0069-check-MISO-correctness-only-if-it-is-declared.patch

From 9806b6cf13f2c7ac60335baac8e83601cfdec78e Mon Sep 17 00:00:00 2001
From: Josep Comas <extern@jcomas.net>
Date: Sat, 31 Jul 2021 18:57:41 +0200
Subject: [PATCH 069/110] check MISO correctness only if it is declared

It is very common  to have displays without MISO pin connected to MCU, for example, https://www.waveshare.com/pico-lcd-1.3.htm hangs calling spi_init(&spi, p11, NC, p10, NC);
---
 targets/TARGET_RASPBERRYPI/TARGET_RP2040/spi_api.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/targets/TARGET_RASPBERRYPI/TARGET_RP2040/spi_api.c b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/spi_api.c
index 73129835fa..271cf58d1c 100644
--- a/targets/TARGET_RASPBERRYPI/TARGET_RP2040/spi_api.c
+++ b/targets/TARGET_RASPBERRYPI/TARGET_RP2040/spi_api.c
@@ -26,8 +26,10 @@ void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel
     SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
     SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
 
-    MBED_ASSERT(spi_mosi == spi_miso);
-    MBED_ASSERT(spi_miso == spi_sclk);
+    if (spi_miso != (SPIName)NC) {
+        MBED_ASSERT(spi_mosi == spi_miso);
+        MBED_ASSERT(spi_miso == spi_sclk);
+    }
     if (spi_ssel != (SPIName)NC) {
         MBED_ASSERT(spi_sclk == spi_ssel);
     }
-- 
2.34.1