add neopixel support
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4f48b8b51a
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134
src/boards.c
134
src/boards.c
@ -35,6 +35,7 @@
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/**************************************************************************/
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/**************************************************************************/
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#include "boards.h"
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#include "boards.h"
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#include "nrf_pwm.h"
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#include "app_scheduler.h"
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#include "app_scheduler.h"
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#include "app_timer.h"
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#include "app_timer.h"
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@ -83,7 +84,11 @@ void board_init(void)
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// use neopixel for use enumeration
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// use neopixel for use enumeration
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#ifdef LED_NEOPIXEL
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#ifdef LED_NEOPIXEL
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extern void neopixel_init(void);
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neopixel_init();
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uint8_t grb[] = { 0, 255, 0 };
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neopixel_write(grb);
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#endif
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#endif
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// Init scheduler
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// Init scheduler
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@ -98,6 +103,11 @@ void board_teardown(void)
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// Disable and reset PWM for LED
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// Disable and reset PWM for LED
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led_pwm_teardown(LED_RED);
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led_pwm_teardown(LED_RED);
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#ifdef LED_NEOPIXEL
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extern void neopixel_teardown(void);
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neopixel_teardown();
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#endif
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led_off(LED_BLUE);
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led_off(LED_BLUE);
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led_off(LED_RED);
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led_off(LED_RED);
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@ -119,25 +129,26 @@ uint32_t tusb_hal_millis(void)
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return ( ( ((uint64_t)app_timer_cnt_get())*1000*(APP_TIMER_CONFIG_RTC_FREQUENCY+1)) / APP_TIMER_CLOCK_FREQ );
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return ( ( ((uint64_t)app_timer_cnt_get())*1000*(APP_TIMER_CONFIG_RTC_FREQUENCY+1)) / APP_TIMER_CLOCK_FREQ );
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}
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}
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void pwm_teardown(NRF_PWM_Type* pwm )
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{
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pwm->TASKS_SEQSTART[0] = 0;
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pwm->ENABLE = 0;
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pwm->PSEL.OUT[0] = 0xFFFFFFFF;
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pwm->MODE = 0;
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pwm->COUNTERTOP = 0x3FF;
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pwm->PRESCALER = 0;
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pwm->DECODER = 0;
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pwm->LOOP = 0;
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pwm->SEQ[0].PTR = 0;
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pwm->SEQ[0].CNT = 0;
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}
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void led_pwm_init(uint32_t led_pin)
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void led_pwm_init(uint32_t led_pin)
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{
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{
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NRF_PWM_Type* pwm = (led_pin == LED_RED) ? NRF_PWM0 : NRF_PWM1;
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pwm_teardown ((led_pin == LED_RED) ? NRF_PWM0 : NRF_PWM1);
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pwm->MODE = PWM_MODE_UPDOWN_UpAndDown;
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pwm->COUNTERTOP = PWM_MAXCOUNT;
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pwm->PRESCALER = PWM_PRESCALER_PRESCALER_DIV_128;
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pwm->DECODER = PWM_DECODER_LOAD_Individual;
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pwm->LOOP = 0;
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pwm->SEQ[0].PTR = (uint32_t) (led_pin == LED_RED ? _pwm_red_seq : _pwm_blue_seq);
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pwm->SEQ[0].CNT = PWM_CHANNEL_NUM; // default mode is Individual --> count must be 4
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pwm->SEQ[0].REFRESH = 0;
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pwm->SEQ[0].ENDDELAY = 0;
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pwm->PSEL.OUT[0] = led_pin;
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pwm->ENABLE = 1;
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pwm->TASKS_SEQSTART[0] = 1;
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}
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}
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void led_pwm_teardown(uint32_t led_pin)
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void led_pwm_teardown(uint32_t led_pin)
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@ -186,3 +197,92 @@ void led_red_blink_fast(bool enable)
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}
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}
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}
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}
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#if LED_NEOPIXEL
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// WS2812B (rev B) timing is 0.4 and 0.8 us
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#define MAGIC_T0H 6UL | (0x8000) // 0.375us
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#define MAGIC_T1H 13UL | (0x8000) // 0.8125us
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#define CTOPVAL 20UL // 1.25us
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#define NEO_NUMBYTE 3
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static uint16_t pixels_pattern[NEO_NUMBYTE * 8 + 2];
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void neopixel_init(void)
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{
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// To support both the SoftDevice + Neopixels we use the EasyDMA
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// feature from the NRF25. However this technique implies to
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// generate a pattern and store it on the memory. The actual
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// memory used in bytes corresponds to the following formula:
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// totalMem = numBytes*8*2+(2*2)
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// The two additional bytes at the end are needed to reset the
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// sequence.
