20_I.MX6ULL_多点电容触摸ICgt9147实验
多点电容触摸简介
触摸屏很早就有了,一开始是电阻触摸屏,电阻触摸屏只能单点触摸,在以前的学习机、功能机时代被广泛使用。2007年1月9日苹果发布了划时代的第一代Iphone,也就是 Iphone2G, Iphone 2G上使用了多点电容触摸屏,而当时的手机基本都是使用的电阻触摸屏。电容触摸屏优秀的触摸品质和手感瞬间征服了消费者,带来了手机触摸屏的大变革,后面新出的手机也都采用了多点电容触摸屏。和电阻触摸屏相比,电容触摸屏最大的优点是支持多点触摸(后面的电阻屏也支持多点触摸,但是为时已晚,电容屏只需要手指轻触即可,而电阻屏是需要手指·给予一定的压力才有反应,而且电容屏不需要校准。如今多点电容触摸屏已经得到了广泛的应用,手机、平板、电脑、广告机等等,如果要做人机交互设备的开发,多点电容触摸屏基本是不可能绕过去的。
ATK-7016这款屏幕其实是由TFT LCD+触摸屏组合起来的。底下是LCD面板,上面是触摸面板,将两个封装到一起就成了带有触摸屏的LCD屏幕。电容触摸屏也是需要一个驱动IC的,驱动IC一般会提供一个I2C接口给主控制器,主控制器可以通过12C接口来读取驱动IC里面的触摸坐标数据。
实验源码
#ifndef _GT9147_H
#define _GT9147_H#include "imx6ul.h"
#include "bsp_gpio.h"/* 宏定义 */
#define GT9147_ADDR 0X14 /* GT9147设备地址 */#define GT_CTRL_REG 0X8040 /* GT9147控制寄存器 */
#define GT_MODSW_REG 0X804D /* GT9147模式切换寄存器 */
#define GT_CFGS_REG 0X8047 /* GT9147配置起始地址寄存器 */
#define GT1151_CFGS_REG 0X8050 /* GT1151配置起始地址寄存器 */
#define GT_CHECK_REG 0X80FF /* GT9147校验和寄存器 */
#define GT_PID_REG 0X8140 /* GT9147产品ID寄存器 */#define GT_GSTID_REG 0X814E /* GT9147当前检测到的触摸情况 */
#define GT_TP1_REG 0X8150 /* 第一个触摸点数据地址 */
#define GT_TP2_REG 0X8158 /* 第二个触摸点数据地址 */
#define GT_TP3_REG 0X8160 /* 第三个触摸点数据地址 */
#define GT_TP4_REG 0X8168 /* 第四个触摸点数据地址 */
#define GT_TP5_REG 0X8170 /* 第五个触摸点数据地址 */#define GT9147_XYCOORDREG_NUM 30 /* 触摸点坐标寄存器数量 */
#define GT9147_INIT_FINISHED 1 /* 触摸屏初始化完成 */
#define GT9147_INIT_NOTFINISHED 0 /* 触摸屏初始化未完成 *//* 触摸屏结构体 */
struct gt9147_dev_struc
{ unsigned char initfalg; /* 触摸屏初始化状态 */unsigned char intflag; /* 标记中断有没有发生 */unsigned char point_num; /* 触摸点 */unsigned short x[5]; /* X轴坐标 */ unsigned short y[5]; /* Y轴坐标 */
};extern struct gt9147_dev_struc gt9147_dev;
extern int gt_init_fail;/* 函数声明 */
void gt9147_init(void);void gt9147_irqhandler(void);
unsigned char gt9147_write_byte(unsigned char addr,unsigned int reg, unsigned char data);
unsigned char gt9147_read_byte(unsigned char addr,unsigned int reg);
void gt9147_read_len(unsigned char addr,unsigned int reg,unsigned int len,unsigned char *buf);
void gt9147_write_len(unsigned char addr,unsigned int reg,unsigned int len,unsigned char *buf);
void gt9147_read_tpnum(void);
void gt9147_read_tpcoord(void);
void gt9147_send_cfg(unsigned char mode);
void gt9147_read_tpcoord(void);#endif
#include "bsp_gt9147.h"
#include "bsp_i2c.h"
#include "bsp_interrupt.h"
#include "bsp_delay.h"
#include "stdio.h"/** GT9147配置参数表* 第一个字节为版本号(0X61),必须保证新的版本号大于等于GT9147内部* flash原有版本号,才会更新配置.*/
u8 GT9147_CFG_TBL[]=
