Hello,
I am working on a Cypress MCU (CY8C3866AXI-040), and I have a problem about I2C. I'm trying to create an I2C communication with an external EEPROM (and an external Cypress FerroRAM too). I have already watched all the default example codes of Cypress about I2C. In the following code, I send 8 byte to the FRAM, then try to request these bytes from it. All 3 commands seems to be succeeded, because I got master status 0. But I can't see the result. The read buffer remains its original content. What is wrong in my code?(The hardware set up and the I2C configuration (in the top design: UDB, internal clock source, 100 kbps) are OK)
Thanks
#define I2C_DATA_CNT 8u #define I2C_WR 0u #define I2C_RD 1u uint8 mr_status = 0; uint8 dev_sel = 0xA0; // 1010 00 0 0 uint8 location[2] = {0x00, 0x00}; uint8 wr_buffer[I2C_DATA_CNT+2] = {0x00, 0x00, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B}; uint8 rd_buffer[I2C_DATA_CNT] = {0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87}; I2C_1_Start(); UART_1_Start(); while(1) { if(UART_1_RX_STS_FIFO_NOTEMPTY) { // Input character rx_buffer = UART_1_GetChar(); if(rx_buffer == 0x77) { // typing 'w': write dev_sel = 0xA0; mr_status = I2C_1_MasterWriteBuf(dev_sel, (uint8*) wr_buffer, sizeof(wr_buffer)+sizeof(location), I2C_1_MODE_COMPLETE_XFER); while(!(I2C_1_MasterStatus() & I2C_1_MSTAT_WR_CMPLT)); CyDelay(10); putByteUART(mr_status); // just puts the byte, 0 means ok I2C_1_MasterClearStatus(); } else if(rx_buffer == 0x72) { // 'r' read // In order to do a read from a specific address, do a write operation with the memory address bytes alone: dev_sel = 0xA0; mr_status = I2C_1_MasterWriteBuf(dev_sel, (uint8*)location, sizeof(location), I2C_1_MODE_NO_STOP); while(!(I2C_1_MasterStatus() & I2C_1_MSTAT_WR_CMPLT)); CyDelay(10); putByteUART(mr_status); dev_sel = 0xA1; mr_status = I2C_1_MasterReadBuf(dev_sel, (uint8*)rd_buffer, sizeof(rd_buffer), I2C_1_MODE_REPEAT_START); // mr_status = I2C_1_MasterReadBuf(dev_sel, (uint8*)rd_buffer, 8, I2C_1_MODE_REPEAT_START); while(!(I2C_1_MasterStatus() & I2C_1_MSTAT_RD_CMPLT)); //Wait till the master completes writing CyDelay(10); putByteUART(mr_status); putByteUART(rd_buffer[0]); // unfortunately the this byte remains 0x80 UART_1_PutString(" "); putByteUART(rd_buffer[1]); // 0x81 instead of 0x65, this is the problem } } }