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290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
2 years ago
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/**
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* @file ST7565.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "ST7565.h"
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#if USE_ST7565
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#include <stdbool.h>
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#include <stddef.h>
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#include <string.h>
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#include "lvgl/lv_core/lv_vdb.h"
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#include LV_DRV_DISP_INCLUDE
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#include LV_DRV_DELAY_INCLUDE
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/*********************
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* DEFINES
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*********************/
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#define ST7565_BAUD 2000000 /*< 2,5 MHz (400 ns)*/
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#define ST7565_CMD_MODE 0
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#define ST7565_DATA_MODE 1
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#define ST7565_HOR_RES 128
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#define ST7565_VER_RES 64
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#define CMD_DISPLAY_OFF 0xAE
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#define CMD_DISPLAY_ON 0xAF
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#define CMD_SET_DISP_START_LINE 0x40
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#define CMD_SET_PAGE 0xB0
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#define CMD_SET_COLUMN_UPPER 0x10
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#define CMD_SET_COLUMN_LOWER 0x00
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#define CMD_SET_ADC_NORMAL 0xA0
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#define CMD_SET_ADC_REVERSE 0xA1
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#define CMD_SET_DISP_NORMAL 0xA6
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#define CMD_SET_DISP_REVERSE 0xA7
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#define CMD_SET_ALLPTS_NORMAL 0xA4
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#define CMD_SET_ALLPTS_ON 0xA5
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#define CMD_SET_BIAS_9 0xA2
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#define CMD_SET_BIAS_7 0xA3
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#define CMD_RMW 0xE0
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#define CMD_RMW_CLEAR 0xEE
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#define CMD_INTERNAL_RESET 0xE2
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#define CMD_SET_COM_NORMAL 0xC0
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#define CMD_SET_COM_REVERSE 0xC8
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#define CMD_SET_POWER_CONTROL 0x28
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#define CMD_SET_RESISTOR_RATIO 0x20
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#define CMD_SET_VOLUME_FIRST 0x81
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#define CMD_SET_VOLUME_SECOND 0x00
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#define CMD_SET_STATIC_OFF 0xAC
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#define CMD_SET_STATIC_ON 0xAD
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#define CMD_SET_STATIC_REG 0x00
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#define CMD_SET_BOOSTER_FIRST 0xF8
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#define CMD_SET_BOOSTER_234 0x00
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#define CMD_SET_BOOSTER_5 0x01
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#define CMD_SET_BOOSTER_6 0x03
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#define CMD_NOP 0xE3
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#define CMD_TEST 0xF0
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static void st7565_sync(int32_t x1, int32_t y1, int32_t x2, int32_t y2);
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static void st7565_command(uint8_t cmd);
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static void st7565_data(uint8_t data);
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/**********************
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* STATIC VARIABLES
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**********************/
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static uint8_t lcd_fb[ST7565_HOR_RES * ST7565_VER_RES / 8] = {0xAA, 0xAA};
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static uint8_t pagemap[] = { 7, 6, 5, 4, 3, 2, 1, 0 };
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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/**
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* Initialize the ST7565
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*/
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void st7565_init(void)
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{
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LV_DRV_DISP_RST(1);
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LV_DRV_DELAY_MS(10);
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LV_DRV_DISP_RST(0);
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LV_DRV_DELAY_MS(10);
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LV_DRV_DISP_RST(1);
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LV_DRV_DELAY_MS(10);
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LV_DRV_DISP_SPI_CS(0);
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st7565_command(CMD_SET_BIAS_7);
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st7565_command(CMD_SET_ADC_NORMAL);
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st7565_command(CMD_SET_COM_NORMAL);
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st7565_command(CMD_SET_DISP_START_LINE);
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st7565_command(CMD_SET_POWER_CONTROL | 0x4);
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LV_DRV_DELAY_MS(50);
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st7565_command(CMD_SET_POWER_CONTROL | 0x6);
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LV_DRV_DELAY_MS(50);
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st7565_command(CMD_SET_POWER_CONTROL | 0x7);
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LV_DRV_DELAY_MS(10);
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st7565_command(CMD_SET_RESISTOR_RATIO | 0x6); // Defaulted to 0x26 (but could also be between 0x20-0x27 based on display's specs)
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st7565_command(CMD_DISPLAY_ON);
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st7565_command(CMD_SET_ALLPTS_NORMAL);
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/*Set brightness*/
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st7565_command(CMD_SET_VOLUME_FIRST);
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st7565_command(CMD_SET_VOLUME_SECOND | (0x18 & 0x3f));
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LV_DRV_DISP_SPI_CS(1);
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memset(lcd_fb, 0x00, sizeof(lcd_fb));
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}
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void st7565_flush(int32_t x1, int32_t y1, int32_t x2, int32_t y2, const lv_color_t * color_p)
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{
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/*Return if the area is out the screen*/
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if(x2 < 0) return;
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if(y2 < 0) return;
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if(x1 > ST7565_HOR_RES - 1) return;
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if(y1 > ST7565_VER_RES - 1) return;
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/*Truncate the area to the screen*/
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int32_t act_x1 = x1 < 0 ? 0 : x1;
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int32_t act_y1 = y1 < 0 ? 0 : y1;
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int32_t act_x2 = x2 > ST7565_HOR_RES - 1 ? ST7565_HOR_RES - 1 : x2;
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int32_t act_y2 = y2 > ST7565_VER_RES - 1 ? ST7565_VER_RES - 1 : y2;
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int32_t x, y;
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/*Set the first row in */
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/*Refresh frame buffer*/
