romych/Ocean-240.2-Emulator
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zx80c99 implemented

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romych committed 2026-03-09 13:26:32 +03:00
1 parent 9cb2af2145
commit 0742e9969c
10 files changed
+2232 -26
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okean240/usart/usart8251.go
+14 -14
View File
@@ -1,19 +1,17 @@
// Package usart
// Universal Serial Asynchronous Receiver/Transmitter
// i8051, MSM82C51, КР580ВВ51
// By Romych, 2025.03.04
package usart
import log "github.com/sirupsen/logrus"
/**
Universal Serial Asynchronous Receiver/Transmitter
i8051, MSM82C51, КР580ВВ51
//const I8251DSRFlag = 0x80
//const I8251SynDetFlag = 0x40
//const I8251FrameErrorFlag = 0x20
//const I8251OverrunErrorFlag = 0x10
//const I8251ParityErrorFlag = 0x08
By Romych, 2025.03.04
*/
const I8251DSRFlag = 0x80
const I8251SynDetFlag = 0x40
const I8251FrameErrorFlag = 0x20
const I8251OverrunErrorFlag = 0x10
const I8251ParityErrorFlag = 0x08
const I8251TxEnableFlag = 0x04
const I8251RxReadyFlag = 0x02
const I8251TxReadyFlag = 0x01
@@ -131,20 +129,22 @@ func (s *I8251) Command(value byte) {
func (s *I8251) Send(value byte) {
if s.txe {
s.bufferTx = append(s.bufferTx, value)
log.Debugf("Send byte: %x", value)
}
}
func (s *I8251) Receive() byte {
if s.rxe {
if len(s.bufferRx) > 0 {
res := s.bufferRx[0]
s.bufferRx = s.bufferRx[1:]
log.Debugf("ReceiveByte: %x", res)
log.Debugf("Receive: %x", res)
return res
}
log.Debugf("Receive: empty buffer")
} else {
log.Debugf("Receive: receiver disabled")
}
log.Debugf("ReceiveByte: empty buffer")
return 0
}