SPI主可以正常发送数据，SPI从可以正常接收数据。但SPI主读回来的数据，并不是SPI从发送出来的数据，甚至有时候主端读回的数据一直为0xff。
实验环境为：
开发板为两块ESP-LAUNCHER
SDK使用 FREERTOS_2.0.0
参考代码为：https://github.com/espressif/esp8266-rtos-sample-code/blob/master/02Peripheral/HSPI_Slave/user/user_main.c
SPI slave 运行的代码为：
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LOCAL void spi_slave_task(void *prg)
{
//
SpiAttr hSpiAttr;
hSpiAttr.bitOrder = SpiBitOrder_MSBFirst;
hSpiAttr.speed = 0;
hSpiAttr.mode = SpiMode_Slave;
hSpiAttr.subMode = SpiSubMode_0;
// Init HSPI GPIO
WRITE_PERI_REG(PERIPHS_IO_MUX, 0x105);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, 2);//configure io to spi mode
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, 2);//configure io to spi mode
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, 2);//configure io to spi mode
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, 2);//configure io to spi mode
printf("\r\n ============= spi init slave =============\r\n");
SPIInit(SpiNum_HSPI, &hSpiAttr);
//CLEAR_PERI_REG_MASK(SPI_SLAVE(SpiNum_HSPI), 0x3FF);
SPISlaveRecvData(SpiNum_HSPI,spi_slave_isr_sta);
uint32 sndData[8] = { 0 };
sndData[0] = 0x35343332;
sndData[1] = 0x39383736;
sndData[2] = 0x3d3c3b3a;
sndData[3] = 0x11103f3e;
sndData[4] = 0x15141312;
sndData[5] = 0x19181716;
sndData[6] = 0x1d1c1b1a;
sndData[7] = 0x21201f1e;
SPISlaveSendData(SpiNum_HSPI, sndData, 8);
WRITE_PERI_REG(SPI_RD_STATUS(SpiNum_HSPI), 0x8A);
WRITE_PERI_REG(SPI_WR_STATUS(SpiNum_HSPI), 0x83);
while(1)
{
vTaskDelay(1000/portTICK_RATE_MS);
//printf("\r\n spi slave still alive!!!");
}
}SPI master 运行的代码为：
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void spi_master_test()
{
SpiAttr hSpiAttr;
hSpiAttr.bitOrder = SpiBitOrder_MSBFirst;
hSpiAttr.speed = SpiSpeed_2MHz;
hSpiAttr.mode = SpiMode_Master;
hSpiAttr.subMode = SpiSubMode_0;
// Init HSPI GPIO
WRITE_PERI_REG(PERIPHS_IO_MUX, 0x105);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, 2);//configure io to spi mode
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, 2);//configure io to spi mode
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, 2);//configure io to spi mode
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, 2);//configure io to spi mode
SPIInit(SpiNum_HSPI, &hSpiAttr);
uint32 value = 0x00;
uint32 sendData[8] ={ 0 };
SpiData spiData;
printf("\r\n ============= spi init master ============= \r\n");
// Test 8266 slave.Communication format: 1byte command + 1bytes address + x bytes Data.
while(1)
{
printf("\r\n Master send 32 bytes data to slave(8266)\r\n");
memset(sendData, 0, sizeof(sendData));
sendData[0] = 0x55565758;
sendData[1] = 0x595a5b5c;
sendData[2] = 0x5d5e5f60;
sendData[3] = 0x61626364;
sendData[4] = 0x65666768;
sendData[5] = 0x696a6b6c;
sendData[6] = 0x6d6e6f70;
sendData[7] = 0x71727374;
spiData.cmd = MASTER_WRITE_DATA_TO_SLAVE_CMD;
spiData.cmdLen = 1;
spiData.addr = &value;
spiData.addrLen = 1;
spiData.data = sendData;
spiData.dataLen = 32;
SPIMasterSendData(SpiNum_HSPI, &spiData);
printf("\r\n Master receive 24 bytes data from slave(8266)\r\n");
spiData.cmd = MASTER_READ_DATA_FROM_SLAVE_CMD;
spiData.cmdLen = 1;
spiData.addr = &value;
spiData.addrLen = 1;
spiData.data = sendData;
spiData.dataLen = 24;
memset(sendData, 0, sizeof(sendData));
SPIMasterRecvData(SpiNum_HSPI, &spiData);
printf(" Recv Slave data0[0x%08x]\r\n", sendData[0]);
printf(" Recv Slave data1[0x%08x]\r\n", sendData[1]);
printf(" Recv Slave data2[0x%08x]\r\n", sendData[2]);
printf(" Recv Slave data3[0x%08x]\r\n", sendData[3]);
printf(" Recv Slave data4[0x%08x]\r\n", sendData[4]);
printf(" Recv Slave data5[0x%08x]\r\n", sendData[5]);
/*
value = SPIMasterRecvStatus(SpiNum_HSPI);
printf("\r\n Master read slave(8266) status[0x%02x]\r\n", value);
SPIMasterSendStatus(SpiNum_HSPI, 0x99);
printf("\r\n Master write status[0x99] to slavue(8266).\r\n");
*/
vTaskDelay(1000/portTICK_RATE_MS);
}
}
如果一切正常，spi master 收到的数据应该为：
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sndData[0] = 0x35343332;
sndData[1] = 0x39383736;
sndData[2] = 0x3d3c3b3a;
sndData[3] = 0x11103f3e;
sndData[4] = 0x15141312;
sndData[5] = 0x19181716;
sndData[6] = 0x1d1c1b1a;
sndData[7] = 0x21201f1e;
但实际收到的为：
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Master receive 24 bytes data from slave(8266)
Recv Slave data0[0x6a686664]
Recv Slave data1[0x72706e6c]
Recv Slave data2[0x7a787674]
Recv Slave data3[0xff3f7e7c]
Recv Slave data4[0xffffffff]
Recv Slave data5[0xffffffff]
请知道的大神指点一下思路，谢谢。