#include "ch.h"
+#include "hal.h"
#include "led.h"
#include "sleep_led.h"
+/* All right, we go the "software" way: timer, toggle LED in interrupt.
+ * Based on hasu's code for AVRs.
+ * Use LP timer on Kinetises, TIM14 on STM32F0.
+ */
+
+#if defined(KL2x) || defined(K20x)
+
+/* Use Low Power Timer (LPTMR) */
+#define TIMER_INTERRUPT_VECTOR KINETIS_LPTMR0_IRQ_VECTOR
+#define RESET_COUNTER LPTMR0->CSR |= LPTMRx_CSR_TCF
+
+#elif defined(STM32F0XX)
+
+/* Use TIM14 manually */
+#define TIMER_INTERRUPT_VECTOR STM32_TIM14_HANDLER
+#define RESET_COUNTER STM32_TIM14->SR &= ~STM32_TIM_SR_UIF
+
+#endif
+
+#if defined(KL2x) || defined(K20x) || defined(STM32F0XX) /* common parts for timers/interrupts */
+
+/* Breathing Sleep LED brighness(PWM On period) table
+ * (64[steps] * 4[duration]) / 64[PWM periods/s] = 4 second breath cycle
+ *
+ * http://www.wolframalpha.com/input/?i=%28sin%28+x%2F64*pi%29**8+*+255%2C+x%3D0+to+63
+ * (0..63).each {|x| p ((sin(x/64.0*PI)**8)*255).to_i }
+ */
+static const uint8_t breathing_table[64] = {
+0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 4, 6, 10,
+15, 23, 32, 44, 58, 74, 93, 113, 135, 157, 179, 199, 218, 233, 245, 252,
+255, 252, 245, 233, 218, 199, 179, 157, 135, 113, 93, 74, 58, 44, 32, 23,
+15, 10, 6, 4, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+/* interrupt handler */
+OSAL_IRQ_HANDLER(TIMER_INTERRUPT_VECTOR) {
+ OSAL_IRQ_PROLOGUE();
+
+ /* Software PWM
+ * timer:1111 1111 1111 1111
+ * \_____/\/ \_______/____ count(0-255)
+ * \ \______________ duration of step(4)
+ * \__________________ index of step table(0-63)
+ */
+
+ // this works for cca 65536 irqs/sec
+ static union {
+ uint16_t row;
+ struct {
+ uint8_t count:8;
+ uint8_t duration:2;
+ uint8_t index:6;
+ } pwm;
+ } timer = { .row = 0 };
+
+ timer.row++;
+
+ // LED on
+ if (timer.pwm.count == 0) {
+ led_set(1<<USB_LED_CAPS_LOCK);
+ }
+ // LED off
+ if (timer.pwm.count == breathing_table[timer.pwm.index]) {
+ led_set(0);
+ }
+
+ /* Reset the counter */
+ RESET_COUNTER;
+
+ OSAL_IRQ_EPILOGUE();
+}
+
+#endif /* common parts for known platforms */
+
+
+#if defined(KL2x) || defined(K20x) /* platform selection: familiar Kinetis chips */
+
+/* LPTMR clock options */
+#define LPTMR_CLOCK_MCGIRCLK 0 /* 4MHz clock */
+#define LPTMR_CLOCK_LPO 1 /* 1kHz clock */
+#define LPTMR_CLOCK_ERCLK32K 2 /* external 32kHz crystal */
+#define LPTMR_CLOCK_OSCERCLK 3 /* output from OSC */
+
+/* Work around inconsistencies in Freescale naming */
+#if !defined(SIM_SCGC5_LPTMR)
+#define SIM_SCGC5_LPTMR SIM_SCGC5_LPTIMER
+#endif
+
+/* Initialise the timer */
void sleep_led_init(void) {
- // we could go the 'software way' -- just enable *some* timer
- // and go with callbacks
- // or we could go the 'hardware way' -- and use timer output to
- // pins directly
+ /* Make sure the clock to the LPTMR is enabled */
+ SIM->SCGC5 |= SIM_SCGC5_LPTMR;
+ /* Reset LPTMR settings */
+ LPTMR0->CSR = 0;
+ /* Set the compare value */
+ LPTMR0->CMR = 0; // trigger on counter value (i.e. every time)
+
+ /* Set up clock source and prescaler */
+ /* Software PWM
+ * ______ ______ __
+ * | ON |___OFF___| ON |___OFF___| ....
+ * |<-------------->|<-------------->|<- ....
