mhu/reflow-oven-control-sw
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Make LCD code working. Add FSM for LCD in order to write it in mainloop

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This commit is contained in:
Mario Hüttel 2020-05-02 19:10:20 +02:00
parent e237776810
commit df82f14206
2 changed files with 224 additions and 4 deletions
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10
stm-firmware/include/reflow-controller/ui/lcd.h
View File

@ -31,4 +31,14 @@
#define LCD_RS_MASK (1U << LCD_RS)
#define LCD_E_MASK (1U << LCD_E)
enum lcd_fsm_ret {LCD_FSM_NOP, LCD_FSM_CALL_AGAIN, LCD_FSM_WAIT_CALL};
void lcd_init(void);
void lcd_string(const char *data);
void lcd_home(void);
enum lcd_fsm_ret lcd_fsm_write_buffer(const char (*display_buffer)[21]);
#endif /* __LCD_H__ */

218
stm-firmware/ui/lcd.c
View File

@ -22,6 +22,9 @@
#include <reflow-controller/ui/lcd.h>
#include <reflow-controller/systick.h>
#include <stm-periph/clock-enable-manager.h>
#include <stm-periph/stm32-gpio-macros.h>
#include <stdbool.h>
#include <string.h>
static void lcd_port_clear(void)
{
@ -42,9 +45,9 @@ static void lcd_enable(void)
__ASM("nop");
__ASM("nop");
__ASM("nop");
__ASM("nop");
//systick_wait_ms(10);
LCD_DPORT->ODR &= ~LCD_E_MASK;
__ASM("nop");
//systick_wait_ms(10);
__ASM("nop");
__ASM("nop");
__ASM("nop");
@ -141,6 +144,8 @@ static void lcd_command(uint8_t data)
// Set DD RAM Address --------- 0b1xxxxxxx (Display Data RAM)
#define LCD_SET_DDADR 0x80
static char shadow_display[4][21];
void lcd_clear(void)
{
lcd_command(LCD_CLEAR_DISPLAY);
@ -153,7 +158,7 @@ void lcd_home(void)
systick_wait_ms(3);
}
void lcd_setcursor(uint8_t x, uint8_t y)
static uint8_t lcd_get_set_cursor_cmd(uint8_t x, uint8_t y)
{
uint8_t data;
@ -179,9 +184,19 @@ void lcd_setcursor(uint8_t x, uint8_t y)
break;
default:
return; // für den Fall einer falschen Zeile
/* In case of wrong line, assume first line */
data = LCD_SET_DDADR + LCD_DDADR_LINE1;
break;
}
return data;
}
void lcd_setcursor(uint8_t x, uint8_t y)
{
uint8_t data;
data = lcd_get_set_cursor_cmd(x, y);
lcd_command(data);
}
@ -191,13 +206,38 @@ void lcd_string(const char *data)
lcd_data((uint8_t)*data++);
}
static void lcd_port_init()
{
LCD_DPORT->MODER &= MODER_DELETE(LCD_E) & MODER_DELETE(LCD_RS) & MODER_DELETE(LCD_DATA_BIT_OFFSET) &
MODER_DELETE(LCD_DATA_BIT_OFFSET + 1) & MODER_DELETE(LCD_DATA_BIT_OFFSET + 2) &
MODER_DELETE(LCD_DATA_BIT_OFFSET + 3);
LCD_DPORT->MODER |= OUTPUT(LCD_E) | OUTPUT(LCD_RS) | OUTPUT(LCD_DATA_BIT_OFFSET) |
OUTPUT(LCD_DATA_BIT_OFFSET + 1) | OUTPUT(LCD_DATA_BIT_OFFSET + 2) |
OUTPUT(LCD_DATA_BIT_OFFSET + 3);
}
static void lcd_clear_shadow_buff()
{
int i, j;
for (i = 0; i < 4; i++) {
for (j = 0; j < 21; j++) {
shadow_display[i][j] = 0x0;
}
}
}
void lcd_init(void)
{
int i;
rcc_manager_enable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(LCD_RCC_MASK));
lcd_port_init();
lcd_port_clear();
lcd_clear_shadow_buff();
systick_wait_ms(100);
LCD_DPORT->ODR |= (0x3 << LCD_DATA_BIT_OFFSET);
@ -237,3 +277,173 @@ void lcd_deinit()
lcd_port_clear();
rcc_manager_disable_clock(&RCC->AHB1ENR, BITMASK_TO_BITNO(LCD_RCC_MASK));
