Posted on December 13, 2012 at 10:49I can write data on the LCD with 4bits mode (LCD_4bits from keil), I want to change the mode to 8bits. I need the pins assignements.
this is the configuration for 4bits_mode:
/* PINS:
- DB4 = PC3
- DB5 = PC2
- DB6 = PC1
- DB7 = PC0
- E = PC10
- RW = PC11
- RS = PC12 */
#define PIN_E ( 1 << 10)
#define PIN_RW ( 1 << 11)
#define PIN_RS ( 1 << 12)
#define PINS_CTRL (0x07 << 10)
#define PINS_DATA (0x0F << 0)
#define PINS_ALL (PINS_CTRL | PINS_DATA)
const unsigned int SWAP_DATA[16] = { 0x0, 0x8, 0x4, 0xC, 0x2, 0xA, 0x6, 0xE,
0x1, 0x9, 0x5, 0xD, 0x3, 0xB, 0x7, 0xF};
/* Enable Clock for peripheral driving LCD pins */
#define LCD_CLOCK_EN (RCC->APB2ENR |= (1 << 4)); // enable clock for GPIOC
/* pin E setting to 0 or 1 */
#define LCD_E(x) GPIOC->ODR = (GPIOC->ODR & ~PIN_E) | (x ? PIN_E : 0);
/* pin RW setting to 0 or 1 */
#define LCD_RW(x) GPIOC->ODR = (GPIOC->ODR & ~PIN_RW) | (x ? PIN_RW : 0);
/* pin RS setting to 0 or 1 */
#define LCD_RS(x) GPIOC->ODR = (GPIOC->ODR & ~PIN_RS) | (x ? PIN_RS : 0);
/* Reading DATA pins */
#define LCD_DATA_IN SWAP_DATA[(((GPIOC->IDR & PINS_DATA) >> 0) & 0x0F)]
/* Writing value to DATA pins */
#define LCD_DATA_OUT(x) GPIOC->ODR = (GPIOC->ODR & ~PINS_DATA) | ((SWAP_DATA[x]) << 0);
/* Setting all pins to output mode */
#define LCD_ALL_DIR_OUT GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00003333; \
GPIOC->CRH = (GPIOC->CRH & 0xFFF000FF) | 0x00033300;
/* Setting DATA pins to input mode */
#define LCD_DATA_DIR_IN GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00004444;
/* Setting DATA pins to output mode */
#define LCD_DATA_DIR_OUT GPIOC->CRL = (GPIOC->CRL & 0xFFFF0000) | 0x00003333;
