Ganehag

Most recent activity

• Does the STM32 on the Espruino support UART with 7bit length?

  @Ganehag started

  • 11 comments
  • 8,897 views

  @Gordon replied
• Does the STM32 on the Espruino support UART with 7bit length?

  in General • 11 years, 2 months

  

  I've got it working on an STM32VLDiscovery board. Having a hard time to decide if we should handle 7bit in C or in JS code. As we could easily do:

  function handleData(v) {
      for(var i=0; i < v.data.length; i++) {
          print( String.fromCharCode( v.data[i].charCodeAt(0) & 0x7F ));
      }
  }
  

  To handle 7e1 mode in JS code.

• Does the STM32 on the Espruino support UART with 7bit length?

  in General • 11 years, 2 months

  

  But of course :-). Another thing I was playing around with was menuconfig support for the build environment. Is this something you are interested in Gordon? Like the menuconfig system used for the Linux kernel. It would be nice to have an easy way to configure the build environment and what to include in your own build.

• Does the STM32 on the Espruino support UART with 7bit length?

  in General • 11 years, 2 months

  

  Sounds good. I will implement it and try it out in the next couple of days.

• Does the STM32 on the Espruino support UART with 7bit length?

  in General • 11 years, 2 months

  

  The need for 7bits comes from the IEC61107 specification. I was trying to port some code to read data from an Ultraheat 2WR5 energy meter into JS. As far as I remember, the standard it uses 2 stop bits. So the hack mentioned in the forum might be possible. I will make some minor modifications to the UARTinfo struct to add support for mode selection. If it work as expected I will do a pull request. Any preferences from you Gordon? char[4] with content like "7e2", "8n1", "8e1" etc? Or should we ignore mode select from mainline?

• Does the STM32 on the Espruino support UART with 7bit length?

  in General • 11 years, 2 months

  

  Both USART_WordLength_8b and USART_WordLength_9b are defined in the header files. But USART_WordLength_7b is not. And since USART_WordLength_8b begins at 0x0 I suspect that the MCU does not support 7bit UART mode.