{ 0x41,0xe0,0x01,0x10,0x01,0x05,0x0d,0x00,0x01,0x08,0x28,0x05,0x50,0x32,0x03,0x05,0x00,0x00,0xff,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x89,0x28,0x0a,0x17,0x15,0x31,0x0d,0x00,0x00,0x02,0x9b,0x03,0x25,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x32,0x00,0x00,0x00,0x0f,0x94,0x94,0xc5,0x02,0x07,0x00,0x00,0x04,0x8d,0x13,0x00,0x5c,0x1e,0x00,0x3c,0x30,0x00,0x29,0x4c,0x00,0x1e,0x78,0x00,0x1e,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x0a,0x0c,0x0e,0x10,0x12,0x14,0x16,0x18,0x1a,0x00,0x00,0x00,0x00,0x1f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x00,0x02,0x04,0x05,0x06,0x08,0x0a,0x0c,0x0e,0x1d,0x1e,0x1f,0x20,0x22,0x24,0x28,0x29,0xff,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
};struct gt9147_dev_struc gt9147_dev;
int gt_init_fail = 0;/** @description : 初始化触摸屏，其实就是初始化GT9147* @param : 无* @return : 无*/
void gt9147_init(void)
{unsigned char temp[7]; gpio_pin_config_t ctintpin_config;gpio_pin_config_t ctretpin_config;gt9147_dev.initfalg = GT9147_INIT_NOTFINISHED;int i;for( i = 0; i < 5; i++ ){ /* 避免编译器自动赋值 */gt9147_dev.x[i] = 0;gt9147_dev.y[i] = 0;}gt9147_dev.point_num = 0;/* 1、初始化IIC2 IO* I2C2_SCL -> UART5_TXD* I2C2_SDA -> UART5_RXD*/IOMUXC_SetPinMux(IOMUXC_UART5_TX_DATA_I2C2_SCL,1);IOMUXC_SetPinMux(IOMUXC_UART5_RX_DATA_I2C2_SDA,1);/* 配置I2C2 IO属性 *bit 16:0 HYS关闭*bit [15:14]: 1 默认47K上拉*bit [13]: 1 pull功能*bit [12]: 1 pull/keeper使能 *bit [11]: 0 关闭开路输出*bit [7:6]: 10 速度100Mhz*bit [5:3]: 110 驱动能力为R0/6*bit [0]: 1 高转换率*/IOMUXC_SetPinConfig(IOMUXC_UART5_TX_DATA_I2C2_SCL, 0x70B0);IOMUXC_SetPinConfig(IOMUXC_UART5_RX_DATA_I2C2_SDA, 0X70B0);/* 2、初始化触摸屏中断IO和复位IO */IOMUXC_SetPinMux(IOMUXC_GPIO1_IO09_GPIO1_IO09,0); /* 复用为GPIO1_IO9 */IOMUXC_SetPinMux(IOMUXC_SNVS_SNVS_TAMPER9_GPIO5_IO09,0);/* 复用为GPIO5_IO9 */IOMUXC_SetPinConfig(IOMUXC_GPIO1_IO09_GPIO1_IO09,0x10B0);IOMUXC_SetPinConfig(IOMUXC_SNVS_SNVS_TAMPER9_GPIO5_IO09,0X10B0);/* 中断IO初始化 */ctintpin_config.direction = kGPIO_DigitalOutput;ctintpin_config.outputLogic = 1;ctintpin_config.interruptMode = kGPIO_NoIntmode;gpio_init(GPIO1, 9, &ctintpin_config);/* 复位IO初始化 */ctretpin_config.direction = kGPIO_DigitalOutput; ctretpin_config.interruptMode = kGPIO_NoIntmode; ctretpin_config.outputLogic = 1; gpio_init(GPIO5, 9, &ctretpin_config); /* 3、初始化I2C */i2c_init(I2C2); /* 4、初始化GT9147，要严格按照GT9147时序要求 */gpio_pinwrite(GPIO5, 9, 0); /* 复位GT9147 */delay_ms(10);gpio_pinwrite(GPIO5, 9, 1); /* 停止复位GT9147 */ delay_ms(10);gpio_pinwrite(GPIO1, 9, 0); /* 拉低INT引脚 */delay_ms(100);gt9147_read_len(GT9147_ADDR, GT_PID_REG, 6, temp);/* 读取产品ID */temp[6] = temp[4];temp[4] = 0;printf("CTP ID:%s\\r\\n", temp); /* 打印ID */printf("Default Ver:%#x\\r\\n",((temp[5]<<8) | temp[6])); /* 打印固件版本 *//* 重新设置中断IO，配置为中断功能 */IOMUXC_SetPinConfig(IOMUXC_GPIO1_IO09_GPIO1_IO09,0x0080);ctintpin_config.direction = kGPIO_DigitalInput;ctintpin_config.outputLogic=0;if(temp[0] != 0x31){temp[0]=gt9147_read_byte(GT9147_ADDR, 0x804D) & 0x3; /* 获取中断模式 */printf("9xx\\r\\n");} else temp[0]=gt9147_read_byte(GT9147_ADDR, 0x8056) & 0x3;switch(temp[0]) {case 0x0:printf("InterruptMode:IntRisingEdge\\r\\n");ctintpin_config.interruptMode = kGPIO_IntRisingEdge;break;case 0x1:printf("InterruptMode:IntFallingEdge\\r\\n");ctintpin_config.interruptMode = kGPIO_IntFallingEdge;break;case 0x2:printf("InterruptMode:IntLowLevel\\r\\n");ctintpin_config.interruptMode = kGPIO_IntLowLevel;break;case 0x3:printf("InterruptMode:IntHighLevel\\r\\n");ctintpin_config.interruptMode = kGPIO_IntHighLevel;break;default : printf("InterruptMode: Error\\r\\n");ctintpin_config.interruptMode = kGPIO_IntRisingOrFallingEdge;break;}gpio_init(GPIO1, 9, &ctintpin_config);if(gt9147_write_byte(GT9147_ADDR, GT_CTRL_REG, 0x02)){gt_init_fail = 1; //gt系列初始化失败goto done;}delay_ms(10);gt9147_write_byte(GT9147_ADDR, GT_CTRL_REG, 0); GIC_EnableIRQ(GPIO1_Combined_0_15_IRQn); /* 使能GIC中对应的中断 */system_register_irqhandler(GPIO1_Combined_0_15_IRQn, (system_irq_handler_t)gt9147_irqhandler, NULL); /* 注册中断服务函数 */gpio_enableint(GPIO1, 9); /* 使能GPIO1_IO09的中断功能 */delay_ms(100);gt9147_dev.initfalg = GT9147_INIT_FINISHED; /* 标记GT9147初始化完成 */gt9147_dev.intflag = 0;
done:delay_ms(10);
}/** @description : GPIO1_IO9最终的中断处理函数* @param : 无* @return : 无*/
void gt9147_irqhandler(void)
{ if(gt9147_dev.initfalg == GT9147_INIT_FINISHED){gt9147_dev.intflag = 1;//gt9147_write_byte(GT9147_ADDR, GT_GSTID_REG, 0); gt9147_read_tpcoord();}gpio_clearintflags(GPIO1, 9); /* 清除中断标志位 */
}/** @description : 向GT9147写入数据* @param - addr: 设备地址* @param - reg : 要写入的寄存器* @param - data: 要写入的数据* @return : 操作结果*/
unsigned char gt9147_write_byte(unsigned char addr,unsigned int reg, unsigned char data)
{unsigned char status=0;unsigned char writedata=data;struct i2c_transfer masterXfer;/* 配置I2C xfer结构体 */masterXfer.slaveAddress = addr; /* 设备地址 */masterXfer.direction = kI2C_Write; /* 写入数据 */masterXfer.subaddress = reg; /* 要写入的寄存器地址 */masterXfer.subaddressSize = 2; /* 地址长度一个字节 */masterXfer.data = &writedata; /* 要写入的数据 */masterXfer.dataSize = 1; /* 写入数据长度1个字节 */if(i2c_master_transfer(I2C2, &masterXfer))status=1;return status;
}/** @description : 从GT9147读取一个字节的数据* @param - addr: 设备地址* @param - reg : 要读取的寄存器* @return : 读取到的数据。*/
unsigned char gt9147_read_byte(unsigned char addr,unsigned int reg)
