149 lines
4.4 KiB
C
149 lines
4.4 KiB
C
/**
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* @file pcd8544.c
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*
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* Roughly based on:
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* https://github.com/adafruit/Adafruit-PCD8544-Nokia-5110-LCD-library
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* https://github.com/olikraus/u8g2
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*/
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#include "disp_spi.h"
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#include "driver/gpio.h"
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#include <esp_log.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "pcd8544.h"
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#define TAG "lv_pcd8544"
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/**********************
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* MACROS
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**********************/
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#define BIT_SET(a,b) ((a) |= (1U<<(b)))
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#define BIT_CLEAR(a,b) ((a) &= ~(1U<<(b)))
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/**********************
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* STATIC FUNCTIONS
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**********************/
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static void pcd8544_send_cmd(uint8_t cmd)
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{
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disp_wait_for_pending_transactions();
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gpio_set_level(PCD8544_DC, 0); /*Command mode*/
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disp_spi_send_data(&cmd, 1);
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}
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static void pcd8544_send_data(void * data, uint16_t length)
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{
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disp_wait_for_pending_transactions();
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gpio_set_level(PCD8544_DC, 1); /*Data mode*/
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disp_spi_send_data(data, length);
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}
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static void pcd8544_send_colors(void * data, uint16_t length)
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{
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gpio_set_level(PCD8544_DC, 1); /*Data mode*/
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disp_spi_send_colors(data, length);
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}
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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void pcd8544_init(void){
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// TODO: orientation
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// Initialize non-SPI GPIOs
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gpio_pad_select_gpio(PCD8544_DC);
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gpio_set_direction(PCD8544_DC, GPIO_MODE_OUTPUT);
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gpio_pad_select_gpio(PCD8544_RST);
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gpio_set_direction(PCD8544_RST, GPIO_MODE_OUTPUT);
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// Reset the display
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gpio_set_level(PCD8544_RST, 0);
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vTaskDelay(100 / portTICK_RATE_MS);
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gpio_set_level(PCD8544_RST, 1);
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vTaskDelay(100 / portTICK_RATE_MS);
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pcd8544_send_cmd(0x21); /* activate chip (PD=0), horizontal increment (V=0), enter extended command set (H=1) */
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pcd8544_send_cmd(0x06); /* temp. control: b10 = 2 */
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pcd8544_send_cmd(0x13); /* bias system 1:48 */
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pcd8544_send_cmd(0xc0); /* medium Vop = Contrast 0x40 = 64 */
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pcd8544_send_cmd(0x20); /* activate chip (PD=0), horizontal increment (V=0), enter extended command set (H=0) */
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pcd8544_send_cmd(0x0c); /* display mode normal */
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}
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void pcd8544_set_contrast (uint8_t contrast){
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if (contrast > 0x7f){
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contrast = 0x7f;
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}
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pcd8544_send_cmd(0x21); /* activate chip (PD=0), horizontal increment (V=0), enter extended command set (H=1) */
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pcd8544_send_cmd(0x80 | contrast); /* medium Vop = Contrast */
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}
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void pcd8544_rounder(lv_disp_drv_t * disp_drv, lv_area_t *area){
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uint8_t hor_max = disp_drv->hor_res;
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uint8_t ver_max = disp_drv->ver_res;
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area->x1 = 0;
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area->y1 = 0;
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area->x2 = hor_max - 1;
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area->y2 = ver_max - 1;
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}
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void pcd8544_set_px_cb(lv_disp_drv_t * disp_drv, uint8_t * buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y,
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lv_color_t color, lv_opa_t opa){
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uint8_t set = (color.full == 0) && (LV_OPA_TRANSP != opa);
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uint16_t byte_index = x + (( y>>3 ) * buf_w);
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uint8_t bit_index = y & 0x7;
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if (set) {
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BIT_SET(buf[byte_index], bit_index);
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} else {
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BIT_CLEAR(buf[byte_index], bit_index);
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}
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}
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void pcd8544_flush(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_map){
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pcd8544_send_cmd(0x20); /* activate chip (PD=0), horizontal increment (V=0), enter extended command set (H=0) */
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uint8_t * buf = (uint8_t *) color_map;
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// Check if the whole frame buffer can be sent in a single SPI transaction
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if ((area->x1 == 0) && (area->y1 == 0) && (area->x2 == (disp_drv->hor_res - 1)) && (area->y2 == (disp_drv->ver_res - 1))){
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// send complete frame buffer at once.
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// NOTE: disp_spi_send_colors triggers lv_disp_flush_ready
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pcd8544_send_cmd(0x40); /* set Y address */
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pcd8544_send_cmd(0x80); /* set X address */
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pcd8544_send_colors(buf, disp_drv->hor_res * disp_drv->ver_res / 8);
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} else {
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// send horizontal tiles
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uint16_t bank_start = area->y1 / 8;
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uint16_t bank_end = area->y2 / 8;
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uint16_t bank;
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uint16_t cols_to_update = area->x2 - area->x1 + 1;
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for (bank = bank_start ; bank <= bank_end ; bank++ ){
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pcd8544_send_cmd(0x40 | bank ); /* set Y address */
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pcd8544_send_cmd(0x80 | area->x1 ); /* set X address */
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uint16_t offset = bank * disp_drv->hor_res + area->x1;
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pcd8544_send_data(&buf[offset], cols_to_update);
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}
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lv_disp_flush_ready(disp_drv);
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}
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}
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