/*******************************************************************************
* It returns 8 bits vendor ID
*******************************************************************************/
uint8_t EEPROM_readVendorId(){
unsigned short r_data = 0;
unsigned char r_pcs;
spi_write(SPI, RDID, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
/**************** SENDING DUMMY ADDRESS ************************/
spi_write(SPI, 0x00, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, 0x00, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, 0x00, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
/**************** RECEIVING DATA ************************/
spi_write(SPI, 0x05, spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
return r_data;
}
/**
@ingroup spi_function
@brief Send an array of bytes to to the SPI bus.
@note Can only be used if SPI_USE_BUFFER are enabled in spi_iha_defs.h
@see spi_iha_defs.h for SPI_USE_BUFFER setup.
@return SPI_OK: OK byte send to SPI bus or put in tx_buffer.\n
SPI_NO_ROOM_IN_TX_BUFFER: Buffer full no data send\n
SPI_ILLEGAL_INSTANCE: instance is null.
@param spi to send to.
@param *buf pointer to buffer to be send.
@param len no of bytes to send.
*/
uint8_t spi_send_bytes(spi_p spi, uint8_t buf[], uint8_t len) {
uint8_t result = SPI_OK;
uint32_t value;
uint8_t tmp = 0;
if (spi == NULL) {
return SPI_ILLEGAL_INSTANCE;
}
// Select correct instance
if (_this != spi ) {
_select_instance(spi);
}
// Critical section
{
// disable interrupt
spi_disable_interrupt(_spi_base, SPI_IDR_TDRE | SPI_IDR_RDRF);
// Check if buffer is free
if (len > fifo_get_free_size(spi->_spi_tx_fifo_desc)) {
result = SPI_NO_ROOM_IN_TX_BUFFER;
} else {
// If SPI in idle send the first byte
if (!_spi_active) {
_spi_active = 1;
// Send first byte
value = SPI_TDR_TD(buf[0]) | SPI_TDR_PCS(spi_get_pcs(spi->_cs_pin));
if (len == 1) {
// It was last byte
value |= SPI_TDR_LASTXFER;
}
// Send byte
_spi_base->SPI_TDR = value;
//spi_enable_interrupt(_spi_base, SPI_IER_TDRE);
tmp = 1;
}
// Put in the tx buffer
for (uint8_t i = tmp; i < len; i++) {
value = SPI_TDR_TD(buf[i]) | SPI_TDR_PCS(spi_get_pcs(spi->_cs_pin));
if (i == len-1) {
// It was last byte
value |= SPI_TDR_LASTXFER;
}
if ( fifo_push_uint32(spi->_spi_tx_fifo_desc, value) == FIFO_ERROR_OVERFLOW ) {
result = SPI_NO_ROOM_IN_TX_BUFFER;
}
}
}
// restore interrupt state
spi_enable_interrupt(_spi_base, SPI_IER_TDRE | SPI_IER_RDRF);
}
return result;
}
/*******************************************************************************
* WRITE EEPROM STATUS BYTE
* | W/R|| _ | _ | _ | W/R | W/R | R | R |
* | WPEN| X | X | X | BP1 | BP0 | WEL | WIP |
*******************************************************************************/
void _EEPROM_writeStatusReg(uint8_t w_status){
unsigned char r_pcs;
uint8_t r_data = 0;
spi_write(SPI, WRSR, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, w_status, spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
}
/*******************************************************************************
* READ EEPROM STATUS BYTE
* | W/R|| _ | _ | _ | W/R | W/R | R | R |
* | WPEN| X | X | X | BP1 | BP0 | WEL | WIP |
*******************************************************************************/
uint8_t _EEPROM_readStatusReg(){
unsigned char r_pcs;
uint8_t r_data = 0;
spi_write(SPI, RDSR, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, 0x00, spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
return r_data;
}
/*******************************************************************************
* DEEP POWER DOWN MODE
*******************************************************************************/
void EEPROM_powerDownMode(){
unsigned short r_data = 0;
unsigned char r_pcs;
spi_write(SPI, DPD, spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
}
/*******************************************************************************
* DISABLE WRITE EEPROM LATCH
*******************************************************************************/
void _EEPROM_wrdi(){
unsigned short r_data = 0;
unsigned char r_pcs;
spi_write(SPI, WRDI, spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
}
/*******************************************************************************
* The Chip Erase function will erase all bits (0xFF) in the array.
