search

openwch / ch32v003

CH32V003 is an ultra-cheap RISC-V MCU with 2KB SRAM, 16KB flash, and up to 18 GPIOs that sells for under $0.10
373 stars 56 forks source link

Documentation: CH32V003RM.PDF v1.4: Does not match with physical device settings #17

Open siuyin opened 1 year ago

siuyin commented 1 year ago

The reference manual: http://www.wch-ic.com/downloads/CH32V003RM_PDF.html
Section 3.4 Register description (page 17 on v1.4) states
R32_RCC_CFGR0 has a reset value of 0x00000000.

This is incorrect. On a physical device, the reset value was found to be 0x00000020.

Please update the documentation or issue an errata for the CH32V003 part.

qiyongshuang commented 1 year ago

What method are you using to read the registers? I read it 0X00000000

siuyin commented 1 year ago

The clock frequency immediately after reset should be 24MHz but the batch of CH32V003 chips I have run at 8MHz.

qiyongshuang commented 1 year ago

Did you see the print or the MCO pin? Which CH32V003 chip do you use? I use ch32V003F4P6 do not have the problem .Do you use our EVT as test project?

siuyin commented 1 year ago

I used CH32V003F4P6 and measured system clock frequency by switching an LED on and off with a logic analyser. This is the test code I used:https://github.com/siuyin/ch32v003fun/blob/871a7350aac339c28b52cc4c08f3cd86e4bc2701/examples/minimal_blink/minimal_blink.c#L41

The setup code is: https://github.com/siuyin/ch32v003fun/blob/871a7350aac339c28b52cc4c08f3cd86e4bc2701/ch32v003fun/ch32v003fun.c#L766

SETUP_SYSTICK_HCLK is: https://github.com/siuyin/ch32v003fun/blob/871a7350aac339c28b52cc4c08f3cd86e4bc2701/ch32v003fun/ch32v003fun.h#L4856

qiyongshuang commented 1 year ago

I grabbed the MCO pin through the oscilloscope, and the system frequency shows 24M. I suspect your test program have question.

siuyin commented 1 year ago

R32_RCC_CFGR0 immediately after reset = 0x20. Causes HCLK=8MHz. According to documentation CFGR0 should be /1 but is actually /3.

RCC_CFGR-2023-05-26 18-10-32

mrx23dot commented 11 months ago

this also doesn't seem right rstrstrrrrr

siuyin commented 11 months ago

Indeed UART Enable should enable when set.

mrx23dot commented 11 months ago

It maybe meant that when disabled it waits for ongoing.

mrx23dot commented 11 months ago

This should be BRR

rstWolf

mrx23dot commented 11 months ago

USART_CTLR1_OVER8 ((uint16_t)0x8000) / USART Oversmapling 8-bits / is not documented

mrx23dot commented 11 months ago

LCKK says bit8 in doc, but ch32v00x_gpio.c says bit16

uint32_t tmp = 0x00010000;

qiyongshuang commented 8 months ago

Thank you very much, We will change it"uint32_t tmp = 0x00010000;"

mrx23dot commented 7 months ago

For some reason it asks me for password to open these in Foxit reader: CH32V003DS0.PDF CH32V003RM.PDF

could you please fix them?