From 8b0146c142cab3028fe2a2ebbc87196c4d2e087f Mon Sep 17 00:00:00 2001
From: aizaki77 <156364565+aizaki77@users.noreply.github.com>
Date: Thu, 27 Jun 2024 23:28:46 +0900
Subject: [PATCH] Fixed an issue that caused incorrect settings when the SPI
clock was less than 244141Hz. (#1633)
---
src/rp2_common/hardware_spi/spi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/rp2_common/hardware_spi/spi.c b/src/rp2_common/hardware_spi/spi.c
index 035a710..d20c1dc 100644
--- a/src/rp2_common/hardware_spi/spi.c
+++ b/src/rp2_common/hardware_spi/spi.c
@@ -51,7 +51,7 @@ uint spi_set_baudrate(spi_inst_t *spi, uint baudrate) {
// Find smallest prescale value which puts output frequency in range of
// post-divide. Prescale is an even number from 2 to 254 inclusive.
for (prescale = 2; prescale <= 254; prescale += 2) {
- if (freq_in < (prescale + 2) * 256 * (uint64_t) baudrate)
+ if (freq_in < prescale * 256 * (uint64_t) baudrate)
break;
}
invalid_params_if(SPI, prescale > 254); // Frequency too low
--
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