Unverified Commit 0288997c authored by Birte Kristina Friesel's avatar Birte Kristina Friesel
Browse files

lora32u4ii: add spi driver

parent b35dfb3f

include/arch/lora32u4ii/driver/spi.h

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#pragma once



class SPI {

	private:

		SPI(const SPI &copy);



	public:

		SPI () {}

		signed char setup();

		signed char xmit(

				unsigned char tx_len, unsigned char *tx_buf,

				unsigned char rx_len, unsigned char *rx_buf);

};



extern SPI spi;

src/arch/lora32u4ii/Kconfig

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@@ -14,6 +14,10 @@ config arch_lora32u4ii_driver_adc 
bool "ADC (Analog-Digital-Converter)"

select meta_driver_adc



config arch_lora32u4ii_driver_spi

bool "SPI"

select meta_driver_spi



config arch_lora32u4ii_driver_uptime

bool "Uptime Counter"

select meta_driver_uptime

src/arch/lora32u4ii/Makefile.inc

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@@ -48,12 +48,20 @@ ifneq ($(findstring adc,${arch_drivers}), ) 
	CONFIG_arch_lora32u4ii_driver_adc = y

endif



ifneq ($(findstring spi,${arch_drivers}), )

	CONFIG_arch_lora32u4ii_driver_spi = y

endif



# Kconfig driver selection



ifdef CONFIG_arch_lora32u4ii_driver_adc

	CXX_TARGETS += src/arch/lora32u4ii/driver/adc.cc

endif



ifdef CONFIG_arch_lora32u4ii_driver_spi

	CXX_TARGETS += src/arch/lora32u4ii/driver/spi.cc

endif



ifdef CONFIG_arch_lora32u4ii_driver_uptime

	COMMON_FLAGS += -DTIMER_S

	CXX_TARGETS += src/arch/lora32u4ii/driver/uptime.cc

src/arch/lora32u4ii/driver/spi.cc

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#include "driver/spi.h"

#include "driver/gpio.h"

#include "arch.h"

#include <avr/io.h>



signed char SPI::setup()

{

	// configure SS as output to avoid unintened switches to slave mode

	gpio.output(GPIO::pb0, 0);

	// MISO is automatically configured as input

	// Configure SCK and MOSI as output

	DDRB |= _BV(PB2) | _BV(PB1);

	// up to 2 MHz SPI clock

	SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPR0);

}



signed char SPI::xmit(

		unsigned char tx_len, unsigned char *tx_buf,

		unsigned char rx_len, unsigned char *rx_buf)

{

	unsigned char i = 0;



	while ((i < tx_len) || (i < rx_len)) {

		if (i < tx_len) {

			SPDR = tx_buf[i];

		} else {

			SPDR = 0;

		}

		arch.delay_ms(1);

		while (!(SPSR & _BV(SPIF))) ;

		if (i < rx_len) {

			rx_buf[i] = SPDR;

		}

		i++;

	}

	return 0;

}



SPI spi;