cc1120-mkl25z-rf-arch.c

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/* 
 * Copyright (c) 2014, University of Southampton, Electronics and Computer Science
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 */                             

 /**
 * \file
 *         Architecture specific CC1120 functions for the FRDM-KL25Z-RF
 * \author
 *         Graeme Bragg <g.bragg@ecs.soton.ac.uk>
 *         Phil Basford <pjb@ecs.soton.ac.uk>
 */

#include "derivative.h"
#include "cc1120.h"
#include "cc1120-arch.h"
#include "cc1120-const.h"

#include "cpu.h"
#include "spi.h"
#include "nvic.h"
#include "gpio.h"

#include <stdio.h>
#include <watchdog.h>

#define READ_BIT 0x80
#define TEST_VALUE 0xA5


#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif

static uint8_t enabled;

/* Busy Wait for time-outable waiting. */
#define BUSYWAIT_UNTIL(cond, max_time)                                  \
  do {                                                                  \
    rtimer_clock_t t0;                                                  \
    t0 = RTIMER_NOW();                                                  \
    while(!(cond) && RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (max_time)));   \
  } while(0)


/* ---------------------------- Init Functions ----------------------------- */
/*---------------------------------------------------------------------------*/

void
cc1120_arch_init(void)
{
        PRINTF("\n\rConfigure CC1120 (arch)...\n\r");   
        /* Configure pins.  This may have already been done but func is repeat-execution safe. */
        PRINTF("\tRadio Control Pins\n\r");
        cc1120_arch_pin_init();
        
        /* Init SPI.  May have already done but we need to ensure SPI is configured.*/
        PRINTF("\tSPI...\n\r");
        SPI0_init();                    /* Configure SPI with CSn. */


        /* Configure GPIO Input pins */
        PRINTF("\tGPIO Pins...\n\r");
        gpio_set_input(CC1120_GPIO2_GPIO, port_pin_to_mask(CC1120_GPIO2_PIN));                                          /* Set Pin A12 as input for GPIO2 */
        port_conf_pin(CC1120_GPIO2_PORT, CC1120_GPIO2_PIN, (PORT_PCR_MUX_GPIO | PORT_PCR_ISF_MASK));/* Set Pin A12 to be GPIO. */

        gpio_set_input(CC1120_GPIO3_GPIO, port_pin_to_mask(CC1120_GPIO3_PIN));                                          /* Set Pin A13 as input for GPIO3 */
        port_conf_pin(CC1120_GPIO3_PORT, CC1120_GPIO3_PIN, (PORT_PCR_MUX_GPIO | PORT_PCR_ISF_MASK));/* Set Pin A13 to be GPIO. */

        
        PRINTF("\tRadio Interrupt...\n\r");
        
        gpio_set_input(CC1120_INT_GPIO, port_pin_to_mask(CC1120_INT_PIN));                                                      /* Set Pin A5 as input for GPIO0 */
        port_conf_pin(CC1120_INT_PORT, CC1120_INT_PIN, (PORT_PCR_MUX_GPIO | PORT_PCR_ISF_MASK));        /* Set Pin A5 to be GPIO. */
                                  
        port_register_callback(&cc1120_interrupt_handler, CC1120_INT_PORT, CC1120_INT_PIN);                     /* Register callback. */
        port_conf_pin_int_disable(CC1120_GPIO0_PORT, CC1120_GPIO0_PIN);                                                         /* Disable interrupt for now. */
        
    PRINTF("\tOK!\n\r");                                    

}

/*---------------------------------------------------------------------------*/

void 
cc1120_arch_pin_init(void)
{
        /* Configure CSn pin on Port D, Pin 0 */
        gpio_set_output(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));                                             /* Set pin as Output.*/ 
        port_conf_pin(CC1120_CSn_PORT, CC1120_CSn_PIN, (PORT_PCR_MUX_GPIO | PORT_PCR_ISF_MASK));/* Clear ISF & set MUX to be basic pin. */
        enabled = 0;

        /* Configure CC1120 Reset pin on Port B, Pin 8. */
        gpio_set_output(CC1120_RST_GPIO, port_pin_to_mask(CC1120_RST_PIN));                                             /* Set pin as Output.*/ 
        port_conf_pin(CC1120_RST_PORT, CC1120_RST_PIN, (PORT_PCR_MUX_GPIO | PORT_PCR_ISF_MASK));/* Clear ISF & set MUX to be basic pin. */

        /* Configure C17 to read MISO. */
        gpio_set_input(CC1120_CSnCHK_GPIO, port_pin_to_mask(CC1120_CSnCHK_PIN));                                                /* Set pin C17 as Input.*/
        port_conf_pin(CC1120_CSnCHK_PORT, CC1120_CSnCHK_PIN, (PORT_PCR_MUX_GPIO | PORT_PCR_ISF_MASK));  /* Clear ISF & set MUX to be basic pin. */

        gpio_set_pin(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));                                                /* Make sure that the CSn is set HIGH. */
        gpio_set_pin(CC1120_RST_GPIO, port_pin_to_mask(CC1120_RST_PIN));                                                /* Make sure that the Reset is set HIGH. */
}