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NRF_PWM_Type* pwm = NRF_PWM2;
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// Set the wave mode to count UP
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// Set the PWM to use the 16MHz clock
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// Setting of the maximum count
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// but keeping it on 16Mhz allows for more granularity just
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// in case someone wants to do more fine-tuning of the timing.
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nrf_pwm_configure(pwm, NRF_PWM_CLK_16MHz, NRF_PWM_MODE_UP, CTOPVAL);
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// Disable loops, we want the sequence to repeat only once
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nrf_pwm_loop_set(pwm, 0);
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// On the "Common" setting the PWM uses the same pattern for the
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// for supported sequences. The pattern is stored on half-word of 16bits
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nrf_pwm_decoder_set(pwm, PWM_DECODER_LOAD_Common, PWM_DECODER_MODE_RefreshCount);
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// The following settings are ignored with the current config.
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nrf_pwm_seq_refresh_set(pwm, 0, 0);
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nrf_pwm_seq_end_delay_set(pwm, 0, 0);
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// The Neopixel implementation is a blocking algorithm. DMA
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// allows for non-blocking operation. To "simulate" a blocking
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// operation we enable the interruption for the end of sequence
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// and block the execution thread until the event flag is set by
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// the peripheral.
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// pwm->INTEN |= (PWM_INTEN_SEQEND0_Enabled<<PWM_INTEN_SEQEND0_Pos);
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// PSEL must be configured before enabling PWM
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nrf_pwm_pins_set(pwm, (uint32_t[] ) { LED_NEOPIXEL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL });
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// Enable the PWM
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nrf_pwm_enable(pwm);
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}
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void neopixel_teardown(void)
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{
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pwm_teardown(NRF_PWM2);
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}
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// write 3 bytes color to a built-in neopixel
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void neopixel_write (uint8_t *pixels)
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{
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uint16_t pos = 0; // bit position
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for ( uint16_t n = 0; n < NEO_NUMBYTE; n++ )
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{
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uint8_t pix = pixels[n];
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for ( uint8_t mask = 0x80; mask > 0; mask >>= 1 )
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{
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pixels_pattern[pos] = (pix & mask) ? MAGIC_T1H : MAGIC_T0H;
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pos++;
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}
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}
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// Zero padding to indicate the end of sequence
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pixels_pattern[++pos] = 0 | (0x8000); // Seq end
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pixels_pattern[++pos] = 0 | (0x8000); // Seq end
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NRF_PWM_Type* pwm = NRF_PWM2;
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nrf_pwm_seq_ptr_set(pwm, 0, pixels_pattern);
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nrf_pwm_seq_cnt_set(pwm, 0, sizeof(pixels_pattern)/2);
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nrf_pwm_event_clear(pwm, NRF_PWM_EVENT_SEQEND0);
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nrf_pwm_task_trigger(pwm, NRF_PWM_TASK_SEQSTART0);
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}
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#endif
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@ -14,6 +14,7 @@
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#include <stdbool.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <string.h>
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#include "nrf_gpio.h"
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#include "nrf_gpio.h"
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#if defined BOARD_FEATHER_NRF52840_EXPRESS
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#if defined BOARD_FEATHER_NRF52840_EXPRESS
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@ -71,6 +72,10 @@ void led_pwm_enable(uint32_t led_pin);
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void led_red_blink_fast(bool enable);
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void led_red_blink_fast(bool enable);
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#ifdef LED_NEOPIXEL
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void neopixel_write(uint8_t *pixels);
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#endif
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//--------------------------------------------------------------------+
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//--------------------------------------------------------------------+
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// BUTTONS
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// BUTTONS
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//--------------------------------------------------------------------+
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//--------------------------------------------------------------------+
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@ -46,6 +46,8 @@
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#include "tusb.h"
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#include "tusb.h"
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#include "usb_desc.h"
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#include "usb_desc.h"
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#include "boards.h"
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//--------------------------------------------------------------------+
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//--------------------------------------------------------------------+
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// MACRO TYPEDEF CONSTANT ENUM DECLARATION
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// MACRO TYPEDEF CONSTANT ENUM DECLARATION
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//--------------------------------------------------------------------+
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//--------------------------------------------------------------------+
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@ -155,11 +157,17 @@ void usb_teardown(void)
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//--------------------------------------------------------------------+
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//--------------------------------------------------------------------+
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void tud_mount_cb(void)
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void tud_mount_cb(void)
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{
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{
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#ifdef LED_NEOPIXEL
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uint8_t grb[] = { 255, 0, 0 };
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neopixel_write(grb);
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#endif
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}
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}
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void tud_umount_cb(void)
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void tud_umount_cb(void)
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{
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{
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#ifdef LED_NEOPIXEL
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uint8_t grb[] = { 0, 255, 0 };
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neopixel_write(grb);
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#endif
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}
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}
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