ZYNQ IIC EEPROM读写例程
硬件平台为PYNQ-Z2，从Raspberry Pi Header通过杜邦线连接AT24C02小板。
软件代码直接用的ZC706 BIST中的代码。
调试过程中遇到了两个坑：
1.PYNQ-Z2 USER MANUAL中Raspberry Pi Header的管脚定义图居然是错的，还是要以原理图为准
正确的管脚定义如下：
2.要注意24C02的地址，如果A[2:0]都接GND，那地址就是0xA0，但是地址只有7位，所以要除以2，即 0x50。其实，在ZC706 BIST中的代码注释中已经明确指出（Note that since the address is only 7 bits, this constant is the address divided by 2.），一开始没注意，导致写失败。
VIVADO工程直接用默认工程，使能IIC，设置为EMIO，然后点击IIC_0，'CTRL+T’生成管脚，在生成wrapper时，VIVADO自己会添加iobuf。
IOBUF IIC_0_scl_iobuf
(.I(IIC_0_scl_o),
.IO(IIC_0_scl_io),
.O(IIC_0_scl_i),
.T(IIC_0_scl_t));
IOBUF IIC_0_sda_iobuf
(.I(IIC_0_sda_o),
.IO(IIC_0_sda_io),
.O(IIC_0_sda_i),
.T(IIC_0_sda_t));
软件代码如下 ：
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/*****************************************************************************/
/**
* @file xiicps_eeprom_intr_example.c
*
* This file consists of a interrutp mode design example which uses the Xilinx
* PS IIC device and XIicPs driver to exercise the EEPROM.
*
* The XIicPs_MasterSend() API is used to transmit the data and the
* XIicPs_MasterRecv() API is used to receive the data.
*
* The example is tested with a 2Kb/8Kb serial IIC EEPROM (ST M24C02/M24C08).
* The WP pin of this EEPROM is hardwired to ground on the HW in which this
* was tested.
*
* The AddressType should be u8 as the address pointer in the on-board
* EEPROM is 1 bytes.
*
* This code assumes that no Operating System is being used.
*
* @note
*
* None.
*
*
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- -------- ---------------------------------------------------------
* 1.00a sdm 03/15/10 First release
* 1.01a sg 04/13/12 Added MuxInit function for initializing the IIC Mux
* on the ZC702 board and to configure it for accessing
* the IIC EEPROM.
* Updated to use usleep instead of delay loop
* 1.04a hk 09/03/13 Removed GPIO code to pull MUX out of reset - CR#722425.
*
*
*
******************************************************************************/
/***************************** Include Files *********************************/
#include "xparameters.h"
#include "sleep.h"
#include "xiicps.h"
#include "xscugic.h"
#include "xil_exception.h"
#include "xil_printf.h"
/************************** Constant Definitions *****************************/
/*
* The following constants map to the XPAR parameters created in the
* xparameters.h file. They are defined here such that a user can easily
* change all the needed parameters in one place.
*/
#define IIC_DEVICE_ID XPAR_XIICPS_0_DEVICE_ID
#define INTC_DEVICE_ID XPAR_SCUGIC_SINGLE_DEVICE_ID
#define IIC_INTR_ID XPAR_XIICPS_0_INTR
/*
* The following constant defines the address of the IIC Slave device on the
* IIC bus. Note that since the address is only 7 bits, this constant is the
* address divided by 2.
*/
#define IIC_SLAVE_ADDR 0x54
#define IIC_SCLK_RATE 100000
/*
* The page size determines how much data should be written at a time.
* The write function should be called with this as a maximum byte count.
*/
#define PAGE_SIZE 16
/*
* The Starting address in the IIC EEPROM on which this test is performed.
*/
#define EEPROM_START_ADDRESS 0
/**************************** Type Definitions *******************************/
/*
* The AddressType should be u8 as the address pointer in the on-board
* EEPROM is 1 byte.
*/
typedef u8 AddressType;
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
int IicPsEepromIntrExample(void);
int EepromWriteData(u16 ByteCount);
int MuxInit(void);
int EepromReadData(u8 *BufferPtr, u16 ByteCount);
static int SetupInterruptSystem(XIicPs * IicInstPtr);
static void Handler(void *CallBackRef, u32 Event);
/************************** Variable Definitions *****************************/
XIicPs IicInstance; /* The instance of the IIC device. */
XScuGic InterruptController; /* The instance of the Interrupt Controller. */
/*
* Write buffer for writing a page.
