From eb3029c6697007eac7a76a8bd34452cedbd2c526 Mon Sep 17 00:00:00 2001 From: Jonathan Hogg Date: Mon, 12 Jul 2021 11:35:25 +0100 Subject: [PATCH] esp32/machine_spi: Calculate actual attained baudrate. Calculate the actual baudrate that the hardware is capable of achieving and remember it so that printing the SPI object will show this. Fixes #7530. --- ports/esp32/machine_hw_spi.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/ports/esp32/machine_hw_spi.c b/ports/esp32/machine_hw_spi.c index 98c0abaefd..2792216cc0 100644 --- a/ports/esp32/machine_hw_spi.c +++ b/ports/esp32/machine_hw_spi.c @@ -144,9 +144,13 @@ STATIC void machine_hw_spi_init_internal( changed = true; } - if (baudrate != -1 && baudrate != self->baudrate) { - self->baudrate = baudrate; - changed = true; + if (baudrate != -1) { + // calculate the actual clock frequency that the SPI peripheral can produce + baudrate = spi_get_actual_clock(APB_CLK_FREQ, baudrate, 0); + if (baudrate != self->baudrate) { + self->baudrate = baudrate; + changed = true; + } } if (polarity != -1 && polarity != self->polarity) {