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i2c test and display

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This commit is contained in:
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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70
fw/main.c
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@ -3,17 +3,21 @@
#include <stdio.h>
#include <fsusb.h>
#include "lib_i2c.h"
#include "display.h"
// Pin definitions
#define PIN_LED PA4 // debug led
#define PIN_VBUS PA0 // vbus voltage feedback
#define PIN_CURRENT PA1 // current feedback
#define PIN_NTC PA2 // ntc temperature sensor
#define PIN_TEMP PA3 // thermocouple amplifier
#define PIN_12V PA5 // 12V regulator enable
#define PIN_HEATER PA6 // power mosfet gate control
#define PIN_ENC_A PB3 // rotary encoder A
#define PIN_ENC_B PB11 // rotary encoder B
#define PIN_BTN PB1 // rotary encoder button
#define PIN_LED PA4 // debug led
#define PIN_VBUS PA0 // vbus voltage feedback
#define PIN_CURRENT PA1 // current feedback
#define PIN_NTC PA2 // ntc temperature sensor
#define PIN_TEMP PA3 // thermocouple amplifier
#define PIN_12V PA5 // 12V regulator enable
#define PIN_HEATER PA6 // power mosfet gate control
#define PIN_ENC_A PB3 // rotary encoder A
#define PIN_ENC_B PB11 // rotary encoder B
#define PIN_BTN PB1 // rotary encoder button
// Analog channel definitions
#define VBUS_ADC_CHANNEL ANALOG_0 // PA0
@ -32,6 +36,7 @@ const int16_t ntc_table[64] = {
};
u8g2_t *u8g2;
uint8_t pin = 0;
int16_t encoder = 0; // rotary encoder counter
uint32_t last_interrupt = 0; // last time the encoder interrupt was triggered
@ -58,6 +63,12 @@ static inline int16_t get_tip_temp_k(uint16_t adc_reading, int16_t cold_temp_k)
}
void print_i2c_device(uint8_t addr)
{
printf("Device found at 0x%02X\n", addr);
}
// this callback is mandatory when FUNCONF_USE_USBPRINTF is defined,
// can be empty though
void handle_usbfs_input(int numbytes, uint8_t *data)
@ -81,8 +92,21 @@ void handle_usbfs_input(int numbytes, uint8_t *data)
printf(
"Available commands:\n"
"\tr : toggle the 12V regulator\n"
"\td : init display\n"
"\ts : scan I2C bus\n"
);
break;
case 'd':
printf("Initializing display...\n");
u8g2 = display_init();
u8g2_ClearBuffer(u8g2);
u8g2_DrawBox(u8g2, 0, 0, 20, 10);
u8g2_SendBuffer(u8g2);
break;
case 's':
printf("Scanning I2C bus...\n");
i2c_scan(I2C1, print_i2c_device);
break;
default:
printf("Unknown command '%c'\n", data[0]);
break;
@ -129,6 +153,8 @@ __attribute__((noreturn)) int main(void)
funDigitalWrite(PIN_12V, 0);
funPinMode(PIN_HEATER, GPIO_CFGLR_OUT_10Mhz_PP);
funDigitalWrite(PIN_HEATER, 0);
funPinMode(PIN_DISP_RST, GPIO_CFGLR_OUT_10Mhz_PP);
funDigitalWrite(PIN_DISP_RST, 1); // start with display disabled
funPinMode(PIN_ENC_A, GPIO_CFGLR_IN_PUPD); // enable pull-up/down
funDigitalWrite(PIN_ENC_A, 1); // specify pull-up
@ -136,6 +162,30 @@ __attribute__((noreturn)) int main(void)
funDigitalWrite(PIN_ENC_B, 1); // specify pull-up
funPinMode(PIN_BTN, GPIO_CFGLR_IN_FLOAT);
Delay_Ms(5000);
/* -------- Code to get hardware I2C working on the CH32X035F8U6 -------- */
// Order here matters, first initialize the AFIO and I2C subsystems then
// change register values, do that the other way around and the configuration
// wont take effect
// Enable AFIO (Alternate Function IO)
RCC->APB2PCENR |= RCC_AFIOEN;
// Init I2C
i2c_init(I2C_TARGET, FUNCONF_SYSTEM_CORE_CLOCK, 100000);
// To utilize the I2C bus we need to disable SWD first, since the pins overlap
AFIO->PCFR1 &= ~(0b0111 << 24);
AFIO->PCFR1 |= 0b0100 << 24;
// Map SCL to PC18 and SDA to PC19
AFIO->PCFR1 |= 0b0101 << 2;
// Manually set the I2C pins to Alternate Function IO, CNF=10b, MODE=10b
GPIOC->CFGXR &= ~((0xF << 8) | (0xF << 12)); // first clear the bits
// then set them
GPIOC->CFGXR |= 0b1010 << 8; // PC18
GPIOC->CFGXR |= 0b1010 << 12; // PC19
// Configure the IO as an interrupt.
// PIN_ENC_B is on port B, channel 11
AFIO->EXTICR1 = AFIO_EXTICR1_EXTI11_PB; // Port B channel (pin) 11