It seems to be everything correct with the code. The wiring is fine, I'm sure.
Can anyone see what is wrong?
The sequence of commands were taken from the PCD8544 datasheet.
Microcontroller = TM4C123GH6PM.
IDE = CCS v6
Compiler = TI ARM Compiler 5.1.8
Peripheral Library = TivaWare 2.1
/*
* main.c
*/
#include <stdint.h>
#include <stdbool.h>
#include <inc/hw_memmap.h>
#include <inc/hw_types.h>
#include <driverlib/gpio.h>
#include <driverlib/sysctl.h>
#include <driverlib/pin_map.h>
#include <driverlib/ssi.h>
//#define LCD_PIN_CLK GPIO_PIN_2 //used by the SSI module
#define LCD_PIN_RST GPIO_PIN_3
#define LCD_PIN_DnC GPIO_PIN_4
//#define LCD_PIN_DIN GPIO_PIN_5 //used by the SSI module
#define LCD_PIN_BL GPIO_PIN_6
#define LCD_PIN_SCE GPIO_PIN_7
#define LCD_PIN_HIGH 0xff
#define LCD_PIN_LOW 0x00
void LCDWriteCmd(uint8_t u8Cmd)
{
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_DnC, LCD_PIN_LOW);
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_SCE, LCD_PIN_LOW);
SSIDataPut(SSI0_BASE, ((uint32_t) u8Cmd));
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_SCE, LCD_PIN_HIGH);
}
void LCDWriteDat(uint8_t u8Data)
{
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_DnC, LCD_PIN_HIGH);
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_SCE, LCD_PIN_LOW);
SSIDataPut(SSI0_BASE, ((uint32_t) u8Data));
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_SCE, LCD_PIN_HIGH);
}
int main(void)
{
//Clock configuration
SysCtlClockSet(SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_SYSDIV_4 | SYSCTL_XTAL_16MHZ);
//Enable GPIOA and SSI eripheral
SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);
//Configure GPIO pins (RST, DnC, BL, SCE) as output
GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_6 | GPIO_PIN_7);
//Enable pin PA2 for SSI0 SSI0CLK
GPIOPinConfigure(GPIO_PA2_SSI0CLK);
GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_2);
//Enable pin PA5 for SSI0 SSI0TX
GPIOPinConfigure(GPIO_PA5_SSI0TX);
GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5);
//COnfigures SSI module
SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0 , SSI_MODE_MASTER, 1000000, 8);
SSIEnable(SSI0_BASE);
//Applies reset signal
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_RST, LCD_PIN_HIGH);
SysCtlDelay(100000);
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_RST, LCD_PIN_LOW);
SysCtlDelay(100000);
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_RST, LCD_PIN_HIGH);
//SCE line goes low
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_SCE, LCD_PIN_LOW);
//Selects command mode
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_DnC, LCD_PIN_LOW);
//Selects extended instruction set
SSIDataPut(SSI0_BASE, ((uint32_t) 0x21));
//Set Vop
SSIDataPut(SSI0_BASE, ((uint32_t) 0x90));
//Selects normal instruction set
SSIDataPut(SSI0_BASE, ((uint32_t) 0x20));
//Puts display on normal mode
SSIDataPut(SSI0_BASE, ((uint32_t) 0x0c));
//Selectes data mode
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_DnC, LCD_PIN_HIGH);
//Write some data (uppercase letters P and H)
SSIDataPut(SSI0_BASE, ((uint32_t) 0x1f));
SSIDataPut(SSI0_BASE, ((uint32_t) 0x05));
SSIDataPut(SSI0_BASE, ((uint32_t) 0x07));
SSIDataPut(SSI0_BASE, ((uint32_t) 0x00));
SSIDataPut(SSI0_BASE, ((uint32_t) 0x1f));
SSIDataPut(SSI0_BASE, ((uint32_t) 0x04));
SSIDataPut(SSI0_BASE, ((uint32_t) 0x1f));
//Selects command mode
GPIOPinWrite(GPIO_PORTA_BASE, LCD_PIN_DnC, LCD_PIN_LOW);
//Sets inverse video mode
SSIDataPut(SSI0_BASE, ((uint32_t) 0x0d));
//Set X address to 0000000
SSIDataPut(SSI0_BASE, ((uint32_t) 0x80));
//Data write
SSIDataPut(SSI0_BASE, ((uint32_t) 0x00));
while(1)
{
}
}
