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//******************************************************************************
// MSP430F552x Demo - USCI_B0, I2C Master multiple byte TX/RX
//
// Description: I2C master communicates to I2C slave sending and receiving
// 3 different messages of different length. I2C master will enter LPM0 mode
// while waiting for the messages to be sent/receiving using I2C interrupt.
// ACLK = NA, MCLK = SMCLK = DCO 16MHz.
//
// /|\ /|\
// MSP430F5529 4.7k |
// ----------------- | 4.7k
// /|\ | P3.1|---+---|-- I2C Clock (UCB0SCL)
// | | | |
// ---|RST P3.0|-------+-- I2C Data (UCB0SDA)
// | |
// | |
// | |
// | |
// | |
// | |
//
// Nima Eskandari
// Texas Instruments Inc.
// April 2017
// Built with CCS V7.0
//******************************************************************************
#include <msp430.h>
#include <stdint.h>
#include <stdbool.h>
#include "oledfont.h"
//******************************************************************************
// Example Commands ************************************************************
//******************************************************************************
#define X_WIDTH 128
#define Y_WIDTH 64
#define OLED_CMD 0 //寫命令
#define OLED_DATA 1 //寫數據
#define SLAVE_ADDR 0x3C
/* CMD_TYPE_X_SLAVE are example commands the master sends to the slave.
* The slave will send example SlaveTypeX buffers in response.
*
* CMD_TYPE_X_MASTER are example commands the master sends to the slave.
* The slave will initialize itself to receive MasterTypeX example buffers.
* */
#define CMD_TYPE_0_SLAVE 0
#define CMD_TYPE_1_SLAVE 1
#define CMD_TYPE_2_SLAVE 2
#define CMD_TYPE_0_MASTER 3
#define CMD_TYPE_1_MASTER 4
#define CMD_TYPE_2_MASTER 5
#define TYPE_0_LENGTH 1
#define TYPE_1_LENGTH 2
#define TYPE_2_LENGTH 6
#define MAX_BUFFER_SIZE 20
/* MasterTypeX are example buffers initialized in the master, they will be
* sent by the master to the slave.
* SlaveTypeX are example buffers initialized in the slave, they will be
* sent by the slave to the master.
* */
uint8_t MasterType2 [TYPE_2_LENGTH] = {'F', '4', '1', '9', '2', 'B'};
uint8_t MasterType1 [28] = {0xae,0x00,0x10,0x40,0x81,0xcf,0xa1,0xc8,0xa6,0xa8,0x3f,0xd3,0x00,0xd5,0x80,0xd9,0xf1,0xda,0x12,0xdb,0x40,0x20,0x02,0x8d,0x14,0xa4,0xa6,0xaf};
uint8_t MasterType0 [1] = {0};
uint8_t SlaveType2 [TYPE_2_LENGTH] = {0};
uint8_t SlaveType1 [TYPE_1_LENGTH] = {0};
uint8_t SlaveType0 [TYPE_0_LENGTH] = {0};
void delay(unsigned int z)
{
unsigned int x,y;
for(x=z;x>0;x--)
for(y=5000;y>0;y--);
}
//******************************************************************************
// General I2C State Machine ***************************************************
//******************************************************************************
typedef enum I2C_ModeEnum{
IDLE_MODE,
NACK_MODE,
TX_REG_ADDRESS_MODE,
RX_REG_ADDRESS_MODE,
TX_DATA_MODE,
RX_DATA_MODE,
SWITCH_TO_RX_MODE,
SWITHC_TO_TX_MODE,
TIMEOUT_MODE
} I2C_Mode;
/* Used to track the state of the software state machine*/
I2C_Mode MasterMode = IDLE_MODE;
/* The Register Address/Command to use*/
uint8_t TransmitRegAddr = 0;
/* ReceiveBuffer: Buffer used to receive data in the ISR
* RXByteCtr: Number of bytes left to receive
* ReceiveIndex: The index of the next byte to be received in ReceiveBuffer
* TransmitBuffer: Buffer used to transmit data in the ISR
* TXByteCtr: Number of bytes left to transfer
* TransmitIndex: The index of the next byte to be transmitted in TransmitBuffer
* */
uint8_t ReceiveBuffer[MAX_BUFFER_SIZE] = {0};
uint8_t RXByteCtr = 0;
uint8_t ReceiveIndex = 0;
uint8_t TransmitBuffer[MAX_BUFFER_SIZE] = {0};
uint8_t TXByteCtr = 0;
uint8_t TransmitIndex = 0;
/* I2C Write and Read Functions */
/* For slave device with dev_addr, writes the data specified in *reg_data
*
* dev_addr: The slave device address.
