From 79c186f5c962b514cde21415d7a262cfdbddbd97 Mon Sep 17 00:00:00 2001
From: Reinhard Feger <47209718+rf-eng@users.noreply.github.com>
Date: Sat, 22 Aug 2020 18:48:21 +0200
Subject: [PATCH] stm32/spi: Fix baudrate calculation for H7 series.

Fixes issue #6342.
---
 ports/stm32/spi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ports/stm32/spi.c b/ports/stm32/spi.c
index 07374d7a38..f8ab791898 100644
--- a/ports/stm32/spi.c
+++ b/ports/stm32/spi.c
@@ -633,7 +633,11 @@ void spi_print(const mp_print_t *print, const spi_t *spi_obj, bool legacy) {
     if (spi->State != HAL_SPI_STATE_RESET) {
         if (spi->Init.Mode == SPI_MODE_MASTER) {
             // compute baudrate
+            #if defined(STM32H7)
+            uint log_prescaler = (spi->Init.BaudRatePrescaler >> 28) + 1;
+            #else
             uint log_prescaler = (spi->Init.BaudRatePrescaler >> 3) + 1;
+            #endif
             uint baudrate = spi_get_source_freq(spi) >> log_prescaler;
             if (legacy) {
                 mp_printf(print, ", SPI.MASTER");