cnlohr · cnlohr · Jun 7, 2026
diff --git a/bootloader/funconfig.h b/bootloader/funconfig.h
@@ -4,6 +4,7 @@
 #define FUNCONF_USE_DEBUGPRINTF 0
 #define CH32V003                1
 #define FUNCONF_SYSTICK_USE_HCLK 1
+#define FUNCONF_TINYVECTOR 1
 
 #endif
 
diff --git a/bootloader_v006/Makefile b/bootloader_v006/Makefile
@@ -5,7 +5,7 @@ CH32FUN:=../ch32fun/ch32fun
 TARGET_MCU:=CH32V006
 
 ADDITIONAL_C_FILES+=../rv003usb/rv003usb.S ../rv003usb/rv003usb.c
-EXTRA_CFLAGS:=-I. -I../lib -I../rv003usb
+EXTRA_CFLAGS:=-I. -I../lib -I../rv003usb -DUSE_TINY_BOOT
 
 LINKER_SCRIPT:=ch32v006-usb-bootloader.ld
 # LINKER_SCRIPT:=ch32v005-usb-bootloader.ld

diff --git a/bootloader_v006/bootloader.c b/bootloader_v006/bootloader.c
@@ -98,6 +98,9 @@ void boot_usercode()
 
 int main()
 {
+	// This is not set in the assembly code before-hand.
+	SysTick->CTLR = 5;
+
 	SystemInit();
 	usb_setup();
 	runwordpad = 0;

diff --git a/bootloader_v006/ch32v006-usb-bootloader.ld b/bootloader_v006/ch32v006-usb-bootloader.ld
@@ -1,4 +1,4 @@
-ENTRY( InterruptVector )
+ENTRY( Init )
 
 MEMORY
 {
@@ -123,6 +123,8 @@ SECTIONS
 	{
 		. = ALIGN(4);
 		__global_pointer$ = . + 0x3fc;
+		*(.beginning_of_ram)
+		KEEP(*(SORT_NONE(.beginning_of_ram)))
 		*(.gnu.linkonce.r.*)
 		*(.data .data.*)
 		*(.gnu.linkonce.d.*)

diff --git a/bootloader_v006/funconfig.h b/bootloader_v006/funconfig.h
@@ -4,5 +4,8 @@
 #define FUNCONF_USE_DEBUGPRINTF  0
 #define FUNCONF_SYSTICK_USE_HCLK 1
 
+#define FUNCONF_OVERRIDE_STARTUP 1
+#define FUNCONF_TINYVECTOR 1
+
 #endif
 
diff --git a/ch32fun b/ch32fun
diff --git a/rv003usb/rv003usb.S b/rv003usb/rv003usb.S
@@ -56,7 +56,8 @@ Compressed:
 #warning "CH32V003"
 .section .text.vector_handler
 #else
-.section .srodata, "ax"
+// To force 1024-byte-alignment.
+.section .beginning_of_ram, "ax"
 #endif
 .global EXTI7_0_IRQHandler
 
@@ -1036,8 +1037,8 @@ insert_stuffed_bit:
 // into main... as well as providing EXTI7_0_IRQHandler jump at interrupt
 
 .section .init
-.global InterruptVector
-InterruptVector:
+.global Init
+Init:
 	.align  2
 .option push
 .option norelax
@@ -1047,17 +1048,47 @@ InterruptVector:
 	la sp, _eusrstack  // sp = 0x20000800
 	li a0, 0x80
 	csrw mstatus, a0
+#if !defined(CH32V00x) || !CH32V00x
 	csrw mtvec, 3
 	addi a0, sp, -2048 // a0 = 0x20000000
-	addi gp, a0, 0x3fc // gp = 0x200003fc
+	addi gp, a0, 0x3fc // gp = 0x200003fc // The fast way.
+#else
+	la a0, EXTI7_0_IRQHandler
+	csrw mtvec, a0 // VEctor will be at beginning of RAM.
+	la gp, __global_pointer$  // The slow, clean way.
+#endif
+
+#if CH32V00x
+	la a0, _sbss
+	la a1, _ebss
+	li a2, 0
+	bge a0, a1, 2f
+1:	sw a2, 0(a0)
+	addi a0, a0, 4
+	blt a0, a1, 1b
+
+	// This loads DATA from FLASH to RAM.
+	la a0, _data_lma
+	la a1, _data_vma
+	la a2, _edata
+1:	beq a1, a2, 2f
+	lw a3, 0(a0)
+	sw a3, 0(a1)
+	addi a0, a0, 4
+	addi a1, a1, 4
+	bne a1, a2, 1b
+2:
+#else
 	c.li a4, 0
 1: c.sw a4, 0(a0)	// Clear RAM
 	c.addi a0, 4
 	blt a0, sp, 1b  // Iterate over RAM until it's cleared.
 2:
+
 	//XXX WARNING: NO .DATA SECTION IS AVAILABLE HERE!
 	/* SystemInit48HSI */
 
