331 lines
8.8 KiB
C++
331 lines
8.8 KiB
C++
#include <iostream>
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#include <iomanip>
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#include <memory>
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#include <thread>
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#include <chrono>
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#include <functional>
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#include <fcntl.h>
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#include <poll.h>
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#include <unistd.h>
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#define I2C_SDA 43 // GPIO1_B3
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#define I2C_SCL 44 // GPIO1_B4
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#define I2C_INT 52
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typedef unsigned char UINT8;
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typedef unsigned short UINT16;
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#define STATUS_SUCCESS 0
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#define STATUS_FAILURE -1
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#define CH455_GET_KEY 0x0700 // 获取按键,返回按键代码
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#define CH455_SYSOFF 0x0400 // 关闭显示、关闭键盘
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#define CH455_I2C_ADDR 0x40 // CH455的地址
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#define CH455_I2C_MASK 0x3E // CH455的高字节命令掩码
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#define CH455_BIT_ENABLE 0x01
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// #define CH455_BIT_ENABLE 0x03 // 开启/关闭位
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#define CH455_BIT_SLEEP 0x04 // 睡眠控制位
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#define CH455_SYSON (CH455_SYSOFF | CH455_BIT_ENABLE)
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#define CH455_SLEEPOFF CH455_SYSOFF // 关闭睡眠
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#define CH455_SLEEPON (CH455_SYSOFF | CH455_BIT_SLEEP) // 开启睡眠
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static unsigned char TxBuf[24] = {0};
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static unsigned char RxBuf[24] = {0};
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void CH455_I2c_Stop(void);
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void CH455_I2C_WrByte(unsigned char IIC_Byte);
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void delay_us(int i)
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{
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int j, k;
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for (j = 0; j < i; j++)
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for (k = 0; k < 10; k++)
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;
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}
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void initGpio(int addr)
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{
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// printf("开始创建GPIO%d节点\n", addr);
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FILE *fp = fopen("/sys/class/gpio/export", "w");
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if (fp == NULL)
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perror("export open filed");
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else
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fprintf(fp, "%d", addr);
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fclose(fp);
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// printf("结束创建GPIO%d节点\n", addr);
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}
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// 设置为gpio方向
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void setGpioDirection(int addr, char *direction)
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{
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// printf("设置第GPIO%d为out模式\n",addr);
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char path[100] = {0};
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sprintf(path, "/sys/class/gpio/gpio%d/direction", addr);
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FILE *fp = fopen(path, "w");
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if (fp == NULL)
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perror("direction open filed");
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else
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fprintf(fp, "%s", direction);
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fclose(fp);
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// printf("结束设置第GPIO%d为out模式\n",addr);
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}
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// 设置gpio的电平
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void set_gpioValue(int addr, int value)
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{
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// printf("设置GPIO%d为%d\n", addr, value);
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char path[64];
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snprintf(path, sizeof(path), "/sys/class/gpio/gpio%d/value", addr);
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FILE *fp = fopen(path, "w");
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if (fp == NULL)
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perror("direction open filed");
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else
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fprintf(fp, "%d", value);
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fclose(fp);
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// printf("结束设置GPIO%d位置为%d\n", addr, value);
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}
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void IOWR_OUT(int addr, int val)
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{
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initGpio(addr);
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setGpioDirection(addr, "out");
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set_gpioValue(addr, val);
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}
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void IOWR_IN(int addr, int val)
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{
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initGpio(addr);
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setGpioDirection(addr, "in");
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set_gpioValue(addr, val);
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}
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// 读gpio节点状态
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int IORD(int addr)
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{
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char path[64];
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char value_str[3];
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snprintf(path, sizeof(path), "/sys/class/gpio/gpio%d/value", addr);
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// printf("/sys/class/gpio/gpio%d/value", addr);
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FILE *fp = fopen(path, "r");
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// fd = open(path, O_RDONLY);
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if (fp == NULL)
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{
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printf("Failed to open gpio value for reading!");
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return -1;
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}
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if (fread(value_str, sizeof(char), 3, fp) < 0)
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{
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perror("Failed to read value!");
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return -1;
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}
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fclose(fp);
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// printf("读取GPIO状态结束\n");
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return (atoi(value_str));
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}
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// 开始位
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void CH455_I2c_Start(void)
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{
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IOWR_OUT(I2C_SDA, 1);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 1);
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delay_us(5);
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IOWR_OUT(I2C_SDA, 0);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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}
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// 结束位
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void CH455_I2c_Stop(void)
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{
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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IOWR_OUT(I2C_SDA, 0);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 1);
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delay_us(5);
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IOWR_OUT(I2C_SDA, 1);
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delay_us(5);
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}
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// 主控端写入一个字节到从机
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void CH455_I2C_WrByte(unsigned char IIC_Byte)
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{
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unsigned char i;
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for (i = 0; i < 8; i++)
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{
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// IOWR(I2C_SCL, 0); //钳住I2C总线，准备发送数据
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if (IIC_Byte & 0x80)
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IOWR_OUT(I2C_SDA, 1);
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else
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IOWR_OUT(I2C_SDA, 0);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 1);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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IIC_Byte <<= 1;
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}
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delay_us(5);
