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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
@@ -3,31 +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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initTIM15()
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machine.UART0.Configure(machine.UARTConfig{})
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initTIM16()
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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 = 1
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PLL_N = 55
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PLL_P = 7 // RCC_PLLP_DIV7
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PLL_Q = 2 // RCC_PLLQ_DIV2
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PLL_R = 2 // RCC_PLLR_DIV2
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)
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/*
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@@ -40,6 +17,55 @@ const (
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| APB2(PCLK2) | 110mhz |
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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 = 1
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PLL_N = 55
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PLL_P = 7 // RCC_PLLP_DIV7
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PLL_Q = 2 // RCC_PLLQ_DIV2
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PLL_R = 2 // RCC_PLLR_DIV2
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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_TIM15
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SLEEP_TIMER_FREQ = 110000000 // 110 MHz
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TICK_TIMER_IRQ = stm32.IRQ_TIM16
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TICK_TIMER_FREQ = 110000000 // 110 MHz
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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.APB2ENR,
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EnableFlag: stm32.RCC_APB2ENR_TIM15EN,
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Device: stm32.TIM15,
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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.APB2ENR,
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EnableFlag: stm32.RCC_APB2ENR_TIM16EN,
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Device: stm32.TIM16,
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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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@@ -137,107 +163,3 @@ func initOsc() {
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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 TIM15 clock.(sleep count)
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func initTIM15() {
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stm32.RCC.APB2ENR.SetBits(stm32.RCC_APB2ENR_TIM15EN)
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intr := interrupt.New(stm32.IRQ_TIM15, handleTIM15)
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intr.SetPriority(0xc3)
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intr.Enable()
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}
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// Enable the TIM16 clock.(tick count)
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func initTIM16() {
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stm32.RCC.APB2ENR.SetBits(stm32.RCC_APB2ENR_TIM16EN)
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// CK_INT = APB1 = 110mhz
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stm32.TIM16.PSC.Set(110000000/10000 - 1) // 110mhz to 10khz(0.1ms)
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stm32.TIM16.ARR.Set(10 - 1) // interrupt per 1ms
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// Enable the hardware interrupt.
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stm32.TIM16.DIER.SetBits(stm32.TIM_DIER_UIE)
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// Enable the timer.
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stm32.TIM16.CR1.SetBits(stm32.TIM_CR1_CEN)
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intr := interrupt.New(stm32.IRQ_TIM16, handleTIM16)
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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 = 110mhz
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// prescale counter down from 110mhz to 10khz aka 0.1 ms frequency.
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stm32.TIM15.PSC.Set(110000000/10000 - 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.TIM15.ARR.Set(arr)
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// Enable the hardware interrupt.
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stm32.TIM15.DIER.SetBits(stm32.TIM_DIER_UIE)
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// Enable the timer.
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stm32.TIM15.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 handleTIM15(interrupt.Interrupt) {
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if stm32.TIM15.SR.HasBits(stm32.TIM_SR_UIF) {
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// Disable the timer.
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stm32.TIM15.CR1.ClearBits(stm32.TIM_CR1_CEN)
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// clear the update flag
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stm32.TIM15.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 handleTIM16(interrupt.Interrupt) {
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if stm32.TIM16.SR.HasBits(stm32.TIM_SR_UIF) {
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// clear the update flag
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stm32.TIM16.SR.ClearBits(stm32.TIM_SR_UIF)
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tickCount++
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}
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}
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