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tb/sw/src/slvMain.S

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+
+#define cdr_0_tx_status     0x40000000
+#define cdr_0_tx_txLen      0x40000004
+#define cdr_0_tx_txFifo     0x40000008
+#define cdr_0_rx_softReset  0x40000010
+#define cdr_0_rx_status     0x40000014
+#define cdr_0_rx_rxLen      0x40000018
+#define cdr_0_rx_rxFifo     0x4000001c
+#define cdr_1_tx_status     0x40000080
+#define cdr_1_tx_txLen      0x40000084
+#define cdr_1_tx_txFifo     0x40000088
+#define cdr_1_rx_softReset  0x40000090
+#define cdr_1_rx_status     0x40000094
+#define cdr_1_rx_rxLen      0x40000098
+#define cdr_1_rx_rxFifo     0x4000009c
+
+.global main
+
+
+main:
+	lui  x5, %hi(cdr_0_tx_status)
+
+	li   x6, 128
+	sw	 x6, 4(x5) #cdr_0_tx_txLen
+
+    li   x6, 32              # 设置循环次数
+1:
+	beqz x15, 3f             # 如果x10为0，则跳到3
+2:
+	li   x15, 0              # 清标志位
+    lw   x7, 0(x5)           # 读取cdr_0_tx_status的值
+    andi x7, x7, 0x2         # 检查第1比特（位1）
+    bnez x7, 2b              # 如果第1比特不为0，则回到2处继续循环
+
+3:
+    # 向cdr_0_tx_txFifo地址写入0x55，循环32次
+    sw   x6, 8(x5)          # 向cdr_0_tx_txFifo写入0x55
+    addi x6, x6, -1         # 递减计数器
+    bnez x6, 1b             # 如果计数器不为0，则继续循环
+
+4:	
+	j 4b 
+
+
+
+
+
+
+

tb/sw/src/slvStartup.S

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+
+
+#include "custom_ops.S"
+
+
+.extern main
+.globl _prog_start
+.section .text.init
+
+
+_prog_start:
+	li x15, 0
+	picorv32_maskirq_insn(zero, zero)
+	call main
+
+	li gp, 1;
+	ecall
+
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+.balign 32
+.section .trap_entry, "ax", %progbits
+trap_entry:
+	# q0 return address
+	# q1 bitmask of all IRQ to be handled, may be more than one IRQ 
+	# q2 q3 unused, can be use as temp storage register
+
+	# q寄存器已经禁用， Without the q-registers, the irq return address will be stored in x3 (gp) and the IRQ bitmask in x4 (tp),
+
+	addi x15, x4, 0
+
+	picorv32_retirq_insn()
+
+
+