* Example: SLAVE_ADDR
* reg_addr: The register or command to send to the slave.
* Example: CMD_TYPE_0_MASTER
* *reg_data: The buffer to write
* Example: MasterType0
* count: The length of *reg_data
* Example: TYPE_0_LENGTH
* */
I2C_Mode I2C_Master_WriteReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t count);
/* For slave device with dev_addr, read the data specified in slaves reg_addr.
* The received data is available in ReceiveBuffer
*
* dev_addr: The slave device address.
* Example: SLAVE_ADDR
* reg_addr: The register or command to send to the slave.
* Example: CMD_TYPE_0_SLAVE
* count: The length of data to read
* Example: TYPE_0_LENGTH
* */
I2C_Mode I2C_Master_ReadReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t count);
void CopyArray(uint8_t *source, uint8_t *dest, uint8_t count);
I2C_Mode I2C_Master_ReadReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t count)
{
/* Initialize state machine */
MasterMode = TX_REG_ADDRESS_MODE;
TransmitRegAddr = reg_addr;
RXByteCtr = count;
TXByteCtr = 0;
ReceiveIndex = 0;
TransmitIndex = 0;
/* Initialize slave address and interrupts */
UCB0I2CSA = dev_addr;
UCB0IFG &= ~(UCTXIFG + UCRXIFG); // Clear any pending interrupts
UCB0IE &= ~UCRXIE; // Disable RX interrupt
UCB0IE |= UCTXIE; // Enable TX interrupt
UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts
return MasterMode;
}
I2C_Mode I2C_Master_WriteReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t *reg_data, uint8_t count)
{
/* Initialize state machine */
MasterMode = TX_REG_ADDRESS_MODE;
TransmitRegAddr = reg_addr;
//Copy register data to TransmitBuffer
CopyArray(reg_data, TransmitBuffer, count);
TXByteCtr = count;
RXByteCtr = 0;
ReceiveIndex = 0;
TransmitIndex = 0;
/* Initialize slave address and interrupts */
UCB0I2CSA = dev_addr;
UCB0IFG &= ~(UCTXIFG + UCRXIFG); // Clear any pending interrupts
UCB0IE &= ~UCRXIE; // Disable RX interrupt
UCB0IE |= UCTXIE; // Enable TX interrupt
UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts
return MasterMode;
}
void CopyArray(uint8_t *source, uint8_t *dest, uint8_t count)
{
uint8_t copyIndex = 0;
for (copyIndex = 0; copyIndex < count; copyIndex++)
{
dest[copyIndex] = source[copyIndex];
}
}
//******************************************************************************
// Device Initialization *******************************************************
//******************************************************************************
void initClockTo16MHz()
{
UCSCTL3 |= SELREF_2; // Set DCO FLL reference = REFO
UCSCTL4 |= SELA_2; // Set ACLK = REFO
__bis_SR_register(SCG0); // Disable the FLL control loop
UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx
UCSCTL1 = DCORSEL_5; // Select DCO range 16MHz operation
UCSCTL2 = FLLD_0 + 487; // Set DCO Multiplier for 16MHz
// (N + 1) * FLLRef = Fdco
// (487 + 1) * 32768 = 16MHz
// Set FLL Div = fDCOCLK
__bic_SR_register(SCG0); // Enable the FLL control loop
// Worst-case settling time for the DCO when the DCO range bits have been
// changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx
// UG for optimization.
