/**************************************************************************//**
* @file main.c
* @version V3.00
* $Revision: 3 $
* $Date: 15/05/20 3:58p $
* @brief
* Show how to wake up MCU from Power-down.
* This sample code needs to work with I2C_Wakeup_Slave.
* @note
* Copyright (C) 2014 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "NUC100Series.h"
#define PLLCON_SETTING CLK_PLLCON_50MHz_HXT
#define PLL_CLOCK 50000000
/*---------------------------------------------------------------------------------------------------------*/
/* Global variables */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t g_u8DeviceAddr;
volatile uint8_t g_au8MstTxData[3];
volatile uint8_t g_u8MstRxData;
volatile uint8_t g_u8MstDataLen;
volatile uint8_t g_u8MstEndFlag = 0;
typedef void (*I2C_FUNC)(uint32_t u32Status);
static volatile I2C_FUNC s_I2C0HandlerFn = NULL;
/*---------------------------------------------------------------------------------------------------------*/
/* I2C0 IRQ Handler */
/*---------------------------------------------------------------------------------------------------------*/
void I2C0_IRQHandler(void)
{
uint32_t u32Status;
u32Status = I2C_GET_STATUS(I2C0);
if(I2C_GET_TIMEOUT_FLAG(I2C0))
{
/* Clear I2C0 Timeout Flag */
I2C_ClearTimeoutFlag(I2C0);
}
else
{
if(s_I2C0HandlerFn != NULL)
s_I2C0HandlerFn(u32Status);
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* I2C Master Tx Wake Up Callback Function */
/*---------------------------------------------------------------------------------------------------------*/
void I2C_MasterTxWakeup(uint32_t u32Status)
{
if(u32Status == 0x08) /* START has been transmitted */
{
I2C_SET_DATA(I2C0, (g_u8DeviceAddr << 1)); /* Write SLA+W to Register I2CDAT */
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x18) /* SLA+W has been transmitted and ACK has been received */
{
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STO_SI);
g_u8MstEndFlag = 1;
}
else if(u32Status == 0x20) /* SLA+W has been transmitted and NOT ACK has been received */
{
I2C_STOP(I2C0);
g_u8MstEndFlag = 1;
}
else
{
/* TO DO */
printf("Status 0x%x is NOT processed\n", u32Status);
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* I2C Rx Callback Function */
/*---------------------------------------------------------------------------------------------------------*/
void I2C_MasterRx(uint32_t u32Status)
{
if(u32Status == 0x08) /* START has been transmitted and prepare SLA+W */
{
I2C_SET_DATA(I2C0, (g_u8DeviceAddr << 1)); /* Write SLA+W to Register I2CDAT */
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x18) /* SLA+W has been transmitted and ACK has been received */
{
I2C_SET_DATA(I2C0, g_au8MstTxData[g_u8MstDataLen++]);
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x20) /* SLA+W has been transmitted and NACK has been received */
{
I2C_STOP(I2C0);
I2C_START(I2C0);
}
else if(u32Status == 0x28) /* DATA has been transmitted and ACK has been received */
{
if(g_u8MstDataLen != 2)
{
I2C_SET_DATA(I2C0, g_au8MstTxData[g_u8MstDataLen++]);
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else
{
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA_SI);
}
}
else if(u32Status == 0x10) /* Repeat START has been transmitted and prepare SLA+R */
{
I2C_SET_DATA(I2C0, ((g_u8DeviceAddr << 1) | 0x01)); /* Write SLA+R to Register I2CDAT */
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x40) /* SLA+R has been transmitted and ACK has been received */
{
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x58) /* DATA has been received and NACK has been returned */
{
g_u8MstRxData = (unsigned char) I2C_GET_DATA(I2C0);
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STO_SI);
g_u8MstEndFlag = 1;
}
else
{
/* TO DO */
printf("Status 0x%x is NOT processed\n", u32Status);
}
}
/*---------------------------------------------------------------------------------------------------------*/
/* I2C Tx Callback Function */
/*---------------------------------------------------------------------------------------------------------*/
void I2C_MasterTx(uint32_t u32Status)
{
if(u32Status == 0x08) /* START has been transmitted */
{
I2C_SET_DATA(I2C0, g_u8DeviceAddr << 1); /* Write SLA+W to Register I2CDAT */
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x18) /* SLA+W has been transmitted and ACK has been received */
{
I2C_SET_DATA(I2C0, g_au8MstTxData[g_u8MstDataLen++]);
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else if(u32Status == 0x20) /* SLA+W has been transmitted and NACK has been received */
{
I2C_STOP(I2C0);
I2C_START(I2C0);
}
else if(u32Status == 0x28) /* DATA has been transmitted and ACK has been received */
{
if(g_u8MstDataLen != 3)
{
I2C_SET_DATA(I2C0, g_au8MstTxData[g_u8MstDataLen++]);
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_SI);
}
else
{
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STO_SI);
g_u8MstEndFlag = 1;
