rt-thread-official/bsp/stm32f20x/Drivers/FM25Lx.c

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2013-01-08 22:40:58 +08:00
#include "FM25Lx.h"
#include "rtthread.h"
#include "stm32f2xx_rcc.h"
#include <stm32f2xx.h>
#define FLASH_TRACE(...)
//#define FLASH_TRACE rt_kprintf
#define CS_LOW() GPIO_ResetBits(FM25_SPI_NSS_GPIO, FM25_SPI_NSS_PIN)
#define CS_HIGH() GPIO_SetBits(FM25_SPI_NSS_GPIO, FM25_SPI_NSS_PIN)
#define spi_config() rt_hw_spi2_baud_rate(SPI_BaudRatePrescaler_4);/* 72M/4=18M */
#define fram_lock() rt_sem_take(fram_lock, RT_WAITING_FOREVER);
#define fram_unlock() rt_sem_release(fram_lock);
static uint32_t spi_timeout_cnt = 0;
rt_sem_t fram_lock;
void rt_hw_spi2_baud_rate(uint16_t SPI_BaudRatePrescaler)
{
SPI2->CR1 &= ~SPI_BaudRatePrescaler_256;
SPI2->CR1 |= SPI_BaudRatePrescaler;
}
/* FM25L256 using SPI2 */
void fm25_spi_cfg()
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* Enable SPI Periph clock */
RCC_AHB1PeriphClockCmd(FM25_SPI_NSS_GPIO_CLK | FM25_SPI_GPIO_CLK, ENABLE);
RCC_APB1PeriphClockCmd(FM25_SPI_CLK, ENABLE); //enable SPI clock
//Setup GPIO
GPIO_InitStructure.GPIO_Pin = FM25_SPI_SCK | FM25_SPI_MISO | FM25_SPI_MOSI;
/*Connect Pin to AF*/
GPIO_PinAFConfig(FM25_SPI_GPIO, GPIO_PinSource3, GPIO_AF_SPI3);
GPIO_PinAFConfig(FM25_SPI_GPIO, GPIO_PinSource4, GPIO_AF_SPI3);
GPIO_PinAFConfig(FM25_SPI_GPIO, GPIO_PinSource5, GPIO_AF_SPI3);
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(FM25_SPI_GPIO, &GPIO_InitStructure);
/* CS pin: PB12 */
GPIO_InitStructure.GPIO_Pin = FM25_SPI_NSS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_Init(FM25_SPI_NSS_GPIO, &GPIO_InitStructure);
CS_HIGH();
SPI_Cmd(FM25_SPI, DISABLE);
/*------------------------ SPI configuration ------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;/* 72M/64=1.125M */
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
//SPI_I2S_DeInit(FM25_SPI);
SPI_Init(FM25_SPI, &SPI_InitStructure);
/* Enable SPI_MASTER */
SPI_Cmd(FM25_SPI, ENABLE);
//SPI_CalculateCRC(FM25_SPI, DISABLE);
fram_lock = rt_sem_create("framlock", 1, RT_IPC_FLAG_FIFO);
}
static uint8_t spi_readwrite(uint8_t data)
{
int32_t timeout = 0xFFFFF;
//rt_kprintf("State 0x%X\n", SPI_I2S_GetFlagStatus(FM25_SPI, SPI_I2S_FLAG_TXE));
//Wait until the transmit buffer is empty
while (SPI_I2S_GetFlagStatus(FM25_SPI, SPI_I2S_FLAG_TXE) == RESET && --timeout >0);
if( timeout <= 0 ){ spi_timeout_cnt++; return 0;}
// Send the byte
SPI_I2S_SendData(FM25_SPI, data);
timeout = 0xFFFFF;
//Wait until a data is received
while (SPI_I2S_GetFlagStatus(FM25_SPI, SPI_I2S_FLAG_RXNE) == RESET && --timeout >0);
if( timeout <= 0 ){ spi_timeout_cnt++; return 0;}
// Get the received data
data = SPI_I2S_ReceiveData(FM25_SPI);
// Return the shifted data
return data;
}
static uint8_t fm25_read_status(void)
{
uint8_t tmp;
CS_LOW();
spi_readwrite( FM25_RDSR );
tmp=spi_readwrite(0xFF);
CS_HIGH();
return tmp;
}
rt_size_t fm25_read(rt_device_t dev, rt_off_t offset, void * buf, rt_size_t size)
{
uint32_t index;
uint8_t *buffer = (uint8_t*) buf;
fram_lock();
//spi_config();
//rt_kprintf("READ: %d, size=%d\n", offset, size);
CS_LOW();
spi_readwrite( FM25_READ);
spi_readwrite( (offset >> 8)&0xFF );
spi_readwrite( offset & 0xFF );
