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i2c test and display

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Alessandro Mauri 2026-04-16 13:09:24 +02:00
parent 9e254e0fb1
commit dae0fbcbda
9 changed files with 552 additions and 14 deletions
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#include <u8g2.h>
#include <ch32fun.h>
#include <stdio.h>
#include "display.h"
#include "lib_i2c.h"
/*
* GPIO and delay callback for u8g2/u8x8 display driver
*/
static u8g2_t u8g2;
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:
// called once during init phase of u8g2/u8x8
// can be used to setup pins
printf("TODO: U8X8_MSG_GPIO_AND_DELAY_INIT\n");
break;
case U8X8_MSG_DELAY_NANO:
// delay arg_int * 1 nano second
// at 48MHz 1 cycle = 20ns, 1 nop = 1 cycle
// the for lopp takes about 2 cycles per iteration
for (int i = 0; i < (arg_int/(20*3)); i++) {
asm("nop");
}
break;
case U8X8_MSG_DELAY_100NANO:
// delay arg_int * 100 nano seconds
// at 48MHz 1 cycle = 20ns, 1 nop = 1 cycle
// the for lopp takes about 2 cycles per iteration
for (int i = 0; i < ((arg_int*100)/(20*3)); i++) {
asm("nop");
}
break;
case U8X8_MSG_DELAY_10MICRO:
// delay arg_int * 10 micro seconds
Delay_Us(arg_int*10);
break;
case U8X8_MSG_DELAY_MILLI:
// delay arg_int * 1 milli second
Delay_Ms(arg_int);
break;
case U8X8_MSG_DELAY_I2C:
// arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
// arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
printf("TODO: U8X8_MSG_DELAY_I2C\n");
break;
case U8X8_MSG_GPIO_D0:
// D0 or SPI clock pin: Output level in arg_int
//case U8X8_MSG_GPIO_SPI_CLOCK:
break;
case U8X8_MSG_GPIO_D1:
// D1 or SPI data pin: Output level in arg_int
//case U8X8_MSG_GPIO_SPI_DATA:
break;
case U8X8_MSG_GPIO_D2:
// D2 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D3:
// D3 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D4:
// D4 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D5:
// D5 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D6:
// D6 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_D7:
// D7 pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_E:
// E/WR pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS:
// CS (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_DC:
// DC (data/cmd, A0, register select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_RESET:
funDigitalWrite(PIN_DISP_RST, arg_int);
// Reset pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS1:
// CS1 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_CS2:
// CS2 (chip select) pin: Output level in arg_int
break;
case U8X8_MSG_GPIO_I2C_CLOCK:
// arg_int=0: Output low at I2C clock pin
// arg_int=1: Input dir with pullup high for I2C clock pin
break;
case U8X8_MSG_GPIO_I2C_DATA:
// arg_int=0: Output low at I2C data pin
// arg_int=1: Input dir with pullup high for I2C data pin
break;
case U8X8_MSG_GPIO_MENU_SELECT:
// get menu select pin state
u8x8_SetGPIOResult(u8x8, 0);
break;
case U8X8_MSG_GPIO_MENU_NEXT:
// get menu next pin state
u8x8_SetGPIOResult(u8x8, 0);
break;
case U8X8_MSG_GPIO_MENU_PREV:
// get menu prev pin state
u8x8_SetGPIOResult(u8x8, 0);
break;
case U8X8_MSG_GPIO_MENU_HOME:
// get menu home pin state
u8x8_SetGPIOResult(u8x8, 0);
break;
default:
// default return value
u8x8_SetGPIOResult(u8x8, 1);
break;
}
return 1;
}
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;
uint8_t *data;
switch(msg) {
case U8X8_MSG_BYTE_INIT:
break;
case U8X8_MSG_BYTE_SEND:
data = (uint8_t*)arg_ptr;
while (arg_int > 0) {
buffer[buffer_idx++] = *data;
data++;
arg_int--;
}
break;
case U8X8_MSG_BYTE_START_TRANSFER:
buffer_idx = 0;
break;
case U8X8_MSG_BYTE_END_TRANSFER:
i2c_sendBytes(I2C_TARGET, u8x8_GetI2CAddress(u8x8) >> 1, buffer, buffer_idx);
break;
default:
return 0;
}
return 1;
}
u8g2_t* display_init(void)
{
#if SSD1306_128X32 && SSD1306_128X32 == 1
u8g2_Setup_ssd1306_i2c_128x32_univision_f(&u8g2, U8G2_R0, u8x8_byte_i2c, u8x8_gpio_and_delay);
#elif SSD1312_96X16 && SSD1312_96X16 == 1
// NOTE: display size is wrong, hardware is 96x16, but driver is configured for 120x28
u8g2_Setup_ssd1312_i2c_120x28_f(&u8g2, U8G2_R0, u8x8_byte_i2c, u8x8_gpio_and_delay);
#endif
// TODO: log errors and return NULL on failure
u8g2_InitDisplay(&u8g2);
u8g2_SetPowerSave(&u8g2, 0);
return &u8g2;
}