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ws2812: add support for 160MHz cortex-m processors
This adds hardware timing support for driving WS2812 LEDs on Cortex-M microcontrollers running at 160MHz (such as the STM32U585). - Updated `go:generate` directive to include 160MHz. - Generated the corresponding `ws2812_writeByte160` assembly routine. - Added a switch case in `WriteByte` to handle generic 160MHz processors. Signed-off-by: deadprogram <ron@hybridgroup.com>
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Lines changed: 385 additions & 1 deletion

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‎ws2812/ws2812-asm_cortexm.go‎

Lines changed: 381 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1281,6 +1281,377 @@ void ws2812_writeByte150(char c, uint32_t *portSet, uint32_t *portClear, uint32_
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[portClear]"m"(*portClear));
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}
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__attribute__((always_inline))
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void ws2812_writeByte160(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
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// Timings:
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// T0H: 56 - 58 cycles or 350.0ns - 362.5ns
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// T1H: 168 - 170 cycles or 1050.0ns - 1062.5ns
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// TLD: 184 - cycles or 1150.0ns -
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uint32_t value = (uint32_t)c << 24;
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char i = 8;
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__asm__ __volatile__(
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"1: @ send_bit\n"
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"\t str %[maskSet], %[portSet] @ [2] T0H and T0L start here\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t lsls %[value], #1 @ [1]\n"
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"\t bcs.n 2f @ [1/3] skip_store\n"
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"\t str %[maskClear], %[portClear] @ [2] T0H -> T0L transition\n"
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"\t2: @ skip_store\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t str %[maskClear], %[portClear] @ [2] T1H -> T1L transition\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t nop\n"
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"\t subs %[i], #1 @ [1]\n"
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"\t beq.n 3f @ [1/3] end\n"
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"\t b 1b @ [1/3] send_bit\n"
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"\t3: @ end\n"
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: [value]"+r"(value),
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[i]"+r"(i)
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: [maskSet]"r"(maskSet),
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[portSet]"m"(*portSet),
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[maskClear]"r"(maskClear),
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[portClear]"m"(*portClear));
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}
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__attribute__((always_inline))
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void ws2812_writeByte168(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
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// Timings:
@@ -2192,6 +2563,16 @@ func (d Device) writeByte150(c byte) {
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interrupt.Restore(mask)
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}
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func (d Device) writeByte160(c byte) {
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portSet, maskSet := d.Pin.PortMaskSet()
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portClear, maskClear := d.Pin.PortMaskClear()
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mask := interrupt.Disable()
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C.ws2812_writeByte160(C.char(c), (*C.uint32_t)(unsafe.Pointer(portSet)), (*C.uint32_t)(unsafe.Pointer(portClear)), C.uint32_t(maskSet), C.uint32_t(maskClear))
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interrupt.Restore(mask)
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}
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func (d Device) writeByte168(c byte) {
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portSet, maskSet := d.Pin.PortMaskSet()
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portClear, maskClear := d.Pin.PortMaskClear()

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