*
* While the device is executing the chipErase() function, the WriteInProcess()
* macro can be read to determine when the Chip Erase function is complete.
*
*******************************************************************************/
void EEPROM_chipErase(){
unsigned short r_data = 0;
unsigned char r_pcs;
_EEPROM_wren();
spi_write(SPI, CE, spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
}
/**
* \brief Initialize SPI as master.
*/
static void spi_master_initialize(void)
{
/* Configure an SPI peripheral. */
uint32_t spi_chip_sel, spi_clk_freq, spi_clk_pol, spi_clk_pha;
spi_enable_clock(SPI_MASTER_BASE);
spi_reset(SPI_MASTER_BASE);
spi_set_master_mode(SPI_MASTER_BASE);
spi_disable_mode_fault_detect(SPI_MASTER_BASE);
spi_disable_loopback(SPI_MASTER_BASE);
spi_set_peripheral_chip_select_value(SPI_MASTER_BASE, spi_get_pcs(2)); // This sets the value of PCS within the Mode Register.
spi_set_variable_peripheral_select(SPI_MASTER_BASE); // PCS needs to be set within each transfer (PCS within SPI_TDR).
spi_disable_peripheral_select_decode(SPI_MASTER_BASE); // Each CS is to be connected to a single device.
spi_set_delay_between_chip_select(SPI_MASTER_BASE, SPI_DLYBCS);
/* Set communication parameters for CS0 */
spi_chip_sel = 0;
spi_clk_freq = 100000; // SPI CLK for RTC = 100kHz.
spi_clk_pol = 1;
spi_clk_pha = 0;
spi_set_transfer_delay(SPI_MASTER_BASE, spi_chip_sel, SPI_DLYBS,
SPI_DLYBCT);
spi_set_bits_per_transfer(SPI_MASTER_BASE, spi_chip_sel, SPI_CSR_BITS_16_BIT);
spi_set_baudrate_div(SPI_MASTER_BASE, spi_chip_sel, spi_calc_baudrate_div(spi_clk_freq, sysclk_get_cpu_hz()));
spi_configure_cs_behavior(SPI_MASTER_BASE, spi_chip_sel, SPI_CS_RISE_FORCED); // CS rises after SPI transfers have completed.
spi_set_clock_polarity(SPI_MASTER_BASE, spi_chip_sel, spi_clk_pol);
spi_set_clock_phase(SPI_MASTER_BASE, spi_chip_sel, spi_clk_pha);
/* Set communication parameters for CS1 */
spi_chip_sel = 1;
spi_clk_freq = 2000000; // SPI CLK for RTC = 4MHz.
spi_clk_pol = 0;
spi_clk_pha = 0;
spi_set_transfer_delay(SPI_MASTER_BASE, spi_chip_sel, SPI_DLYBS,
SPI_DLYBCT);
spi_set_bits_per_transfer(SPI_MASTER_BASE, spi_chip_sel, SPI_CSR_BITS_8_BIT);
spi_set_baudrate_div(SPI_MASTER_BASE, spi_chip_sel, spi_calc_baudrate_div(spi_clk_freq, sysclk_get_cpu_hz()));
spi_configure_cs_behavior(SPI_MASTER_BASE, spi_chip_sel, SPI_CS_RISE_FORCED);
spi_set_clock_polarity(SPI_MASTER_BASE, spi_chip_sel, spi_clk_pol);
spi_set_clock_phase(SPI_MASTER_BASE, spi_chip_sel, spi_clk_pha);
/* Set communication parameters for CS2 */
spi_chip_sel = 2;
spi_clk_freq = 44000000; // SPI CLK for MEM2 = 44MHz.