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IOWR_OUT(I2C_SDA, 1);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 1);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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}
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// 主控端对从机读取一个字节
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static unsigned char CH455_I2C_RdByte(void) // 读取一个字节数据
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{
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unsigned char i = 0;
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unsigned char bytedata = 0;
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delay_us(5);
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// 将数据设置为输入模式
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IOWR_IN(I2C_SDA, 1);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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for (i = 0; i < 8; i++)
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{
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IOWR_OUT(I2C_SCL, 1);
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delay_us(5);
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bytedata <<= 1;
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delay_us(5);
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bytedata = bytedata | (IORD(I2C_SDA));
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delay_us(5);
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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}
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IOWR_OUT(I2C_SDA, 1); // 数据线设置回输出模式
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delay_us(5);
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IOWR_OUT(I2C_SCL, 1);
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delay_us(5);
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IOWR_OUT(I2C_SCL, 0);
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delay_us(5);
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return (bytedata); // 返回数据
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}
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// 写命令
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static unsigned char CH455_Write(UINT16 cmd)
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{
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printf("CH455_Write start...\n");
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CH455_I2c_Start(); // 启动总线
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printf("CH455_Write first byte= %02x\n", ((UINT8)(cmd >> 7) & CH455_I2C_MASK) | CH455_I2C_ADDR);
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printf("CH455_Write second byte= %02x\n", (UINT8)cmd);
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CH455_I2C_WrByte(((UINT8)(cmd >> 7) & CH455_I2C_MASK) | CH455_I2C_ADDR);
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CH455_I2C_WrByte((UINT8)cmd); // 发送数据
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CH455_I2c_Stop(); // 结束总线
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printf("CH455_Write end...\n");
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printf("\n");
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return 1;
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}
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static unsigned char CH455_Read(void) // 读取按键值
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{
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printf("CH455_Read start...\n");
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UINT8 keycode;
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CH455_I2c_Start(); // 启动总线
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printf("write byte= %02x\n", (UINT8)(CH455_GET_KEY >> 7) & CH455_I2C_MASK | 0x01 | CH455_I2C_ADDR);
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CH455_I2C_WrByte((UINT8)(CH455_GET_KEY >> 7) & CH455_I2C_MASK | 0x01 | CH455_I2C_ADDR);
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keycode = CH455_I2C_RdByte(); // 读取数据
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printf("read byte= %02x\n", keycode);
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CH455_I2c_Stop(); // 结束总线
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printf("CH455_Read end...\n");
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printf("\n");
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return keycode;
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}
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void key_Inter(void)
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{
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int ret;
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int val = 0;
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char buf[8];
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int num;
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UINT16 key_value;
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pollfd pfd;
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pfd.fd = -1;
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pfd.fd = open("/sys/class/gpio/gpio52/value", O_RDONLY);
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if (pfd.fd > 0)
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printf("huagao::open sucess,fd = %d\n", pfd.fd);
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else
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printf("huagao::open failed,fd = %d\n", pfd.fd);
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pfd.events = POLLPRI;
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num = read(pfd.fd, buf, 8); // This is to clear the avaible read
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for (int i = 0; i < 8; i++)
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printf("huagao::buf[%d] = %d\n", i, buf[i]);
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ret = CH455_Write(CH455_SYSON);
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printf("CH455_SYSON = %02x\n", (CH455_SYSON));
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printf("CH455_Read() = %02x\n", CH455_Read());
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key_value = 0xff;
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while (1)
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{
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ret = poll(&pfd, 1, 1000);
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if (ret > 0)
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{
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printf("--------------------------------------------\n");
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printf("huagao::poll get date.\n");
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printf("huagao::poll ret = %d\n", ret);
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/*
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POLLIN: 有普通数据或者优先数据可读
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POLLRDNORM: 有普通数据可读
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POLLRDBAND: 有优先数据可读
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POLLPRI: 有紧急数据可读
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POLLOUT: 有普通数据可写
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POLLWRNORM: 有普通数据可写
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POLLWRBAND: 有紧急数据可写
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POLLERR: 有错误发生
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POLLHUP: 有描述符挂起事件发生
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POLLNVAL: 描述符非法
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*/
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if (pfd.revents & POLLPRI)
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{
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lseek(pfd.fd, 0, SEEK_SET);
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num = read(pfd.fd, buf, 8);
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buf[num - 1] = '\0';
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ret = atoi(buf);
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for (int i = 0; i < 8; i++)
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printf("huagao::buf[%d] = %d\n", i, buf[i]);
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printf("huagao::atoi(buf) ret = %d\n", ret);
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}
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key_value = CH455_Read();
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printf("CH455_Read() = %02x\n", key_value);
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printf("--------------------------------------------\n");
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printf("\n");
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}
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else if (ret == 0)
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{
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printf("--------------------------------------------\n");
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printf("huagao::ret = %d\n", ret);
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printf("huagao::poll time out.\n");
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printf("--------------------------------------------\n");
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printf("\n");
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}
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else
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{
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printf("--------------------------------------------\n");
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printf("huagao::ret = %d\n", ret);
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printf("huagao::poll err.\n");
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printf("--------------------------------------------\n");
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printf("\n");
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}
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}
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}
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int main(void)
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{
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system("echo 52 > /sys/class/gpio/export");
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system("echo in > /sys/class/gpio/gpio52/direction");
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system("echo falling > /sys/class/gpio/gpio52/edge");
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key_Inter();
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return 0;
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}
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