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start work on PID controller

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This commit is contained in:
Alessandro Mauri 2026-05-09 01:05:49 +02:00
parent f7f5a16d64
commit 0200e47327
5 changed files with 175 additions and 54 deletions
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88
fw/display.c
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@ -6,15 +6,17 @@
#include "lib_i2c.h"
/*
* GPIO and delay callback for u8g2/u8x8 display driver
*/
static u8g2_t u8g2;
static const char digits_lut[] =
"0001020304050607080910111213141516171819"
"2021222324252627282930313233343536373839"
"4041424344454647484950515253545556575859"
"6061626364656667686970717273747576777879"
"8081828384858687888990919293949596979899";
uint8_t u8x8_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
// GPIO and delay callback for u8g2/u8x8 display driver
static uint8_t u8x8_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
switch(msg) {
case U8X8_MSG_GPIO_AND_DELAY_INIT:
@ -129,7 +131,7 @@ uint8_t u8x8_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *ar
}
uint8_t u8x8_byte_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
static uint8_t u8x8_byte_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
static uint8_t buffer[32];
static uint8_t buffer_idx;
@ -173,5 +175,77 @@ u8g2_t* display_init(void)
u8g2_InitDisplay(&u8g2);
u8g2_SetPowerSave(&u8g2, 0);
u8g2_SetContrast(&u8g2, 255);
u8g2_SetBitmapMode(&u8g2, 1);
u8g2_SetFontMode(&u8g2, 1);
return &u8g2;
}
const char* u16toa(uint16_t value)
{
// Max uint16_t is 65535 (5 digits) + null terminator
static char buf[6];
char *p = &buf[5];
*p = '\0';
// Process two digits at a time using the LUT
while (value >= 100) {
const unsigned int idx = (value % 100) * 2;
value /= 100;
*--p = digits_lut[idx + 1];
*--p = digits_lut[idx];
}
// Handle the remaining value (< 100)
if (value < 10) {
*--p = (char)('0' + value);
} else {
const unsigned int idx = value * 2;
*--p = digits_lut[idx + 1];
*--p = digits_lut[idx];
}
return p;
}
const char* i16toa(int16_t value)
{
static char buf[7];
uint16_t uval;
bool negative = false;
if (value < 0) {
negative = true;
uval = (uint16_t)-value;
} else {
uval = (uint16_t)value;
}
char *p = &buf[6];
*p = '\0';
// Same LUT logic as unsigned
while (uval >= 100) {
const unsigned int idx = (uval % 100) * 2;
uval /= 100;
*--p = digits_lut[idx + 1];
*--p = digits_lut[idx];
}
if (uval < 10) {
*--p = (char)('0' + uval);
} else {
const unsigned int idx = uval * 2;
*--p = digits_lut[idx + 1];
*--p = digits_lut[idx];
}
if (negative) {
*--p = '-';
}
return p;
}