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machine/atsamd51: add support for ATSAMD51 processor using Adafruit ItsyBitsy-M4 board

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-06-06 12:03:58 +02:00
committed by Ayke
parent bc41cc688f
commit 02c4020228
9 changed files with 3054 additions and 0 deletions
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src/runtime/runtime_atsamd51g19.go
+43
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@@ -0,0 +1,43 @@
// +build sam,atsamd51,atsamd51g19
package runtime
import (
"device/sam"
)
func initSERCOMClocks() {
// Turn on clock to SERCOM0 for UART0
sam.MCLK.APBAMASK.SetBits(sam.MCLK_APBAMASK_SERCOM0_)
sam.GCLK.PCHCTRL7.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
// sets the "slow" clock shared by all SERCOM
sam.GCLK.PCHCTRL3.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
// Turn on clock to SERCOM1
sam.MCLK.APBAMASK.SetBits(sam.MCLK_APBAMASK_SERCOM1_)
sam.GCLK.PCHCTRL8.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
// Turn on clock to SERCOM2
sam.MCLK.APBBMASK.SetBits(sam.MCLK_APBBMASK_SERCOM2_)
sam.GCLK.PCHCTRL23.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
// Turn on clock to SERCOM3
sam.MCLK.APBBMASK.SetBits(sam.MCLK_APBBMASK_SERCOM3_)
sam.GCLK.PCHCTRL24.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
// Turn on clock to SERCOM4
sam.MCLK.APBDMASK.SetBits(sam.MCLK_APBDMASK_SERCOM4_)
sam.GCLK.PCHCTRL34.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
// Turn on clock to SERCOM5
sam.MCLK.APBDMASK.SetBits(sam.MCLK_APBDMASK_SERCOM5_)
sam.GCLK.PCHCTRL35.Set((sam.GCLK_PCHCTRL_GEN_GCLK1 << sam.GCLK_PCHCTRL_GEN_Pos) |
sam.GCLK_PCHCTRL_CHEN)
}