/**
* @brief Receive status register from slave(ESP8266).
*
*/
int ICACHE_FLASH_ATTR SPIMasterRecvStatus (SpiNum spiNum)
{
if (spiNum > SpiNum_HSPI)
{
return -1;
}
while (READ_PERI_REG(SPI_CMD(spiNum)) & SPI_USR)
;
// Enable MISO
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MISO);
CLEAR_PERI_REG_MASK(SPI_USER(spiNum),
SPI_USR_MOSI | SPI_USR_DUMMY | SPI_USR_ADDR);
// 8bits cmd, 0x06 is eps8266 slave read status cmd value
WRITE_PERI_REG(SPI_USER2(spiNum),
((7 & SPI_USR_COMMAND_BITLEN) << SPI_USR_COMMAND_BITLEN_S)
| MASTER_READ_STATUS_FROM_SLAVE_CMD);
// Set revcive buffer length.
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_MISO_BITLEN,
7, SPI_USR_MISO_BITLEN_S);
// start spi module.
SET_PERI_REG_MASK(SPI_CMD(spiNum), SPI_USR);
while (READ_PERI_REG(SPI_CMD(spiNum)) & SPI_USR)
;
uint8_t data = (uint8) (READ_PERI_REG(SPI_W0(spiNum)) & 0xff);
return (uint8) (READ_PERI_REG(SPI_W0(spiNum)) & 0xff);
}
/**
* @brief Send data to slave(ESP8266 register of RD_STATUS or WR_STATUS).
*
*/
void ICACHE_FLASH_ATTR SPIMasterSendStatus (SpiNum spiNum, uint8_t data)
{
if (spiNum > SpiNum_HSPI)
{
return;
}
while (READ_PERI_REG(SPI_CMD(spiNum)) & SPI_USR)
;
// Enable MOSI
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MOSI);
CLEAR_PERI_REG_MASK(SPI_USER(spiNum),
SPI_USR_MISO | SPI_USR_DUMMY | SPI_USR_ADDR);
// 8bits cmd, 0x04 is eps8266 slave write cmd value
WRITE_PERI_REG(SPI_USER2(spiNum),
((7 & SPI_USR_COMMAND_BITLEN) << SPI_USR_COMMAND_BITLEN_S)
| MASTER_WRITE_STATUS_TO_SLAVE_CMD);
// Set data send buffer length.
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_MOSI_BITLEN,
( (sizeof (data) << 3) - 1), SPI_USR_MOSI_BITLEN_S);
WRITE_PERI_REG(SPI_W0(spiNum), (uint32 ) (data));
// Start SPI
SET_PERI_REG_MASK(SPI_CMD(spiNum), SPI_USR);
}
/* @defgroup SPI hardware implementation
* @brief transfer32()
*
* private method used by transfer(byte) and transfer16(sort)
* to send/recv one uint32_t
*
* SPI transfer is based on a simultaneous send and receive:
* the received data is returned in receivedVal (or receivedVal16).
*
* receivedVal = SPI.transfer(val) : single byte
* receivedVal16 = SPI.transfer16(val16) : single short
*/
uint32 SPIClass::transfer32(uint32 data, uint8 bits)
{
uint32_t regvalue = READ_PERI_REG(SPI_USER(SPI_NO)) & (SPI_WR_BYTE_ORDER | SPI_RD_BYTE_ORDER | SPI_CK_OUT_EDGE);
while(READ_PERI_REG(SPI_CMD(SPI_NO))&SPI_USR);
regvalue |= SPI_USR_MOSI | SPI_DOUTDIN | SPI_CK_I_EDGE;
WRITE_PERI_REG(SPI_USER(SPI_NO), regvalue);
WRITE_PERI_REG(SPI_USER1(SPI_NO),
( (bits-1 & SPI_USR_MOSI_BITLEN) << SPI_USR_MOSI_BITLEN_S ) |
( (bits-1 & SPI_USR_MISO_BITLEN) << SPI_USR_MISO_BITLEN_S ) );
// copy data to W0
if(READ_PERI_REG(SPI_USER(SPI_NO))&SPI_WR_BYTE_ORDER) {
WRITE_PERI_REG(SPI_W0(SPI_NO), data<<(32-bits));
} else {
WRITE_PERI_REG(SPI_W0(SPI_NO), data);
}
SET_PERI_REG_MASK(SPI_CMD(SPI_NO), SPI_USR); // send
while (READ_PERI_REG(SPI_CMD(SPI_NO)) & SPI_USR);
// wait a while before reading the register into the buffer
// delayMicroseconds(2);
if(READ_PERI_REG(SPI_USER(SPI_NO))&SPI_RD_BYTE_ORDER) {
return READ_PERI_REG(SPI_W0(SPI_NO)) >> (32-bits); //Assuming data in is written to MSB. TBC
} else {
return READ_PERI_REG(SPI_W0(SPI_NO)); //Read in the same way as DOUT is sent. Note existing contents of SPI_W0 remain unless overwritten!
/**
* @brief Receive data from slave.
