io]set_property PULLUP true [get_ports iic_0_scl_io]
set_property PULLUP true [get_ports iic_0_sda_io]新建的工程因为是emio引出的所以要分配管脚，如果mio就不用分配引脚。
这个xdc文件主要注意下面这两行，这两行主要是加内部上拉电阻
set_property PULLUP true [get_ports iic_0_scl_io]
set_property PULLUP true [get_ports iic_0_sda_io]Step3 生成bit文件
Step4点击菜单栏上的 File->Export->Export Hardware 导出硬件配置文件
Step5 打开SDK，然后新建一个fsbl
点击Next
点击Finish
Step 6 新建一个hello_world模板工程
新建完成后如下图所示
下面是hello_world的主程序这里是写入16位起始地址0x00进行连续写和读
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******************************************************************************//** helloworld.c: simple test application** This application configures UART 16550 to baud rate 9600.* PS7 UART (Zynq) is not initialized by this application, since* bootrom/bsp configures it to baud rate 115200** ------------------------------------------------* | UART TYPE BAUD RATE |* ------------------------------------------------* uartns550 9600* uartlite Configurable only in HW design* ps7_uart 115200 (configured by bootrom/bsp)*/#include
#include "platform.h"
#include "xil_printf.h"#include "sleep.h"
#include "xiicps.h"XIicPs IicInstance; /* The instance of the IIC device. */#define IIC_DEVICE_ID XPAR_XIICPS_0_DEVICE_IDu8 WriteBuffer[2 + 1];u8 ReadBuffer[1]; /* Read buffer for reading a page. */struct sensor_register {u8 value;
};static const struct sensor_register i2c_data[] = {{ 0x00},{ 0x00},{ 0x04},{ 0x01},{ 0x11},{ 0x02},{ 0x3a},{ 0x70},{ 0x17},{ 0x98},{ 0x08},{ 0x65},{ 0x04},{ 0x70},{ 0x01},{ 0xff},/* over */
};int iic_master_init(void)
{int Status;XIicPs_Config *ConfigPtr; /* Pointer to configuration data */ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);if (ConfigPtr == NULL) {return XST_FAILURE;}Status = XIicPs_CfgInitialize(&IicInstance, ConfigPtr,ConfigPtr->BaseAddress);if (Status != XST_SUCCESS) {return XST_FAILURE;}XIicPs_SetSClk(&IicInstance, 400000);return XST_SUCCESS;
}int iic_write_read_8(u8 Device_Address,u8 First_Word_Address,u8 Second_Word_address,u8 data)
{int Status;WriteBuffer[0] = First_Word_Address;WriteBuffer[1] = Second_Word_address;WriteBuffer[2] = data;Status = XIicPs_MasterSendPolled(&IicInstance, WriteBuffer,3, Device_Address>>1);if (Status != XST_SUCCESS) {return XST_FAILURE;}while (XIicPs_BusIsBusy(&IicInstance));usleep(2500);if (Status != XST_SUCCESS) {return XST_FAILURE;}WriteBuffer[0] = First_Word_Address;WriteBuffer[1] = Second_Word_address;Status = XIicPs_MasterSendPolled(&IicInstance, WriteBuffer,2, Device_Address>>1);if (Status != XST_SUCCESS) {return XST_FAILURE;}while (XIicPs_BusIsBusy(&IicInstance));usleep(2500);Status = XIicPs_MasterRecvPolled(&IicInstance, ReadBuffer,1, Device_Address>>1);if (Status != XST_SUCCESS) {return XST_FAILURE;}while (XIicPs_BusIsBusy(&IicInstance));xil_printf("0x%02x\r\n",ReadBuffer[0]);return 0;
}int main(void)
{int i;u8 Device_Address;u8 First_Word_Address;u8 Second_Word_address;Device_Address = 0xAE;First_Word_Address = 0x00;Second_Word_address = 0x00;i = 0;iic_master_init();while(1)
{if(i2c_data[i].value==0xff)break;iic_write_read_8(Device_Address,First_Word_Address,Second_Word_address,i2c_data[i].value);i++;
}return 0;
} 这两个i2c的读写程序都比较简单，这里只是简单的介绍下要注意的地方
这个主要是对master控制器进行初始化
iic_master_init();初始化中主要主要注意：
ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);其中这个i2c的设备ID主要是看你用zynq哪个设备，一般都是用的i2c0、i2c1
XPAR_XIICPS_0_DEVICE_ID //对应i2c0
XPAR_XIICPS_1_DEVICE_ID //对应i2c1
下面的这段代码主要设置i2c的工作频率，我这里用的是400k
XIicPs_SetSClk(&IicInstance, 400000);初始化完成后主要就是进行读写了，在读写之前要将进行的读写的数据进行缓冲，所以会用到Buffer
这个24c32的地址是16位，数据是8位，所以一共要用到3个Buffer进行缓冲
WriteBuffer[0] = First_Word_Address;WriteBuffer[1] = Second_Word_address;WriteBuffer[2] = data;上面的是写的3个缓冲Buffer，这个是读的缓冲Buffer只有一个
ReadBuffer[0]缓冲Buffer做完后就开始进行写，这里进行写的函数只要设置缓冲Buffer的个数以及所接的24C32的设备地址就可以了
Status = XIicPs_MasterSendPolled(&IicInstance, WriteBuffer,3, Device_Address>>1);当数据写完成后开始进行读，读分为两步：第一步写入你所要读的地址、第二步读这个地址里的数据
1. Status = XIicPs_MasterSendPolled(&IicInstance, WriteBuffer,2, Device_Address>>1);2. Status = XIicPs_MasterRecvPolled(&IicInstance, ReadBuffer,1, Device_Address>>1);这里是连续读写,所以开始写入16位的0x00的起始地址，然后对这个起始地址不断累加进行连续读
对特定地址进行读写和连续读写差不多，这里不再进行介绍
最后的这个是打印i2c读Buffer里的数据
xil_printf("0x%02x\r\n",ReadBuffer[0]);
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