working better example of alternating On Off Frame test with MAX7219

ked/csl/stm32f042/Src/imp_spi.c

@@ -157,6 +157,8 @@ uint8_t spiTrx(spiCH_t spi_hw_ch, uint8_t tx_data)
 	
 	//SPI1->DR = tx_data;  // send data
 	
+
+	// this masking must be done. otherwise 16bits frame will be used
 	*(uint8_t*)&(SPI_BASE->DR) = tx_data;
 
 	// Wait for RXNE to set -> This will indicate that the Rx buffer is not empty

main.c

@@ -11,27 +11,29 @@ void max7219_test_display(spi_ch_t* spi_ch)
 {
 	// set mode to display test
 	
-
+/*
 	pinWrite(spi_ch->pin, 0);
 	spiTrx(spi_ch->spi, 0x0F);
-	spiTrx(spi_ch->spi, 0x00);
+	spiTrx(spi_ch->spi, 0x01);
 	pinWrite(spi_ch->pin,1);
-		
+*/
-	//spiWrite16bit(spi_ch, 0x0C01);
+	spiWriteReg(spi_ch,0x0F,0x01);
+
+//	spiWrite16bit(spi_ch, 0x0F01);
 	//delayMs(50);
 //	spiWrite16bit(spi_ch, 0x0F01);
 	delayMs(1000);
-
+/*
 	pinWrite(spi_ch->pin, 0);
-	spiTrx(spi_ch->spi, 0x0C);
+	spiTrx(spi_ch->spi, 0x0F);
-	spiTrx(spi_ch->spi, 0x01);
+	spiTrx(spi_ch->spi, 0x00);
 	pinWrite(spi_ch->pin,1);
-	
+*/	
 	
 	// set mode to shutdown
-//	spiWrite16bit(spi_ch, 0x0C00);
+	spiWrite16bit(spi_ch, 0x0F00);
 	delayMs(1000);
-
+/*
 	pinWrite(spi_ch->pin, 0);
 	spiTrx(spi_ch->spi, 0x0C);
 	spiTrx(spi_ch->spi, 0x00);
@@ -40,7 +42,7 @@ void max7219_test_display(spi_ch_t* spi_ch)
 	
 	// set mode to shutdown
 //	spiWrite16bit(spi_ch, 0x0C00);
-	delayMs(1000);
+	delayMs(1000);*/
 }
 
 void max7219_setIntensity(spi_ch_t* spi_ch, uint8_t intensity)