270 lines
9.6 KiB
C
270 lines
9.6 KiB
C
/**************************************************************************//**
|
|
* @file
|
|
* @brief SPI implementation of Board Control interface
|
|
* This implementation use the USART2 SPI interface to control board
|
|
* control registers. It works
|
|
* @author Energy Micro AS
|
|
* @version 2.0.1
|
|
******************************************************************************
|
|
* @section License
|
|
* <b>(C) Copyright 2012 Energy Micro AS, http://www.energymicro.com</b>
|
|
*******************************************************************************
|
|
*
|
|
* Permission is granted to anyone to use this software for any purpose,
|
|
* including commercial applications, and to alter it and redistribute it
|
|
* freely, subject to the following restrictions:
|
|
*
|
|
* 1. The origin of this software must not be misrepresented; you must not
|
|
* claim that you wrote the original software.
|
|
* 2. Altered source versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software.
|
|
* 3. This notice may not be removed or altered from any source distribution.
|
|
* 4. The source and compiled code may only be used on Energy Micro "EFM32"
|
|
* microcontrollers and "EFR4" radios.
|
|
*
|
|
* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
|
|
* obligation to support this Software. Energy Micro AS is providing the
|
|
* Software "AS IS", with no express or implied warranties of any kind,
|
|
* including, but not limited to, any implied warranties of merchantability
|
|
* or fitness for any particular purpose or warranties against infringement
|
|
* of any proprietary rights of a third party.
|
|
*
|
|
* Energy Micro AS will not be liable for any consequential, incidental, or
|
|
* special damages, or any other relief, or for any claim by any third party,
|
|
* arising from your use of this Software.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
/***************************************************************************//**
|
|
* @addtogroup BSP
|
|
* @{
|
|
******************************************************************************/
|
|
|
|
#include <stdio.h>
|
|
#include "efm32.h"
|
|
#include "em_usart.h"
|
|
#include "em_gpio.h"
|
|
#include "em_cmu.h"
|
|
#include "dvk.h"
|
|
#include "dvk_bcregisters.h"
|
|
|
|
#ifdef _EFM32_TINY_FAMILY
|
|
|
|
/* USART used for SPI access */
|
|
#define USART_USED USART0
|
|
#define USART_CLK cmuClock_USART0
|
|
|
|
/* GPIO pins used, please refer to DVK user guide. */
|
|
#define PIN_SPIBUS_CONNECT 13
|
|
#define PORT_SPIBUS_CONNECT gpioPortC
|
|
#define PIN_SPI_TX 10
|
|
#define PORT_SPI_TX gpioPortE
|
|
#define PIN_SPI_RX 11
|
|
#define PORT_SPI_RX gpioPortE
|
|
#define PIN_SPI_CLK 12
|
|
#define PORT_SPI_CLK gpioPortE
|
|
#define PIN_SPI_CS 13
|
|
#define PORT_SPI_CS gpioPortE
|
|
|
|
#else
|
|
|
|
/* USART used for SPI access */
|
|
#define USART_USED USART2
|
|
#define USART_CLK cmuClock_USART2
|
|
|
|
/* GPIO pins used, please refer to DVK user guide. */
|
|
#define PIN_SPIBUS_CONNECT 13
|
|
#define PORT_SPIBUS_CONNECT gpioPortC
|
|
#define PIN_EBIBUS_CONNECT 12
|
|
#define PORT_EBIBUS_CONNECT gpioPortC
|
|
#define PIN_SPI_TX 2
|
|
#define PORT_SPI_TX gpioPortC