for(index=0; index<size; index++)
{
*buffer++ = spi_readwrite(0xFF);
if( spi_timeout_cnt > 0 )
{
fram_unlock();
spi_timeout_cnt = 0;
rt_kprintf("Read time out\n");
return -1;
}
offset++;
}
CS_HIGH();
fram_unlock();
return size;
}
rt_size_t fm25_write(rt_device_t dev, rt_off_t offset, const void * buf, rt_size_t size)
{
uint32_t index = size;
uint8_t *buffer = (uint8_t*) buf;
fram_lock();
//spi_config();
//rt_kprintf("WRITE: %d, size=%d\n", offset, size);
CS_LOW();
spi_readwrite( FM25_WREN );
CS_HIGH();
CS_LOW();
spi_readwrite( FM25_WRITE);
spi_readwrite( (offset >> 8)&0xFF );
spi_readwrite( offset & 0xFF );
while( index > 0 )
{
spi_readwrite( *buffer++ );
if( spi_timeout_cnt > 0 )
{
fram_unlock();
rt_kprintf("Write time out\n");
spi_timeout_cnt = 0;
return -1;
}
index--;
offset++;
}
CS_HIGH();
//rt_thread_delay(100);
fram_unlock();
return size;
}
static rt_err_t fm25_init(rt_device_t dev)
{
return RT_EOK;
}
static rt_err_t fm25_open(rt_device_t dev, rt_uint16_t oflag)
{
char i;
SPI_Cmd(FM25_SPI, ENABLE);
if( oflag != RT_DEVICE_FLAG_RDONLY )
{
CS_LOW();
spi_readwrite( FM25_WRSR );
spi_readwrite( FM25_WPEN );
CS_HIGH();
//rt_kprintf("RDSR=0x%X\n", fm25_read_status());
}
return RT_EOK;
}
static rt_err_t fm25_close(rt_device_t dev)
{
CS_LOW();
spi_readwrite( FM25_WRDI );
CS_HIGH();
SPI_Cmd(FM25_SPI, DISABLE);
return RT_EOK;
}
static rt_err_t fm25_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
RT_ASSERT(dev != RT_NULL);
if (cmd == RT_DEVICE_CTRL_BLK_GETGEOME)
{
struct rt_device_blk_geometry *geometry;
geometry = (struct rt_device_blk_geometry *)args;
if (geometry == RT_NULL) return -RT_ERROR;
geometry->bytes_per_sector = 1;
geometry->block_size = 1;
geometry->sector_count = 8192;
}
return RT_EOK;
}
static struct rt_device spi_flash_device;
void fm25_hw_init()
{
int i = 0xFFFFF;
fm25_spi_cfg();
while(i--);
//spi_config();
CS_LOW();
spi_readwrite( FM25_WRDI );
CS_HIGH();
spi_flash_device.type = RT_Device_Class_Block;
spi_flash_device.init = fm25_init;
spi_flash_device.open = fm25_open;
spi_flash_device.close = fm25_close;
spi_flash_device.read = fm25_read;
spi_flash_device.write = fm25_write;
spi_flash_device.control = fm25_control;
/* no private */
spi_flash_device.user_data = RT_NULL;
rt_device_register(&spi_flash_device, "fram0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_STANDALONE);
}
int fram_test(int x)
{
//rt_kprintf("SR=0x%X\nCR1=0x%X\nCR2=0x%X\n", FM25_SPI->SR, FM25_SPI->CR1,FM25_SPI->CR2);
rt_device_t device = RT_NULL;
char buf[256];
char read[256];
int i, j;
for(i =0; i< 256; i++ )
{
buf[i] = i;
read[i] = 0;
}
// step 1:find device
device = rt_device_find("fram0");
if( device == RT_NULL)
{
rt_kprintf("device %s: not found!\r\n");
return RT_ERROR;
}
device->open(device,RT_DEVICE_FLAG_RDWR);
for( j = 0; j < FM25_MAXSIZE; j+= 256 )
//j = 256*x;
{
//rt_kprintf("RDSR=0x%X\n", fm25_read_status());
device->write(device,j, buf,256);
device->read(device,j, read,256);
for(i =0; i< 256; i++ )
{
if( buf[i] != read[i] )
rt_kprintf("error at %d: %d!=%d\n", i, buf[i], read[i]);
}
}
device->close(device);
rt_kprintf("Finsh test\n");
}
#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT(fram_test, test system);
#endif