diff options
Diffstat (limited to 'tmk_core/common/chibios/sleep_led.c')
| -rw-r--r-- | tmk_core/common/chibios/sleep_led.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/tmk_core/common/chibios/sleep_led.c b/tmk_core/common/chibios/sleep_led.c new file mode 100644 index 000000000..4c35cfcba --- /dev/null +++ b/tmk_core/common/chibios/sleep_led.c @@ -0,0 +1,226 @@ +#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) { + /* 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) { + /* Enable the timer */ + LPTMR0->CSR |= LPTMRx_CSR_TEN; +} + +void sleep_led_disable(void) { + /* Disable the timer */ + LPTMR0->CSR &= ~LPTMRx_CSR_TEN; +} + +void sleep_led_toggle(void) { + /* 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 */
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