|
|
#define PIN_SPI_RX 3
|
|
#define PORT_SPI_RX gpioPortC
|
|
#define PIN_SPI_CLK 4
|
|
#define PORT_SPI_CLK gpioPortC
|
|
#define PIN_SPI_CS 5
|
|
#define PORT_SPI_CS gpioPortC
|
|
|
|
#endif
|
|
|
|
static volatile uint16_t *lastAddr = NULL;
|
|
|
|
/**************************************************************************//**
|
|
* @brief Initializes SPI interface for access to FPGA registers
|
|
* for board control
|
|
*****************************************************************************/
|
|
static void spiInit(void)
|
|
{
|
|
USART_InitSync_TypeDef init = USART_INITSYNC_DEFAULT;
|
|
|
|
/* Enable module clocks */
|
|
CMU_ClockEnable(cmuClock_GPIO, true);
|
|
CMU_ClockEnable(cmuClock_HFPER, true);
|
|
CMU_ClockEnable(USART_CLK, true);
|
|
|
|
/* Configure SPI bus connect pins, DOUT set to 0, disable EBI */
|
|
GPIO_PinModeSet(PORT_SPIBUS_CONNECT, PIN_SPIBUS_CONNECT, gpioModePushPull, 0);
|
|
GPIO_PinModeSet(PORT_EBIBUS_CONNECT, PIN_EBIBUS_CONNECT, gpioModePushPull, 1);
|
|
|
|
/* Configure SPI pins */
|
|
GPIO_PinModeSet(PORT_SPI_TX, PIN_SPI_TX, gpioModePushPull, 0);
|
|
GPIO_PinModeSet(PORT_SPI_RX, PIN_SPI_RX, gpioModePushPull, 0);
|
|
GPIO_PinModeSet(PORT_SPI_CLK, PIN_SPI_CLK, gpioModePushPull, 0);
|
|
/* Keep CS high to not activate slave */
|
|
GPIO_PinModeSet(PORT_SPI_CS, PIN_SPI_CS, gpioModePushPull, 1);
|
|
|
|
/* Configure to use SPI master with manual CS */
|
|
/* For now, configure SPI for worst case 32MHz clock in order to work for all */
|
|
/* configurations. */
|
|
init.refFreq = 32000000;
|
|
init.baudrate = 7000000;
|
|
USART_InitSync(USART_USED, &init);
|
|
|
|
/* Enable pins at default location */
|
|
USART_USED->ROUTE = USART_ROUTE_TXPEN | USART_ROUTE_RXPEN | USART_ROUTE_CLKPEN;
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Disables GPIO pins and USART from FPGA register access
|
|
*****************************************************************************/
|
|
static void spiDisable(void)
|
|
{
|
|
USART_Reset(USART_USED);
|
|
|
|
/* Disable LCD_SELECT */
|
|
GPIO_PinModeSet(gpioPortD, 13, gpioModeDisabled, 0);
|
|
|
|
/* Disable SPI pins */
|
|
GPIO_PinModeSet(PORT_SPIBUS_CONNECT, 13, gpioModeDisabled, 0);
|
|
GPIO_PinModeSet(PORT_SPIBUS_CONNECT, 12, gpioModeDisabled, 0);
|
|
GPIO_PinModeSet(PORT_SPI_TX, PIN_SPI_TX, gpioModeDisabled, 0);
|
|
GPIO_PinModeSet(PORT_SPI_RX, PIN_SPI_RX, gpioModeDisabled, 0);
|
|
GPIO_PinModeSet(PORT_SPI_CLK, PIN_SPI_CLK, gpioModeDisabled, 0);
|
|
GPIO_PinModeSet(PORT_SPI_CS, PIN_SPI_CS, gpioModeDisabled, 0);
|
|
|
|
/* Disable USART clock - we can't disable GPIO or HFPER as we don't know who else
|
|
* might be using it */
|
|
CMU_ClockEnable(USART_CLK, false);
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Perform SPI Transfer
|
|
*****************************************************************************/
|
|
static uint16_t spiAccess(uint8_t spiaddr, uint8_t rw, uint16_t spidata)
|
|
{
|
|
uint16_t tmp;
|
|
|
|
GPIO_PinOutClear(PORT_SPI_CS, PIN_SPI_CS);
|
|
|
|
/* For every byte sent, one is received */
|
|
|
|
/* Write SPI address */
|
|
USART_Tx(USART_USED, (spiaddr & 0x3) | rw << 3);
|
|
/* Just ignore data read back */
|
|
USART_Rx(USART_USED);
|
|
|
|
/* SPI data LSB */
|
|
