run different code depending on the MHARTID reg value

raven/hello_raven.c

@@ -5,7 +5,7 @@
 #include "platform.h"
 #include "encoding.h"
 
-#define IOF_SPI1_MASK (0x38 | 0x4)
+#define IOF_ENABLE_TERMINAL (0x30000)
 int factorial(int i){
 
 	volatile int result = 1;
@@ -16,62 +16,35 @@ int factorial(int i){
 
 }
 
-unsigned read_adc(unsigned index){
-    unsigned char txdata[3];
-    unsigned result=0;
-    volatile int x;
 
-    txdata[0]=0x1;
-    txdata[1]=(0x8 | (index&0x7))<<4;
-    txdata[2]=0x0;
-
-    GPIO_REG(GPIO_IOF_SEL) &= ~IOF_SPI1_MASK;
-    GPIO_REG(GPIO_IOF_EN) |= IOF_SPI1_MASK;
-
-    SPI1_REG(SPI_REG_FMT) =
-            SPI_FMT_PROTO(SPI_PROTO_S) |
-            SPI_FMT_ENDIAN(SPI_ENDIAN_MSB) |
-            SPI_FMT_DIR(SPI_DIR_RX) |
-            SPI_FMT_LEN(8);
-    SPI1_REG(SPI_REG_CSID)   = 0;
-    SPI1_REG(SPI_REG_CSDEF) = 0xFFFF;
-    SPI1_REG(SPI_REG_SCKDIV)  = 7;
-    SPI1_REG(SPI_REG_SCKMODE) = SPI_SCK_PHA | SPI_SCK_POL; //shifted on the leading edge, sampled on trailing, Inactive state of SCK is logical 1
-    SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_HOLD;
-
-    while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL) ;
-    SPI1_REG(SPI_REG_TXFIFO) = txdata[0];
-    while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
-
-    while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL) ;
-    SPI1_REG(SPI_REG_TXFIFO) = txdata[1];
-    while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
-    result = (x & 0xFF)<<8;
-
-    while (SPI1_REG(SPI_REG_TXFIFO) & SPI_TXFIFO_FULL) ;
-    SPI1_REG(SPI_REG_TXFIFO) = txdata[2];
-    while ((x = SPI1_REG(SPI_REG_RXFIFO)) & SPI_RXFIFO_EMPTY);
-    result += (x & 0xFF);
-
-    SPI1_REG(SPI_REG_CSMODE) = SPI_CSMODE_AUTO;
-    return result&0x03ff;
-}
-
-//int read_csr(int csr_num) __attribute__((always_inline)) {
-//    int result;
-//    asm("csrr %0, %1" : "=r"(result) : "I"(csr_num));
-//    return result;
-//}
 
 int main()
 {
-	GPIO_REG(GPIO_IOF_EN) |= 0x30000;
-	*(int *)0x90000000 = 0x5AA5;
-	int result = factorial (10);
-	printf("Factorial of 10 is %d\n", result);
-	for(unsigned i=0; i<8; ++i)
-	    printf("ADC%u value read is %u\n", i, read_adc(i));
-    printf("Read a value from another thread %x\n", *(int *)0x80000000);
+	GPIO_REG(GPIO_IOF_EN) |= IOF_ENABLE_TERMINAL; // enable GPIO connection to the terminal
+
+    int hartid = read_csr(0xf14); // CSR_MHARTID
+    int target_mem_base = 0x90000000;
+    int local_mem_base  = 0x80000000;
+
+    if (hartid == 0) {
+    	int val_a = 2;
+    	int val_b = 3;
+    	*(int *)target_mem_base = val_a;
+    	*(int *)(target_mem_base+4) = val_b;
+    	printf("HW thread ID %d: write value A=%x and value B=%x to thread 1\n", hartid, val_a, val_b);
+    }
+
+
+    int result = factorial (10);
+	printf("HW thread ID %d: spend some time calculating factorial of 10 = %x\n", hartid, result);
+
+	if (hartid == 1) {
+		int val_a = *(int *)local_mem_base;
+		int val_b = *(int *)(local_mem_base+4);
+		int sum = val_a + val_b;
+    	printf("HW thread ID %d: sum of A+B=%x \n", hartid, sum);
+	}
+
 	printf("End of execution");
 	return 0;
 }