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machine/samd21: I2C implementation

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-01-21 14:35:40 +01:00
committed by Ayke van Laethem
parent 38c5e384af
commit 3ebf464da2
4 changed files with 258 additions and 1 deletions
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src/runtime/runtime_atsamd21g18.go
+15
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@@ -23,6 +23,7 @@ func init() {
initClocks()
initRTC()
initUARTClock()
initI2CClock()
// connect to UART
machine.UART0.Configure(machine.UARTConfig{})
@@ -306,3 +307,17 @@ func initUARTClock() {
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
}
func initI2CClock() {
// Turn on clock to SERCOM3 for I2C0
sam.PM.APBCMASK |= sam.PM_APBCMASK_SERCOM3_
// Use GCLK0 for SERCOM3 aka I2C0
// GCLK_CLKCTRL_ID( clockId ) | // Generic Clock 0 (SERCOMx)
// GCLK_CLKCTRL_GEN_GCLK0 | // Generic Clock Generator 0 is source
// GCLK_CLKCTRL_CLKEN ;
sam.GCLK.CLKCTRL = sam.RegValue16((sam.GCLK_CLKCTRL_ID_SERCOM3_CORE << sam.GCLK_CLKCTRL_ID_Pos) |
(sam.GCLK_CLKCTRL_GEN_GCLK0 << sam.GCLK_CLKCTRL_GEN_Pos) |
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
}