{unsigned char val=0;struct i2c_transfer masterXfer; masterXfer.slaveAddress = addr; /* 设备地址 */masterXfer.direction = kI2C_Read; /* 读取数据 */masterXfer.subaddress = reg; /* 要读取的寄存器地址 */masterXfer.subaddressSize = 2; /* 地址长度一个字节 */masterXfer.data = &val; /* 接收数据缓冲区 */masterXfer.dataSize = 1; /* 读取数据长度1个字节 */i2c_master_transfer(I2C2, &masterXfer);return val;
}/** @description : 从GT9147读取多个字节的数据* @param - addr: 设备地址* @param - reg : 要读取的开始寄存器地址* @param - len : 要读取的数据长度.* @param - buf : 读取到的数据缓冲区* @return : 无*/
void gt9147_read_len(unsigned char addr,unsigned int reg,unsigned int len,unsigned char *buf)
{ struct i2c_transfer masterXfer; masterXfer.slaveAddress = addr; /* 设备地址 */masterXfer.direction = kI2C_Read; /* 读取数据 */masterXfer.subaddress = reg; /* 要读取的寄存器地址 */masterXfer.subaddressSize = 2; /* 地址长度一个字节 */masterXfer.data = buf; /* 接收数据缓冲区 */masterXfer.dataSize = len; /* 读取数据长度1个字节 */i2c_master_transfer(I2C2, &masterXfer);
} /** @description : 向GT9147多个寄存器写入数据* @param - addr: 设备地址* @param - reg : 要写入的开始寄存器地址* @param - len : 要写入的数据长度.* @param - buf : 写入到的数据缓冲区* @return : 无*/
void gt9147_write_len(unsigned char addr,unsigned int reg,unsigned int len, unsigned char *buf)
{ struct i2c_transfer masterXfer; masterXfer.slaveAddress = addr; /* 设备地址 */masterXfer.direction = kI2C_Write; /* 读取数据 */masterXfer.subaddress = reg; /* 要读取的寄存器地址 */masterXfer.subaddressSize = 2; /* 地址长度一个字节 */masterXfer.data = buf; /* 接收数据缓冲区 */masterXfer.dataSize = len; /* 读取数据长度1个字节 */i2c_master_transfer(I2C2, &masterXfer);
} /** @description : 发送GT9147配置参数* @param - mode: 0,参数不保存到flash* 1,参数保存到flash* @return : 无*/
void gt9147_send_cfg(unsigned char mode)
{unsigned char buf[2];unsigned int i = 0;buf[0] = 0;buf[1] = mode; /* 是否写入到GT9147 FLASH? 即是否掉电保存 */for(i = 0; i < (sizeof(GT9147_CFG_TBL)); i++) /* 计算校验和 */buf[0] += GT9147_CFG_TBL[i]; buf[0] = (~buf[0]) + 1;/* 发送寄存器配置 */gt9147_write_len(GT9147_ADDR, GT_CFGS_REG, sizeof(GT9147_CFG_TBL), GT9147_CFG_TBL);gt9147_write_len(GT9147_ADDR, GT_CHECK_REG, 2, buf);/* 写入校验和,配置更新标记 */
} const u16 GT9147_TPX_TBL[5]={GT_TP1_REG,GT_TP2_REG,GT_TP3_REG,GT_TP4_REG,GT_TP5_REG};
/** @description : 读取当前所有触摸点的坐标* @param : 无* @return : 无*/
void gt9147_read_tpcoord(void)
{u8 buf[4];u8 i = 0;u8 regvalue = 0;regvalue = gt9147_read_byte(GT9147_ADDR, GT_GSTID_REG);gt9147_write_byte(GT9147_ADDR, GT_GSTID_REG, 0x00);gt9147_dev.point_num = regvalue & 0XF; /* 计算读取了多少个点 *//* 读取当前所有的触摸坐标值 */for(i = 0; i < gt9147_dev.point_num; i++){gt9147_read_len(GT9147_ADDR, GT9147_TPX_TBL[i], 4, buf); /* 读取坐标值 */gt9147_dev.x[i] = ((u16)buf[1] << 8) + buf[0];gt9147_dev.y[i] = (((u16)buf[3] << 8) + buf[2]); }
