generate proper events from touchscreen

extmod/modtrezormsg/modtrezormsg-stmhal.h

@@ -1,8 +1,10 @@
 extern struct _USBD_HandleTypeDef hUSBDDevice;
-extern int switch_get(void);
 extern uint8_t USBD_HID_SendReport(struct _USBD_HandleTypeDef *pdev, uint8_t *report, uint16_t len);
 extern int USBD_HID_Rx(uint8_t *buf, uint32_t len, uint32_t timeout);
 
+extern I2C_HandleTypeDef I2CHandle1;
+extern HAL_StatusTypeDef HAL_I2C_Master_Receive(I2C_HandleTypeDef *hi2c, uint16_t DevAddress, uint8_t *pData, uint16_t Size, uint32_t Timeout);
+
 void msg_init(void)
 {
 }
@@ -23,18 +25,23 @@ ssize_t msg_send(uint8_t iface, const uint8_t *buf, size_t len)
 // this should match values used in trezorui_poll_sdl_event() in modtrezorui/display-unix.h
 uint32_t msg_poll_ui_event(void)
 {
-    static int lp = 0;
+    static uint8_t data[16], old_data[16];
+    if (HAL_OK != HAL_I2C_Master_Receive(&I2CHandle1, 56 << 1, data, 16, 1)) {
+        return 0; // read failure
+    }
+    if (0 == memcmp(data, old_data, 16)) {
+        return 0; // no new event
+    }
     uint32_t r = 0;
-    int p = switch_get();
-    if (lp == 0 && p == 1) {
-        r = 0x00010000; // touch start
+    if (old_data[2] == 0 && data[2] == 1) {
+        r = 0x00010000 + (data[4] << 8) + data[6]; // touch start
     } else
-    if (lp == 1 && p == 1) {
-        r = 0x00020000; // touch move
+    if (old_data[2] == 1 && data[2] == 1) {
+        r = 0x00020000 + (data[4] << 8) + data[6]; // touch move
     }
-    if (lp == 1 && p == 0) {
-        r = 0x00040000; // touch end
+    if (old_data[2] == 1 && data[2] == 0) {
+        r = 0x00040000 + (data[4] << 8) + data[6]; // touch end
     }
-    lp = p;
+    memcpy(old_data, data, 16);
     return r;
 }

src/boot.py

@@ -4,3 +4,4 @@ if sys.platform in ['trezor', 'pyboard']: # stmhal
     import pyb
     # hid=(subclass, protocol, max_packet_len, polling_interval, report_desc)
     pyb.usb_mode('VCP+HID', vid=0x1209, pid=0x53C1, hid=(0, 0, 64, 1, b'\x06\x00\xff\x09\x01\xa1\x01\x09\x20\x15\x00\x26\xff\x00\x75\x08\x95\x40\x81\x02\x09\x21\x15\x00\x26\xff\x00\x75\x08\x95\x40\x91\x02\xc0'))
+    pyb.I2C(1, pyb.I2C.MASTER)