+	// Setup clocks here on 003.
 	// RCC_BASE     = 0x40021000
 	// FLASH_R_BASE = 0x40022000
 	// EXTEND       = 0x40023800
@@ -1069,14 +1100,20 @@ InterruptVector:
 	c.sw a1, 0(a3)      /* FLASH->ACTLR = FLASH_ACTLR_LATENCY_1 */
 	c.li a1, 0x00000002 /* RCC->CFGR0 = RCC_SW_PLL */
 	c.sw a1, 4(a2)
+#endif
+
 	la a1, main
 	csrw mepc, a1
 .option pop
 	mret
 
 // CAREFUL THIS MUST BE EXACTLY AT 0x50
+
+#if !CH32V00x
 . = 0x52 // Weird...  I don't know why this has to be 0x52, for it to be at 0x50.
 	.word EXTI7_0_IRQHandler            /* EXTI Line 7..0 */
+#endif
+
 always0:
 	.byte 0x00 // Automatically expands out to 4 bytes.
+70 −50		ch32fun/ch32fun.c
+17 −6		ch32fun/ch32fun.h
+2 −0		ch32fun/ch32fun.mk
+16 −0		ch32fun/ch32v30xhw.h
+12 −7		ch32fun/ch32x00xhw.h
+199 −6		ch32fun/ch5xxhw.h
+58 −20		examples/cap_touch_adc/cap_touch_adc.c
+13 −0		examples/dma_scheduled_io/Makefile
+235 −0		examples/dma_scheduled_io/dma_scheduled_io.c
+10 −0		examples/dma_scheduled_io/funconfig.h
+11 −0		examples/vector_free_table_irq/Makefile
+13 −0		examples/vector_free_table_irq/funconfig.h
+80 −0		examples/vector_free_table_irq/vector_free_table_irq.c
+3 −3		examples_ch5xx/uart_send_receive/fun_uart_ch5xx.h
+3 −3		examples_usb/USBFS/usbfs_cdc_uart/uart.c
+0 −17		examples_usb/USBFS/usbfs_cdc_uart/uart.h
+11 −0		examples_usb/USBFS/usbfs_device/Makefile
+40 −2		examples_usb/USBFS/usbfs_device/usbfs_device.c
+21 −0		examples_usb/USBFS/usbfs_device/usbhidtool/Makefile
+122 −0		examples_usb/USBFS/usbfs_device/usbhidtool/usbhidtool.c
+1 −0		examples_usb/USBFS/usbfs_device/usbhidtool/winbuild.bat
+44 −4		extralibs/ch32v00x_touch.h
+5 −0		extralibs/fsusb.c
+1 −1		extralibs/iSLER.h
+13 −3		extralibs/ssd1306.h
+4 −0		minichlink/99-minichlink.rules
+3 −2		minichlink/microgdbstub.h
+7 −5		minichlink/minichlink.c
+ −		minichlink/minichlink.exe
+1 −1		minichlink/minichlink.h
+0 −0		minichlink/os_generic.h
+68 −26		minichlink/pgm-b003fun.c
+29 −7		minichlink/pgm-esp32s2-ch32xx.c
+20 −12		minichlink/pgm-wch-isp.c
+7 −7		minichlink/version
+34 −0		misc/attic/rv003usb_bootloader_stubs_for_minichlink/erase_block.asm
+67 −0		misc/attic/rv003usb_bootloader_stubs_for_minichlink/write_block.asm
+14 −0		projects/ch32v00x_inductance_tester/Makefile
+49 −0		projects/ch32v00x_inductance_tester/README.md
+274 −0		projects/ch32v00x_inductance_tester/ch32v00x_inductance_tester.c
+12 −0		projects/ch32v00x_inductance_tester/funconfig.h
+9 −0		projects/hx711_load_cell_amplifier/Makefile
+25 −0		projects/hx711_load_cell_amplifier/README.md
+10 −0		projects/hx711_load_cell_amplifier/funconfig.h
+178 −0		projects/hx711_load_cell_amplifier/hx711.h
+118 −0		projects/hx711_load_cell_amplifier/hx711_load_cell_amplifier.c
+ −		projects/hx711_load_cell_amplifier/schematic.png