我的RTOS 之六 -- Touch移植(s5pv210+threadx+ucgui+touch)

非常久没有关注RTOS了，所以也一直没有更新。近期闲了，把GPIO I2C调通了。简单移植了Touch。在S5PV210上使用。

调试I2C时。废了非常多周折，最后借助示波器才发现一个小小的错误。折腾了非常久非常久。

简要说下步骤：

1、首先I2C驱动，使用GPIO I2C的方式

#include

#include

#define DELAY  10

#define SDA 0

#define SCL 1

#define GPD1CON (*(volatile unsigned long *) 0xE02000C0)

#define GPD1DAT (*(volatile unsigned long *) 0xE02000C4)

#define GPD1PUD (*(volatile unsigned long *) 0xE02000C8)

#define GPD1DRV (*(volatile unsigned long *) 0xE02000CC)

#define SDA2_SET_INPUT (GPD1CON &= ~(0xf<<16))

#define SDA2_SET_OUTPUT (GPD1CON = (GPD1CON & (~(0x0f<<16))) | (0x1<<16))

#define SCL2_SET_INPUT (GPD1CON &= ~(0xf<<20));

#define SCL2_SET_OUTPUT (GPD1CON = (GPD1CON & (~(0x0f<<20))) | (0x1<<20))

#define SDA2_SET_VALUE(x) (GPD1DAT = (GPD1DAT & ~(1<<4)) | (x << 4))

#define SCL2_SET_VALUE(x) (GPD1DAT = (GPD1DAT & ~(1<<5)) | (x << 5))

#define SDA2_GET_VALUE ((GPD1DAT & (1<<4)) > 0 ? 1:0)

#define SCL2_GET_VALUE ((GPD1DAT & (1<<5)) > 0 ?

 1:0)

void gpio_i2c_init(void)

{

GPD1DRV = (GPD1DRV & ~(0x5 << 10) | (0x5 << 10));

GPD1PUD = (GPD1DRV & ~(0xf << 10) | 0xa << 10);

SCL2_SET_OUTPUT;

SDA2_SET_OUTPUT;

SDA2_SET_VALUE(1);

SCL2_SET_VALUE(1);

}

void i2c_start(void)

{   

SCL2_SET_OUTPUT;

SDA2_SET_OUTPUT;

SDA2_SET_VALUE(1);

SCL2_SET_VALUE(1);

udelay(DELAY);

SDA2_SET_VALUE(0);

udelay(DELAY);    

SCL2_SET_VALUE(0);

udelay(DELAY);

}

void i2c_stop(void)

{ 

SCL2_SET_OUTPUT;

SDA2_SET_OUTPUT;

SDA2_SET_VALUE(0);

SCL2_SET_VALUE(0);

udelay(DELAY);

SCL2_SET_VALUE(1);

udelay(DELAY);

SDA2_SET_VALUE(1);

udelay(DELAY);

}

void i2c_send_ack(unsigned char ack)

{

SCL2_SET_OUTPUT;

SDA2_SET_OUTPUT;

if(ack)

SDA2_SET_VALUE(1); 

else 

SDA2_SET_VALUE(0); 

udelay(DELAY);

SCL2_SET_VALUE(1);

    udelay(DELAY);

SCL2_SET_VALUE(0);

udelay(DELAY);

}

char i2c_receive_ack(void)

{

char rc = 0;

SCL2_SET_OUTPUT;

SDA2_SET_INPUT;

SCL2_SET_VALUE(1);

udelay(DELAY);

if(SDA2_GET_VALUE) {

rc = 1;

}

SCL2_SET_VALUE(0);

SDA2_SET_OUTPUT;

SDA2_SET_VALUE(1);

return rc;

}

unsigned char i2c_send_byte(unsigned char send_byte)

{

unsigned char rc = 0;

unsigned char out_mask = 0x80;

unsigned char value;

unsigned char count = 8;

SDA2_SET_OUTPUT;

SCL2_SET_OUTPUT;

while(count > 0) {                

value = ((send_byte & out_mask) ?

