From 38efaf04756845be2c51756c277b06720b87bd12 Mon Sep 17 00:00:00 2001
From: cnlohr <lohr85@gmail.com>
Date: Fri, 21 Apr 2023 07:02:03 -0400
Subject: [PATCH] Allow ch32v003fun apps to use the debug registers.
---
ch32v003fun/ch32v003fun.c | 9 ++++++---
ch32v003fun/ch32v003fun.h | 10 +++++++++-
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/ch32v003fun/ch32v003fun.c b/ch32v003fun/ch32v003fun.c
index 262e4cd..6972e55 100644
--- a/ch32v003fun/ch32v003fun.c
+++ b/ch32v003fun/ch32v003fun.c
@@ -897,9 +897,12 @@ int putchar(int c)
return 1;
}
#else
-// For debug writing to the debug interface.
-#define DMDATA0 ((volatile uint32_t*)0xe00000f4)
-#define DMDATA1 ((volatile uint32_t*)0xe00000f8)
+
+// MSB .... LSB
+// DMDATA0: char3 char2 char1 [status word]
+// where [status word] is:
+// b7 = is a "printf" waiting?
+// b0..b3 = # of bytes in printf (+4). (4 or higher indicates a print of some kind)
int _write(int fd, const char *buf, int size)
{
diff --git a/ch32v003fun/ch32v003fun.h b/ch32v003fun/ch32v003fun.h
index 696a45f..7cd507c 100644
--- a/ch32v003fun/ch32v003fun.h
+++ b/ch32v003fun/ch32v003fun.h
@@ -4823,8 +4823,17 @@ extern "C" {
#define DELAY_MS_TIME (SYSTEM_CORE_CLOCK / 8000)
#if defined(__riscv) || defined(__riscv__)
+
+// Stuff that can only be compiled on device (not for the programmer, or other host programs)
+
void handle_reset() __attribute__((naked)) __attribute((section(".text.handle_reset"))) __attribute__((used));
void DefaultIRQHandler( void ) __attribute__((section(".text.vector_handler"))) __attribute__((naked)) __attribute__((used));
+
+
+// For debug writing to the debug interface.
+#define DMDATA0 ((volatile uint32_t*)0xe00000f4)
+#define DMDATA1 ((volatile uint32_t*)0xe00000f8)
+
#endif
void DelaySysTick( uint32_t n );
@@ -4845,7 +4854,6 @@ void SystemInit24HSI( void ); // No PLL, just raw internal RC oscillator.
void SystemInitHSE( int HSEBYP );
void SystemInitHSEPLL( int HSEBYP );
-
#define UART_BAUD_RATE 115200
#define OVER8DIV 4
#define INTEGER_DIVIDER (((25 * (APB_CLOCK)) / ((OVER8DIV) * (UART_BAUD_RATE))))
--
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