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Harmonize stm32 ticks and sleep (#1673)
machine/stm32f*: move to harmonized tick / sleep logic code
This commit is contained in:
kenbell
GitHub
@@ -3,30 +3,8 @@
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package runtime
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import (
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"device/arm"
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"device/stm32"
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"machine"
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"runtime/interrupt"
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"runtime/volatile"
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)
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func init() {
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initCLK()
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initTIM3()
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machine.UART0.Configure(machine.UARTConfig{})
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initTIM7()
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}
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func putchar(c byte) {
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machine.UART0.WriteByte(c)
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}
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const (
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HSE_STARTUP_TIMEOUT = 0x0500
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PLL_M = 4
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PLL_N = 216
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PLL_P = 2
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PLL_Q = 2
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)
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/*
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@@ -39,6 +17,54 @@ const (
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| APB2(PCLK2) | 108mhz |
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+-------------+--------+
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*/
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const (
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HSE_STARTUP_TIMEOUT = 0x0500
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PLL_M = 4
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PLL_N = 216
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PLL_P = 2
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PLL_Q = 2
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)
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/*
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timer settings used for tick and sleep.
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note: TICK_TIMER_FREQ and SLEEP_TIMER_FREQ are controlled by PLL / clock
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settings above, so must be kept in sync if the clock settings are changed.
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*/
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const (
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TICK_RATE = 1000 // 1 KHz
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SLEEP_TIMER_IRQ = stm32.IRQ_TIM3
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SLEEP_TIMER_FREQ = 54000000 // 54 MHz (2x APB1)
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TICK_TIMER_IRQ = stm32.IRQ_TIM7
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TICK_TIMER_FREQ = 54000000 // 54 MHz (2x APB1)
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)
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type arrtype = uint32
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const asyncScheduler = false
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func init() {
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initCLK()
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initSleepTimer(&timerInfo{
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EnableRegister: &stm32.RCC.APB1ENR,
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EnableFlag: stm32.RCC_APB1ENR_TIM3EN,
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Device: stm32.TIM3,
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})
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machine.UART0.Configure(machine.UARTConfig{})
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initTickTimer(&timerInfo{
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EnableRegister: &stm32.RCC.APB1ENR,
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EnableFlag: stm32.RCC_APB1ENR_TIM7EN,
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Device: stm32.TIM7,
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})
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}
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func putchar(c byte) {
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machine.UART0.WriteByte(c)
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}
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func initCLK() {
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// PWR_CLK_ENABLE
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stm32.RCC.APB1ENR.SetBits(stm32.RCC_APB1ENR_PWREN)
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@@ -102,107 +128,3 @@ func initOsc() {
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for !stm32.RCC.CR.HasBits(stm32.RCC_CR_PLLRDY) {
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}
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}
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var (
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// tick in milliseconds
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tickCount timeUnit
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)
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var timerWakeup volatile.Register8
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func ticksToNanoseconds(ticks timeUnit) int64 {
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return int64(ticks) * 1000
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}
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func nanosecondsToTicks(ns int64) timeUnit {
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return timeUnit(ns / 1000)
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}
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// Enable the TIM3 clock.(sleep count)
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func initTIM3() {
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stm32.RCC.APB1ENR.SetBits(stm32.RCC_APB1ENR_TIM3EN)
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intr := interrupt.New(stm32.IRQ_TIM3, handleTIM3)
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intr.SetPriority(0xc3)
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intr.Enable()
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}
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// Enable the TIM7 clock.(tick count)
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func initTIM7() {
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stm32.RCC.APB1ENR.SetBits(stm32.RCC_APB1ENR_TIM7EN)
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// CK_INT = APB1 x2 = 54mhz
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stm32.TIM7.PSC.Set(54000000/10000 - 1) // 54mhz to 10khz(0.1ms)
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stm32.TIM7.ARR.Set(10 - 1) // interrupt per 1ms
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// Enable the hardware interrupt.
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stm32.TIM7.DIER.SetBits(stm32.TIM_DIER_UIE)
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// Enable the timer.
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stm32.TIM7.CR1.SetBits(stm32.TIM_CR1_CEN)
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intr := interrupt.New(stm32.IRQ_TIM7, handleTIM7)
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intr.SetPriority(0xc1)
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intr.Enable()
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}
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const asyncScheduler = false
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// sleepTicks should sleep for specific number of microseconds.
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func sleepTicks(d timeUnit) {
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timerSleep(uint32(d))
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}
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// number of ticks (microseconds) since start.
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func ticks() timeUnit {
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// milliseconds to microseconds
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return tickCount * 1000
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}
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// ticks are in microseconds
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func timerSleep(ticks uint32) {
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timerWakeup.Set(0)
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// CK_INT = APB1 x2 = 54mhz
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// prescale counter down from 54mhz to 10khz aka 0.1 ms frequency.
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stm32.TIM3.PSC.Set(54000000/10000 - 1)
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// set duty aka duration
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arr := (ticks / 100) - 1 // convert from microseconds to 0.1 ms
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if arr == 0 {
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arr = 1 // avoid blocking
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}
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stm32.TIM3.ARR.Set(arr)
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// Enable the hardware interrupt.
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stm32.TIM3.DIER.SetBits(stm32.TIM_DIER_UIE)
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// Enable the timer.
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stm32.TIM3.CR1.SetBits(stm32.TIM_CR1_CEN)
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// wait till timer wakes up
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for timerWakeup.Get() == 0 {
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arm.Asm("wfi")
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}
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}
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func handleTIM3(interrupt.Interrupt) {
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if stm32.TIM3.SR.HasBits(stm32.TIM_SR_UIF) {
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// Disable the timer.
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stm32.TIM3.CR1.ClearBits(stm32.TIM_CR1_CEN)
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// clear the update flag
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stm32.TIM3.SR.ClearBits(stm32.TIM_SR_UIF)
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// timer was triggered
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timerWakeup.Set(1)
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}
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}
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func handleTIM7(interrupt.Interrupt) {
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if stm32.TIM7.SR.HasBits(stm32.TIM_SR_UIF) {
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// clear the update flag
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stm32.TIM7.SR.ClearBits(stm32.TIM_SR_UIF)
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tickCount++
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}
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}
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