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machine.UART refactor (#3832)

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* add gosched calls to UART

* add UART.flush() stubs for all supported architectures

* add comment un uart.go on flush functionality

* uart.writeByte as base of UART usage

* fix NXP having duplicate WriteByte

* fix writeByte not returning error on some platforms

* add flush method for fe310 device

* check for error in WriteByte call to writeByte
This commit is contained in:
Patricio Whittingslow
2023-07-15 11:24:53 -03:00
committed by GitHub
parent c83f712c17
commit a7b205c26c
14 changed files with 69 additions and 19 deletions
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src/machine/machine_esp8266.go
+4 -2
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@@ -181,12 +181,14 @@ func (uart *UART) Configure(config UARTConfig) {
esp.UART0.UART_CLKDIV.Set(CPUFrequency() / config.BaudRate)
}
// WriteByte writes a single byte to the output buffer. Note that the hardware
// writeByte writes a single byte to the output buffer. Note that the hardware
// includes a buffer of 128 bytes which will be used first.
func (uart *UART) WriteByte(c byte) error {
func (uart *UART) writeByte(c byte) error {
for (esp.UART0.UART_STATUS.Get()>>16)&0xff >= 128 {
// Wait until the TX buffer has room.
}
esp.UART0.UART_FIFO.Set(uint32(c))
return nil
}
func (uart *UART) flush() {}