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/*
* Copyright (C) 2015 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup cpu_lpc2387
* @{
*
* @file
* @brief Low-level SPI driver implementation
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*
* @}
*/
#include "cpu.h"
#include "mutex.h"
#include "periph/gpio.h"
#include "periph/spi.h"
#include "periph_conf.h"
#include "board.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#if SPI_0_EN
#define SPI_TX_EMPTY (SSP0SR & SSPSR_TFE)
#define SPI_BUSY (SSP0SR & SSPSR_BSY)
#define SPI_RX_AVAIL (SSP0SR & SSPSR_RNE)
/**
* @brief Array holding one pre-initialized mutex for each SPI device
*/
static mutex_t locks[] = {
#if SPI_0_EN
[SPI_0] = MUTEX_INIT,
#endif
#if SPI_1_EN
[SPI_1] = MUTEX_INIT,
#endif
#if SPI_2_EN
[SPI_2] = MUTEX_INIT
#endif
};
int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
{
(void ) conf;
if (dev) {
return -1;
}
uint32_t f_baud = 0;
switch(speed)
{
case SPI_SPEED_100KHZ:
f_baud = 100;
break;
case SPI_SPEED_400KHZ:
f_baud = 400;
break;
case SPI_SPEED_1MHZ:
f_baud = 1000;
break;
case SPI_SPEED_5MHZ:
f_baud = 5000;
break;
case SPI_SPEED_10MHZ:
f_baud = 10000;
break;
}
#if 0
/* TODO */
switch(conf)
{
case SPI_CONF_FIRST_RISING:
/**< first data bit is transacted on the first rising SCK edge */
cpha = 0;
cpol = 0;
break;
case SPI_CONF_SECOND_RISING:
/**< first data bit is transacted on the second rising SCK edge */
cpha = 1;
cpol = 0;
break;
case SPI_CONF_FIRST_FALLING:
/**< first data bit is transacted on the first falling SCK edge */
cpha = 0;
cpol = 1;
break;
case SPI_CONF_SECOND_FALLING:
/**< first data bit is transacted on the second falling SCK edge */
cpha = 1;
cpol = 1;
break;
}
#endif
/* Power*/
PCONP |= PCSSP0; /* Enable power for SSP0 (default is on)*/
/* PIN Setup*/
spi_conf_pins(dev);
/* Interface Setup*/
SSP0CR0 = 7;
/* Clock Setup*/
uint32_t pclksel;
uint32_t cpsr;
lpc2387_pclk_scale(CLOCK_CORECLOCK / 1000, f_baud, &pclksel, &cpsr);
PCLKSEL1 &= ~(BIT10 | BIT11); /* CCLK to PCLK divider*/
PCLKSEL1 |= pclksel << 10;
SSP0CPSR = cpsr;
/* Enable*/
SSP0CR1 |= BIT1; /* SSP-Enable*/
int dummy;
/* Clear RxFIFO:*/
while (SPI_RX_AVAIL) { /* while RNE (Receive FIFO Not Empty)...*/
dummy = SSP0DR; /* read data*/
}
/* to suppress unused-but-set-variable */
(void) dummy;
return 0;
}
int spi_init_slave(spi_t dev, spi_conf_t conf, char (*cb)(char))
{
(void)dev;
(void)conf;
(void)cb;
printf("%s:%s(): stub\n", RIOT_FILE_RELATIVE, __func__);
/* TODO */
return -1;
}
void spi_transmission_begin(spi_t dev, char reset_val)
{
(void)dev;
(void)reset_val;
printf("%s:%s(): stub\n", RIOT_FILE_RELATIVE, __func__);
/* TODO*/
}
int spi_acquire(spi_t dev)
{
if (dev >= SPI_NUMOF) {
return -1;
}
mutex_lock(&locks[dev]);
return 0;
}
int spi_release(spi_t dev)
{
if (dev >= SPI_NUMOF) {
return -1;
}
mutex_unlock(&locks[dev]);
return 0;
}
int spi_transfer_byte(spi_t dev, char out, char *in)
{
(void) dev;
while (!SPI_TX_EMPTY) {}
SSP0DR = out;
while (SPI_BUSY) {}
while (!SPI_RX_AVAIL) {}
char tmp = (char)SSP0DR;
if (in != NULL) {
*in = tmp;
}
return 1;
}
void spi_poweron(spi_t dev)
{
(void) dev;
}
void spi_poweroff(spi_t dev)
{
(void) dev;
(void) dev;
}
int spi_conf_pins(spi_t dev)
{
switch (dev) {
case 0:
PINSEL3 |= BIT8 + BIT9; /* SCLK */
PINSEL3 |= BIT14 + BIT15; /* MISO */
PINSEL3 |= BIT16 + BIT17; /* MOSI */
return 0;
default:
return -1;
}
}
#endif /* SPI_0_EN */
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