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micropython/stmhal/lcd.c

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#include <stdio.h>
#include <string.h>
#include <stm32f4xx_hal.h>
#include "nlr.h"
#include "misc.h"
#include "mpconfig.h"
#if MICROPY_HW_HAS_LCD
#include "qstr.h"
#include "parse.h"
#include "obj.h"
#include "runtime.h"
#include "systick.h"
#include "font_petme128_8x8.h"
#include "lcd.h"
#if defined(PYBV3)
#define PYB_LCD_PORT (GPIOA)
#define PYB_LCD_CS1_PIN (GPIO_PIN_0)
#define PYB_LCD_RST_PIN (GPIO_PIN_1)
#define PYB_LCD_A0_PIN (GPIO_PIN_2)
#define PYB_LCD_SCL_PIN (GPIO_PIN_3)
#define PYB_LCD_SI_PIN (GPIO_PIN_4)
#elif defined(PYBV4) || defined(PYBV10)
// X position
#define PYB_LCD_PORT (GPIOA)
#define PYB_LCD_CS1_PIN (GPIO_PIN_2) // X3
#define PYB_LCD_RST_PIN (GPIO_PIN_3) // X4
#define PYB_LCD_A0_PIN (GPIO_PIN_4) // X5
#define PYB_LCD_SCL_PIN (GPIO_PIN_5) // X6
#define PYB_LCD_SI_PIN (GPIO_PIN_7) // X8
#define PYB_LCD_BL_PORT (GPIOC)
#define PYB_LCD_BL_PIN (GPIO_PIN_5) // X12
/*
// Y position
#define PYB_LCD_PORT (GPIOB)
#define PYB_LCD_CS1_PIN (GPIO_PIN_8) // Y3 = PB8
#define PYB_LCD_RST_PIN (GPIO_PIN_9) // Y4 = PB9
#define PYB_LCD_A0_PIN (GPIO_PIN_12) // Y5 = PB12
#define PYB_LCD_SCL_PIN (GPIO_PIN_13) // Y6 = PB13
#define PYB_LCD_SI_PIN (GPIO_PIN_15) // Y8 = PB15
#define PYB_LCD_BL_PORT (GPIOB)
#define PYB_LCD_BL_PIN (GPIO_PIN_1) // Y12 = PB1
*/
#elif defined(STM32F4DISC)
/* Configure if needed */
#define PYB_LCD_PORT (GPIOA)
#define PYB_LCD_CS1_PIN (GPIO_PIN_2) // X3
#define PYB_LCD_RST_PIN (GPIO_PIN_3) // X4
#define PYB_LCD_A0_PIN (GPIO_PIN_4) // X5
#define PYB_LCD_SCL_PIN (GPIO_PIN_5) // X6
#define PYB_LCD_SI_PIN (GPIO_PIN_7) // X8
#define PYB_LCD_BL_PORT (GPIOC)
#define PYB_LCD_BL_PIN (GPIO_PIN_5) // X12
#endif
#define LCD_INSTR (0)
#define LCD_DATA (1)
static void lcd_delay(void) {
__asm volatile ("nop\nnop");
}
static void lcd_out(int instr_data, uint8_t i) {
lcd_delay();
PYB_LCD_PORT->BSRRH = PYB_LCD_CS1_PIN; // CS=0; enable
if (instr_data == LCD_INSTR) {
PYB_LCD_PORT->BSRRH = PYB_LCD_A0_PIN; // A0=0; select instr reg
} else {
PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN; // A0=1; select data reg
}
// send byte bigendian, latches on rising clock
for (uint32_t n = 0; n < 8; n++) {
lcd_delay();
PYB_LCD_PORT->BSRRH = PYB_LCD_SCL_PIN; // SCL=0
if ((i & 0x80) == 0) {
PYB_LCD_PORT->BSRRH = PYB_LCD_SI_PIN; // SI=0
} else {
PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN; // SI=1
}
i <<= 1;
lcd_delay();
PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN; // SCL=1
}
PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN; // CS=1; disable
/*
in Python, native types:
CS1_PIN(const) = 0
n = int(0)
delay_ms(0)
PORT[word:BSRRH] = 1 << CS1_PIN
for n in range(0, 8):
delay_ms(0)
