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//
// Copyright 2013-2014 Ettus Research LLC
//
#include "b200_i2c.h"
#include "cyu3i2c.h"
/* I2c initialization for EEPROM programming. */
void CyFxI2cInit (uint16_t pageLen) {
CyU3PI2cConfig_t i2cConfig;
/* Initialize and configure the I2C master module. */
CyU3PI2cInit ();
/* Start the I2C master block. The bit rate is set at 100KHz.
* The data transfer is done via DMA. */
CyU3PMemSet ((uint8_t *)&i2cConfig, 0, sizeof(i2cConfig));
i2cConfig.bitRate = CY_FX_USBI2C_I2C_BITRATE;
i2cConfig.busTimeout = 0xFFFFFFFF;
i2cConfig.dmaTimeout = 0xFFFF;
i2cConfig.isDma = CyFalse;
CyU3PI2cSetConfig (&i2cConfig, NULL);
glI2cPageSize = pageLen;
}
/* I2C read / write for programmer application. */
void CyFxUsbI2cTransfer (
uint16_t byteAddress,
uint8_t devAddr,
uint16_t byteCount,
uint8_t *buffer,
CyBool_t isRead)
{
CyU3PI2cPreamble_t preamble;
uint16_t pageCount = (byteCount / glI2cPageSize);
uint16_t resCount = glI2cPageSize;
if (byteCount == 0) {
return;
}
if ((byteCount % glI2cPageSize) != 0) {
pageCount ++;
resCount = byteCount % glI2cPageSize;
}
while (pageCount != 0) {
if (isRead) {
/* Update the preamble information. */
preamble.length = 4;
preamble.buffer[0] = devAddr;
preamble.buffer[1] = (uint8_t)(byteAddress >> 8);
preamble.buffer[2] = (uint8_t)(byteAddress & 0xFF);
preamble.buffer[3] = (devAddr | 0x01);
preamble.ctrlMask = 0x0004;
CyU3PI2cReceiveBytes (&preamble, buffer, (pageCount == 1) ? resCount : glI2cPageSize, 0);
} else {
/* Write. Update the preamble information. */
preamble.length = 3;
preamble.buffer[0] = devAddr;
preamble.buffer[1] = (uint8_t)(byteAddress >> 8);
preamble.buffer[2] = (uint8_t)(byteAddress & 0xFF);
preamble.ctrlMask = 0x0000;
CyU3PI2cTransmitBytes (&preamble, buffer, (pageCount == 1) ? resCount : glI2cPageSize, 0);
/* Wait for the write to complete. */
preamble.length = 1;
CyU3PI2cWaitForAck(&preamble, 200);
}
/* An additional delay seems to be required after receiving an ACK. */
CyU3PThreadSleep (1);
/* Update the parameters */
byteAddress += glI2cPageSize;
buffer += glI2cPageSize;
pageCount --;
}
}
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