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ws2812: support thingplus-rp2040 board

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Added 125 MHz rp2040 timing
  Added unsafe.Pointer for pointer conversion
This commit is contained in:
Olaf Flebbe
2022-04-30 23:45:28 +02:00
committed by Ron Evans
parent 3bdab45452
commit df0d0d29a4
7 changed files with 335 additions and 11 deletions
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ws2812/ws2812-asm_cortexm.go
+311 -5
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@@ -7,6 +7,7 @@ package ws2812
// gen-ws2812.go and run "go generate".
import "runtime/interrupt"
import "unsafe"
/*
#include <stdint.h>
@@ -636,6 +637,301 @@ void ws2812_writeByte120(char c, uint32_t *portSet, uint32_t *portClear, uint32_
[portClear]"m"(*portClear));
}
__attribute__((always_inline))
void ws2812_writeByte125(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings:
// T0H: 44 - 46 cycles or 352.0ns - 368.0ns
// T1H: 132 - 134 cycles or 1056.0ns - 1072.0ns
// TLD: 144 - cycles or 1152.0ns -
uint32_t value = (uint32_t)c << 24;
char i = 8;
__asm__ __volatile__(
"1: @ send_bit\n"
"\t str %[maskSet], %[portSet] @ [2] T0H and T0L start here\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t nop\n"
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"\t nop\n"
"\t nop\n"
"\t nop\n"
"\t lsls %[value], #1 @ [1]\n"
"\t bcs.n 2f @ [1/3] skip_store\n"
"\t str %[maskClear], %[portClear] @ [2] T0H -> T0L transition\n"
"\t2: @ skip_store\n"
"\t nop\n"
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"\t nop\n"
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"\t str %[maskClear], %[portClear] @ [2] T1H -> T1L transition\n"
"\t nop\n"
"\t nop\n"
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"\t subs %[i], #1 @ [1]\n"
"\t beq.n 3f @ [1/3] end\n"
"\t b 1b @ [1/3] send_bit\n"
"\t3: @ end\n"
: [value]"+r"(value),
[i]"+r"(i)
: [maskSet]"r"(maskSet),
[portSet]"m"(*portSet),
[maskClear]"r"(maskClear),
[portClear]"m"(*portClear));
}
__attribute__((always_inline))
void ws2812_writeByte168(char c, uint32_t *portSet, uint32_t *portClear, uint32_t maskSet, uint32_t maskClear) {
// Timings:
@@ -1033,7 +1329,7 @@ func (d Device) writeByte16(c byte) {
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte16(C.char(c), portSet, portClear, maskSet, maskClear)
C.ws2812_writeByte16(C.char(c), (*uint32)(unsafe.Pointer(portSet)), (*uint32)(unsafe.Pointer(portClear)), maskSet, maskClear)
interrupt.Restore(mask)
}
@@ -1043,7 +1339,7 @@ func (d Device) writeByte48(c byte) {
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte48(C.char(c), portSet, portClear, maskSet, maskClear)
C.ws2812_writeByte48(C.char(c), (*uint32)(unsafe.Pointer(portSet)), (*uint32)(unsafe.Pointer(portClear)), maskSet, maskClear)
interrupt.Restore(mask)
}
@@ -1053,7 +1349,7 @@ func (d Device) writeByte64(c byte) {
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte64(C.char(c), portSet, portClear, maskSet, maskClear)
C.ws2812_writeByte64(C.char(c), (*uint32)(unsafe.Pointer(portSet)), (*uint32)(unsafe.Pointer(portClear)), maskSet, maskClear)
interrupt.Restore(mask)
}
@@ -1063,7 +1359,17 @@ func (d Device) writeByte120(c byte) {
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte120(C.char(c), portSet, portClear, maskSet, maskClear)
C.ws2812_writeByte120(C.char(c), (*uint32)(unsafe.Pointer(portSet)), (*uint32)(unsafe.Pointer(portClear)), maskSet, maskClear)
interrupt.Restore(mask)
}
func (d Device) writeByte125(c byte) {
portSet, maskSet := d.Pin.PortMaskSet()
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte125(C.char(c), (*uint32)(unsafe.Pointer(portSet)), (*uint32)(unsafe.Pointer(portClear)), maskSet, maskClear)
interrupt.Restore(mask)
}
@@ -1073,7 +1379,7 @@ func (d Device) writeByte168(c byte) {
portClear, maskClear := d.Pin.PortMaskClear()
mask := interrupt.Disable()
C.ws2812_writeByte168(C.char(c), portSet, portClear, maskSet, maskClear)
C.ws2812_writeByte168(C.char(c), (*uint32)(unsafe.Pointer(portSet)), (*uint32)(unsafe.Pointer(portClear)), maskSet, maskClear)
interrupt.Restore(mask)
}