PORT[word:BSRRH] = 1 << SCL_PIN
if i & 0x80 == 0:
PORT[word:BSRRH] = 1 << SI_PIN
else:
PORT[word:BSRRL] = 1 << SI_PIN
i <<= 1
delay_ms(0)
PORT[word:BSRRL] = 1 << SCL_PIN
*/
}
/*
static void lcd_data_out(uint8_t i) {
delay_ms(0);
PYB_LCD_PORT->BSRRH = PYB_LCD_CS1_PIN; // CS=0; enable
PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN; // A0=1; select data reg
// send byte bigendian, latches on rising clock
for (uint32_t n = 0; n < 8; n++) {
delay_ms(0);
PYB_LCD_PORT->BSRRH = PYB_LCD_SCL_PIN; // SCL=0
if ((i & 0x80) == 0) {
PYB_LCD_PORT->BSRRH = PYB_LCD_SI_PIN; // SI=0
} else {
PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN; // SI=1
}
i <<= 1;
delay_ms(0);
PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN; // SCL=1
}
PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN; // CS=1; disable
}
*/
// writes 8 vertical pixels
// pos 0 is upper left, pos 1 is 8 pixels to right of that, pos 128 is 8 pixels below that
mp_obj_t lcd_draw_pixel_8(mp_obj_t mp_pos, mp_obj_t mp_val) {
int pos = mp_obj_get_int(mp_pos);
int val = mp_obj_get_int(mp_val);
int page = pos / 128;
int offset = pos - (page * 128);
lcd_out(LCD_INSTR, 0xb0 | page); // page address set
lcd_out(LCD_INSTR, 0x10 | ((offset >> 4) & 0x0f)); // column address set upper
lcd_out(LCD_INSTR, 0x00 | (offset & 0x0f)); // column address set lower
lcd_out(LCD_DATA, val); // write data
return mp_const_none;
}
#define LCD_BUF_W (16)
#define LCD_BUF_H (4)
char lcd_char_buffer[LCD_BUF_W * LCD_BUF_H];
int lcd_line;
int lcd_column;
int lcd_next_line;
#define LCD_PIX_BUF_SIZE (128 * 32 / 8)
byte lcd_pix_buf[LCD_PIX_BUF_SIZE];
byte lcd_pix_buf2[LCD_PIX_BUF_SIZE];
mp_obj_t lcd_pix_clear(void) {
memset(lcd_pix_buf, 0, LCD_PIX_BUF_SIZE);
memset(lcd_pix_buf2, 0, LCD_PIX_BUF_SIZE);
return mp_const_none;
}
mp_obj_t lcd_pix_get(mp_obj_t mp_x, mp_obj_t mp_y) {
int x = mp_obj_get_int(mp_x);
int y = mp_obj_get_int(mp_y);
if (0 <= x && x <= 127 && 0 <= y && y <= 31) {
uint byte_pos = x + 128 * ((uint)y >> 3);
if (lcd_pix_buf[byte_pos] & (1 << (y & 7))) {
return mp_obj_new_int(1);
}
}
return mp_obj_new_int(0);
}
mp_obj_t lcd_pix_set(mp_obj_t mp_x, mp_obj_t mp_y) {
int x = mp_obj_get_int(mp_x);
int y = mp_obj_get_int(mp_y);
if (0 <= x && x <= 127 && 0 <= y && y <= 31) {
uint byte_pos = x + 128 * ((uint)y >> 3);
lcd_pix_buf2[byte_pos] |= 1 << (y & 7);
}
return mp_const_none;
}
mp_obj_t lcd_pix_reset(mp_obj_t mp_x, mp_obj_t mp_y) {
int x = mp_obj_get_int(mp_x);
int y = mp_obj_get_int(mp_y);
if (0 <= x && x <= 127 && 0 <= y && y <= 31) {
uint byte_pos = x + 128 * ((uint)y >> 3);
lcd_pix_buf2[byte_pos] &= ~(1 << (y & 7));
}
return mp_const_none;
}
mp_obj_t lcd_pix_show(void) {
memcpy(lcd_pix_buf, lcd_pix_buf2, LCD_PIX_BUF_SIZE);
for (uint page = 0; page < 4; page++) {
