fix comment

lib/led_max7219.c

@@ -183,7 +183,7 @@ void led_max7219_setup(void)
 	rcc_periph_clock_enable(RCC_AFIO); // enable clock for SPI alternate function
 	rcc_periph_clock_enable(RCC_SPI(LED_MAX7219_SPI)); // enable clock for SPI peripheral
 	spi_reset(SPI(LED_MAX7219_SPI)); // clear SPI values to default
-	spi_init_master(SPI(LED_MAX7219_SPI), SPI_CR1_BAUDRATE_FPCLK_DIV_16, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE, SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_16BIT, SPI_CR1_MSBFIRST); // initialise SPI as master, divide clock by 8 since max MAX7219 clock is 10 MHz and max SPI PCLK clock is 72 Mhz, depending on which SPI is used, set clock polarity to idle high (polarity is not really important for the MAX7219), set clock phase to go high when bit is set (depends on polarity) as data is stored on MAX7219 on rising edge), use 16 bits frames (as used by MAX7219), use MSB first
+	spi_init_master(SPI(LED_MAX7219_SPI), SPI_CR1_BAUDRATE_FPCLK_DIV_16, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE, SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_16BIT, SPI_CR1_MSBFIRST); // initialise SPI as master, divide clock by 8 since max MAX7219 clock is 10 MHz and max SPI PCLK clock is 72 Mhz, depending on which SPI is used, set clock polarity to idle low (as in the datasheet of the MAX7219, but not that important), set clock phase to go high when bit is set (depends on polarity) as data is stored on MAX7219 on rising edge), use 16 bits frames (as used by MAX7219), use MSB first
 	spi_set_unidirectional_mode(SPI(LED_MAX7219_SPI)); // we only need to transmit data
 	spi_enable(SPI(LED_MAX7219_SPI)); // enable SPI