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rp2040: fix max SPI frequency

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I think the previous numbers came from an older revision of the
datasheet? They're certainly not in the current revision, which gives
62.5MHz as the maximum speed.
This commit is contained in:
Ayke van Laethem
2023-03-31 23:27:43 +02:00
parent 50d681359d
commit d74a132735
1 changed files with 1 additions and 1 deletions
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src/machine/machine_rp2040_spi.go
+1 -1
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@@ -114,7 +114,7 @@ func (spi SPI) Transfer(w byte) (byte, error) {
func (spi SPI) SetBaudRate(br uint32) error {
const freqin uint32 = 125 * MHz
const maxBaud uint32 = 66.5 * MHz // max output frequency is 66.5MHz on rp2040. see Note page 527.
const maxBaud uint32 = 62.5 * MHz // max output frequency is 62.5MHz on rp2040, see page 507
// Find smallest prescale value which puts output frequency in range of
// post-divide. Prescale is an even number from 2 to 254 inclusive.
var prescale, postdiv uint32