MQ-T113使用xboot驱动GT911时中断无法使用

Ary_Ye LV 5

大佬们好，我使用xboot主线里的gt911驱动，发现无法使用触摸屏（在tina里面是可以用的），后来用逻辑分析仪发现rst和int的启动时序和tina里面的不一样，我猜测是启动时序出了问题，因为我也没自己写过gt911的驱动，麻烦各位大佬帮我看看启动时序有啥问题。

	gpio_set_cfg(rst, rstcfg);
	gpio_set_pull(rst, GPIO_PULL_UP);
	gpio_set_direction(rst, GPIO_DIRECTION_OUTPUT);

	gpio_set_value(rst, 0);
	mdelay(10);
	gpio_set_pull(gpio, GPIO_PULL_UP);
	gpio_set_direction(gpio, GPIO_DIRECTION_OUTPUT);
	gpio_set_value(gpio, 1);
	udelay(100);
	gpio_set_value(rst, 1);
	mdelay(5);

逻辑分析仪结果如下,触摸时没有变化

我改成了

		gpio_set_cfg(rst, rstcfg);
			
		gpio_set_direction(rst,GPIO_DIRECTION_OUTPUT);
		gpio_set_direction(gpio,GPIO_DIRECTION_OUTPUT);

		gpio_set_value(rst,0);
		gpio_set_value(gpio,1);
		udelay(200);

		gpio_set_value(rst,1);
		mdelay(6);

		gpio_set_value(gpio,0);
		mdelay(55);

		gpio_set_direction(gpio, GPIO_DIRECTION_INPUT);
		gpio_set_pull(gpio, GPIO_PULL_NONE);
		mdelay(50);

时序如下，感觉出现了异常，我尝试根据网上的程序修改，但是并没有驱动成功，求求大佬们看看是哪里出了问题。

司徒 LV 6

@ary_ye 這邊是愛搞機器的專區, 可以請問你這個是什麼遊戲機嗎？

Ary_Ye LV 5

@steward 不好意思，我这边是驱动出问题了，想问一下但是又不懂在哪个分区:(

司徒 LV 6

目前 XBOOT 有支援 GT-911 的平台如下：

./src/arch/riscv64/mach-f133/driver/ts-gt911.c
./src/arch/arm32/mach-t113s3jd/driver/ts-gt911.c
./src/arch/arm32/mach-t113s3/driver/ts-gt911.c
./src/arch/arm32/mach-z11s/driver/ts-gt911.c

手上剛好有 F133 板子, 但是我沒有 GT-911 觸控板, 如果需要或許可以用 Arduino 模擬～

不過, 找問題的方式應該大同小異, 因此, 我用 F133 說一下,
json 檔案確定有設定成 okay

"ts-f133@0x02009c00": {
        "clock-name": "link-tpadc",
        "interrupt": 78, 
        "reset": 1136,
        "median-filter-length": 5,
        "mean-filter-length": 5,
        "calibration": [168012, -57, -137136144, -344, 8674, -2840431, 65536],
        "status": "okay"
    },  

    "ts-gt911": {
        "i2c-bus": "i2c-f133.2",
        "slave-address": 20, 
        "interrupt-gpio": 35, 
        "interrupt-gpio-config": 14, 
        "reset-gpio": 34, 
        "reset-gpio-config": 1,
        "status": "okay"
    },

然後埋一些 LOG, 先確定觸控板有被正確配置

static bool_t gt911_initial(struct i2c_device_t * dev)
{
    u8_t cfg;
    u8_t id[4];
    u8_t ver[2];

    if(!gt911_read(dev, GT911_CONFIG_DATA, &cfg, 1)) {
        LOG("GT911: failed to read config data\n");
        return FALSE;
    }   
    if(!gt911_read(dev, GT911_PRODUCT_ID, &id[0], 4)) {
        LOG("GT911: failed to read product id\n");
        return FALSE;
    }   
    if(!gt911_read(dev, GT911_FIRMWARE_VERSION, &ver[0], 2)) {
        LOG("GT911: failed to read firmware version\n");
        return FALSE;
    }   

    LOG("GT911 Version: %c%c%c%c(0x%02x%02x)(0x%02x)", id[0], id[1], id[2], id[3], ver[1], ver[0], cfg);
    return gt911_send_cfg(dev, (u8_t *)gt911_config_data, ARRAY_SIZE(gt911_config_data));
}

