210 lines
6.7 KiB
C
210 lines
6.7 KiB
C
#include <string.h>
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#include <stm32f4xx_gpio.h>
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#include "misc.h"
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#include "systick.h"
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#include "lcd.h"
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#include "font_petme128_8x8.h"
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#define PYB_LCD_PORT (GPIOA)
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#define PYB_LCD_CS1_PIN (GPIO_Pin_0)
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#define PYB_LCD_RST_PIN (GPIO_Pin_1)
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#define PYB_LCD_A0_PIN (GPIO_Pin_2)
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#define PYB_LCD_SCL_PIN (GPIO_Pin_3)
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#define PYB_LCD_SI_PIN (GPIO_Pin_4)
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#define LCD_INSTR (0)
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#define LCD_DATA (1)
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static void lcd_out(int instr_data, uint8_t i) {
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sys_tick_delay_ms(0);
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PYB_LCD_PORT->BSRRH = PYB_LCD_CS1_PIN; // CS=0; enable
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if (instr_data == LCD_INSTR) {
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PYB_LCD_PORT->BSRRH = PYB_LCD_A0_PIN; // A0=0; select instr reg
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} else {
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PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN; // A0=1; select data reg
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}
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// send byte bigendian, latches on rising clock
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for (uint32_t n = 0; n < 8; n++) {
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sys_tick_delay_ms(0);
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PYB_LCD_PORT->BSRRH = PYB_LCD_SCL_PIN; // SCL=0
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if ((i & 0x80) == 0) {
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PYB_LCD_PORT->BSRRH = PYB_LCD_SI_PIN; // SI=0
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} else {
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PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN; // SI=1
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}
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i <<= 1;
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sys_tick_delay_ms(0);
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PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN; // SCL=1
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}
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PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN; // CS=1; disable
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/*
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in Python, native types:
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CS1_PIN(const) = 0
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n = int(0)
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delay_ms(0)
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PORT[word:BSRRH] = 1 << CS1_PIN
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for n in range(0, 8):
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delay_ms(0)
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PORT[word:BSRRH] = 1 << SCL_PIN
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if i & 0x80 == 0:
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PORT[word:BSRRH] = 1 << SI_PIN
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else:
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PORT[word:BSRRL] = 1 << SI_PIN
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i <<= 1
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delay_ms(0)
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PORT[word:BSRRL] = 1 << SCL_PIN
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*/
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}
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/*
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static void lcd_data_out(uint8_t i) {
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delay_ms(0);
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PYB_LCD_PORT->BSRRH = PYB_LCD_CS1_PIN; // CS=0; enable
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PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN; // A0=1; select data reg
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// send byte bigendian, latches on rising clock
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for (uint32_t n = 0; n < 8; n++) {
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delay_ms(0);
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PYB_LCD_PORT->BSRRH = PYB_LCD_SCL_PIN; // SCL=0
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if ((i & 0x80) == 0) {
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PYB_LCD_PORT->BSRRH = PYB_LCD_SI_PIN; // SI=0
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} else {
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PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN; // SI=1
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}
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i <<= 1;
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delay_ms(0);
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PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN; // SCL=1
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}
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PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN; // CS=1; disable
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}
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*/
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#define LCD_BUF_W (16)
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#define LCD_BUF_H (4)
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char lcd_buffer[LCD_BUF_W * LCD_BUF_H];
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int lcd_line;
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int lcd_column;
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int lcd_next_line;
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void lcd_init(void) {
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// set the outputs high
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PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN;
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PYB_LCD_PORT->BSRRL = PYB_LCD_RST_PIN;
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PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN;
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PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN;
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PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN;
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// make them push/pull outputs
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = PYB_LCD_CS1_PIN | PYB_LCD_RST_PIN | PYB_LCD_A0_PIN | PYB_LCD_SCL_PIN | PYB_LCD_SI_PIN;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
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GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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GPIO_Init(PYB_LCD_PORT, &GPIO_InitStructure);
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// init the LCD
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sys_tick_delay_ms(1); // wait a bit