 1 : 0);   

if (value == 1) {         

SDA2_SET_VALUE(1);     

}    

else {           

SDA2_SET_VALUE(0);     

}    

udelay(DELAY);

SCL2_SET_VALUE(1);        

udelay(DELAY);

SCL2_SET_VALUE(0);   

udelay(DELAY);

out_mask >>= 1;      

count--;       

}

SDA2_SET_VALUE(1);     

rc = i2c_receive_ack();

return rc;

}

void i2c_read_byte(unsigned char *buffer, unsigned char ack)

{

unsigned char count = 0x08;

unsigned char data = 0x00;

unsigned char temp = 0;

SDA2_SET_INPUT; 

SCL2_SET_OUTPUT;

while(count > 0) {

SCL2_SET_VALUE(1);

udelay(DELAY);

temp = SDA2_GET_VALUE;   

data <<= 1;

if (temp)

data |= 0x01;

SCL2_SET_VALUE(0);

udelay(DELAY);

count--;

    }

i2c_send_ack(ack);//0 = ACK    1 = NACK

*buffer = data;

}

int gpio_i2c_master_send(unsigned int SlaveAddr, unsigned char *Data, unsigned int length)

{

unsigned int i, j;

int rc;

SlaveAddr = (SlaveAddr << 1) & ~0x01;

i2c_start();

rc = i2c_send_byte(SlaveAddr);

if(rc){

printf('i2c_send_byte no ack 1n');

return -1;

}

for(j = 0; j < length; j++) {

rc = i2c_send_byte(Data[j]);//发送data

if(rc){

printf('i2c_send_byte no ack 2n');

return -1;

}

}

i2c_stop();//停止信号

udelay(10);

return 0;

}

int gpio_i2c_master_recv(unsigned int SlaveAddr, unsigned char *Data, unsigned int length)

{

unsigned int i, j;

unsigned int data;

int rc;

SlaveAddr = (SlaveAddr << 1) | 0x01;

i2c_start();

rc = i2c_send_byte(SlaveAddr);

if(rc) {

printf('i2c_read_byte no ack 1n');

return -1;

}

for(j=0; j i2c_read_byte(Data++, !(length - j -1));//读取数据;

}

i2c_stop();//停止信号

return length;

}

int i2c_read_data(unsigned int SlaveAddr, 

char *reg, unsigned char *values, int length)

{

int ret;

int count = 0;

retry:

/* select register*/

ret = gpio_i2c_master_send(SlaveAddr, reg , 1);

if (ret < 0) {

udelay(DELAY * 2);

if (++count < 2)

goto retry;

return ret;

}

/* for setup tx transaction. */

udelay(DELAY);

ret = gpio_i2c_master_recv(SlaveAddr,  values , length);

if (ret < 0)

return ret;

udelay(DELAY);

return length;

}

2、Touch驱动

Touch IC为 FT5406, slave地址为0x70.

借助博友的一页芯片资料，写了最简单的单点读取：

多点也非常easy。能够參考android 多点触控协议上报点

#include 
#include 

struct touch_data touch_data;

int touch_irq()
{
	int i;
	int num = 0;
	int x, y;
	char reg[1] = {0};
	unsigned char buf[10];
	
	i2c_read_data(0x38, reg, buf, 7);

	if((num = (buf[2] & 0x0f)) == 0)
	{
		if(touch_data.isPress)
		{
			touch_data.isPress = 0;
			touch_data.x = -1;
			touch_data.y = -1;
			touch_event(touch_data.x, touch_data.y);
		}
		//printf('releasern');
		return 0;
	}
	x = (buf[3]&0x0f) << 8 | buf[4];
	y = (buf[5]&0x0f) << 8 | buf[6];
	//printf('num:%d, x:%d, y:%drn', num, x, y);
	touch_data.x		= x;
	touch_data.y		= y;
	if(touch_data.isPress  == 0)
		touch_data.isPress  = 1;
	touch_event(touch_data.x, touch_data.y);
	return 0;
}

void touch_init(void)
{
	unsigned char uc_reg_value;
	unsigned char uc_reg_addr;
	unsigned char buf[1];
	unsigned char dst[1];

	touch_int_setup();
	
	i2c_read_data(0x38, buf, dst, 1);
	printf('touch fw:0x%xrn', dst[0]);
	buf[0] = 0x88;
	i2c_read_data(0x38, buf, dst, 1);
	printf('report rate:0x%xrn', dst[0] * 10);
	buf[0] = 0x80;
	i2c_read_data(0x38, buf, dst, 1);
	printf('touch threshold:0x%xrn', dst[0] * 4);

	intc_enable(NUM_EINT14);
}

在touch_init 初始化中可以取到touch固件信息。就说明i2c通信正常了。

3、看下效果^^

最后两张的动画比較卡。

4:、存在问题及缺点

因为是电容屏，中断出发，触摸的时候。会不停的上报中断，会导致其它线程block。发生卡顿的情况，尤其画面比較复杂的时候。后期能够採取查询的方法，放在单独的线程其中或者减少touch的报点率；

另外就是lcd仅仅有一层framebuffer，多层显示倒是ucgui的效率低下，后期优化能够同一时候打开至少两个framebuffer。

5、源代码

http://download.csdn.net/detail/liujia2100/8859911

后期尝试移植lwip，搭配arduino。物联网^^.