spi_clk_pol = 1;
spi_clk_pha = 0;
spi_set_transfer_delay(SPI_MASTER_BASE, spi_chip_sel, SPI_DLYBS,
SPI_DLYBCT);
spi_set_bits_per_transfer(SPI_MASTER_BASE, spi_chip_sel, SPI_CSR_BITS_8_BIT);
spi_set_baudrate_div(SPI_MASTER_BASE, spi_chip_sel, spi_calc_baudrate_div(spi_clk_freq, sysclk_get_cpu_hz()));
spi_configure_cs_behavior(SPI_MASTER_BASE, spi_chip_sel, SPI_CS_KEEP_LOW);
spi_set_clock_polarity(SPI_MASTER_BASE, spi_chip_sel, spi_clk_pol);
spi_set_clock_phase(SPI_MASTER_BASE, spi_chip_sel, spi_clk_pha);
/* Enable SPI Communication */
spi_enable(SPI_MASTER_BASE);
}
/*******************************************************************************
* READ DATA FROM EEPROM
* ***** ARGUMENTS *****
* /param reasAdd: EEEPROM address from where it is wanted to start reading
* /param data: Pointer of a byte vector variable in which data read is going to be stored
* /param dataSize: Size of the vector variable pointed by "data" pointer
*
* ***** FUNCTIONALITY *****
* readData() reads a frame of 0-137071 data, the start address is specified in "readAdd" argument,
* then the function will query as many data as specified by sizeData from EEPROM and will store it
* in variable pointed by "data" pointer argument.
*
* IMPORTANT: there's not knowledge about the limit of data it's allowed to be read in a frame
*******************************************************************************/
void EEPROM_readData(uint8_t *readAdd, uint8_t *data, uint32_t dataSize){
unsigned short r_data = 0;
unsigned char r_pcs;
spi_write(SPI, READ, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
/**************** SENDING ADDRESS ************************/
spi_write(SPI, readAdd[2], spi_get_pcs(3), 0); // Address MSB
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, readAdd[1], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, readAdd[0], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
/**************** RECEIVING DATA ************************/
for(int i = 0; i<dataSize-1; i++){
spi_write(SPI, 0xAA, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) data, (uint8_t*) &r_pcs); // It receive data in "data" and it's a pointer
data++;
}
spi_write(SPI, 0x55, spi_get_pcs(3), 1); // The las byte must toggle CS
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) data, (uint8_t*) &r_pcs);
}
/*******************************************************************************
* ERRASE A WHOLE SECTOR OF DATA FROM EPPROM
* \param pageAdd: you can write any of the 65535 address into this function and it will erase the whole sector
*******************************************************************************/
void EEPROM_sectorErase(uint8_t *sectorAdd){
unsigned short r_data = 0;
unsigned char r_pcs;
//Command
spi_write(SPI, SE, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
//address
spi_write(SPI, sectorAdd[2], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, sectorAdd[1], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, sectorAdd[0], spi_get_pcs(3), 1);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
