Display led 7 segments 4 digits with received data from STM32F030 usart

[huonglq91]

Posted on May 21, 2014 at 08:42The original post was too long to process during our migration. Please click on the attachment to read the original post.

[waclawek.jan]

Posted on May 21, 2014 at 09:05

You should familiarize yourself with the ''volatile'' qualifier.

JW

[huonglq91]

Posted on May 21, 2014 at 09:31

Thank waclawek.jan!

But I don't understand what you mean.Could you change my code for example?And could you show me the problem in my code?Thank you again.

[Tesla DeLorean]

Posted on May 22, 2014 at 15:51

A lot to wade through there, would be a bit more efficient with a switch/case for the decode. Even an if/then/else construct.

The problem, I suspect, is that you are sending ASCII characters, '0' to '9' and expecting them to be decimal numbers 0 - 9, but are instead 0x30 .. 0x39. You need to translate them, either manually or with atoi(), and you perhaps want your 7-Segment decoder to have a default for characters it doesn't recognize, like '-'

[Andrew Neil]

Posted on May 22, 2014 at 21:17

''would be a bit more efficient with a switch/case for the decode''

Or a lookup table; eg, 

http://www.8052.com/forum/read/55866

[Md Mubdiul Hasan]

Posted on October 24, 2016 at 03:21

Dear Sir Clive,

This user trying to make UART data to 4 digit display.In case of SPI data, if uint8_t pDataRx[4] is turned to BCD and fed them in 74HC4511 decoder-driver to 4 digit display. It will work? Further translation is needed or not?

[Tesla DeLorean]

Posted on October 24, 2016 at 21:14

This user trying to make UART data to 4 digit display. In case of SPI data, if uint8_t pDataRx[4] is turned to BCD and fed them in 74HC4511 decoder-driver to 4 digit display. It will work? Further translation is needed or not?

Let's keep this in [DEAD LINK /public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/converting%20BCD&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/AllItems.aspx&currentviews=101]one thread please.Present the data you are receiving, and what you want/expect to be displayed, provide multiple examples.

https://www.sparkfun.com/datasheets/IC/74HC4511.pdf