埋好 LOG 之後, 下載測試

$ make CROSS_COMPILE=/opt/f133/bin/riscv64-unknown-linux-gnu- PLATFORM=riscv64-f133
$ xfel ddr f133 && xfel write 0x40000000 output/xboot.bin && xfel exec 0x40000000

因為沒有連接 GT-911, 因此, 在讀取 config data 時就會出錯

[    0.261738]GT911: failed to read config data

因此, 幾個找問題的方式提供給你參考 (跟著訊號的方向找問題就可以)

確定觸控的資訊可以被正確讀取到, 你應該可以從 UART 看到 "GT911 Version: xxx"
如果可以讀取到觸控資訊, 那可以往中斷腳位的方向找問題, 例如：沒接好或者被拉高拉低等問題

Ary_Ye LV 5

@steward 感谢大佬的回答:)，触控的信息是可以读取的，现在正打算用单片机发送这些数据看看能不能正常工作@_@

司徒 LV 6

@ary_ye 不過, 從你的圖片看來, 這個 I2C 訊號也不太像是 SCL, SDA 的訊號 ? 這樣你還可以從 xboot 拿到觸控的資料？

Ary_Ye LV 5

@steward 是RST和INT引脚的时序，我直接用XBOOT主线上的程序调不通，网络上有说这两个引脚的时序问题会影响GT911的启动，现在我主要是排查I2C通信的问题，发现读触摸数据寄存器也读不通还是在排查过程中，不过还是你的谢谢回答

司徒 LV 6

@Ary_Ye XBoot在T113-S3上的中斷設定確實有問題, 分析如下：

文章有點長，可以直接拉到底下看workaround方式

司徒終於從冰箱找到芒果派T113-S3開發板

司徒手上並沒有GT911觸控板，因此，司徒使用Arduino Micro模擬GT911訊號

Arduino腳位：

T113-S3腳位：

司徒將GT911 I2C訊號接到T113-S3 I2C-2，GT911的中斷則是接到T113-S3 PB6(手動觸發)

杜邦線連接

Arduino模擬GT911程式

#include <Wire.h>
 
unsigned short rx = 0;
void receiveEvent(int howMany) {
  if(howMany == 2){
    rx = Wire.read();
    rx<<= 8;
    rx|= Wire.read();
  }
  else{
    while (Wire.available()) {
      Wire.read();
    }
  }
  Serial.print("howMany:");
  Serial.print(howMany);
  Serial.print("\n");
  Serial.print("0x");
  Serial.print(rx, HEX);
  Serial.print("\n");
}
 
unsigned short x = 0;
unsigned short y = 0;
void requestEvent() {
  switch(rx){
  case 0x8047:
    Wire.write(byte(0x01));
    break;
  case 0x8140:
    Wire.write('A');
    Wire.write('B');
    Wire.write('C');
    Wire.write('D');
    break;
  case 0x8144:
    Wire.write(byte(0x12));
    Wire.write(byte(0x34));
    break;
  case 0x814e:
    Wire.write(byte(0x80 | 1));
    break;
  case 0x814f:
    Wire.write(byte(0x01));
    Wire.write(byte(x));
    Wire.write(byte(x >> 8));
    Wire.write(byte(y));
    Wire.write(byte(y >> 8));
    Wire.write(byte(0x00));
    Wire.write(byte(0x00));
    Wire.write(byte(0x00));
    x+= 1;
    y+= 1;
    break;
  }
  rx = 0;
}
 
void setup() {
  Wire.begin(20);
  Wire.onReceive(receiveEvent);
  Wire.onRequest(requestEvent);
  Serial.begin(115200);
 
}
 
void loop() {
  delay(100);
}

src/arch/arm32/mach-t113s3/romdisk/boot/mangopi.json

524     "i2c-t113:2@0x02502800": {
525         "clock-name": "bus-i2c2",
526         "clock-frequency": 400000,
527         "reset": 466,
528         "sda-gpio": 133,
529         "sda-gpio-config": 4,
530         "scl-gpio": 132,
531         "scl-gpio-config": 4
532     },