/* ---------------------------- Reset Functions ---------------------------- */
void
cc1120_arch_reset(void)
{
        cc1120_arch_spi_disable();
        gpio_set_pin(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));        /* Assert CSn to de-select CC1120. */
        gpio_clr_pin(CC1120_RST_GPIO, port_pin_to_mask(CC1120_RST_PIN));        /* Clear !Reset pin. */
        clock_delay(CC1120_RESET_DELAY_USEC/100);                                                       /* Delay for a little. */
        gpio_set_pin(CC1120_RST_GPIO, port_pin_to_mask(CC1120_RST_PIN));        /* Assert !Reset pin. */
        enabled = 0;
}


/* ----------------------------- SPI Functions ----------------------------- */
uint8_t
cc1120_arch_spi_enabled(void)
{
        return enabled;
}

void
cc1120_arch_spi_enable(void)
{
        if(!enabled)
        {
                rtimer_clock_t t0 = RTIMER_NOW(); 
                int i = 0;
                        
                gpio_clr_pin(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));        /* Set CSn to low to select CC1120 */
                
                watchdog_periodic();

                /* The MISO pin should go LOW before chip is fully enabled. */
                while(gpio_read_pin(CC1120_CSnCHK_GPIO, port_pin_to_mask(CC1120_CSnCHK_PIN)))
                {
                        if(RTIMER_CLOCK_LT((t0 + CC1120_EN_TIMEOUT), RTIMER_NOW()) )
                        {
                                watchdog_periodic();
                                if(i == 0)
                                {
                                        /* Timeout.  Try a SNOP and a re-enable once. */
                                        (void) cc1120_arch_spi_rw_byte(CC1120_STROBE_SNOP);                                     /* SNOP. */
                                        gpio_set_pin(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));        /* Disable. */
                                        clock_wait(50);                                                                                                         /* Wait. */
                                        gpio_clr_pin(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));        /* Enable. */
                                        
                                        i++;
                                }
                                else
                                {
                                        printf("Radio Barf");
                                        break;
                                }
                                
                                t0 = RTIMER_NOW();              /* Reset timeout. */
                        }
                }
                
                enabled = 1;
        }
}

/*---------------------------------------------------------------------------*/
void
cc1120_arch_spi_disable(void)
{
        /* Set CSn to high (1) */
        gpio_set_pin(CC1120_CSn_GPIO, port_pin_to_mask(CC1120_CSn_PIN));
        enabled = 0;
}

/*---------------------------------------------------------------------------*/
uint8_t
cc1120_arch_spi_rw_byte(uint8_t val)
{
        return SPI_single_tx_rx(val, 0);
}

/*---------------------------------------------------------------------------*/
uint8_t 
cc1120_arch_txfifo_load(uint8_t *packet, uint8_t packet_length)
{
        uint8_t status, i;
        //status = cc1120_arch_spi_rw_byte(CC1120_FIFO_ACCESS | CC1120_STANDARD_BIT | CC1120_WRITE_BIT);
        status = cc1120_arch_spi_rw_byte(CC1120_FIFO_ACCESS | CC1120_BURST_BIT | CC1120_WRITE_BIT);
        cc1120_arch_spi_rw_byte(packet_length);
        
        for(i = 0; i < packet_length; i++)
        {
                cc1120_arch_spi_rw_byte(packet[i]);
        }
        
        return status;
}


/*---------------------------------------------------------------------------*/
void 
cc1120_arch_rxfifo_read(uint8_t *packet, uint8_t packet_length)
{
        uint8_t i;
        
        (void) cc1120_arch_spi_rw_byte(CC1120_FIFO_ACCESS | CC1120_BURST_BIT | CC1120_READ_BIT);
        
        for(i = 0; i < packet_length; i++)
        {
                packet[i] = cc1120_arch_spi_rw_byte(0);
        }
        watchdog_periodic();
}


/*---------------------------------------------------------------------------*/
uint8_t 
cc1120_arch_read_cca(void)
{
        /*if(CC1120_GDO3_PORT(IN) & BV(CC1120_GDO3_PIN))
        {
                return 1;
        }
        else
        {*/
                return 0;
        //}
}


uint8_t
cc1120_arch_read_gpio2(void)
{
                return 0;
}

/*---------------------------------------------------------------------------*/
uint8_t
cc1120_arch_read_gpio3(void)
{
        if(gpio_read_pin(CC1120_GPIO3_GPIO,port_pin_to_mask(CC1120_GPIO3_PIN)))
        {
                return 1;
        }
        else
        {
                return 0;
        }
}

/* -------------------------- Interrupt Functions -------------------------- */

void
cc1120_arch_interrupt_enable(void)
{
        /* Reset interrupt trigger */
        port_pin_clr_isf(CC1120_INT_PORT, CC1120_INT_PIN);
        
        port_conf_pin_int_rise(CC1120_INT_PORT, CC1120_INT_PIN);

}

/*---------------------------------------------------------------------------*/
void
cc1120_arch_interrupt_disable(void)
{
        /* Disable interrupt on the GDO0 pin */
        port_conf_pin_int_disable(PORTA, 5);
}
/*---------------------------------------------------------------------------*/
void
cc1120_arch_interrupt_acknowledge(void)
{
        /* Reset interrupt trigger */
        port_pin_clr_isf(CC1120_INT_PORT, CC1120_INT_PIN);
        
        if(SPI0_S & SPI_S_SPRF_MASK) {                                  /* If there is stray data in the SPI data register, discard it. */
                (void)SPI0_D;
        }
}