}
}
else
{
/* TO DO */
printf("Status 0x%x is NOT processed\n", u32Status);
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable Internal RC 22.1184MHz clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for Internal RC clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable external XTAL 12MHz clock */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
/* Waiting for external XTAL clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
/* Set core clock as PLL_CLOCK from PLL */
CLK_SetCoreClock(PLL_CLOCK);
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Enable I2C0 module clock */
CLK_EnableModuleClock(I2C0_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set GPB multi-function pins for UART0 RXD and TXD */
SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
SYS->GPB_MFP |= SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD;
/* Set GPA multi-function pins for I2C0 SDA and SCL */
SYS->GPA_MFP &= ~(SYS_GPA_MFP_PA8_Msk | SYS_GPA_MFP_PA9_Msk);
SYS->GPA_MFP |= SYS_GPA_MFP_PA8_I2C0_SDA | SYS_GPA_MFP_PA9_I2C0_SCL;
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, 115200);
}
void I2C0_Init(void)
{
/* Open I2C module and set bus clock */
I2C_Open(I2C0, 100000);
/* Get I2C0 Bus Clock */
printf("I2C clock %d Hz\n", I2C_GetBusClockFreq(I2C0));
/* Set I2C 4 Slave Addresses */
I2C_SetSlaveAddr(I2C0, 0, 0x15, 0); /* Slave Address : 0x15 */
I2C_SetSlaveAddr(I2C0, 1, 0x35, 0); /* Slave Address : 0x35 */
I2C_SetSlaveAddr(I2C0, 2, 0x55, 0); /* Slave Address : 0x55 */
I2C_SetSlaveAddr(I2C0, 3, 0x75, 0); /* Slave Address : 0x75 */
/* Enable I2C interrupt */
I2C_EnableInt(I2C0);
NVIC_EnableIRQ(I2C0_IRQn);
}
void I2C0_Close(void)
{
/* Disable I2C0 interrupt and clear corresponding NVIC bit */
I2C_DisableInt(I2C0);
NVIC_DisableIRQ(I2C0_IRQn);
/* Disable I2C0 and close I2C0 clock */
I2C_Close(I2C0);
CLK_DisableModuleClock(I2C0_MODULE);
}
int32_t I2C0_Read_Write_SLAVE(uint8_t slvaddr)
{
uint32_t i;
g_u8DeviceAddr = slvaddr;
for(i = 0; i < 0x100; i++)
{
g_au8MstTxData[0] = (uint8_t)((i & 0xFF00) >> 8);
g_au8MstTxData[1] = (uint8_t)(i & 0x00FF);
g_au8MstTxData[2] = (uint8_t)(g_au8MstTxData[1] + 3);
g_u8MstDataLen = 0;
g_u8MstEndFlag = 0;
/* I2C function to write data to slave */
s_I2C0HandlerFn = (I2C_FUNC)I2C_MasterTx;
/* I2C as master sends START signal */
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA);
/* Wait I2C Tx Finish */
while(g_u8MstEndFlag == 0);
g_u8MstEndFlag = 0;
/* I2C function to read data from slave */
s_I2C0HandlerFn = (I2C_FUNC)I2C_MasterRx;
g_u8MstDataLen = 0;
g_u8DeviceAddr = slvaddr;
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA);
/* Wait I2C Rx Finish */
while(g_u8MstEndFlag == 0);
/* Compare data */
if(g_u8MstRxData != g_au8MstTxData[2])
{
printf("I2C Byte Write/Read Failed, Data 0x%x\n", g_u8MstRxData);
return -1;
}
}
printf("Master Access Slave (0x%X) Test OK\n", slvaddr);
return 0;
}
/*---------------------------------------------------------------------------------------------------------*/
/* Main Function */
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Init UART0 for printf */
UART0_Init();
/* Lock protected registers */
SYS_LockReg();
/*
This sample code sets I2C bus clock to 100kHz. After wake-up, then accesses Slave with Byte
Write and Byte Read operations, and check if the read data is equal to the programmed data.
*/
printf("+------------------------------------------------------------------------+\n");
printf("| NUC100 I2C Driver Sample Code (Master) for wake-up & access Slave test |\n");
printf("| |\n");
printf("| I2C Master (I2C0) <---> I2C Slave(I2C0) |\n");
printf("+------------------------------------------------------------------------+\n");
printf("Configure I2C0 as a master.\n");
printf("The I/O connection for I2C0:\n");
printf("I2C0_SDA(P3.4), I2C0_SCL(P3.5)\n");
/* Init I2C0 to access Slave */
I2C0_Init();
printf("\n");
printf("Check I2C slave at power down status.\n");
printf("Press any key to Wake up slave.\n");
getchar();
/* Set the Slave address to wake-up*/
g_u8DeviceAddr = 0x15;
/* I2C function to wake-up slave*/
s_I2C0HandlerFn = (I2C_FUNC)I2C_MasterTxWakeup;
/* Send a START condition to bus */
I2C_SET_CONTROL_REG(I2C0, I2C_I2CON_STA);
while(g_u8MstEndFlag == 0);
/*Access to the corresponding address Slave*/
printf("\n");
printf(" == No Mask Address ==\n");
I2C0_Read_Write_SLAVE(0x15);
I2C0_Read_Write_SLAVE(0x35);
I2C0_Read_Write_SLAVE(0x55);
I2C0_Read_Write_SLAVE(0x75);
printf("SLAVE Address test OK.\n");
/* Access Slave with address mask */
printf("\n");
printf(" == Mask Address ==\n");
I2C0_Read_Write_SLAVE(0x15 & ~0x01);
I2C0_Read_Write_SLAVE(0x35 & ~0x04);
I2C0_Read_Write_SLAVE(0x55 & ~0x01);
I2C0_Read_Write_SLAVE(0x75 & ~0x04);
printf("SLAVE Address Mask test OK.\n");
s_I2C0HandlerFn = NULL;
/* Close I2C0 */
I2C0_Close();
while(1);
}
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