662     "ts-gt911": {
663         "i2c-bus": "i2c-t113.2",
664         "slave-address": 20,
665         "interrupt-gpio": 38,
666         "interrupt-gpio-config": 14,
667         "reset-gpio": 34,
668         "reset-gpio-config": 1
669     },

src/arch/arm32/mach-t113s3/driver/ts-gt911.c

 75 static bool_t gt911_write(struct i2c_device_t * dev, u16_t reg, u8_t * buf, int len)
 76 {
 77     struct i2c_msg_t msg;
 78     u8_t mbuf[256];
 79
 80     if(len > sizeof(mbuf) - 1)
 81         len = sizeof(mbuf) - 1;
 82     mbuf[0] = (reg >> 8) & 0xff;
 83     mbuf[1] = (reg >> 0) & 0xff;
 84     memcpy(&mbuf[2], buf, len);
 85
 86     msg.addr = dev->addr;
 87     msg.flags = 0;
 88     msg.len = 32;//len + 2;
 89     msg.buf = &mbuf[0];
 90
 91     if(i2c_transfer(dev->i2c, &msg, 1) != 1)
 92         return FALSE;
 93     return TRUE;
 94 }

134 static bool_t gt911_initial(struct i2c_device_t * dev)
135 {
136     u8_t cfg;
137     u8_t id[4];
138     u8_t ver[2];
139
140     if(!gt911_read(dev, GT911_CONFIG_DATA, &cfg, 1))
141         return FALSE;
142     if(!gt911_read(dev, GT911_PRODUCT_ID, &id[0], 4))
143         return FALSE;
144     if(!gt911_read(dev, GT911_FIRMWARE_VERSION, &ver[0], 2))
145         return FALSE;
146
147     LOG("GT911 Version: %c%c%c%c(0x%02x%02x)(0x%02x)\r\n", id[0], id[1], id[2], id[3], ver[1], ver[0], cfg);
148     return gt911_send_cfg(dev, (u8_t *)gt911_config_data, ARRAY_SIZE(gt911_config_data));
149 }

151 static void gt911_interrupt(void * data)
152 {
153     struct input_t * input = (struct input_t *)data;
154     struct ts_gt911_pdata_t * pdat = (struct ts_gt911_pdata_t *)input->priv;
155     u8_t status, buf[40];
156     u8_t * p;
157     int count, i;
158     int id, x, y;
159
160     LOG("%s++\r\n", __func__);
161     disable_irq(pdat->irq);
162     for(i = 0; i < 5; i++)
163     {
164         pdat->node[i].valid = 0;
165     }
166     if(gt911_read(pdat->dev, GT911_STATUS, &status, 1) && (status & (1 << 7)))
167     {
168         count = status & 0x0f;
169         if(count > 0 && count < 5)
170         {
171             if(gt911_read(pdat->dev, GT911_COOR_ADDR, &buf[0], count << 3))
172             {
173                 for(i = 0; i < count; i++)
174                 {
175                     p = &buf[i << 3];
176                     id = p[0];
177                     x = (p[2] << 8) | (p[1] << 0);
178                     y = (p[4] << 8) | (p[3] << 0);
179                     LOG("%s, count:%d, x:%d, y:%d\r\n", __func__, count, x, y);
...
209     enable_irq(pdat->irq);
210     LOG("%s--\r\n", __func__);
211 }

編譯、下載

$ make CROSS_COMPILE=arm-linux-gnueabihf- PLATFORM=arm32-t113s3
$ xfel ddr t113-s3
$ xfel write 0x40000000 output/xboot.bin
$ xfel exec 0x40000000

Arduino GT911可以正常工作，但是，中斷PB6無法被觸發

[    0.260214]GT911 Version: ABCD(0x3412)(0x01)
[    0.287074]Probe device 'ts-gt911.0' with ts-gt911

為了方便測試，司徒將PB6加上提昇電阻並且改成Falling中斷觸發

282     LOG("%s, gpio:%d, gpiocfg:%d, irqnum:%d\r\n", __func__, gpio, gpiocfg, irq);
283     if(gpio >= 0)
284     {
285         if(gpiocfg >= 0)
286             gpio_set_cfg(gpio, gpiocfg);
287         gpio_set_pull(gpio, GPIO_PULL_UP);
288     }
289     request_irq(pdat->irq, gt911_interrupt, IRQ_TYPE_EDGE_FALLING, input);