// 32 x 32 x 16 MHz / 32,768 Hz = 500000 = MCLK cycles for DCO to settle
__delay_cycles(500000);//
// Loop until XT1,XT2 & DCO fault flag is cleared
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG); // Clear XT2,XT1,DCO fault flags
SFRIFG1 &= ~OFIFG; // Clear fault flags
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
}
void initGPIO()
{
//I2C Pins
P3SEL |= BIT0 + BIT1; // P3.0,1 option select
}
void initI2C()
{
UCB0CTL1 |= UCSWRST; // Enable SW reset(復位使能)
UCB0CTL0 = UCMST + UCMODE_3 + UCSYNC; // Master, I2C,synchronous mode(同步模式)
UCB0CTL1 = UCSSEL_2 + UCSWRST; // Use SMCLK, keep SW reset
UCB0BR0 = 160; // fSCL = SMCLK/160 = ~100kHz
UCB0BR1 = 0;
UCB0I2CSA = SLAVE_ADDR; // Slave Address is 048h
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
UCB0IE |= UCNACKIE; //使能中斷
}
void OLED_WrCmd(unsigned char IIC_Command)
{
MasterType0[0]=IIC_Command;
I2C_Master_WriteReg(SLAVE_ADDR, 0x00,MasterType0, 1);
}
void OLED_WrDat(unsigned char IIC_Data)
{
MasterType0[0]=IIC_Data;
I2C_Master_WriteReg(SLAVE_ADDR, 0x40,MasterType0, 1);
}
//******************************************************************************
// Main ************************************************************************
// Send and receive three messages containing the example commands *************
//******************************************************************************
void OLED_Fill(unsigned char bmp_dat)
{
unsigned char y,x;
for(y=0;y<8;y++)
{
OLED_WrCmd(0xb0+y);
OLED_WrCmd(0x01);
OLED_WrCmd(0x10);
for(x=0;x<128;x++)
OLED_WrDat(bmp_dat);
}
}
void OLED_Set_Pos(unsigned char x, unsigned char y)
{
OLED_WrCmd(0xb0+y);
OLED_WrCmd(((x&0xf0)>>4)|0x10);
OLED_WrCmd((x&0x0f)|0x01);
}
void OLED_Init(void)
{
unsigned char i=0;
for(;i<28;i++)
{
MasterType0[0]=MasterType1[i];
I2C_Master_WriteReg(SLAVE_ADDR, 0x00,MasterType0, 1);
}
OLED_Fill(0x00); //初始清屏
OLED_Set_Pos(0,0);
}
void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
if(cmd)
{
OLED_WrDat(dat);
}
else {
OLED_WrCmd(dat);
}
}
void OLED_ShowChar(unsigned char x,unsigned char y,unsigned char chr,unsigned char Char_Size)
{
unsigned char c=0,i=0;
c=chr-' ';//得到偏移后的值
if(x>128-1){x=0;y=y+2;}
if(Char_Size ==16)
{
OLED_Set_Pos(x,y);
for(i=0;i<8;i++)
OLED_WR_Byte(F8X16[c*16+i],OLED_DATA);
OLED_Set_Pos(x,y+1);
for(i=0;i<8;i++)
OLED_WR_Byte(F8X16[c*16+i+8],OLED_DATA);
}
else {
OLED_Set_Pos(x,y);
for(i=0;i<6;i++)
OLED_WR_Byte(F6x8[c][i],OLED_DATA);
}
}
void OLED_U32toU16(unsigned char x,unsigned char y ,unsigned int n,unsigned char k)
{
switch(n)
{
case 0 :OLED_ShowChar(x,y,'0',k);break;
case 1 :OLED_ShowChar(x,y,'1',k);break;
case 2 :OLED_ShowChar(x,y,'2',k);break;
case 3 :OLED_ShowChar(x,y,'3',k);break;
case 4 :OLED_ShowChar(x,y,'4',k);break;
case 5 :OLED_ShowChar(x,y,'5',k);break;
case 6 :OLED_ShowChar(x,y,'6',k);break;
case 7 :OLED_ShowChar(x,y,'7',k);break;
case 8 :OLED_ShowChar(x,y,'8',k);break;
case 9 :OLED_ShowChar(x,y,'9',k);break;
}
}
void OLED_Show_Number(unsigned char x,unsigned char y ,unsigned int a,unsigned char n)
{
unsigned int b,c,d,e,f,g;
b=a/100000;
c=a%100000/10000;
d=a%10000/1000;
e=a%1000/100;
f=a%100/10;
g=a%10;
if(b!=0)
{
OLED_U32toU16(x,y,b,n);
OLED_U32toU16(x+n/2,y,c,n);
OLED_U32toU16(x+n,y,d,n);
