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atsamd: Add support for SAMC21

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Signed-off-by: Luke Vuksta <wulfstawulfsta@gmail.com>
This commit is contained in:
Wulfsta
2023-01-16 01:32:31 -05:00
committed by KevinOConnor
parent 06e5c577bd
commit 3b0729c949
13 changed files with 311 additions and 31 deletions
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37
src/atsamd/timer.c
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@@ -11,19 +11,40 @@
#include "internal.h" // enable_pclock
#include "sched.h" // DECL_INIT
#if CONFIG_MACH_SAMC21
#define TCp TC0
#define TCp_IRQn TC0_IRQn
#define TCp_GCLK_ID TC0_GCLK_ID
#define ID_TCp ID_TC0
#define TCd_GCLK_ID TC1_GCLK_ID
#define ID_TCd ID_TC1
#else
#define TCp TC4
#define TCp_IRQn TC4_IRQn
#define TCp_GCLK_ID TC4_GCLK_ID
#define ID_TCp ID_TC4
#define TCd_GCLK_ID TC3_GCLK_ID
#define ID_TCd ID_TC3
#endif
// Set the next irq time
static void
timer_set(uint32_t value)
{
TC4->COUNT32.CC[0].reg = value;
TC4->COUNT32.INTFLAG.reg = TC_INTFLAG_MC0;
TCp->COUNT32.CC[0].reg = value;
TCp->COUNT32.INTFLAG.reg = TC_INTFLAG_MC0;
}
// Return the current time (in absolute clock ticks).
uint32_t
timer_read_time(void)
{
return TC4->COUNT32.COUNT.reg;
#if CONFIG_MACH_SAMC21
TCp->COUNT32.CTRLBSET.reg |= TC_CTRLBSET_CMD(TC_CTRLBCLR_CMD_READSYNC_Val);
while (TCp->COUNT32.SYNCBUSY.reg & TC_SYNCBUSY_COUNT)
;
#endif
return TCp->COUNT32.COUNT.reg;
}
// Activate timer dispatch as soon as possible
@@ -35,7 +56,7 @@ timer_kick(void)
// IRQ handler
void __aligned(16) // aligning helps stabilize perf benchmarks
TC4_Handler(void)
TCp_Handler(void)
{
irq_disable();
uint32_t next = timer_dispatch_many();
@@ -47,15 +68,15 @@ void
timer_init(void)
{
// Supply power and clock to the timer
enable_pclock(TC3_GCLK_ID, ID_TC3);
enable_pclock(TC4_GCLK_ID, ID_TC4);
enable_pclock(TCd_GCLK_ID, ID_TCd);
enable_pclock(TCp_GCLK_ID, ID_TCp);
// Configure the timer
TcCount32 *tc = &TC4->COUNT32;
TcCount32 *tc = &TCp->COUNT32;
irqstatus_t flag = irq_save();
tc->CTRLA.reg = 0;
tc->CTRLA.reg = TC_CTRLA_MODE_COUNT32;
armcm_enable_irq(TC4_Handler, TC4_IRQn, 2);
armcm_enable_irq(TCp_Handler, TCp_IRQn, 2);
tc->INTENSET.reg = TC_INTENSET_MC0;
tc->COUNT.reg = 0;
timer_kick();