Avoid compiler optimising out register writes

Precautionary change to avoid potential issues in future developments and during debug

Avoid compiler optimising out register writes
Precautionary change to avoid potential issues in future developments and during debug
e829dcac · Bodmer · GitHub · 25362ee8 · e829dcac
Unverified Commit e829dcac authored Jan 27, 2021 by Bodmer Committed by GitHub Jan 27, 2021
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Processors/TFT_eSPI_ESP32.c Processors/TFT_eSPI_ESP32.c +2 -2

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--- a/Processors/TFT_eSPI_ESP32.c
+++ b/Processors/TFT_eSPI_ESP32.c
@@ -31,8 +31,8 @@
  volatile uint32_t* _spi_cmd       = (volatile uint32_t*)(SPI_CMD_REG(SPI_PORT));
  volatile uint32_t* _spi_user      = (volatile uint32_t*)(SPI_USER_REG(SPI_PORT));
  // Register writes only:
-           uint32_t* _spi_mosi_dlen =          (uint32_t*)(SPI_MOSI_DLEN_REG(SPI_PORT));
-           uint32_t* _spi_w         =          (uint32_t*)(SPI_W0_REG(SPI_PORT));
+  volatile uint32_t* _spi_mosi_dlen = (volatile uint32_t*)(SPI_MOSI_DLEN_REG(SPI_PORT));
+  volatile uint32_t* _spi_w         = (volatile uint32_t*)(SPI_W0_REG(SPI_PORT));
 #endif

 ////////////////////////////////////////////////////////////////////////////////////////