/**
* @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);
}
/**
* @brief Set command value by master mode.
*
*/
void ICACHE_FLASH_ATTR SPIMasterCfgCmd(SpiNum spiNum, uint32_t cmd)
{
if (spiNum > SpiNum_HSPI) {
return;
}
// SPI_USER2 bit28-31 is cmd length,cmd bit length is value(0-15)+1,
// bit15-0 is cmd value.
SET_PERI_REG_BITS(SPI_USER2(spiNum), SPI_USR_COMMAND_VALUE, cmd, SPI_USR_COMMAND_VALUE_S);
}
/**
* @brief Based on pAttr initialize SPI module.
*
*/
void ICACHE_FLASH_ATTR SPIInit (SpiNum spiNum, SpiAttr* pAttr)
{
if ((spiNum > SpiNum_HSPI) || (NULL == pAttr))
{
return;
}
// SPI_CPOL & SPI_CPHA
switch (pAttr->subMode)
{
case SpiSubMode_1:
CLEAR_PERI_REG_MASK(SPI_PIN(spiNum), SPI_IDLE_EDGE);
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_CK_OUT_EDGE); // CHPA_FALLING_EDGE_SAMPLE
break;
case SpiSubMode_2:
SET_PERI_REG_MASK(SPI_PIN(spiNum), SPI_IDLE_EDGE);
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_CK_OUT_EDGE); // CHPA_FALLING_EDGE_SAMPLE
break;
case SpiSubMode_3:
SET_PERI_REG_MASK(SPI_PIN(spiNum), SPI_IDLE_EDGE);
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_CK_OUT_EDGE);
break;
case SpiSubMode_0:
default:
CLEAR_PERI_REG_MASK(SPI_PIN(spiNum), SPI_IDLE_EDGE);
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_CK_OUT_EDGE);
// To do nothing
break;
}
// SPI bit order
if (SpiBitOrder_MSBFirst == pAttr->bitOrder)
{
CLEAR_PERI_REG_MASK(SPI_CTRL(spiNum), SPI_WR_BIT_ORDER);
CLEAR_PERI_REG_MASK(SPI_CTRL(spiNum), SPI_RD_BIT_ORDER);
}
else if (SpiBitOrder_LSBFirst == pAttr->bitOrder)
{
SET_PERI_REG_MASK(SPI_CTRL(spiNum), SPI_WR_BIT_ORDER);
SET_PERI_REG_MASK(SPI_CTRL(spiNum), SPI_RD_BIT_ORDER);
}
else
{
// To do nothing
}
// Disable flash operation mode
// As earlier as better, if not SPI_CTRL2 can not to be set delay cycles.
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_FLASH_MODE);
// SPI mode type
if (SpiMode_Master == pAttr->mode)
{
// SPI mode type
CLEAR_PERI_REG_MASK(SPI_SLAVE(spiNum), SPI_SLAVE_MODE);
// SPI Send buffer
CLEAR_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MISO_HIGHPART);// By default slave send buffer C0-C7
// SPI Speed
if (1 < (pAttr->speed))
{
uint8 i, k;
i = (pAttr->speed / 40) ? (pAttr->speed / 40) : 1;
k = pAttr->speed / i;
CLEAR_PERI_REG_MASK(SPI_CLOCK(spiNum), SPI_CLK_EQU_SYSCLK);
WRITE_PERI_REG(SPI_CLOCK(spiNum),
(((i - 1) & SPI_CLKDIV_PRE) << SPI_CLKDIV_PRE_S) |
(((k - 1) & SPI_CLKCNT_N) << SPI_CLKCNT_N_S) |
((((k + 1) / 2 - 1) & SPI_CLKCNT_H) << SPI_CLKCNT_H_S) |
(((k - 1) & SPI_CLKCNT_L) << SPI_CLKCNT_L_S)); //clear bit 31,set SPI clock div
}
else
{
WRITE_PERI_REG(SPI_CLOCK(spiNum), SPI_CLK_EQU_SYSCLK); // 80Mhz speed
}
// By default format:CMD+ADDR+DATA
SET_PERI_REG_MASK(SPI_USER(spiNum),
SPI_CS_SETUP | SPI_CS_HOLD | SPI_USR_MOSI);
//delay num
SET_PERI_REG_MASK(SPI_CTRL2(spiNum),
((0x1 & SPI_MISO_DELAY_NUM) << SPI_MISO_DELAY_NUM_S));
}
else if (SpiMode_Slave == pAttr->mode)
{
// BIT19 must do
SET_PERI_REG_MASK(SPI_PIN(spiNum), BIT19);
// SPI mode type
SET_PERI_REG_MASK(SPI_SLAVE(spiNum), SPI_SLAVE_MODE);
// SPI Send buffer
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MISO_HIGHPART);// By default slave send buffer C8-C15
SET_PERI_REG_MASK(SPI_USER(spiNum), SPI_USR_MOSI);
// If do not set delay cycles, slave not working,master cann't get the data.
SET_PERI_REG_MASK(SPI_CTRL2(spiNum),
((0x1 & SPI_MOSI_DELAY_NUM) << SPI_MOSI_DELAY_NUM_S)); //delay num
// SPI Speed
WRITE_PERI_REG(SPI_CLOCK(spiNum), 0);
// By default format::CMD(8bits)+ADDR(8bits)+DATA(32bytes).
SET_PERI_REG_BITS(SPI_USER2(spiNum), SPI_USR_COMMAND_BITLEN,
7, SPI_USR_COMMAND_BITLEN_S);
SET_PERI_REG_BITS(SPI_SLAVE1(spiNum), SPI_SLV_WR_ADDR_BITLEN,
7, SPI_SLV_WR_ADDR_BITLEN_S);
SET_PERI_REG_BITS(SPI_SLAVE1(spiNum), SPI_SLV_RD_ADDR_BITLEN,
7, SPI_SLV_RD_ADDR_BITLEN_S);
SET_PERI_REG_BITS(SPI_SLAVE1(spiNum), SPI_SLV_BUF_BITLEN,
(32 * 8 - 1), SPI_SLV_BUF_BITLEN_S);
// For 8266 work on slave mode.
SET_PERI_REG_BITS(SPI_SLAVE1(spiNum), SPI_SLV_STATUS_BITLEN,
7, SPI_SLV_STATUS_BITLEN_S);
}
else
{
// To do nothing
}
//clear Daul or Quad lines transmission mode
CLEAR_PERI_REG_MASK(SPI_CTRL(spiNum),
SPI_QIO_MODE | SPI_DIO_MODE | SPI_DOUT_MODE | SPI_QOUT_MODE);
// Clear the data buffer.
uint8 i;
uint32 regAddr = REG_SPI_BASE(spiNum) + 0x40;
for (i = 0; i < 16; ++i)
{
WRITE_PERI_REG(regAddr, 0);
regAddr += 4;
}
}
/**
* @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;
}