大家好,又见面了,我是全栈君。
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 <stdio.h> #include <touch.h> #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 1\n"); 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 2\n"); 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 1\n"); return -1; } for(j=0; j<length; 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 <touch.h> #include <exception.h> 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("release\r\n"); return 0; } x = (buf[3]&0x0f) << 8 | buf[4]; y = (buf[5]&0x0f) << 8 | buf[6]; //printf("num:%d, x:%d, y:%d\r\n", 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%x\r\n", dst[0]); buf[0] = 0x88; i2c_read_data(0x38, buf, dst, 1); printf("report rate:0x%x\r\n", dst[0] * 10); buf[0] = 0x80; i2c_read_data(0x38, buf, dst, 1); printf("touch threshold:0x%x\r\n", 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^^.
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