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for(y = act_y1; y <= act_y2; y++) {
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for(x = act_x1; x <= act_x2; x++) {
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if(lv_color_to1(*color_p) != 0) {
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lcd_fb[x + (y / 8)*ST7565_HOR_RES] &= ~(1 << (7 - (y % 8)));
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} else {
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lcd_fb[x + (y / 8)*ST7565_HOR_RES] |= (1 << (7 - (y % 8)));
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}
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color_p ++;
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}
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color_p += x2 - act_x2; /*Next row*/
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}
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st7565_sync(act_x1, act_y1, act_x2, act_y2);
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lv_flush_ready();
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}
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void st7565_fill(int32_t x1, int32_t y1, int32_t x2, int32_t y2, lv_color_t color)
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{
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/*Return if the area is out the screen*/
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if(x2 < 0) return;
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if(y2 < 0) return;
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if(x1 > ST7565_HOR_RES - 1) return;
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if(y1 > ST7565_VER_RES - 1) return;
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/*Truncate the area to the screen*/
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int32_t act_x1 = x1 < 0 ? 0 : x1;
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int32_t act_y1 = y1 < 0 ? 0 : y1;
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int32_t act_x2 = x2 > ST7565_HOR_RES - 1 ? ST7565_HOR_RES - 1 : x2;
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int32_t act_y2 = y2 > ST7565_VER_RES - 1 ? ST7565_VER_RES - 1 : y2;
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int32_t x, y;
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uint8_t white = lv_color_to1(color);
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/*Refresh frame buffer*/
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for(y = act_y1; y <= act_y2; y++) {
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for(x = act_x1; x <= act_x2; x++) {
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if(white != 0) {
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lcd_fb[x + (y / 8)*ST7565_HOR_RES] |= (1 << (7 - (y % 8)));
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} else {
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lcd_fb[x + (y / 8)*ST7565_HOR_RES] &= ~(1 << (7 - (y % 8)));
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}
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}
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}
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st7565_sync(act_x1, act_y1, act_x2, act_y2);
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}
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void st7565_map(int32_t x1, int32_t y1, int32_t x2, int32_t y2, const lv_color_t * color_p)
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{
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/*Return if the area is out the screen*/
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if(x2 < 0) return;
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if(y2 < 0) return;
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if(x1 > ST7565_HOR_RES - 1) return;
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if(y1 > ST7565_VER_RES - 1) return;
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/*Truncate the area to the screen*/
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int32_t act_x1 = x1 < 0 ? 0 : x1;
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int32_t act_y1 = y1 < 0 ? 0 : y1;
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int32_t act_x2 = x2 > ST7565_HOR_RES - 1 ? ST7565_HOR_RES - 1 : x2;
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int32_t act_y2 = y2 > ST7565_VER_RES - 1 ? ST7565_VER_RES - 1 : y2;
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int32_t x, y;
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/*Set the first row in */
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/*Refresh frame buffer*/
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for(y = act_y1; y <= act_y2; y++) {
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for(x = act_x1; x <= act_x2; x++) {
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if(lv_color_to1(*color_p) != 0) {
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lcd_fb[x + (y / 8)*ST7565_HOR_RES] &= ~(1 << (7 - (y % 8)));
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} else {
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lcd_fb[x + (y / 8)*ST7565_HOR_RES] |= (1 << (7 - (y % 8)));
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}
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color_p ++;
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}
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color_p += x2 - act_x2; /*Next row*/
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}
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st7565_sync(act_x1, act_y1, act_x2, act_y2);
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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/**
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* Flush a specific part of the buffer to the display
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* @param x1 left coordinate of the area to flush
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* @param y1 top coordinate of the area to flush
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* @param x2 right coordinate of the area to flush
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* @param y2 bottom coordinate of the area to flush
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*/
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static void st7565_sync(int32_t x1, int32_t y1, int32_t x2, int32_t y2)
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{
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LV_DRV_DISP_SPI_CS(0);
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uint8_t c, p;
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for(p = y1 / 8; p <= y2 / 8; p++) {
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st7565_command(CMD_SET_PAGE | pagemap[p]);
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st7565_command(CMD_SET_COLUMN_LOWER | (x1 & 0xf));
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st7565_command(CMD_SET_COLUMN_UPPER | ((x1 >> 4) & 0xf));
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st7565_command(CMD_RMW);
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for(c = x1; c <= x2; c++) {
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st7565_data(lcd_fb[(ST7565_HOR_RES * p) + c]);
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}
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}
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LV_DRV_DISP_SPI_CS(1);
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}
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/**
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* Write a command to the ST7565
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* @param cmd the command
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*/
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static void st7565_command(uint8_t cmd)
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{
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LV_DRV_DISP_CMD_DATA(ST7565_CMD_MODE);
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LV_DRV_DISP_SPI_WR_BYTE(cmd);
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}
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/**
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* Write data to the ST7565
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* @param data the data
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*/
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static void st7565_data(uint8_t data)
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{
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LV_DRV_DISP_CMD_DATA(ST7565_DATA_MODE);
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LV_DRV_DISP_SPI_WR_BYTE(data);
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}
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#endif
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