}
spi_p spi_new_instance(Spi * spi_base, uint8_t spi_chip_sel, uint32_t spi_freq, uint8_t spi_mode, uint8_t buffer_size, void(*handler_call_back )(spi_p, uint8_t))
{
_spi_base = spi_base;
if (!spi_is_enabled(_spi_base)) {
_spi_init_base(spi_base);
}
spi_p _spi = malloc(sizeof *_spi);
_spi->_call_back = handler_call_back;
_spi->_cs_pin = spi_chip_sel;
_spi->_spi_rx_fifo_desc = (fifo_desc_t *)malloc(sizeof(fifo_desc_t));
_spi->_spi_tx_fifo_desc = (fifo_desc_t *)malloc(sizeof(fifo_desc_t));
union spi_buffer_element *spi_tx_fifo_buffer = (union spi_buffer_element *)(malloc(sizeof(union spi_buffer_element) * buffer_size));
union spi_buffer_element *spi_rx_fifo_buffer = (union spi_buffer_element *)(malloc(sizeof(union spi_buffer_element) * buffer_size));
fifo_init(_spi->_spi_rx_fifo_desc, spi_rx_fifo_buffer, buffer_size);
fifo_init(_spi->_spi_tx_fifo_desc, spi_tx_fifo_buffer, buffer_size);
spi_set_peripheral_chip_select_value(spi_base, spi_get_pcs(spi_chip_sel));
switch (spi_mode)
{
case 0:
spi_set_clock_polarity(spi_base, spi_chip_sel,0);
spi_set_clock_phase(spi_base, spi_chip_sel, 1);
break;
case 1:
spi_set_clock_polarity(spi_base, spi_chip_sel, 0);
spi_set_clock_phase(spi_base, spi_chip_sel, 0);
break;
case 2:
spi_set_clock_polarity(spi_base, spi_chip_sel, 1);
spi_set_clock_phase(spi_base, spi_chip_sel, 1);
break;
case 3:
spi_set_clock_polarity(spi_base, spi_chip_sel, 1);
spi_set_clock_phase(spi_base, spi_chip_sel, 0);
break;
}
spi_set_bits_per_transfer(spi_base, spi_chip_sel, SPI_CSR_BITS_8_BIT);
spi_configure_cs_behavior(spi_base, spi_chip_sel, SPI_CS_KEEP_LOW);
spi_set_baudrate_div(spi_base, spi_chip_sel, (sysclk_get_peripheral_hz() / spi_freq));
spi_set_delay_between_chip_select(spi_base, 0x10);
spi_set_transfer_delay(spi_base, spi_chip_sel, 0x01, 0x10);
spi_enable(spi_base);
return _spi;
}
void spi_master_read(void *p_buf, uint32_t size, uint32_t chip_sel)
{
uint32_t i;
uint8_t pcs;
pcs = spi_get_pcs(chip_sel);
uint16_t data;
uint16_t *p_buffer;
p_buffer = p_buf;
for (i = 0; i < size; i++)
{
spi_write(SPI_MASTER_BASE, 0, pcs, 0);
/* Wait transfer done. */
while ((spi_read_status(SPI_MASTER_BASE) & SPI_SR_RDRF) == 0);
spi_read(SPI_MASTER_BASE, &data, &pcs);
p_buffer[i] = (uint8_t)data;
}
}
/**
* \brief Perform SPI master transfer.
*
* \param pbuf Pointer to buffer to transfer.
* \param size Size of the buffer.
*/
void spi_master_transfer(void *p_buf, uint32_t size, uint8_t chip_sel)
{
uint32_t i = 0;
uint8_t pcs;
pcs = spi_get_pcs(chip_sel);
uint16_t data;
uint8_t timeout = 84; // ~1us timeout for getting the read status back.
uint16_t *p_buffer;
p_buffer = p_buf;
if(size == 1) // Only transfer a single message.
{
spi_write(SPI_MASTER_BASE, p_buffer[i], pcs, 1);
// The last parameter above tells SPI whether this is the last byte to be transferred.
/* Wait transfer done. */
while ((spi_read_status(SPI_MASTER_BASE) & SPI_SR_RDRF) == 0);
spi_read(SPI_MASTER_BASE, &data, &pcs);
p_buffer[i] = data;
return;
}
// Keep CS low for the duration of the transfer, set high @ end.