}
static uint8_t compare_input_to_shadow(const char (*display_buffer)[21])
{
uint8_t ret = 0;
int i, row;
for (row = 0; row < 4; row++) {
for (i = 0; i < 20; i++) {
if (display_buffer[row][i] != shadow_display[row][i]) {
ret |= (1U<<row);
break;
}
}
}
return ret;
}
static void lcd_fsm_enable(bool en)
{
__ASM("nop");
__ASM("nop");
__ASM("nop");
if (en)
LCD_DPORT->ODR |= LCD_E_MASK;
else
LCD_DPORT->ODR &= ~LCD_E_MASK;
__ASM("nop");
__ASM("nop");
__ASM("nop");
}
static void lcd_fsm_write_command(bool high, uint8_t cmd)
{
lcd_port_clear();
if (high)
lcd_out((cmd >> 4) & 0x0F);
else
lcd_out((cmd) & 0x0F);
}
static void lcd_fsm_write_data(bool high, uint8_t data)
{
LCD_DPORT->ODR |= (1<<LCD_RS);
if (high)
lcd_out((data >> 4) & 0x0F);
else
lcd_out((data) & 0x0F);
}
enum lcd_fsm_ret lcd_fsm_write_buffer(const char (*display_buffer)[21])
{
static bool idle = true;
static uint8_t rows_to_handle = 0;
static uint32_t state_cnt;
static uint8_t row_cnt = 0;
static uint32_t char_cnt;
static uint32_t line_len;
static uint64_t timestamp = 0ULL;
enum lcd_fsm_ret ret;
ret = LCD_FSM_NOP;
if (idle) {
rows_to_handle = compare_input_to_shadow(display_buffer);
memcpy(shadow_display, display_buffer, sizeof(shadow_display));
shadow_display[0][20] = 0;
shadow_display[1][20] = 0;
shadow_display[2][20] = 0;
shadow_display[3][20] = 0;
state_cnt = 0;
row_cnt = 0;
idle = false;
}
if (rows_to_handle == 0) {
idle = true;
return ret;
}
if ((rows_to_handle & (1<<row_cnt))) {
switch (state_cnt) {
case 0:
lcd_fsm_write_command(true, lcd_get_set_cursor_cmd(0, row_cnt));
line_len = strlen(&shadow_display[row_cnt][0]);
char_cnt = 0;
lcd_fsm_enable(true);
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
break;
case 1:
lcd_fsm_enable(false);
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
break;
case 2:
lcd_fsm_write_command(false, lcd_get_set_cursor_cmd(0, row_cnt));
lcd_fsm_enable(true);
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
break;
case 3:
lcd_fsm_enable(false);
ret = LCD_FSM_WAIT_CALL;
timestamp = systick_get_global_tick();
state_cnt++;
break;
case 4:
if (!systick_ticks_have_passed(timestamp, 5)) {
ret = LCD_FSM_WAIT_CALL;
} else {
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
}
break;
case 5:
lcd_fsm_write_data(true, (char_cnt >= line_len) ? ' ' : shadow_display[row_cnt][char_cnt]);
lcd_fsm_enable(true);
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
break;
case 6:
lcd_fsm_enable(false);
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
break;
case 7:
lcd_fsm_write_data(false, (char_cnt >= line_len) ? ' ' : shadow_display[row_cnt][char_cnt]);
lcd_fsm_enable(true);
ret = LCD_FSM_WAIT_CALL;
state_cnt++;
break;
case 8:
lcd_fsm_enable(false);
ret = LCD_FSM_WAIT_CALL;
char_cnt++;
if (char_cnt < 20) {
state_cnt = 5;
} else {
state_cnt = 0;
rows_to_handle &= (uint8_t)~(1U<<row_cnt);
if (row_cnt < 3) {
row_cnt++;
} else {
idle = true;
row_cnt = 0;
}
}
break;
default:
ret = LCD_FSM_NOP;
idle = true;
rows_to_handle = 0U;
break;
}
} else {
if (row_cnt < 3) {
row_cnt++;
ret = LCD_FSM_CALL_AGAIN;
} else {
row_cnt = 0;
ret = LCD_FSM_NOP;
}
}
return ret;
}