*/
u8 WriteBuffer[sizeof(AddressType) + PAGE_SIZE];
u8 ReadBuffer[PAGE_SIZE]; /* Read buffer for reading a page. */
volatile u8 TransmitComplete; /* Flag to check completion of Transmission */
volatile u8 ReceiveComplete; /* Flag to check completion of Reception */
volatile u32 TotalErrorCount;
/************************** Function Definitions *****************************/
/*****************************************************************************/
/**
* Main function to call the Iic EEPROM interrupt example.
*
* @param None.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int main(void)
{
int Status;
xil_printf("\n\r********************************************************");
xil_printf("\n\r********************************************************");
xil_printf("\n\r** PYNQ - IIC EEPROM Test **");
xil_printf("\n\r********************************************************");
xil_printf("\n\r********************************************************\r\n");
/*
* Run the Iic EEPROM interrupt mode example.
*/
Status = IicPsEepromIntrExample();
if (Status != XST_SUCCESS) {
xil_printf("IIC EEPROM Interrupt Example Test Failed\r\n");
return XST_FAILURE;
}
xil_printf("Successfully ran IIC EEPROM Interrupt Example Test\r\n");
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function writes, reads, and verifies the data to the IIC EEPROM. It
* does the write as a single page write, performs a buffered read.
*
* @param None.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int IicPsEepromIntrExample(void)
{
u32 Index;
int Status;
u32 i;
XIicPs_Config *ConfigPtr; /* Pointer to configuration data */
AddressType Address = EEPROM_START_ADDRESS;
/*
* Initialize the IIC driver so that it is ready to use.
*/
ConfigPtr = XIicPs_LookupConfig(IIC_DEVICE_ID);
if (ConfigPtr == NULL) {
return XST_FAILURE;
}
Status = XIicPs_CfgInitialize(&IicInstance, ConfigPtr,
ConfigPtr->BaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Setup the Interrupt System.
*/
Status = SetupInterruptSystem(&IicInstance);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Setup the handlers for the IIC that will be called from the
* interrupt context when data has been sent and received, specify a
* pointer to the IIC driver instance as the callback reference so
* the handlers are able to access the instance data.
*/
XIicPs_SetStatusHandler(&IicInstance, (void *) &IicInstance, Handler);
/*
* Set the IIC serial clock rate.
*/
XIicPs_SetSClk(&IicInstance, IIC_SCLK_RATE);
/*
* Initialize the data to write and the read buffer.
*/
if (sizeof(Address) == 1) {
WriteBuffer[0] = (u8) (Address);
} else {
WriteBuffer[0] = (u8) (Address >> 8);
WriteBuffer[1] = (u8) (Address);
ReadBuffer[Index] = 0;
}
for (Index = 0; Index < PAGE_SIZE; Index++) {
WriteBuffer[sizeof(Address) + Index] = Index + 0x10 + 5;
ReadBuffer[Index] = 0;
}
/*
* Write to the EEPROM.
*/
Status = EepromWriteData(sizeof(Address) + PAGE_SIZE);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Read from the EEPROM.
*/
for (i = 0; i < 1000000; i++) {
}
Status = EepromReadData(ReadBuffer, PAGE_SIZE);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Verify the data read against the data written.
*/
for (Index = 0; Index < PAGE_SIZE; Index++) {
if (ReadBuffer[Index] != WriteBuffer[Index + sizeof(Address)]) {
return XST_FAILURE;
}
//ReadBuffer[Index] = 0;
for ( Index = 0; Index < PAGE_SIZE; Index++ ) {
xil_printf("WriteBuffer[%02d]=0x%02X ReadBuffer[%02d]=0x%02X\r\n", Index, WriteBuffer[Index+sizeof(Address)], Index, ReadBuffer[Index]);
}
}
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function writes a buffer of data to the IIC serial EEPROM.
*
* @param ByteCount contains the number of bytes in the buffer to be
* written.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note The Byte count should not exceed the page size of the EEPROM as
* noted by the constant PAGE_SIZE.
*
******************************************************************************/
int EepromWriteData(u16 ByteCount)
{
TransmitComplete = FALSE;
/*
* Send the Data.
*/
XIicPs_MasterSend(&IicInstance, WriteBuffer,
ByteCount, IIC_SLAVE_ADDR);
/*
* Wait for the entire buffer to be sent, letting the interrupt
* processing work in the background, this function may get
* locked up in this loop if the interrupts are not working
* correctly.
*/
while (TransmitComplete == FALSE) {
if (0 != TotalErrorCount) {
return XST_FAILURE;
}
}
/*
* Wait until bus is idle to start another transfer.
