diff --git a/ked/csl/stm32f042/Src/spi.c b/ked/csl/stm32f042/Src/spi.c
index 05af6c0..7de72d1 100644
--- a/ked/csl/stm32f042/Src/spi.c
+++ b/ked/csl/stm32f042/Src/spi.c
@@ -1,12 +1,28 @@
 #include "spi.h"
 
+// https://controllerstech.com/spi-using-registers-in-stm32/
 
 void spi_initMater(spiCH_t_spi_hw_ch)
 {
-
+	RCC->APB2ENR |= (1<<12);  // Enable SPI1 CLock
+	
+	SPI1->CR1 |= (1<<0)|(1<<1);   // CPOL=1, CPHA=1
+	
+    SPI1->CR1 |= (1<<2);  // Master Mode
+		
+	SPI1->CR1 |= (3<<3);  // BR[2:0] = 011: fPCLK/16, PCLK2 = 80MHz, SPI clk = 5MHz
+		
+	SPI1->CR1 &= ~(1<<7);  // LSBFIRST = 0, MSB first
+			
+	SPI1->CR1 |= (1<<8) | (1<<9);  // SSM=1, SSi=1 -> Software Slave Management
+			
+	SPI1->CR1 &= ~(1<<10);  // RXONLY = 0, full-duplex
+				
+	SPI1->CR1 &= ~(1<<11);  // DFF=0, 8 bit data
+				
+	SPI1->CR2 = 0;
 }
 
-
 uint8_t spi_trx(spiCH_t_spi_hw_ch, uint8_t tx_data)
 {
 	return 0;