all

2026-06-12 02:55:04 -07:00
commit 30406f4f49
2040 changed files with 571534 additions and 0 deletions
--- a/RTOS_Labs_common/UART2.c
+++ b/RTOS_Labs_common/UART2.c
@@ -0,0 +1,117 @@
+/* UART2.c
+ * Your name
+ * Data:
+ * PA22 UART2 Rx from other microcontroller PA8 UART1 Tx<br>
+ */
+
+#include <ti/devices/msp/msp.h>
+#include "../RTOS_Labs_common/UART2.h"
+#include "../inc/Clock.h"
+#include "../inc/LaunchPad.h"
+uint32_t LostData2;
+
+// power Domain PD0
+// for 80MHz bus clock, UART clock is ULPCLK 40MHz
+// initialize UART2 for 2000 baud rate
+// no transmit, interrupt on receive timeout
+void UART2_Init(void){
+    // do not reset or activate PortA, already done in LaunchPad_Init
+    // RSTCLR to GPIOA and UART2 peripherals
+    //   bits 31-24 unlock key 0xB1
+    //   bit 1 is Clear reset sticky bit
+    //   bit 0 is reset gpio port
+ // GPIOA->GPRCM.RSTCTL = (uint32_t)0xB1000003; // called previously
+  UART2->GPRCM.RSTCTL = 0xB1000003;
+    // Enable power to GPIOA and UART1 peripherals
+    // PWREN
+    //   bits 31-24 unlock key 0x26
+    //   bit 0 is Enable Power
+ // GPIOA->GPRCM.PWREN = (uint32_t)0x26000001; // called previously
+  UART2->GPRCM.PWREN = 0x26000001;
+  Clock_Delay(24); // time for uart to power up
+ // configure PA22 PA8 as alternate UART2 function
+  IOMUX->SECCFG.PINCM[PA22INDEX]  = 0x00040082;
+  //bit 18 INENA input enable
+  //bit 7  PC connected
+  //bits 5-0=2 for UART1_Rx
+  Fifo1_Init();
+  LostData2 = 0;
+  UART2->CLKSEL = 0x08; // bus clock
+  UART2->CLKDIV = 0x00; // no divide
+  UART2->CTL0 &= ~0x01; // disable UART1
+  UART2->CTL0 = 0x00020018;
+   // bit  17    FEN=1    enable FIFO
+   // bits 16-15 HSE=00   16x oversampling
+   // bit  14    CTSEN=0  no CTS hardware
+   // bit  13    RTSEN=0  no RTS hardware
+   // bit  12    RTS=0    not RTS
+   // bits 10-8  MODE=000 normal
+   // bits 6-4   TXE=001  enable TxD
+   // bit  3     RXE=1    enable TxD
+   // bit  2     LBE=0    no loop back
+   // bit  0     ENABLE   0 is disable, 1 to enable
+  if(Clock_Freq() == 40000000){
+      // 20000000/16 = 1,250,000 Hz
+     // Baud = 2000
+      //   1,250,000/2000 = 625
+      //   divider = 625
+    UART2->IBRD = 625;
+    UART2->FBRD = 0; // baud =1,250,000/625 = 2000
+  }else if (Clock_Freq() == 32000000){
+    // 32000000/16 = 2,000,000
+     // Baud = 2000
+      //   2,000,000/2000 = 1000
+      //   divider = 1000
+    UART2->IBRD = 1000;
+    UART2->FBRD = 0;
+  }else if (Clock_Freq() == 80000000){
+     // 40000000/16 = 2,500,000 Hz
+     // Baud = 2000
+      //    2,500,000/2000 = 1250
+      //   divider = 1250
+    UART2->IBRD = 1250;
+    UART2->FBRD = 0; // baud =2,500,000/1250 = 2000
+  }else return;
+  UART2->LCRH = 0x00000030;
+   // bits 5-4 WLEN=11 8 bits
+   // bit  3   STP2=0  1 stop
+   // bit  2   EPS=0   parity select
+   // bit  1   PEN=0   no parity
+   // bit  0   BRK=0   no break
+  UART2->CPU_INT.IMASK = 0x0001;
+  // bit 11 TXINT=0 no transmit interrupt
+  // bit 10 RXINT=0 no receive interrupt
+  // bit 0  Receive timeout
+  UART2->IFLS = 0x0422;
+  // bits 11-8 RXTOSEL receiver timeout select 4 (0xF highest)
+  // bits 6-4  RXIFLSEL 2 is greater than or equal to half
+  // bits 2-0  TXIFLSEL 2 is less than or equal to half
+  NVIC->ICPR[0] = 1<<14; // UART2 is IRQ 14
+  NVIC->ISER[0] = 1<<14;
+  NVIC->IP[3] = (NVIC->IP[3]&(~0x00FF0000))|(2<<22);  // set priority (bits 23-22) IRQ 14
+  UART2->CTL0 |= 0x01; // enable UART2
+}
+//------------UART2_InChar------------
+// Get new serial port receive data from FIFO1
+// Input: none
+// Output: Return 0 if the FIFO1 is empty
+//         Return nonzero data from the FIFO1 if available
+char UART2_InChar(void){
+  return Fifo1_Get();
+}
+
+
+void UART2_IRQHandler(void){ uint32_t status; char letter;
+  status = UART2->CPU_INT.IIDX; // reading clears bit in RIS
+  if(status == 0x01){   // 0x01 receive timeout
+    GPIOB->DOUTTGL31_0 = BLUE; // toggle PB22 (minimally intrusive debugging)
+    GPIOB->DOUTTGL31_0 = BLUE; // toggle PB22 (minimally intrusive debugging)
+    while((UART2->STAT&0x04) == 0){
+      letter = UART2->RXDATA;
+      if(Fifo1_Put(letter)==0){
+        LostData2++;
+      }
+    }
+    GPIOB->DOUTTGL31_0 = BLUE; // toggle PB22 (minimally intrusive debugging)
+  }
+}