OLED_U32toU16(x+(n/2)*3,y,e,n);
OLED_U32toU16(x+2*n,y,f,n);
OLED_U32toU16(x+(n/2)*5,y,g,n);
}else if(b==0&&c!=0)
{
OLED_U32toU16(x,y,c,n);
OLED_U32toU16(x+n/2,y,d,n);
OLED_U32toU16(x+n,y,e,n);
OLED_U32toU16(x+(n/2)*3,y,f,n);
OLED_U32toU16(x+2*n,y,g,n);
}else if(b==0&&c==0&&d!=0)
{
OLED_U32toU16(x,y,d,n);
OLED_U32toU16(x+n/2,y,e,n);
OLED_U32toU16(x+n,y,f,n);
OLED_U32toU16(x+(n/2)*3,y,g,n);
}else if(b==0&&c==0&&d==0&&e!=0)
{
OLED_U32toU16(x,y,e,n);
OLED_U32toU16(x+n/2,y,f,n);
OLED_U32toU16(x+n,y,g,n);
}else if(b==0&&c==0&&d==0&&e==0&&f!=0)
{
OLED_U32toU16(x,y,f,n);
OLED_U32toU16(x+n/2,y,g,n);
}else
{
OLED_U32toU16(x,y,g,n);
}
}
int main(void) {
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
initClockTo16MHz(); //配置系統時鐘為16Mhz
initGPIO();
initI2C();
delay(500);
OLED_Init();
OLED_Show_Number(0,0,500,16);
__bis_SR_register(LPM0_bits + GIE);
}
//******************************************************************************
// I2C Interrupt ***************************************************************
//******************************************************************************
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_B0_VECTOR
__interrupt void USCI_B0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_B0_VECTOR))) USCI_B0_ISR (void)
#else
#error Compiler not supported!
#endif
{
//Must read from UCB0RXBUF
uint8_t rx_val = 0;
switch(__even_in_range(UCB0IV,0xC))
{
case USCI_NONE:break; // Vector 0 - no interrupt
case USCI_I2C_UCALIFG:break; // Interrupt Vector: I2C Mode: UCALIFG
case USCI_I2C_UCNACKIFG:break; // Interrupt Vector: I2C Mode: UCNACKIFG
case USCI_I2C_UCSTTIFG:break; // Interrupt Vector: I2C Mode: UCSTTIFG
case USCI_I2C_UCSTPIFG:break; // Interrupt Vector: I2C Mode: UCSTPIFG
case USCI_I2C_UCRXIFG:
rx_val = UCB0RXBUF;
if (RXByteCtr)
{
ReceiveBuffer[ReceiveIndex++] = rx_val;
RXByteCtr--;
}
if (RXByteCtr == 1)
{
UCB0CTL1 |= UCTXSTP;
}
else if (RXByteCtr == 0)
{
UCB0IE &= ~UCRXIE;
MasterMode = IDLE_MODE;
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0
}
break; // Interrupt Vector: I2C Mode: UCRXIFG
case USCI_I2C_UCTXIFG:
switch (MasterMode)
{
case TX_REG_ADDRESS_MODE:
UCB0TXBUF = TransmitRegAddr;
if (RXByteCtr)
MasterMode = SWITCH_TO_RX_MODE; // Need to start receiving now
else
MasterMode = TX_DATA_MODE; // Continue to transmission with the data in Transmit Buffer
break;
case SWITCH_TO_RX_MODE:
UCB0IE |= UCRXIE; // Enable RX interrupt
UCB0IE &= ~UCTXIE; // Disable TX interrupt
UCB0CTL1 &= ~UCTR; // Switch to receiver
MasterMode = RX_DATA_MODE; // State state is to receive data
UCB0CTL1 |= UCTXSTT; // Send repeated start
if (RXByteCtr == 1)
{
//Must send stop since this is the N-1 byte
while((UCB0CTL1 & UCTXSTT));
UCB0CTL1 |= UCTXSTP; // Send stop condition
}
break;
case TX_DATA_MODE:
if (TXByteCtr)
{
UCB0TXBUF = TransmitBuffer[TransmitIndex++];
TXByteCtr--;
}
else
{
//Done with transmission
UCB0CTL1 |= UCTXSTP; // Send stop condition
MasterMode = IDLE_MODE;
UCB0IE &= ~UCTXIE; // disable TX interrupt
__bic_SR_register_on_exit(CPUOFF); // Exit LPM0
}
break;
default:
__no_operation();
break;
}
break; // Interrupt Vector: I2C Mode: UCTXIFG
default: break;
}
}

復制代碼

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