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machine/stm32f103xx: support for SPI interface

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2018-12-28 16:55:51 +01:00
committed by Ayke van Laethem
parent f71e1bcf03
commit dccfae485c
5 changed files with 176 additions and 5 deletions
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src/runtime/runtime_stm32f103xx.go
+2 -1
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@@ -22,7 +22,8 @@ func putchar(c byte) {
// initCLK sets clock to 72MHz using HSE 8MHz crystal w/ PLL X 9 (8MHz x 9 = 72MHz).
func initCLK() {
stm32.FLASH.ACR |= stm32.FLASH_ACR_LATENCY_2 // Two wait states, per datasheet
stm32.RCC.CFGR |= stm32.RCC_CFGR_PPRE1_DIV_2 // prescale AHB1 = HCLK/2
stm32.RCC.CFGR |= stm32.RCC_CFGR_PPRE1_DIV_2 // prescale PCLK1 = HCLK/2
stm32.RCC.CFGR |= stm32.RCC_CFGR_PPRE2_DIV_4 // prescale PCLK2 = HCLK/4
stm32.RCC.CR |= stm32.RCC_CR_HSEON // enable HSE clock
// wait for the HSEREADY flag