PB6=GPIO38、GPIOCFG=14、IRQ=262，這個IRQ應該是抓錯了？

[    0.266982]ts_gt911_probe, gpio:38, gpiocfg:14, irqnum:262

src/arch/arm32/mach-t113s3/romdisk/boot/mangopi.json

388     "irq-gic400@0x03020000": { "interrupt-base": 32, "interrupt-count": 224 },
389     "irq-t113-gpio@0x02000220": { "interrupt-base": 224, "interrupt-count":  8, "interrupt-parent":  101 },
390     "irq-t113-gpio@0x02000240": { "interrupt-base": 256, "interrupt-count":  8, "interrupt-parent":  103 },
391     "irq-t113-gpio@0x02000260": { "interrupt-base": 288, "interrupt-count": 23, "interrupt-parent":  105 },
392     "irq-t113-gpio@0x02000280": { "interrupt-base": 320, "interrupt-count": 14, "interrupt-parent":  107 },
393     "irq-t113-gpio@0x020002a0": { "interrupt-base": 352, "interrupt-count":  7, "interrupt-parent":  109 },
394     "irq-t113-gpio@0x020002c0": { "interrupt-base": 384, "interrupt-count": 16, "interrupt-parent":  111 },

src/driver/interrupt/interrupt.c

191 bool_t request_irq(int irq, void (*func)(void *), enum irq_type_t type, void * data)
192 {
193     struct irqchip_t * chip;
194     int offset;
195
196     if(!func)
197         return FALSE;
198
199     chip = search_irqchip(irq);
200     if(!chip)
201         return FALSE;
202
203     offset = irq - chip->base;
204     if(chip->handler[offset].func != null_interrupt_function) {
205         return FALSE;
206     }
207
208     LOG("%s, irq:%d, chip->base:%d, offset:%d\r\n", __func__, irq, chip->base, offset);

XBoot修改到的中斷地址是屬於PC6，但是司徒的中斷是設定成PB6

[    0.272634]request_irq, irq:262, chip->base:256, offset:6

src/arch/arm32/mach-t113s3/driver/irq-t113-gpio.c

 92     addr = pdat->virt + GPIO_INT_CFG0 + ((offset >> 3) << 2);
 93     val = read32(addr);
 94     val &= ~(0xf << ((offset & 0x7) << 2));
 95     val |= ((cfg & 0x7) << ((offset & 0x7) << 2));
 96     write32(addr, val);
 97
 98     LOG("%s, addr:%p, type:%d, offset:%d\r\n", __func__, addr, type, offset);

果然修改到PC6 0x02000240

[    0.268151]ts_gt911_probe, gpio:38, gpiocfg:14, irqnum:262
[    0.273812]request_irq, irq:262, chip->base:256, offset:6
[    0.279202]irq_t113_gpio_settype, addr:0x02000240, type:3, offset:6
[    0.285373]Probe device 'ts-gt911.0' with ts-gt911

PB6是位於0x02000230

Workaround (src/driver/interrupt/interrupt.c)

 62 static struct irqchip_t * search_irqchip(int irq)
 63 {
 64     struct device_t * pos, * n;
 65     struct irqchip_t * chip;
 66
 67     list_for_each_entry_safe(pos, n, &__device_head[DEVICE_TYPE_IRQCHIP], head)
 68     {
 69         chip = (struct irqchip_t *)(pos->priv);
 70         if(irq == 230){
 71             if(chip->base == 224){
 72                 return chip;
 73             }
 74             continue;
 75         }
 76         if((irq >= chip->base) && (irq < (chip->base + chip->nirq)))
 77             return chip;
 78     }
 79     return NULL;
 80 }

191 bool_t request_irq(int irq, void (*func)(void *), enum irq_type_t type, void * data)
192 {
193     struct irqchip_t * chip;
194     int offset;
195
196     if(!func)
197         return FALSE;
198
199     if(irq == 262){
200         irq-= 32;
201     }