*/
while (XIicPs_BusIsBusy(&IicInstance));
/*
* Wait for a bit of time to allow the programming to complete
*/
usleep(200000);
return XST_SUCCESS;
}
/*****************************************************************************/
/**
* This function reads data from the IIC serial EEPROM into a specified buffer.
*
* @param BufferPtr contains the address of the data buffer to be filled.
* @param ByteCount contains the number of bytes in the buffer to be read.
*
* @return XST_SUCCESS if successful else XST_FAILURE.
*
* @note None.
*
******************************************************************************/
int EepromReadData(u8 *BufferPtr, u16 ByteCount)
{
int Status;
AddressType Address = EEPROM_START_ADDRESS;
/*
* Position the Pointer in EEPROM.
*/
if (sizeof(Address) == 1) {
WriteBuffer[0] = (u8) (Address);
}
else {
WriteBuffer[0] = (u8) (Address >> 8);
WriteBuffer[1] = (u8) (Address);
}
Status = EepromWriteData(sizeof(Address));
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
ReceiveComplete = FALSE;
/*
* Receive the Data.
*/
XIicPs_MasterRecv(&IicInstance, BufferPtr,
ByteCount, IIC_SLAVE_ADDR);
while (ReceiveComplete == FALSE) {
if (0 != TotalErrorCount) {
return XST_FAILURE;
}
}
/*
* Wait until bus is idle to start another transfer.
*/
while (XIicPs_BusIsBusy(&IicInstance));
return XST_SUCCESS;
}
/******************************************************************************/
/**
*
* This function setups the interrupt system such that interrupts can occur
* for the IIC.
*
* @param IicPsPtr contains a pointer to the instance of the Iic
* which is going to be connected to the interrupt controller.
*
* @return XST_SUCCESS if successful, otherwise XST_FAILURE.
*
* @note None.
*
*******************************************************************************/
static int SetupInterruptSystem(XIicPs *IicPsPtr)
{
int Status;
XScuGic_Config *IntcConfig; /* Instance of the interrupt controller */
Xil_ExceptionInit();
/*
* Initialize the interrupt controller driver so that it is ready to
* use.
*/
IntcConfig = XScuGic_LookupConfig(INTC_DEVICE_ID);
if (NULL == IntcConfig) {
return XST_FAILURE;
}
Status = XScuGic_CfgInitialize(&InterruptController, IntcConfig,
IntcConfig->CpuBaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Connect the interrupt controller interrupt handler to the hardware
* interrupt handling logic in the processor.
*/
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_IRQ_INT,
(Xil_ExceptionHandler)XScuGic_InterruptHandler,
&InterruptController);
/*
* Connect the device driver handler that will be called when an
* interrupt for the device occurs, the handler defined above performs
* the specific interrupt processing for the device.
*/
Status = XScuGic_Connect(&InterruptController, IIC_INTR_ID,
(Xil_InterruptHandler)XIicPs_MasterInterruptHandler,
(void *)IicPsPtr);
if (Status != XST_SUCCESS) {
return Status;
}
/*
* Enable the interrupt for the Iic device.
*/
XScuGic_Enable(&InterruptController, IIC_INTR_ID);
/*
* Enable interrupts in the Processor.
*/
Xil_ExceptionEnable();
return XST_SUCCESS;
}
/*****************************************************************************/
/**
*
* This function is the handler which performs processing to handle data events
* from the IIC. It is called from an interrupt context such that the amount
* of processing performed should be minimized.
*
* This handler provides an example of how to handle data for the IIC and
* is application specific.
*
* @param CallBackRef contains a callback reference from the driver, in
* this case it is the instance pointer for the IIC driver.
* @param Event contains the specific kind of event that has occurred.
* @param EventData contains the number of bytes sent or received for sent
* and receive events.
*
* @return None.
*
* @note None.
*
*******************************************************************************/
void Handler(void *CallBackRef, u32 Event)
{
/*
* All of the data transfer has been finished.
*/
if (0 != (Event & XIICPS_EVENT_COMPLETE_RECV)){
ReceiveComplete = TRUE;
} else if (0 != (Event & XIICPS_EVENT_COMPLETE_SEND)) {
TransmitComplete = TRUE;
} else if (0 == (Event & XIICPS_EVENT_SLAVE_RDY)){
/*
* If it is other interrupt but not slave ready interrupt, it is
* an error.
* Data was received with an error.
*/
TotalErrorCount++;
}
}