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ws2812: support high-MHz ARMv6M chips like the RP2040 #391

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merged 1 commit into from
Mar 10, 2022
Merged

ws2812: support high-MHz ARMv6M chips like the RP2040 #391

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6 changes: 4 additions & 2 deletions ws2812/gen-ws2812.go
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Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ var architectures = map[string]architectureImpl{
maxBaseCyclesT0H: 1 + 3 + 2, // shift + branch (not taken) + store
minBaseCyclesT1H: 1 + 1 + 2, // shift + branch (taken) + store
maxBaseCyclesT1H: 1 + 3 + 2, // shift + branch (taken) + store
minBaseCyclesTLD: 1 + 1 + 2, // subtraction + branch + store (in next cycle)
minBaseCyclesTLD: 1 + 2 + 2, // subtraction + branch x2 + store (in next cycle)
valueTemplate: "uint32(c) << 24",
template: `
1: @ send_bit
Expand All @@ -73,7 +73,9 @@ var architectures = map[string]architectureImpl{
str {maskClear}, {portClear} @ [2] T1H -> T1L transition
@DELAY3
subs {i}, #1 @ [1]
bne.n 1b @ [1/3] send_bit
beq.n 3f @ [1/3] end
b 1b @ [1/3] send_bit
3: @ end
`,
},
"tinygoriscv": {
Expand Down
25 changes: 15 additions & 10 deletions ws2812/ws2812-asm_cortexm.go
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Original file line number Diff line number Diff line change
Expand Up @@ -56,9 +56,10 @@ func (d Device) writeByte16(c byte) {
nop
nop
nop
nop
subs {i}, #1 @ [1]
bne.n 1b @ [1/3] send_bit
beq.n 3f @ [1/3] end
b 1b @ [1/3] send_bit
3: @ end
`, map[string]interface{}{
"value": value,
"i": 8,
Expand Down Expand Up @@ -186,9 +187,10 @@ func (d Device) writeByte48(c byte) {
nop
nop
nop
nop
subs {i}, #1 @ [1]
bne.n 1b @ [1/3] send_bit
beq.n 3f @ [1/3] end
b 1b @ [1/3] send_bit
3: @ end
`, map[string]interface{}{
"value": value,
"i": 8,
Expand Down Expand Up @@ -351,9 +353,10 @@ func (d Device) writeByte64(c byte) {
nop
nop
nop
nop
subs {i}, #1 @ [1]
bne.n 1b @ [1/3] send_bit
beq.n 3f @ [1/3] end
b 1b @ [1/3] send_bit
3: @ end
`, map[string]interface{}{
"value": value,
"i": 8,
Expand Down Expand Up @@ -638,9 +641,10 @@ func (d Device) writeByte120(c byte) {
nop
nop
nop
nop
subs {i}, #1 @ [1]
bne.n 1b @ [1/3] send_bit
beq.n 3f @ [1/3] end
b 1b @ [1/3] send_bit
3: @ end
`, map[string]interface{}{
"value": value,
"i": 8,
Expand Down Expand Up @@ -1032,9 +1036,10 @@ func (d Device) writeByte168(c byte) {
nop
nop
nop
nop
subs {i}, #1 @ [1]
bne.n 1b @ [1/3] send_bit
beq.n 3f @ [1/3] end
b 1b @ [1/3] send_bit
3: @ end
`, map[string]interface{}{
"value": value,
"i": 8,
Expand Down