-/*
- * SPDX-FileCopyrightText: 2010-2022 Espressif Systems (Shanghai) CO LTD
- *
- * SPDX-License-Identifier: CC0-1.0
- */
-
#include <stdio.h>
#include <inttypes.h>
-#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
-#include "freertos/task.h"
-#include "esp_chip_info.h"
-#include "esp_flash.h"
+#include "esp_log.h"
#include "esp_system.h"
+#include "driver/uart.h"
+
+#define PIN_UART_RXD 4
+#define PIN_UART_TXD 5
+
+#define ULCD_DEFAULT_BAUD_RATE 9600
+#define ULCD_DEFAULT_DATA_BITS UART_DATA_8_BITS
+#define ULCD_DEFAULT_PARITY UART_PARITY_DISABLE
+#define ULCD_DEFAULT_STOP_BITS UART_STOP_BITS_1
+#define TIME_LIMIT 2000
+
+
+static const char *TAG = "main";
+static const uart_port_t uart_port = UART_NUM_1;
+
+/* UART config. This is handy as some sort of default. */
+static const uart_config_t uart_cfg = {
+ .baud_rate = ULCD_DEFAULT_BAUD_RATE,
+ .data_bits = ULCD_DEFAULT_DATA_BITS,
+ .parity = ULCD_DEFAULT_PARITY,
+ .stop_bits = ULCD_DEFAULT_STOP_BITS,
+ .flow_ctrl = UART_HW_FLOWCTRL_CTS_RTS,
+ .rx_flow_ctrl_thresh = 10
+};
+
+
+/* Helper functions to make things easier for Arduino users */
+/* DO NOT CALL UNTIL UART IS INITIALIZED */
+int write_tx(const void *data, size_t bufsz);
+int read_rx(void *data, size_t bufsz, uint32_t timeout);
+int flush_rx();
+int flush_tx(uint32_t timeout);
+void update_baud(int baud);
+
+
+void ulcd_init(void);
+void ulcd_txt_demo(void);
+void ulcd_cls(void);
+
void app_main(void)
{
- printf("Hello world!\n");
-
- /* Print chip information */
- esp_chip_info_t chip_info;
- uint32_t flash_size;
- esp_chip_info(&chip_info);
- printf("This is %s chip with %d CPU core(s), %s%s%s%s, ",
- CONFIG_IDF_TARGET,
- chip_info.cores,
- (chip_info.features & CHIP_FEATURE_WIFI_BGN) ? "WiFi/" : "",
- (chip_info.features & CHIP_FEATURE_BT) ? "BT" : "",
- (chip_info.features & CHIP_FEATURE_BLE) ? "BLE" : "",
- (chip_info.features & CHIP_FEATURE_IEEE802154) ? ", 802.15.4 (Zigbee/Thread)" : "");
-
- unsigned major_rev = chip_info.revision / 100;
- unsigned minor_rev = chip_info.revision % 100;
- printf("silicon revision v%d.%d, ", major_rev, minor_rev);
- if(esp_flash_get_size(NULL, &flash_size) != ESP_OK) {
- printf("Get flash size failed");
- return;
- }
-
- printf("%" PRIu32 "MB %s flash\n", flash_size / (uint32_t)(1024 * 1024),
- (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");
-
- printf("Minimum free heap size: %" PRIu32 " bytes\n", esp_get_minimum_free_heap_size());
-
- for (int i = 10; i >= 0; i--) {
- printf("Restarting in %d seconds...\n", i);
- vTaskDelay(1000 / portTICK_PERIOD_MS);
- }
- printf("Restarting now.\n");
- fflush(stdout);
+ ESP_LOGI(TAG, "Starting program");
+ ESP_LOGI(TAG, "Initializing UART...");
+
+ /* Install Drivers */
+ const int uart_bufsz = UART_HW_FIFO_LEN(uart_port) + 4;
+ QueueHandle_t uart_q;
+ ESP_ERROR_CHECK(uart_driver_install(uart_port,
+ uart_bufsz,
+ uart_bufsz,
+ 10,
+ &uart_q,
+ 0));
+
+ /* Set comms parameters */
+ ESP_ERROR_CHECK(uart_param_config(uart_port, &uart_cfg));
+
+ /* Set pins */
+ ESP_ERROR_CHECK(uart_set_pin(uart_port, PIN_UART_TXD, PIN_UART_RXD,
+ UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));
+
+ /* UART is initialized. We can now work on initializing the uLCD. */