修改後，就可以正常中斷觸發並且回報觸控點

[    0.260653]GT911 Version: ABCD(0x3412)(0x01)
[    0.266935]ts_gt911_probe, gpio:38, gpiocfg:14, irqnum:262
[    0.272326]request_irq, irq:230, chip->base:224, offset:6
[    0.277959]irq_t113_gpio_settype, addr:0x02000220, type:3, offset:6
[    0.299301]Probe device 'ts-gt911.0' with ts-gt911
[    0.304091]Probe device 'g2d-t113.0' with g2d-t113
[    0.310178]Probe device 'fb-t113-rgb.0' with fb-t113-rgb
[    0.315658]Probe device 'console-uart.0' with console-uart
[    0.322001]mount /private with 'ram' filesystem
Press any key to stop auto boot:  0.000
xboot: /# 
[    5.434256]gt911_interrupt++
[    5.440101]gt911_interrupt, count:1, x:1, y:1
[    5.446270]gt911_interrupt--
[    9.054572]gt911_interrupt++
[    9.060405]gt911_interrupt, count:1, x:2, y:2
[    9.066782]gt911_interrupt--

Ary_Ye LV 5

@steward 啊啊啊，谢谢你的解决方法，我一直没怀疑是xboot中断设置问题，还在抓I2C信号，感谢你的解决方法，真心感谢XD

司徒 LV 6

@Ary_Ye
I2C 訊號需要先確定再去看中斷問題, 就我的測試, I2C 應該是可以正常工作, 所以你可以往硬件問題排錯, 例如：I2C 上拉電阻等問題, 或者延長 XBoot 對 GT911 的 Reset 時間～

tripod9 LV 5

@steward 感谢司徒的研究，发现了一个大BUG，中断号偏移计算错误，现已修复，打补丁如下：

diff --git a/src/arch/arm32/mach-t113s3/romdisk/boot/mangopi.json b/src/arch/arm32/mach-t113s3/romdisk/boot/mangopi.json
index 0f1f34283..4bc02d253 100644
--- a/src/arch/arm32/mach-t113s3/romdisk/boot/mangopi.json
+++ b/src/arch/arm32/mach-t113s3/romdisk/boot/mangopi.json
@@ -386,12 +386,12 @@
 	"reset-t113@0x02001d0c": { "reset-base": 1184, "reset-count": 32 },
 
 	"irq-gic400@0x03020000": { "interrupt-base": 32, "interrupt-count": 224 },
-	"irq-t113-gpio@0x02000220": { "interrupt-base": 224, "interrupt-count":  8, "interrupt-parent":  101 },
-	"irq-t113-gpio@0x02000240": { "interrupt-base": 256, "interrupt-count":  8, "interrupt-parent":  103 },
-	"irq-t113-gpio@0x02000260": { "interrupt-base": 288, "interrupt-count": 23, "interrupt-parent":  105 },
-	"irq-t113-gpio@0x02000280": { "interrupt-base": 320, "interrupt-count": 14, "interrupt-parent":  107 },
-	"irq-t113-gpio@0x020002a0": { "interrupt-base": 352, "interrupt-count":  7, "interrupt-parent":  109 },
-	"irq-t113-gpio@0x020002c0": { "interrupt-base": 384, "interrupt-count": 16, "interrupt-parent":  111 },
+	"irq-t113-gpio@0x02000220": { "interrupt-base": 256, "interrupt-count":  8, "interrupt-parent":  101 },
+	"irq-t113-gpio@0x02000240": { "interrupt-base": 288, "interrupt-count":  8, "interrupt-parent":  103 },
+	"irq-t113-gpio@0x02000260": { "interrupt-base": 320, "interrupt-count": 23, "interrupt-parent":  105 },
+	"irq-t113-gpio@0x02000280": { "interrupt-base": 352, "interrupt-count": 14, "interrupt-parent":  107 },
+	"irq-t113-gpio@0x020002a0": { "interrupt-base": 384, "interrupt-count":  7, "interrupt-parent":  109 },
+	"irq-t113-gpio@0x020002c0": { "interrupt-base": 416, "interrupt-count": 16, "interrupt-parent":  111 },
 
 	"gpio-t113@0x02000030": { "gpio-base":  32, "gpio-count":  8, "interrupt-offset": 256 },
 	"gpio-t113@0x02000060": { "gpio-base":  64, "gpio-count":  8, "interrupt-offset": 288 },

完整补丁见这个链接
https://github.com/xboot/xboot/commit/4e502b7ad6e4f589832d36a4513de00f0cb8de07