lcd_out(LCD_INSTR, 0xb0 | page); // page address set
lcd_out(LCD_INSTR, 0x10); // column address set upper; 0
lcd_out(LCD_INSTR, 0x00); // column address set lower; 0
for (uint i = 0; i < 128; i++) {
lcd_out(LCD_DATA, lcd_pix_buf[i + 128 * page]);
}
}
return mp_const_none;
}
mp_obj_t lcd_print(mp_obj_t text) {
uint len;
const char *data = mp_obj_str_get_data(text, &len);
lcd_print_strn(data, len);
return mp_const_none;
}
mp_obj_t lcd_light(mp_obj_t value) {
#if defined(PYB_LCD_BL_PORT)
if (mp_obj_is_true(value)) {
PYB_LCD_BL_PORT->BSRRL = PYB_LCD_BL_PIN; // set pin high to turn backlight on
} else {
PYB_LCD_BL_PORT->BSRRH = PYB_LCD_BL_PIN; // set pin low to turn backlight off
}
#endif
return mp_const_none;
}
static mp_obj_t mp_lcd = MP_OBJ_NULL;
static mp_obj_t pyb_lcd_init(void) {
if (mp_lcd != MP_OBJ_NULL) {
// already init'd
return mp_lcd;
}
// set the outputs high
PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_RST_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN;
// make them push/pull outputs
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
GPIO_InitStructure.Pull = GPIO_NOPULL;
GPIO_InitStructure.Pin = PYB_LCD_CS1_PIN | PYB_LCD_RST_PIN | PYB_LCD_A0_PIN | PYB_LCD_SCL_PIN | PYB_LCD_SI_PIN;
HAL_GPIO_Init(PYB_LCD_PORT, &GPIO_InitStructure);
#if defined(PYB_LCD_BL_PORT)
// backlight drive pin, starts low (off)
PYB_LCD_BL_PORT->BSRRH = PYB_LCD_BL_PIN;
GPIO_InitStructure.Pin = PYB_LCD_BL_PIN;
GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
GPIO_InitStructure.Pull = GPIO_NOPULL;
HAL_GPIO_Init(PYB_LCD_BL_PORT, &GPIO_InitStructure);
#endif
// init the LCD
HAL_Delay(1); // wait a bit
PYB_LCD_PORT->BSRRH = PYB_LCD_RST_PIN; // RST=0; reset
HAL_Delay(1); // wait for reset; 2us min
PYB_LCD_PORT->BSRRL = PYB_LCD_RST_PIN; // RST=1; enable
HAL_Delay(1); // wait for reset; 2us min
lcd_out(LCD_INSTR, 0xa0); // ADC select, normal
lcd_out(LCD_INSTR, 0xc8); // common output mode select, reverse
lcd_out(LCD_INSTR, 0xa2); // LCD bias set, 1/9 bias
lcd_out(LCD_INSTR, 0x2f); // power control set, 0b111=(booster on, vreg on, vfollow on)
lcd_out(LCD_INSTR, 0x21); // v0 voltage regulator internal resistor ratio set, 0b001=small
lcd_out(LCD_INSTR, 0x81); // electronic volume mode set
lcd_out(LCD_INSTR, 0x34); // electronic volume register set, 0b110100
lcd_out(LCD_INSTR, 0x40); // display start line set, 0
lcd_out(LCD_INSTR, 0xaf); // LCD display, on
// clear display
for (int page = 0; page < 4; page++) {
lcd_out(LCD_INSTR, 0xb0 | page); // page address set
lcd_out(LCD_INSTR, 0x10); // column address set upper
lcd_out(LCD_INSTR, 0x00); // column address set lower
for (int i = 0; i < 128; i++) {
lcd_out(LCD_DATA, 0x00);
}
}
for (int i = 0; i < LCD_BUF_H * LCD_BUF_W; i++) {
lcd_char_buffer[i] = ' ';
}
lcd_line = 0;
lcd_column = 0;
