de52b57041
Vendored and trimmed from microsoft/uf2-samdx1, adapted to the actual ATSAMD21G17D (128 KiB flash / 16 KiB RAM), fixing the flash/RAM-size mismatch that the previously commented-out SAM-BA bootloader target had (it assumed a 256 KiB SAMD21G18A). Builds as a standalone PlatformIO environment (bootloader/platformio.ini), no python2/make dependency. Compiles clean, fits in the 8 KiB bootloader region (7292/8192 bytes). Not yet flashed/verified on real hardware.
92 lines
3.4 KiB
C
92 lines
3.4 KiB
C
#ifndef DEVICE_NEOPIXEL_H
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#define DEVICE_NEOPIXEL_H
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#ifdef BOARD_NEOPIXEL_PIN
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// The timings are taken from Adafruit's NeoPixel library
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static void neopixel_send_buffer_core(volatile uint32_t *clraddr, uint32_t pinMask,
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const uint8_t *ptr, int numBytes) __attribute__((naked));
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static void neopixel_send_buffer_core(volatile uint32_t *clraddr, uint32_t pinMask,
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const uint8_t *ptr, int numBytes) {
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asm volatile(" push {r4, r5, r6, lr};"
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" add r3, r2, r3;"
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"loopLoad:"
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" ldrb r5, [r2, #0];" // r5 := *ptr
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" add r2, #1;" // ptr++
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" movs r4, #128;" // r4-mask, 0x80
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"loopBit:"
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" str r1, [r0, #4];" // set
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#ifdef SAMD21
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" movs r6, #3; d2: sub r6, #1; bne d2;" // delay 3
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#endif
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#ifdef SAMD51
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" movs r6, #3; d2: subs r6, #1; bne d2;" // delay 3
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#endif
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" tst r4, r5;" // mask&r5
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" bne skipclr;"
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" str r1, [r0, #0];" // clr
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"skipclr:"
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#ifdef SAMD21
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" movs r6, #6; d0: sub r6, #1; bne d0;" // delay 6
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#endif
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#ifdef SAMD51
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" movs r6, #6; d0: subs r6, #1; bne d0;" // delay 6
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#endif
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" str r1, [r0, #0];" // clr (possibly again, doesn't matter)
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#ifdef SAMD21
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" asr r4, r4, #1;" // mask >>= 1
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#endif
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#ifdef SAMD51
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" asrs r4, r4, #1;" // mask >>= 1
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#endif
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" beq nextbyte;"
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" uxtb r4, r4;"
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#ifdef SAMD21
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" movs r6, #2; d1: sub r6, #1; bne d1;" // delay 2
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#endif
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#ifdef SAMD51
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" movs r6, #2; d1: subs r6, #1; bne d1;" // delay 2
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#endif
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" b loopBit;"
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"nextbyte:"
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" cmp r2, r3;"
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" bcs stop;"
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" b loopLoad;"
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"stop:"
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" pop {r4, r5, r6, pc};"
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"");
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}
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// this assumes the pin has been configured correctly
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static inline void neopixel_send_buffer(const uint8_t *ptr, int numBytes) {
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uint8_t portNum = BOARD_NEOPIXEL_PIN / 32;
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uint32_t pinMask = 1ul << (BOARD_NEOPIXEL_PIN % 32);
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PINOP(BOARD_NEOPIXEL_PIN, DIRSET);
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#if (USB_VID == 0x239a) && (USB_PID == 0x0013) // Adafruit Metro M0
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// turn off mux too, needed for metro m0
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PORT->Group[BOARD_NEOPIXEL_PIN / 32].PINCFG[BOARD_NEOPIXEL_PIN % 32].reg =
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(uint8_t)(PORT_PINCFG_INEN);
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#endif
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PINOP(BOARD_NEOPIXEL_PIN, OUTCLR);
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delay(1);
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volatile uint32_t *clraddr = &PORT->Group[portNum].OUTCLR.reg;
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// equivalent to cpu_irq_is_enabled()
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if (__get_PRIMASK() == 0) {
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__disable_irq();
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neopixel_send_buffer_core(clraddr, pinMask, ptr, numBytes);
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__enable_irq();
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} else {
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neopixel_send_buffer_core(clraddr, pinMask, ptr, numBytes);
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}
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}
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#endif
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#endif
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