+ ESP_LOGI(TAG, "Wait 3 Seconds for ULCD to be Initialized");
+ vTaskDelay(pdMS_TO_TICKS(3000)); /* see "Power-Up and Reset" in 4D docs */
+
+
+ ESP_LOGI(TAG, "Initializing ULCD...");
+ /* This is not mentioned in the code. */
+ ulcd_init();
+
+ ulcd_cls();
+ ulcd_txt_demo();
+
+
+
+
+ ESP_LOGI(TAG, "Work is done");
+ vTaskDelay(pdMS_TO_TICKS(10000));
esp_restart();
}
+
+
+void ulcd_init(void) {
+ /* TODO port ported library without helpers */
+}
+
+
+void ulcd_cls(void) {
+ unsigned char instr[2];
+ unsigned char ack;
+ int written;
+
+ /* 1: move cursor to 0, 0 */
+ ESP_LOGI(TAG, "Clearing screen (gfx_Cls)");
+
+ /* opcode (big-endian) */
+ instr[0] = 0xFF;
+ instr[1] = 0xD7;
+
+ written = write_tx(instr, 2);
+ flush_tx(TIME_LIMIT);
+
+ if (written != 2) ESP_LOGE(TAG, "Failed to write gfx_Cls!");
+
+ written = read_rx(&ack, 1, TIME_LIMIT);
+ if (written != 1 || ack != 6)
+ ESP_LOGE(TAG, "Failed to get acknowledge");
+}
+
+
+void ulcd_txt_demo(void) {
+ unsigned char instr[100];
+ unsigned char ack;
+ int written; /* or read */
+
+ /* 1: move cursor to 0, 0 */
+ ESP_LOGI(TAG, "Moving cursor to 0, 0");
+
+ /* opcode (big-endian) */
+ instr[0] = 0xFF;
+ instr[1] = 0xE4;
+
+ /* Line value is 2 bytes */
+ instr[2] = 0;
+ instr[3] = 0;
+
+ /* Column is again 2 bytes */
+ instr[4] = 0;
+ instr[5] = 0;
+
+ /* Since this is a demo, we do not use helpers. */
+ /* START the below code can be made into a helper */
+ written = write_tx(instr, 6);
+ flush_tx(TIME_LIMIT);
+
+ if (written != 6) ESP_LOGE(TAG, "Failed to write txt_MoveCursor!");
+
+ written = read_rx(&ack, 1, TIME_LIMIT);
+ if (written != 1 || ack != 6)
+ ESP_LOGE(TAG, "Failed to get acknowledge");
+ /* END the below code can be made into a helper */
+
+ /* write Hello, World (12) to the display */
+ /* see putstr on Goldelox */
+
+ instr[0] = 0x00;
+ instr[1] = 0x06;
+
+ instr[2] = 'H';
+ instr[3] = 'e';
+ instr[4] = 'l';
+ instr[5] = 'l';
+ instr[6] = 'o';
+ instr[7] = ',';
+ instr[8] = ' ';
+ instr[9] = 'W';
+ instr[10] = 'o';
+ instr[11] = 'r';
+ instr[12] = 'l';
+ instr[13] = 'd';
+
+ instr[14] = '\0';
+
+ written = write_tx(instr, 15);
+ flush_tx(TIME_LIMIT);
+
+ if (written != 15) ESP_LOGE(TAG, "Failed to write putstr!");
+
+ written = read_rx(&ack, 1, TIME_LIMIT);
+ if (written != 1 || ack != 6)
+ ESP_LOGE(TAG, "Failed to get acknowledge");
+}
+
+
+/* ================================================================= */
+
+int write_tx(const void *data, size_t sz) {
+ return uart_write_bytes(uart_port, data, sz);
+}
+
+
+int read_rx(void *data, size_t sz, uint32_t wait_ms) {
+ if (sizeof(size_t) > sizeof(uint32_t) && sz > UINT32_MAX)
+ return -1;
+ return uart_read_bytes(uart_port, data, (uint32_t) sz,
+ (TickType_t) wait_ms / portTICK_PERIOD_MS);
+}
+
+
+int flush_rx() {
+ return (int) uart_flush(uart_port);
+}
+
+
+int flush_tx(uint32_t wait_ms) {
+ return (int) uart_wait_tx_done(uart_port,
+ (TickType_t) wait_ms / portTICK_PERIOD_MS);
+}
+
+void update_baud(int baud) {
+ uart_config_t ucfg2 = uart_cfg;
+ ucfg2.baud_rate = baud;
+ ESP_ERROR_CHECK(uart_param_config(uart_port, &ucfg2));
+}
+
+/* ================================================================= */
projects / 4dulcd-nolibrary.git / commitdiff