}#include "bsp_clk.h"#include "bsp_delay.h"#include "bsp_led.h"#include "bsp_beep.h"#include "bsp_key.h"#include "bsp_interrupt.h"#include "bsp_uart.h"#include "bsp_lcd.h"#include "bsp_lcdapi.h"#include "bsp_rtc.h"#include "bsp_gt9147.h"#include "stdio.h"/** @description : 使能I.MX6U的硬件NEON和FPU* @param : 无* @return : 无*/void imx6ul_hardfpu_enable(void){uint32_t cpacr;uint32_t fpexc;/* 使能NEON和FPU */cpacr = __get_CPACR();cpacr = (cpacr & ~(CPACR_ASEDIS_Msk | CPACR_D32DIS_Msk))| (3UL << CPACR_cp10_Pos) | (3UL << CPACR_cp11_Pos);__set_CPACR(cpacr);fpexc = __get_FPEXC();fpexc |= 0x40000000UL; __set_FPEXC(fpexc);}/** @description : main函数* @param : 无* @return : 无*/int main(void){unsigned char i = 0;unsigned char state = OFF;imx6ul_hardfpu_enable(); /* 使能I.MX6U的硬件浮点 */int_init(); /* 初始化中断(一定要最先调用！) */imx6u_clkinit(); /* 初始化系统时钟 */delay_init(); /* 初始化延时 */clk_enable(); /* 使能所有的时钟 */led_init(); /* 初始化led */beep_init(); /* 初始化beep */uart_init(); /* 初始化串口，波特率115200 */lcd_init(); /* 初始化LCD */ /* 初始化触摸屏 */ gt9147_init();tftlcd_dev.forecolor = LCD_RED;lcd_show_string(50, 10, 400, 24, 24, (char*)"IMX6U-ALPHA TOUCH SCREEN TEST"); lcd_show_string(50, 40, 200, 16, 16, (char*)"TOUCH SCREEN TEST"); lcd_show_string(50, 60, 200, 16, 16, (char*)"ATOM@ALIENTEK"); lcd_show_string(50, 80, 200, 16, 16, (char*)"2019/3/27"); lcd_show_string(50, 110, 400, 16, 16, (char*)"TP Num :"); lcd_show_string(50, 130, 200, 16, 16, (char*)"Point0 X:"); lcd_show_string(50, 150, 200, 16, 16, (char*)"Point0 Y:"); lcd_show_string(50, 170, 200, 16, 16, (char*)"Point1 X:"); lcd_show_string(50, 190, 200, 16, 16, (char*)"Point1 Y:"); lcd_show_string(50, 210, 200, 16, 16, (char*)"Point2 X:"); lcd_show_string(50, 230, 200, 16, 16, (char*)"Point2 Y:"); lcd_show_string(50, 250, 200, 16, 16, (char*)"Point3 X:"); lcd_show_string(50, 270, 200, 16, 16, (char*)"Point3 Y:"); lcd_show_string(50, 290, 200, 16, 16, (char*)"Point4 X:"); lcd_show_string(50, 310, 200, 16, 16, (char*)"Point4 Y:"); tftlcd_dev.forecolor = LCD_BLUE;while(1) {lcd_shownum(50 + 72, 110, gt9147_dev.point_num , 1, 16);lcd_shownum(50 + 72, 130, gt9147_dev.x[0], 5, 16);lcd_shownum(50 + 72, 150, gt9147_dev.y[0], 5, 16);lcd_shownum(50 + 72, 170, gt9147_dev.x[1], 5, 16);lcd_shownum(50 + 72, 190, gt9147_dev.y[1], 5, 16);lcd_shownum(50 + 72, 210, gt9147_dev.x[2], 5, 16);lcd_shownum(50 + 72, 230, gt9147_dev.y[2], 5, 16);lcd_shownum(50 + 72, 250, gt9147_dev.x[3], 5, 16);lcd_shownum(50 + 72, 270, gt9147_dev.y[3], 5, 16);lcd_shownum(50 + 72, 290, gt9147_dev.x[4], 5, 16);lcd_shownum(50 + 72, 310, gt9147_dev.y[4], 5, 16);delay_ms(10);i++;if(i == 50){ i = 0;state = !state;led_switch(LED0,state); }}return 0;}