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all: use less magic in memory-mapped IO

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Don't store addresses in the values of registers, this leads to problems
with char arrays (among others). Instead, do it like it's done in C with
raw addresses cast to struct pointers.

This commit also splits gen-device.py, as AVR and ARM have very
different ideas of what a register is. It's easier to just keep them
separate.
This commit is contained in:
Ayke van Laethem
2018-09-05 11:29:15 +02:00
parent 93248c93ed
commit 17b5b6ec5b
7 changed files with 296 additions and 209 deletions
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src/runtime/runtime_avr.go
+10 -10
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@@ -36,17 +36,17 @@ func init() {
func initUART() {
// Initialize UART at 115200 baud when running at 16MHz.
avr.USART.UBRR0H = 0
avr.USART.UBRR0L = 8
avr.USART.UCSR0B = avr.UCSR0B_RXEN0 | avr.UCSR0B_TXEN0 // enable RX and TX
avr.USART.UCSR0C = avr.UCSR0C_UCSZ0 // 8-bits data
*avr.UBRR0H = 0
*avr.UBRR0L = 8
*avr.UCSR0B = avr.UCSR0B_RXEN0 | avr.UCSR0B_TXEN0 // enable RX and TX
*avr.UCSR0C = avr.UCSR0C_UCSZ0 // 8-bits data
}
func putchar(c byte) {
for (avr.USART.UCSR0A & avr.UCSR0A_UDRE0) == 0 {
for (*avr.UCSR0A & avr.UCSR0A_UDRE0) == 0 {
// Wait until previous char has been sent.
}
avr.USART.UDR0 = avr.RegValue(c) // send char
*avr.UDR0 = avr.RegValue(c) // send char
}
// Sleep by the given amount.
@@ -73,21 +73,21 @@ func sleepWDT(period uint8) {
avr.Asm("cli")
avr.Asm("wdr")
// Start timed sequence.
avr.WDT.WDTCSR |= avr.WDTCSR_WDCE | avr.WDTCSR_WDE
*avr.WDTCSR |= avr.WDTCSR_WDCE | avr.WDTCSR_WDE
// Enable WDT and set new timeout (0.5s)
avr.WDT.WDTCSR = avr.WDTCSR_WDIE | avr.RegValue(period)
*avr.WDTCSR = avr.WDTCSR_WDIE | avr.RegValue(period)
avr.Asm("sei")
// Set sleep mode to idle and enable sleep mode.
// Note: when using something other than idle, the UART won't work
// correctly. This needs to be fixed, though, so we can truly sleep.
avr.CPU.SMCR = (0 << 1) | avr.SMCR_SE
*avr.SMCR = (0 << 1) | avr.SMCR_SE
// go to sleep
avr.Asm("sleep")
// disable sleep
avr.CPU.SMCR = 0
*avr.SMCR = 0
}
func monotime() uint64 {