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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/**
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* cc2420_spi.c - Implementation of SPI cc2420 functions.
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* Copyright (C) 2013 Milan Babel <babel@inf.fu-berlin.de>
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*
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* This source code is licensed under the GNU Lesser General Public License,
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* Version 2. See the file LICENSE for more details.
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*/
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#include "cc2420_spi.h"
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#include "cc2420_arch.h"
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#include "cc2420_settings.h"
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#include "irq.h"
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/* reg */
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void cc2420_write_reg(uint8_t addr, uint16_t value) {
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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cc2420_txrx(addr | CC2420_WRITE_ACCESS);
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cc2420_txrx((uint8_t) (value >> 8));
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cc2420_txrx((uint8_t) (value & 0xFF));
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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}
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uint16_t cc2420_read_reg(uint8_t addr) {
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uint16_t result;
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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cc2420_txrx(addr | CC2420_READ_ACCESS);
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result = cc2420_txrx(NOBYTE);
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result = result << 8;
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result = cc2420_txrx(NOBYTE);
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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return result;
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}
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uint8_t cc2420_strobe(uint8_t c) {
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uint8_t result;
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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result = cc2420_txrx(c);
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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return result;
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}
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/* ram */
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uint16_t cc2420_read_ram(uint16_t addr, uint8_t* buffer, uint16_t len) {
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uint16_t i;
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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cc2420_txrx(CC2420_RAM_ACCESS | (addr & 0x7F));
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cc2420_txrx(((addr >> 1) & 0xC0) | CC2420_RAM_READ_ACCESS);
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for (i = 0; i < len; i++) {
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buffer[i] = cc2420_txrx(NOBYTE);
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}
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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return i;
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}
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uint16_t cc2420_write_ram(uint16_t addr, uint8_t* buffer, uint16_t len) {
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uint16_t i;
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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cc2420_txrx(CC2420_RAM_ACCESS | (addr & 0x7F));
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cc2420_txrx(((addr >> 1) & 0xC0) | CC2420_RAM_WRITE_ACCESS);
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for (i = 0; i < len; i++) {
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cc2420_txrx(buffer[i]);
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}
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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return i;
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}
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/* fifo */
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uint16_t cc2420_write_fifo(uint8_t* data, uint16_t data_length) {
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uint16_t i;
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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cc2420_txrx(CC2420_REG_TXFIFO | CC2420_WRITE_ACCESS);
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for (i = 0; i < data_length; i++) {
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cc2420_txrx(data[i]);
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}
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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return i;
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}
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uint16_t cc2420_read_fifo(uint8_t* data, uint16_t data_length) {
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uint16_t i;
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unsigned int cpsr = disableIRQ();
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cc2420_spi_select();
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cc2420_txrx(CC2420_REG_RXFIFO | CC2420_READ_ACCESS);
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for (i = 0; i < data_length; i++) {
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data[i] = cc2420_txrx(NOBYTE);
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}
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cc2420_spi_unselect();
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restoreIRQ(cpsr);
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return i;
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}
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