change imxrt board_uart_read() to non-blocking

simple host seems to work

Author: hathach

hw/bsp/imxrt/family.c

@@ -54,6 +54,21 @@ const uint8_t dcd_data[] = { 0x00 };
 //
 //--------------------------------------------------------------------+
 
+static void init_usb_phy(USBPHY_Type* usb_phy) {
+  // Enable PHY support for Low speed device + LS via FS Hub
+  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
+
+  // Enable all power for normal operation
+  // TODO may not be needed since it is called within CLOCK_EnableUsbhs0PhyPllClock()
+  usb_phy->PWD = 0;
+
+  // TX Timing
+  uint32_t phytx = usb_phy->TX;
+  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
+  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
+  usb_phy->TX = phytx;
+}
+
 void board_init(void)
 {
   // make sure the dcache is on.
@@ -117,52 +132,24 @@ void board_init(void)
 
   LPUART_Init(UART_PORT, &uart_config, freq);
 
-  //------------- USB0 -------------//
+  //------------- USB -------------//
+  // Note: RT105x RT106x and later have dual USB controllers.
 
   // Clock
   CLOCK_EnableUsbhs0PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
   CLOCK_EnableUsbhs0Clock(kCLOCK_Usb480M, 480000000U);
 
-  USBPHY_Type* usb_phy;
-
-  // RT105x RT106x have dual USB controller.
 #ifdef USBPHY1
-  usb_phy = USBPHY1;
+  init_usb_phy(USBPHY1);
 #else
-  usb_phy = USBPHY;
+  init_usb_phy(USBPHY);
 #endif
 
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  uint32_t phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
-
-  // RT105x RT106x have dual USB controller.
 #ifdef USBPHY2
   // USB1
   CLOCK_EnableUsbhs1PhyPllClock(kCLOCK_Usbphy480M, 480000000U);
   CLOCK_EnableUsbhs1Clock(kCLOCK_Usb480M, 480000000U);
-
-  usb_phy = USBPHY2;
-
-  // Enable PHY support for Low speed device + LS via FS Hub
-  usb_phy->CTRL |= USBPHY_CTRL_SET_ENUTMILEVEL2_MASK | USBPHY_CTRL_SET_ENUTMILEVEL3_MASK;
-
-  // Enable all power for normal operation
-  usb_phy->PWD = 0;
-
-  // TX Timing
-  phytx = usb_phy->TX;
-  phytx &= ~(USBPHY_TX_D_CAL_MASK | USBPHY_TX_TXCAL45DM_MASK | USBPHY_TX_TXCAL45DP_MASK);
-  phytx |= USBPHY_TX_D_CAL(0x0C) | USBPHY_TX_TXCAL45DP(0x06) | USBPHY_TX_TXCAL45DM(0x06);
-  usb_phy->TX = phytx;
+  init_usb_phy(USBPHY2);
 #endif
 }
 
@@ -208,8 +195,28 @@ uint32_t board_button_read(void)
 
 int board_uart_read(uint8_t* buf, int len)
 {
-  LPUART_ReadBlocking(UART_PORT, buf, len);
-  return len;
+  int count = 0;
+
+  while( count < len )
+  {
+    uint8_t const rx_count = LPUART_GetRxFifoCount(UART_PORT);
+    if (!rx_count)
+    {
+      // clear all error flag if any
+      uint32_t status_flags = LPUART_GetStatusFlags(UART_PORT);
+      status_flags  &= (kLPUART_RxOverrunFlag | kLPUART_ParityErrorFlag | kLPUART_FramingErrorFlag | kLPUART_NoiseErrorFlag);
+      LPUART_ClearStatusFlags(UART_PORT, status_flags);
+      break;
+    }
+
+    for(int i=0; i<rx_count; i++)
+    {
+      buf[count] = LPUART_ReadByte(UART_PORT);
+      count++;
+    }
+  }
+
+  return count;
 }
 
 int board_uart_write(void const * buf, int len)