Part Number: MSP430G2253
I am trying to do a simple light up the entire display after the intialization, but my code doesn't seem to work. any suggestions on debugging the issue? (have no logic analyzer or oscilloscope yet)
/*************************************************************
// MSP430 I2C OLED Module
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#include <msp430.h>
// SSD1306 PARAMETERS
#define SSD1306_LCDWIDTH 128
#define SSD1306_LCDHEIGHT 64
#define SSD1306_MAXROWS 7
#define SSD1306_MAXCONTRAST 0xFF
// command table
#define SSD1306_SETCONTRAST 0x81
#define SSD1306_DISPLAYALLON_RESUME 0xA4
#define SSD1306_DISPLAYALLON 0xA5
#define SSD1306_NORMALDISPLAY 0xA6
#define SSD1306_INVERTDISPLAY 0xA7
#define SSD1306_DISPLAYOFF 0xAE
#define SSD1306_DISPLAYON 0xAF
// scrolling commands
#define SSD1306_SCROLL_RIGHT 0x26
#define SSD1306_SCROLL_LEFT 0X27
#define SSD1306_SCROLL_VERT_RIGHT 0x29
#define SSD1306_SCROLL_VERT_LEFT 0x2A
#define SSD1306_SET_VERTICAL 0xA3
// address setting
#define SSD1306_SETLOWCOLUMN 0x00
#define SSD1306_SETHIGHCOLUMN 0x10
#define SSD1306_MEMORYMODE 0x20
#define SSD1306_COLUMNADDRESS 0x21
#define SSD1306_COLUMNADDRESS_MSB 0x00
#define SSD1306_COLUMNADDRESS_LSB 0x7F
#define SSD1306_PAGEADDRESS 0x22
#define SSD1306_PAGE_START_ADDRESS 0xB0
// hardware configuration
#define SSD1306_SETSTARTLINE 0x40
#define SSD1306_SEGREMAP 0xA1
#define SSD1306_SETMULTIPLEX 0xA8
#define SSD1306_COMSCANINC 0xC0
#define SSD1306_COMSCANDEC 0xC8
#define SSD1306_SETDISPLAYOFFSET 0xD3
#define SSD1306_SETCOMPINS 0xDA
// timing and driving
#define SSD1306_SETDISPLAYCLOCKDIV 0xD5
#define SSD1306_SETPRECHARGE 0xD9
#define SSD1306_SETVCOMDETECT 0xDB
#define SSD1306_NOP 0xE3
// power supply configuration
#define SSD1306_CHARGEPUMP 0x8D
#define SSD1306_EXTERNALVCC 0x10
#define SSD1306_SWITCHCAPVCC 0x20
#define SSD1306_ADDRESS 0x3C
/*unsigned char init_array_SSD1306 [] = {
0xAE, // Set display OFF
0xD5, // Set Display Clock Divide Ratio / OSC Frequency
0x80, // Display Clock Divide Ratio / OSC Frequency
0xA8, // Set Multiplex Ratio
0x3F, // Multiplex Ratio for 128x64 (64-1)
0xD3, // Set Display Offset
0x00, // Display Offset
0x40, // Set Display Start Line
0x8D, // Set Charge Pump
0x14, // Charge Pump (0x10 External, 0x14 Internal DC/DC)
0x20, // SET MEMORY ADDRESSING MODE
0x02, // horizontal addressing mode
0xA1, // set segment re-map, column address 127 is mapped to SEG0
0xC8, // Set Com Output Scan Direction
0xDA, // Set COM Hardware Configuration
0x12, // COM Hardware Configuration
0x81, // Set Contrast
0xCF, // Contrast
0xD9, // Set Pre-Charge Period
0xF1, // Set Pre-Charge Period (0x22 External, 0xF1 Internal)
0xDB, // Set VCOMH Deselect Level
0x40, // VCOMH Deselect Level
0xA4, // Set all pixels OFF
0xA6, // Set display not inverted
0xAF, // Set display On
0xA5, // all pixels on
};*/
char SSD1306_init[] = {
SSD1306_DISPLAYOFF,
SSD1306_SETLOWCOLUMN,
SSD1306_SETHIGHCOLUMN,
SSD1306_SETSTARTLINE,
SSD1306_SETCONTRAST,
0xcf,
SSD1306_SEGREMAP,
SSD1306_NORMALDISPLAY,
SSD1306_SETMULTIPLEX,
0x3f,
SSD1306_SETDISPLAYOFFSET,
0x00,
SSD1306_SETDISPLAYCLOCKDIV,
0x80,
SSD1306_SETPRECHARGE,
0xf1,
SSD1306_SETCOMPINS,
0x12,
SSD1306_SETVCOMDETECT,
0x40,
SSD1306_CHARGEPUMP,
0x14,
SSD1306_DISPLAYON
};
const unsigned int length = sizeof(init_array_SSD1306)/sizeof(init_array_SSD1306[0]);
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
/* Configure P1.6 and P1.7 for I2C */
P1SEL |= BIT6 + BIT7;
P1SEL2 |= BIT6 + BIT7;
UCB0CTL1 |= UCSWRST; // Enable SW reset
UCB0CTL0 = UCMST+UCMODE_3+UCSYNC; // I2C Master, synchronous mode
UCB0CTL1 = UCSSEL_2+UCSWRST; // Use SMCLK, keep SW reset
UCB0BR0 = 12; // fSCL = SMCLK/12 = ~100kHz
UCB0BR1 = 0;
UCB0I2CSA = SSD1306_ADDRESS;
UCB0CTL1 &= ~UCSWRST; // Clear SW reset, resume operation
UCB0CTL1 |= UCTR + UCTXSTT; // I2C TX, start condition
unsigned char BYTE_CNT = 0;
__disable_interrupt();
while(BYTE_CNT < length)
{
while (!(IFG2 & UCB0TXIFG));
UCB0TXBUF = init_array_SSD1306[BYTE_CNT++];
}
while (UCB0STAT & UCBUSY); // wait for all to finish
UCB0RXBUF; // clear IFG and overruns
while(1);
}
btw, the two initialized arrays are different. the one commented out was my original that I based on looking around google for other people's code. the one uncommented was from the msp430 booster code example.