+ * PWM period PWM period
+ *
+ * R interrupts/period[resolution]
+ * F periods/second[frequency]
+ * R * F interrupts/second
+ */
+
+ /* === OPTION 1 === */
+ #if 0
+ // 1kHz LPO
+ // No prescaler => 1024 irqs/sec
+ // Note: this is too slow for a smooth breathe
+ LPTMR0->PSR = LPTMRx_PSR_PCS(LPTMR_CLOCK_LPO)|LPTMRx_PSR_PBYP;
+ #endif /* OPTION 1 */
+
+ /* === OPTION 2 === */
+ #if 1
+ // nMHz IRC (n=4 on KL25Z, KL26Z and K20x; n=2 or 8 on KL27Z)
+ MCG->C2 |= MCG_C2_IRCS; // fast (4MHz) internal ref clock
+ #if defined(KL27) // divide the 8MHz IRC by 2, to have the same MCGIRCLK speed as others
+ MCG->MC |= MCG_MC_LIRC_DIV2_DIV2;
+ #endif /* KL27 */
+ MCG->C1 |= MCG_C1_IRCLKEN; // enable internal ref clock
+ // to work in stop mode, also MCG_C1_IREFSTEN
+ // Divide 4MHz by 2^N (N=6) => 62500 irqs/sec =>
+ // => approx F=61, R=256, duration = 4
+ LPTMR0->PSR = LPTMRx_PSR_PCS(LPTMR_CLOCK_MCGIRCLK)|LPTMRx_PSR_PRESCALE(6);
+ #endif /* OPTION 2 */
+
+ /* === OPTION 3 === */
+ #if 0
+ // OSC output (external crystal), usually 8MHz or 16MHz
+ OSC0->CR |= OSC_CR_ERCLKEN; // enable ext ref clock
+ // to work in stop mode, also OSC_CR_EREFSTEN
+ // Divide by 2^N
+ LPTMR0->PSR = LPTMRx_PSR_PCS(LPTMR_CLOCK_OSCERCLK)|LPTMRx_PSR_PRESCALE(7);
+ #endif /* OPTION 3 */
+ /* === END OPTIONS === */
+
+ /* Interrupt on TCF set (compare flag) */
+ nvicEnableVector(LPTMR0_IRQn, 2); // vector, priority
+ LPTMR0->CSR |= LPTMRx_CSR_TIE;
}
void sleep_led_enable(void) {
- led_set(1<<USB_LED_CAPS_LOCK);
+ /* Enable the timer */
+ LPTMR0->CSR |= LPTMRx_CSR_TEN;
}
void sleep_led_disable(void) {
- led_set(0);
+ /* Disable the timer */
+ LPTMR0->CSR &= ~LPTMRx_CSR_TEN;
}
void sleep_led_toggle(void) {
- // not working yet, state not saved anywhere currently
+ /* Toggle the timer */
+ LPTMR0->CSR ^= LPTMRx_CSR_TEN;
}
+
+#elif defined(STM32F0XX) /* platform selection: STM32F0XX */
+
+/* Initialise the timer */
+void sleep_led_init(void) {
+ /* enable clock */
+ rccEnableTIM14(FALSE); /* low power enable = FALSE */
+ rccResetTIM14();
+
+ /* prescale */
+ /* Assuming 48MHz internal clock */
+ /* getting cca 65484 irqs/sec */
+ STM32_TIM14->PSC = 733;
+
+ /* auto-reload */
+ /* 0 => interrupt every time */
+ STM32_TIM14->ARR = 3;
+
+ /* enable counter update event interrupt */
+ STM32_TIM14->DIER |= STM32_TIM_DIER_UIE;
+
+ /* register interrupt vector */
+ nvicEnableVector(STM32_TIM14_NUMBER, 2); /* vector, priority */
+}
+
+void sleep_led_enable(void) {
+ /* Enable the timer */
+ STM32_TIM14->CR1 = STM32_TIM_CR1_CEN | STM32_TIM_CR1_URS;
+ /* URS => update event only on overflow; setting UG bit disabled */
+}
+
+void sleep_led_disable(void) {
+ /* Disable the timer */
+ STM32_TIM14->CR1 = 0;
+}
+
+void sleep_led_toggle(void) {
+ /* Toggle the timer */
+ STM32_TIM14->CR1 ^= STM32_TIM_CR1_CEN;
+}
+
+
+#else /* platform selection: not on familiar chips */
+
+void sleep_led_init(void) {
+}
+
+void sleep_led_enable(void) {
+ led_set(1<<USB_LED_CAPS_LOCK);
+}
+
+void sleep_led_disable(void) {
+ led_set(0);
+}
+
+void sleep_led_toggle(void) {
+ // not implemented
+}
+
+#endif /* platform selection */
\ No newline at end of file
projects / max / tmk_keyboard.git / blobdiff