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machine/samd21: init all SERCOM clocks to better handle board variants

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-03-04 16:07:21 +01:00
parent 9b4071237f
commit 6e5ae83302
1 changed files with 29 additions and 17 deletions
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src/runtime/runtime_atsamd21.go
+29 -17
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@@ -22,8 +22,7 @@ func main() {
func init() {
initClocks()
initRTC()
initUARTClock()
initI2CClock()
initSERCOMClocks()
initUSBClock()
// connect to USB CDC interface
@@ -293,7 +292,7 @@ func handleRTC() {
timerWakeup = true
}
func initUARTClock() {
func initSERCOMClocks() {
// Turn on clock to SERCOM0 for UART0
sam.PM.APBCMASK |= sam.PM_APBCMASK_SERCOM0_
@@ -306,31 +305,44 @@ func initUARTClock() {
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
// Turn on clock to SERCOM1 for UART1
// Turn on clock to SERCOM1
sam.PM.APBCMASK |= sam.PM_APBCMASK_SERCOM1_
// Use GCLK0 for SERCOM1 aka UART1
// 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_SERCOM1_CORE << sam.GCLK_CLKCTRL_ID_Pos) |
(sam.GCLK_CLKCTRL_GEN_GCLK0 << sam.GCLK_CLKCTRL_GEN_Pos) |
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
}
func initI2CClock() {
// Turn on clock to SERCOM3 for I2C0
// Turn on clock to SERCOM2
sam.PM.APBCMASK |= sam.PM_APBCMASK_SERCOM2_
sam.GCLK.CLKCTRL = sam.RegValue16((sam.GCLK_CLKCTRL_ID_SERCOM2_CORE << sam.GCLK_CLKCTRL_ID_Pos) |
(sam.GCLK_CLKCTRL_GEN_GCLK0 << sam.GCLK_CLKCTRL_GEN_Pos) |
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
// Turn on clock to SERCOM3
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()
// Turn on clock to SERCOM4
sam.PM.APBCMASK |= sam.PM_APBCMASK_SERCOM4_
// Use GCLK0 for SERCOM4
sam.GCLK.CLKCTRL = sam.RegValue16((sam.GCLK_CLKCTRL_ID_SERCOM4_CORE << sam.GCLK_CLKCTRL_ID_Pos) |
(sam.GCLK_CLKCTRL_GEN_GCLK0 << sam.GCLK_CLKCTRL_GEN_Pos) |
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
// Turn on clock to SERCOM5
sam.PM.APBCMASK |= sam.PM_APBCMASK_SERCOM5_
// Use GCLK0 for SERCOM5
sam.GCLK.CLKCTRL = sam.RegValue16((sam.GCLK_CLKCTRL_ID_SERCOM5_CORE << sam.GCLK_CLKCTRL_ID_Pos) |
(sam.GCLK_CLKCTRL_GEN_GCLK0 << sam.GCLK_CLKCTRL_GEN_Pos) |
sam.GCLK_CLKCTRL_CLKEN)
waitForSync()
}
func initUSBClock() {