USART_Tx(USART_USED, spidata & 0xFF);
|
|
tmp = (uint16_t)USART_Rx(USART_USED);
|
|
|
|
/* SPI data MSB */
|
|
USART_Tx(USART_USED, spidata >> 8);
|
|
tmp |= (uint16_t)USART_Rx(USART_USED) << 8;
|
|
|
|
GPIO_PinOutSet(PORT_SPI_CS, PIN_SPI_CS);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Performs SPI write to FPGA register
|
|
* @param spiadr Address of register
|
|
* @param spidata Data to write
|
|
*****************************************************************************/
|
|
static void spiWrite(uint8_t spiadr, uint16_t spidata)
|
|
{
|
|
spiAccess(spiadr, 0, spidata);
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Performs SPI read from FPGA register
|
|
* @param spiadr Address of register
|
|
* @param spidata Dummy data
|
|
*****************************************************************************/
|
|
static uint16_t spiRead(uint8_t spiadr, uint16_t spidata)
|
|
{
|
|
return spiAccess(spiadr, 1, spidata);
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Initializes DVK register access
|
|
* @return true on success, false on failure
|
|
*****************************************************************************/
|
|
bool DVK_SPI_init(void)
|
|
{
|
|
uint16_t spiMagic;
|
|
|
|
spiInit();
|
|
/* Read "board control Magic" register to verify SPI is up and running */
|
|
/* if not FPGA is configured to be in EBI mode */
|
|
|
|
spiMagic = DVK_SPI_readRegister(BC_MAGIC);
|
|
if(spiMagic != BC_MAGIC_VALUE)
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return true;
|
|
}
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Disable and free up resources used by SPI board control access
|
|
*****************************************************************************/
|
|
void DVK_SPI_disable(void)
|
|
{
|
|
spiDisable();
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Perform read from DVK board control register
|
|
* @param addr Address of register to read from
|
|
*****************************************************************************/
|
|
uint16_t DVK_SPI_readRegister(volatile uint16_t *addr)
|
|
{
|
|
uint16_t data;
|
|
|
|
if (addr != lastAddr)
|
|
{
|
|
spiWrite(0x00, 0xFFFF & ((uint32_t) addr)); /*LSBs of address*/
|
|
spiWrite(0x01, 0xFF & ((uint32_t) addr >> 16)); /*MSBs of address*/
|
|
spiWrite(0x02, (0x0C000000 & (uint32_t) addr) >> 26); /*Chip select*/
|
|
}
|
|
/* Read twice */
|
|
data = spiRead(0x03, 0);
|
|
data = spiRead(0x03, 0);
|
|
lastAddr = addr;
|
|
return data;
|
|
}
|
|
|
|
/**************************************************************************//**
|
|
* @brief Perform write to DVK board control register
|
|
* @param addr Address of register to write to
|
|
* @param data 16-bit to write into register
|
|
*****************************************************************************/
|
|
void DVK_SPI_writeRegister(volatile uint16_t *addr, uint16_t data)
|
|
{
|
|
if (addr != lastAddr)
|
|
{
|
|
spiWrite(0x00, 0xFFFF & ((uint32_t) addr)); /*LSBs of address*/
|
|
spiWrite(0x01, 0xFF & ((uint32_t) addr >> 16)); /*MSBs of address*/
|
|
spiWrite(0x02, (0x0C000000 & (uint32_t) addr) >> 26); /*Chip select*/
|
|
}
|
|
spiWrite(0x03, data); /*Data*/
|
|
lastAddr = addr;
|
|
}
|
|
|
|
/** @} (end group BSP) */
|