Posted on May 05, 2006 at 19:25Hi guys! I'm trying to write and after read some data from Serial Flash memory. I use STR710FZ2T6.
My problem is: I can't neither read nor write data in flash.
Well, I will post my source. I'll appreciate any answer or advices.
Sorry for my bad english!
// Stop flash for configuration
// Everytime you wanna to send a command to flash you must call the Spi_Flash_SSN_Low()
Spi_Flash_SSN_High ();
// Initialize Spi-Flash (configure pin and set BSPI1 as master)
Spi_Flash_Init();
// Init and configure BSPI1
Bspi_Disable ( BSPI1 );
BSPI1->CSR1 = ( BSPI_MASTER_SELECT | BSPI_8_BIT_WORD_LENGTH );
BSPI1->CSR2 = BSPI_RESET_FIFO;
Bspi_Clockivider (BSPI1, 8);
//BSPI1->CSR1 |= BSPI_10_WORD_Rx_FIFO_ENABLE;
//BSPI1->CSR2 |= BSPI_10_WORD_Tx_FIFO_ENABLE;
Bspi_Enable ( BSPI1 );
/*****************************************************************************/
// Start communication
// Write enable instruction
Spi_Flash_SSN_Low ();
Spi_Flash_SendInstruction ( M25_WREN );
Spi_Flash_SSN_High ();
// Erase sector before record data in memory
Spi_Flash_SectorErase ( M25_Sector3 );
// Send a Read Status register instruction in order to see if the erase already was done
Spi_Flash_WaitBusy ();
// Write enable instruction
Spi_Flash_SSN_Low ();
Spi_Flash_SendInstruction ( M25_WREN );
Spi_Flash_SSN_High ();
// Start writing
Spi_Flash_SSN_Low ();
Spi_Flash_SendInstruction ( M25_PP );
Spi_Flash_SendAddress ( 0x00000 );
for (int i=0; i
Spi_Flash_SendData(0xAA);
Spi_Flash_SSN_High ();
// Wait instruction to be completed
Spi_Flash_WaitBusy ();
// Write Enable
Spi_Flash_SSN_Low ();
Spi_Flash_SendInstruction ( M25_WREN );
Spi_Flash_SSN_High ();
//Spi_Flash_WriteStatusRegister ( 0x0C );
//Spi_Flash_WaitBusy ();
//bb = Spi_Flash_ReadStatusRegister();
// Read data to see if it was correctly recorded into spi-flash memory
Spi_Flash_SSN_Low ();
Spi_Flash_SendInstruction ( M25_READ );
Spi_Flash_SendAddress ( 0x00030 );
// Receive all the data sent in reverse order
for (int i=9; i>=0; i++)
Buffer[i] = Spi_Flash_ReceiveData();
Spi_Flash_SSN_High ();
while(1); // infinite loop
inline void Spi_Flash_Init ()
{
// Configure GPI00 on mode Alternate function Push Pull
GPIO_Config ( GPIO0, BSPI1_MISO | BSPI1_MOSI | BSPI1_SCLK, GPIO_AF_PP );
// Configure SCLK & SSN clock and data lines control
GPIO_Config ( GPIO0, M25_SSN | BSPI1_MC | BSPI1_SSN, GPIO_OUT_PP );
// Set the BSPI1_MC pin to high level to configure the BSPI1 as master in the STR710 eval board
GPIO0->PD |= 0x0002;
}
// Everytime you wanna to send a command to flash you must call the Spi_Flash_Enable()
// that keep the !SSN M2510 pin low
inline void Spi_Flash_SSN_Low ()
{
GPIO0->PD &= ~0x0008;
}
// And after any access you gotta set high !SSN pin calling Spi_Flash_Disable
inline void Spi_Flash_SSN_High ()
{
GPIO0->PD |= 0x0008;
}
u8 BPSI_DataSendReceive ( u8 data )
{
u8 ret_value;
while( BSPI1->CSR2 & BSPI_Rx_FIFO_NOT_EMPTY )
ret_value = BSPI1->RXR; // Clear Rx FIFO
// Wait until the Transmit FIFO is empty
while( !( BSPI1->CSR2 & BSPI_Tx_FIFO_EMPTY ) );
// Send data to Transmit buffer
BSPI1->TXR = (data<
// Wait until the Transmit FIFO is empty
while( !( BSPI1->CSR2 & BSPI_Tx_FIFO_EMPTY ) );
// Wait until the end of transmission
while( BSPI1->CSR2 & BSPI_Rx_FIFO_NOT_EMPTY )
ret_value = BSPI1->RXR; // Clear Rx
ret_value = (BSPI1->RXR)>>8; // Read the received data
return ret_value;
}
inline void Spi_Flash_SendAddress ( u32 data )
{
Spi_Flash_SendData ( (data & 0x00FF0000)>>16 );
Spi_Flash_SendData ( (data & 0x0000FF00)>>8 );
Spi_Flash_SendData ( (data & 0x000000FF) );
}
inline u8 Spi_Flash_ReadStatusRegister()
{
u8 ret_value;
// Select device
Spi_Flash_SSN_Low();
// Send instruction to Transmit buffer
ret_value = BPSI_DataSendReceive ( M25_RDSR );
// Deselect device
Spi_Flash_SSN_High ();
return ret_value;
}
inline void Spi_Flash_WriteStatusRegister ( u8 value )
{
// Select device
Spi_Flash_SSN_Low();
// Send instruction to Transmit buffer
BPSI_DataSendReceive ( M25_WRSR );
BPSI_DataSendReceive ( value );
// Deselect device
Spi_Flash_SSN_High ();
}
inline void Spi_Flash_SectorErase ( Spi_Flash_Sector_TypeDef Sector )
{
// Select device
Spi_Flash_SSN_Low();
// Send Sector Erase Instruction
BPSI_DataSendReceive ( M25_SE );
// Send sector address
Spi_Flash_SendAddress ( Sector );
// Deselect device
Spi_Flash_SSN_High ();
}
inline void Spi_Flash_WaitBusy()
{
while ( ( Spi_Flash_ReadStatusRegister() & M25_WIP ) );
}
Thanks!! ;)
