From b5badc857a2b3930fd53ae58829de8f3e91ed3ef Mon Sep 17 00:00:00 2001
From: imi415 <imi415@imi.moe>
Date: Tue, 29 Mar 2022 15:05:50 +0800
Subject: [PATCH] Disabled fast interrupt for open source toolchain.

---
 BSP/Startup/startup_ch32v30x_D8.S  | 10 +++++++---
 BSP/Startup/startup_ch32v30x_D8C.S | 10 +++++++---
 CMakeLists.txt                     |  1 +
 src/ch32v30x_it.c                  |  4 ++--
 src/main.c                         | 11 ++++++++++-
 src/syscalls.c                     |  7 +++++++
 6 files changed, 34 insertions(+), 9 deletions(-)
 create mode 100644 src/syscalls.c

diff --git a/BSP/Startup/startup_ch32v30x_D8.S b/BSP/Startup/startup_ch32v30x_D8.S
index 69c29cf..97f8262 100644
--- a/BSP/Startup/startup_ch32v30x_D8.S
+++ b/BSP/Startup/startup_ch32v30x_D8.S
@@ -4,8 +4,8 @@
 * Version            : V1.0.0
 * Date               : 2021/06/06
 * Description        : CH32V303 vector table for eclipse toolchain.
-* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
-* SPDX-License-Identifier: Apache-2.0
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* SPDX-License-Identifier: Apache-2.0
 *******************************************************************************/
 
 	.section	.init,"ax",@progbits
@@ -348,7 +348,11 @@ handle_reset:
     csrw 0xbc0, t0
 
     /* Enable nested and hardware stack */
-	li t0, 0x1f
+	/* li t0, 0x1f */ /* For MRS proprietary GCC compilers */
+
+    /* Enable nested interrupt, disable hardware stack */
+    li t0, 0x1e /* Refer to RISC-V4 PFIC manual */
+
 	csrw 0x804, t0
 
     /* Enable floating point and interrupt */
diff --git a/BSP/Startup/startup_ch32v30x_D8C.S b/BSP/Startup/startup_ch32v30x_D8C.S
index 8b2980b..85b2e34 100644
--- a/BSP/Startup/startup_ch32v30x_D8C.S
+++ b/BSP/Startup/startup_ch32v30x_D8C.S
@@ -4,8 +4,8 @@
 * Version            : V1.0.0
 * Date               : 2021/06/06
 * Description        : CH32V307-CH32V305 vector table for eclipse toolchain.
-* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
-* SPDX-License-Identifier: Apache-2.0
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* SPDX-License-Identifier: Apache-2.0
 *******************************************************************************/
 
 	.section	.init,"ax",@progbits
@@ -368,7 +368,11 @@ handle_reset:
     csrw 0xbc0, t0
 
     /* Enable nested and hardware stack */
-	li t0, 0x1f
+	/* li t0, 0x1f */ /* For MRS proprietary GCC compilers */
+
+    /* Enable nested interrupt, disable hardware stack */
+    li t0, 0x1e /* Refer to RISC-V4 PFIC manual */
+
 	csrw 0x804, t0
 
     /* Enable floating point and interrupt */
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3115173..893f6d1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,6 +47,7 @@ set(TARGET_C_SOURCES
     "BSP/Peripheral/src/ch32v30x_wwdg.c"
     "src/ch32v30x_it.c"
     "src/main.c"
+    "src/syscalls.c"
     "src/system_ch32v30x.c"
 )
 
diff --git a/src/ch32v30x_it.c b/src/ch32v30x_it.c
index ac3af18..8ffbce2 100644
--- a/src/ch32v30x_it.c
+++ b/src/ch32v30x_it.c
@@ -9,8 +9,8 @@
 *******************************************************************************/
 #include "ch32v30x_it.h"
 
-void NMI_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
-void HardFault_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
+void NMI_Handler(void) __attribute__((interrupt()));
+void HardFault_Handler(void) __attribute__((interrupt()));
 
 /*********************************************************************
  * @fn      NMI_Handler
diff --git a/src/main.c b/src/main.c
index b78ca40..65f80a5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,16 @@
 // SPDX-License-Identifier: MIT
 
+#include <stdio.h>
+
+#include <debug.h>
+
 int main(void) {
+
+    USART_Printf_Init(115200);
+
+    printf("Hello world?\r\n");
+
     for(;;) {
         //
     }
-}
\ No newline at end of file
+}
diff --git a/src/syscalls.c b/src/syscalls.c
new file mode 100644
index 0000000..977632e
--- /dev/null
+++ b/src/syscalls.c
@@ -0,0 +1,7 @@
+#include <sys/stat.h>
+
+int _fstat(int file, struct stat *st) {
+  st->st_mode = S_IFCHR;
+
+  return 0;
+}
\ No newline at end of file