//esp8266 slave isr handle funtion,tiggered when any transmission is finished.
//the function is registered in spi_slave_init.
static void ICACHE_FLASH_ATTR
spi_slave_isr_handler(void *para)
{
uint32 regvalue;
if(READ_PERI_REG(0x3ff00020)&BIT4)
{
//following 3 lines is to clear isr signal
CLEAR_PERI_REG_MASK(SPI_SLAVE(SPI), 0x3ff);
}
else if(READ_PERI_REG(0x3ff00020)&BIT7) //bit7 is for hspi isr,
{
regvalue=READ_PERI_REG(SPI_SLAVE(HSPI));
CLEAR_PERI_REG_MASK(SPI_SLAVE(HSPI),
SPI_TRANS_DONE_EN|
SPI_SLV_WR_STA_DONE_EN|
SPI_SLV_RD_STA_DONE_EN|
SPI_SLV_WR_BUF_DONE_EN|
SPI_SLV_RD_BUF_DONE_EN);
SET_PERI_REG_MASK(SPI_SLAVE(HSPI), SPI_SYNC_RESET);
CLEAR_PERI_REG_MASK(SPI_SLAVE(HSPI),
SPI_TRANS_DONE|
SPI_SLV_WR_STA_DONE|
SPI_SLV_RD_STA_DONE|
SPI_SLV_WR_BUF_DONE|
SPI_SLV_RD_BUF_DONE);
SET_PERI_REG_MASK(SPI_SLAVE(HSPI),
SPI_TRANS_DONE_EN|
SPI_SLV_WR_STA_DONE_EN|
SPI_SLV_RD_STA_DONE_EN|
SPI_SLV_WR_BUF_DONE_EN|
SPI_SLV_RD_BUF_DONE_EN);
if(regvalue&SPI_SLV_WR_BUF_DONE)
{
uint32_t i, reg, recv_data;
GPIO_OUTPUT_SET(0, 0);
for(reg = SPI_W0(HSPI); reg < SPI_W8(HSPI); reg += 4)
{
recv_data = READ_PERI_REG(reg);
for(i = 0; i < 4; ++i, ++idx, recv_data >>= 8)
spi_data[idx] = recv_data & 0xff;
}
/* TODO: post task event ...
*
* system_os_post(USER_TASK_PRIO_1, ut_sig_mosi, (ETSParam)spi_data);
* */
GPIO_OUTPUT_SET(0, 1);
}
/**
* @brief Load data to send buffer by slave mode.
*
*/
int ICACHE_FLASH_ATTR SPISlaveSendData(SpiNum spiNum, uint32_t *pInData, uint8_t inLen)
{
if (NULL == pInData) {
return -1;
}
char i;
for (i = 0; i < inLen; ++i) {
WRITE_PERI_REG((SPI_W8(spiNum) + (i << 2)), *pInData++);
}
// Enable slave transmission liston
SET_PERI_REG_MASK(SPI_CMD(spiNum), SPI_USR);
return 0;
}