Class _usarta: Universal Synchronous Asynchronous Receiver Transmitter

_usarta objects are universal synchronous asynchronous receivers transmitters.

_usarta objects support several modes:

• asynchronous
• synchronous
• smartcard
• singlewire
• irda
• lin

Actions

configure:

hw | hwa ( configure,   usart1,
 
         [ mode,        asynchronous ]          // Default mode is `asynchronous`.
 
         [ bps,         BPS, ]                  // Transfer rate in bits per second.
 
         [ databits,    8 | 9, ]                // Number of data bits in frame. Default is `8`.
 
         [ parity,      none, even, odd, ]      // Parity. Default is `none`
 
         [ stopbits,    1 | 2, ]                // Number of stop bits in frame. Default is `1`.
 
         [ receiver,    enabled | disabled, ]   // Whether the UART can receive. Default is `enabled`.
 
         [ transmitter, enabled | disabled, ]   // Whether the UART can transmit. Default is `enabled`.
         );

Counter used as encoder:

hw | hwa ( configure,   encoder(counter2),
         );

read:

uint16_t v = hw( read, usart1 );

Interrupts

hw | hwa ( turn, (systick,irq), on | off );

if ( hw( read, (systick,irq) )       // Reading the flag clears it
  hw(toggle,LED);

Registers

• sr
  • cts
  • lbd
  • txe
  • tc
  • rxne
  • idle
  • ore
  • ne
  • fe
  • pe
• dr
• brr
  • divmantissa
  • divfraction
• cr1
  • ue
  • m
  • wake
  • pce
  • ps
  • peie
  • txeie
  • tcie
  • rxneie
  • idleie
  • te
  • re
  • rwu
  • sbk
• cr2
  • linen
  • stop
  • clken
  • cpol
  • cpha
  • lbcl
  • lbdie
  • lbdl
  • add
• cr3
  • ctsie
  • ctse
  • rtse
  • dmat
  • dmar
  • scen
  • nack
  • hdsel
  • irlp
  • iren
  • eie
• gtpr
  • gt
  • psc