for (i = 0; i < (size - 1); i++)
{
spi_write(SPI_MASTER_BASE, p_buffer[i], pcs, 0);
/* Wait transfer done. */
while ((spi_read_status(SPI_MASTER_BASE) & SPI_SR_RDRF) == 0);
spi_read(SPI_MASTER_BASE, &data, &pcs);
p_buffer[i] = data;
delay_us(100);
}
delay_us(100);
spi_write(SPI_MASTER_BASE, p_buffer[(size - 1)], pcs, 1);
/* Wait transfer done. */
while ((spi_read_status(SPI_MASTER_BASE) & SPI_SR_RDRF) == 0);
spi_read(SPI_MASTER_BASE, &data, &pcs);
p_buffer[(size - 1)] = data;
return;
}
uint8_t spi_send_byte(spi_p spi, uint8_t byte, uint8_t last_byte)
{
uint8_t result = SPI_OK;
uint32_t value;
if (spi == NULL) {
return SPI_ILLEGAL_INSTANCE;
}
// Select correct instance
if (_this != spi ) {
_select_instance(spi);
}
// Critical section
{
// disable interrupt
spi_disable_interrupt(_spi_base, SPI_IDR_TDRE | SPI_IDR_RDRF);
value = SPI_TDR_TD(byte) | SPI_TDR_PCS(spi_get_pcs(spi->_cs_pin));
if (last_byte) {
value |= SPI_TDR_LASTXFER;
}
// If SPI in idle send the byte
if (!_spi_active) {
_spi_active = 1;
// Send byte
_spi_base->SPI_TDR = value;
} else {
// Put in the TX buffer
if ( fifo_push_uint32(spi->_spi_tx_fifo_desc, value) == FIFO_ERROR_UNDERFLOW )
result = SPI_NO_ROOM_IN_TX_BUFFER;
}
// Enable interrupt
spi_enable_interrupt(_spi_base, SPI_IER_TDRE | SPI_IER_RDRF);
}
return result;
}
void spi_master_transfer_keepcslow(void *p_buf, uint32_t size, uint8_t chip_sel)
{
uint32_t i = 0;
uint8_t pcs;
pcs = spi_get_pcs(chip_sel);
uint16_t data;
uint16_t *p_buffer;
p_buffer = p_buf;
// Keep CS low for the duration of the transfer, keep low @ end.
for (i = 0; i < size; i++)
{
spi_write(SPI_MASTER_BASE, p_buffer[i], pcs, 0);
/* Wait transfer done. */
while ((spi_read_status(SPI_MASTER_BASE) & SPI_SR_RDRF) == 0);
spi_read(SPI_MASTER_BASE, &data, &pcs);
p_buffer[i] = data;
}
return;
}
/*******************************************************************************
* WRITE DATA FROM EEPROM
* ***** ARGUMENTS *****
* /param reasAdd: EEEPROM address where it is wanted to start writing
* /param data: Pointer of a byte vector variable in where data to be sent is
* /param dataSize: Size of the vector variable pointed by "data" pointer
*
* ***** FUNCTIONALITY *****
* writeData() writes a frame of 0-137071 data, the start address is specified in "readAdd" argument,
* then the function will store as many data as specified by sizeData in EEPROM and will store it
* in the variable pointed by "data" pointer argument.
*
* IMPORTANT: there's not knowledge about the limit of data it's allowed to be read in a frame
*******************************************************************************/
void EEPROM_writeData(uint8_t *writeAdd, uint8_t *data, uint8_t dataSize){
unsigned short r_data = 0;
unsigned char r_pcs;
_EEPROM_wren();
spi_write(SPI, WRITE, spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
/**************** SENDING ADDRESS ************************/
spi_write(SPI, writeAdd[2], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, writeAdd[1], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
spi_write(SPI, writeAdd[0], spi_get_pcs(3), 0);
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) &r_data, (uint8_t*) &r_pcs);
/**************** SENDING DATA ************************/
for(int i = 0; i<dataSize-1; i++){
spi_write(SPI, *data, spi_get_pcs(3), 0); // It receive data in "data" and it's a pointer
while((spi_read_status(SPI) & SPI_SR_RDRF) == 0);
spi_read(SPI, (uint16_t*) r_data, (uint8_t*) &r_pcs);
data++;
}
spi_write(SPI, *data, spi_get_pcs(3), 1); // The las byte must toggle CS
spi_read(SPI, (uint16_t*) r_data, (uint8_t*) &r_pcs);
while( EEPROM_getWriteInProcess() ); // Deberíamos hacer esto aquí pa evitarle el complique al usuario
}