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PYB_LCD_PORT->BSRRH = PYB_LCD_RST_PIN; // RST=0; reset
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sys_tick_delay_ms(1); // wait for reset; 2us min
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PYB_LCD_PORT->BSRRL = PYB_LCD_RST_PIN; // RST=1; enable
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sys_tick_delay_ms(1); // wait for reset; 2us min
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lcd_out(LCD_INSTR, 0xa0); // ADC select, normal
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lcd_out(LCD_INSTR, 0xc8); // common output mode select, reverse
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lcd_out(LCD_INSTR, 0xa2); // LCD bias set, 1/9 bias
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lcd_out(LCD_INSTR, 0x2f); // power control set, 0b111=(booster on, vreg on, vfollow on)
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lcd_out(LCD_INSTR, 0x21); // v0 voltage regulator internal resistor ratio set, 0b001=small
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lcd_out(LCD_INSTR, 0x81); // electronic volume mode set
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lcd_out(LCD_INSTR, 0x34); // electronic volume register set, 0b110100
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lcd_out(LCD_INSTR, 0x40); // display start line set, 0
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lcd_out(LCD_INSTR, 0xaf); // LCD display, on
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// clear display
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for (int page = 0; page < 4; page++) {
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lcd_out(LCD_INSTR, 0xb0 | page); // page address set
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lcd_out(LCD_INSTR, 0x10); // column address set upper
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lcd_out(LCD_INSTR, 0x00); // column address set lower
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for (int i = 0; i < 128; i++) {
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lcd_out(LCD_DATA, 0x00);
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}
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}
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for (int i = 0; i < LCD_BUF_H * LCD_BUF_W; i++) {
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lcd_buffer[i] = ' ';
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}
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lcd_line = 0;
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lcd_column = 0;
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lcd_next_line = 0;
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}
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void lcd_print_str(const char *str) {
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lcd_print_strn(str, strlen(str));
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}
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void lcd_print_strn(const char *str, unsigned int len) {
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int redraw_min = lcd_line * LCD_BUF_W + lcd_column;
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int redraw_max = redraw_min;
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int did_new_line = 0;
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for (; len > 0; len--, str++) {
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// move to next line if needed
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if (lcd_next_line) {
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if (lcd_line + 1 < LCD_BUF_H) {
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lcd_line += 1;
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} else {
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lcd_line = LCD_BUF_H - 1;
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for (int i = 0; i < LCD_BUF_W * (LCD_BUF_H - 1); i++) {
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lcd_buffer[i] = lcd_buffer[i + LCD_BUF_W];
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}
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for (int i = 0; i < LCD_BUF_W; i++) {
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lcd_buffer[LCD_BUF_W * (LCD_BUF_H - 1) + i] = ' ';
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}
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redraw_min = 0;
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redraw_max = LCD_BUF_W * LCD_BUF_H;
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}
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lcd_next_line = 0;
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lcd_column = 0;
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did_new_line = 1;
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}
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if (*str == '\n') {
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lcd_next_line = 1;
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} else if (lcd_column >= LCD_BUF_W) {
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lcd_next_line = 1;
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str -= 1;
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len += 1;
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} else {
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lcd_buffer[lcd_line * LCD_BUF_W + lcd_column] = *str;
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lcd_column += 1;
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int max = lcd_line * LCD_BUF_W + lcd_column;
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if (max > redraw_max) {
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redraw_max = max;
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}
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}
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}
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int last_page = -1;
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for (int i = redraw_min; i < redraw_max; i++) {
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int page = i / LCD_BUF_W;
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if (page != last_page) {
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int offset = 8 * (i - (page * LCD_BUF_W));
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lcd_out(LCD_INSTR, 0xb0 | page); // page address set
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lcd_out(LCD_INSTR, 0x10 | ((offset >> 4) & 0x0f)); // column address set upper
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lcd_out(LCD_INSTR, 0x00 | (offset & 0x0f)); // column address set lower
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last_page = page;
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}
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int chr = lcd_buffer[i];
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if (chr < 32 || chr > 126) {
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chr = 127;
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}
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const uint8_t *chr_data = &font_petme128_8x8[(chr - 32) * 8];
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for (int i = 0; i < 8; i++) {
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lcd_out(LCD_DATA, chr_data[i]);
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}
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}
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if (did_new_line) {
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sys_tick_delay_ms(200);
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}
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}
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