lcd_next_line = 0;
// Micro Python interface
mp_obj_t o = mp_obj_new_type(MP_QSTR_LCD, mp_const_empty_tuple, mp_obj_new_dict(0));
mp_store_attr(o, qstr_from_str("lcd8"), mp_make_function_n(2, lcd_draw_pixel_8));
mp_store_attr(o, qstr_from_str("clear"), mp_make_function_n(0, lcd_pix_clear));
mp_store_attr(o, qstr_from_str("get"), mp_make_function_n(2, lcd_pix_get));
mp_store_attr(o, qstr_from_str("set"), mp_make_function_n(2, lcd_pix_set));
mp_store_attr(o, qstr_from_str("reset"), mp_make_function_n(2, lcd_pix_reset));
mp_store_attr(o, qstr_from_str("show"), mp_make_function_n(0, lcd_pix_show));
mp_store_attr(o, qstr_from_str("text"), mp_make_function_n(1, lcd_print));
mp_store_attr(o, qstr_from_str("light"), mp_make_function_n(1, lcd_light));
mp_lcd = o;
return o;
}
static MP_DEFINE_CONST_FUN_OBJ_0(pyb_lcd_init_obj, pyb_lcd_init);
void lcd_init(void) {
mp_lcd = MP_OBJ_NULL;
mp_store_name(qstr_from_str("LCD"), (mp_obj_t)&pyb_lcd_init_obj);
}
void lcd_print_str(const char *str) {
lcd_print_strn(str, strlen(str));
}
void lcd_print_strn(const char *str, unsigned int len) {
int redraw_min = lcd_line * LCD_BUF_W + lcd_column;
int redraw_max = redraw_min;
int did_new_line = 0;
for (; len > 0; len--, str++) {
// move to next line if needed
if (lcd_next_line) {
if (lcd_line + 1 < LCD_BUF_H) {
lcd_line += 1;
} else {
lcd_line = LCD_BUF_H - 1;
for (int i = 0; i < LCD_BUF_W * (LCD_BUF_H - 1); i++) {
lcd_char_buffer[i] = lcd_char_buffer[i + LCD_BUF_W];
}
for (int i = 0; i < LCD_BUF_W; i++) {
lcd_char_buffer[LCD_BUF_W * (LCD_BUF_H - 1) + i] = ' ';
}
redraw_min = 0;
redraw_max = LCD_BUF_W * LCD_BUF_H;
}
lcd_next_line = 0;
lcd_column = 0;
did_new_line = 1;
}
if (*str == '\n') {
lcd_next_line = 1;
} else if (*str == '\r') {
lcd_column = 0;
} else if (*str == '\b') {
if (lcd_column > 0) {
lcd_column--;
}
} else if (lcd_column >= LCD_BUF_W) {
lcd_next_line = 1;
str -= 1;
len += 1;
} else {
lcd_char_buffer[lcd_line * LCD_BUF_W + lcd_column] = *str;
lcd_column += 1;
int max = lcd_line * LCD_BUF_W + lcd_column;
if (max > redraw_max) {
redraw_max = max;
}
}
}
int last_page = -1;
for (int i = redraw_min; i < redraw_max; i++) {
int page = i / LCD_BUF_W;
if (page != last_page) {
int offset = 8 * (i - (page * LCD_BUF_W));
lcd_out(LCD_INSTR, 0xb0 | page); // page address set
lcd_out(LCD_INSTR, 0x10 | ((offset >> 4) & 0x0f)); // column address set upper
lcd_out(LCD_INSTR, 0x00 | (offset & 0x0f)); // column address set lower
last_page = page;
}
int chr = lcd_char_buffer[i];
if (chr < 32 || chr > 126) {
chr = 127;
}
const uint8_t *chr_data = &font_petme128_8x8[(chr - 32) * 8];
for (int j = 0; j < 8; j++) {
lcd_out(LCD_DATA, chr_data[j]);
}
}
if (did_new_line) {
HAL_Delay(50);
}
}
#endif // MICROPY_HW_HAS_LCD
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