*
*/
int ICACHE_FLASH_ATTR SPIMasterRecvData (SpiNum spiNum, SpiData* pOutData)
{
char idx = 0;
if ( (spiNum > SpiNum_HSPI)
|| (NULL == pOutData))
{
return -1;
}
uint32_t *value = pOutData->data;
while (READ_PERI_REG(SPI_CMD(spiNum)) & SPI_USR)
;
// Set command by user.
if (pOutData->cmdLen != 0)
{
// Max command length 16 bits.
SET_PERI_REG_BITS(SPI_USER2(spiNum), SPI_USR_COMMAND_BITLEN,
( (pOutData->cmdLen << 3) - 1), SPI_USR_COMMAND_BITLEN_S);
// Enable command
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_COMMAND);
// Load command
SPIMasterCfgCmd (spiNum, pOutData->cmd);
}
else
{
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_COMMAND);
SET_PERI_REG_BITS(SPI_USER2(spiNum), SPI_USR_COMMAND_BITLEN,
0, SPI_USR_COMMAND_BITLEN_S);
}
// Set Address by user.
if (pOutData->addrLen == 0)
{
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_ADDR);
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_ADDR_BITLEN,
0, SPI_USR_ADDR_BITLEN_S);
}
else
{
if (NULL == pOutData->addr)
{
return -1;
}
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_ADDR_BITLEN,
( (pOutData->addrLen << 3) - 1), SPI_USR_ADDR_BITLEN_S);
// Enable address
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_ADDR);
// Load address
SPIMasterCfgAddr (spiNum, *pOutData->addr);
}
// Set data by user.
if (pOutData->dataLen != 0)
{
if (NULL == value)
{
return -1;
}
// Clear MOSI enable
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MOSI);
// Enable MOSI
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MISO);
// Set data send buffer length.Max data length 64 bytes.
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_MISO_BITLEN,
( (pOutData->dataLen << 3) - 1), SPI_USR_MISO_BITLEN_S);
}
else
{
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MOSI);
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MISO);
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_MISO_BITLEN,
0, SPI_USR_MISO_BITLEN_S);
}
// Start send data
SET_PERI_REG_MASK(SPI_CMD(spiNum), SPI_USR);
while (READ_PERI_REG(SPI_CMD(spiNum)) & SPI_USR)
;
// Read data out
do
{
*pOutData->data++ = READ_PERI_REG(SPI_W0(spiNum) + (idx << 2));
}
while ( ++idx < (pOutData->dataLen / 4));
return 0;
}
/**
* @brief Send data to slave.
*
*/
int ICACHE_FLASH_ATTR SPIMasterSendData (SpiNum spiNum, SpiData* pInData)
{
char idx = 0;
if ( (spiNum > SpiNum_HSPI)
|| (NULL == pInData)
|| (64 < pInData->dataLen))
{
return -1;
}
uint32_t *value = pInData->data;
while (READ_PERI_REG(SPI_CMD(spiNum)) & SPI_USR)
;
// Set command by user.
if (pInData->cmdLen != 0)
{
// Max command length 16 bits.
SET_PERI_REG_BITS(SPI_USER2(spiNum), SPI_USR_COMMAND_BITLEN,
( (pInData->cmdLen << 3) - 1), SPI_USR_COMMAND_BITLEN_S);
// Enable command
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_COMMAND);
// Load command
SPIMasterCfgCmd (spiNum, pInData->cmd);
}
else
{
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_COMMAND);
SET_PERI_REG_BITS(SPI_USER2(spiNum), SPI_USR_COMMAND_BITLEN,
0, SPI_USR_COMMAND_BITLEN_S);
}
// Set Address by user.
if (pInData->addrLen == 0)
{
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_ADDR);
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_ADDR_BITLEN,
0, SPI_USR_ADDR_BITLEN_S);
}
else
{
if (NULL == pInData->addr)
{
return -1;
}
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_ADDR_BITLEN,
( (pInData->addrLen << 3) - 1), SPI_USR_ADDR_BITLEN_S);
// Enable address
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_ADDR);
// Load address
SPIMasterCfgAddr (spiNum, *pInData->addr);
}
// Set data by user.
if (pInData->dataLen != 0)
{
if (NULL == value)
{
return -1;
}
// Enable MOSI
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MOSI);
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MISO);
// Load send buffer
do
{
WRITE_PERI_REG((SPI_W0(spiNum) + (idx << 2)), *value++);
}
while ( ++idx < (pInData->dataLen / 4));
// Set data send buffer length.Max data length 64 bytes.
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_MOSI_BITLEN,
( (pInData->dataLen << 3) - 1), SPI_USR_MOSI_BITLEN_S);
}
else
{
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MOSI);
SET_PERI_REG_BITS(SPI_USER1(spiNum), SPI_USR_MOSI_BITLEN,
0, SPI_USR_MOSI_BITLEN_S);
}
// Start send data
SET_PERI_REG_MASK(SPI_CMD(spiNum), SPI_USR);
// Wait for transmit done
while ( ! (READ_PERI_REG(SPI_SLAVE(spiNum)) & SPI_TRANS_DONE))
;
CLEAR_PERI_REG_MASK(SPI_SLAVE(spiNum), SPI_TRANS_DONE);
return 0;
}