mitchell/chess_tile
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

idek

Browse Source
This commit is contained in:
Mitchell Marino 2025-11-17 12:07:01 -06:00
parent 3e063e12b0
commit 36f179566b
2 changed files with 20 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
src/i2c_slave.c
View File

@ -1,41 +1,32 @@
#include "ch32v00x.h"
#include "i2c_slave.h"
#include <stdio.h>
// https://pallavaggarwal.in/2023/10/05/ch32v003-programming-i2c-eeprom/
void i2c_init() {
GPIO_InitTypeDef GPIO_InitStructure={0};
I2C_InitTypeDef I2C_InitTSturcture={0};
// Enable clocks
RCC->APB2ENR |= RCC_APB2ENR_IOPBEN;
RCC->APB1ENR |= RCC_APB1ENR_I2C1EN;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
// Set PB6/PB7 to AF Open-Drain
GPIOB->CFGLR &= ~((0xF << (4 * 6)) | (0xF << (4 * 7)));
GPIOB->CFGLR |= (0xF << (4 * 6)) | (0xF << (4 * 7)); // 0xF = AF OD 50MHz
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
I2C1->CTLR1 = I2C_CTLR1_SWRST;
I2C1->CTLR1 = 0;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
I2C1->OADDR1 = (address << 1) & 0xFE;
I2C1->OADDR1 |= I2C_OADDR1_ADDMODE; // 7-bit addr
I2C_InitTSturcture.I2C_ClockSpeed = 100*1000;
I2C_InitTSturcture.I2C_Mode = I2C_Mode_I2C;
I2C_InitTSturcture.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitTSturcture.I2C_OwnAddress1 = I2C_SLAVE_ADDR;
I2C_InitTSturcture.I2C_Ack = I2C_Ack_Enable;
I2C_InitTSturcture.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C1->CTLR2 = 36; // 36 MHz APB1
NVIC_EnableIRQ(I2C1_EV_IRQn); // Event interrupt
NVIC_SetPriority(I2C1_EV_IRQn, 2 << 4);
NVIC_EnableIRQ(I2C1_ER_IRQn); // Error interrupt
NVIC_SetPriority(I2C1_ER_IRQn, 2 << 4);
I2C1->STAR1 = 0;
I2C1->STAR2 = 0;
I2C_Init(I2C1, &I2C_InitTSturcture);
I2C1->CTLR1 |= I2C_CTLR1_ACK | I2C_CTLR1_PE;
I2C1->CTLR1 |= I2C_CTLR1_ITBUFEN | I2C_CTLR1_ITEVTEN;
I2C_Cmd(I2C1, ENABLE);
I2C_AcknowledgeConfig(I2C1, ENABLE);
NVIC_EnableIRQ(I2C1_EV_IRQn);
}
void I2C1_EV_IRQHandler(void) {

5
src/i2c_slave.h
View File

@ -7,7 +7,8 @@
void i2c_init();
void I2C1_EV_IRQHandler(void) __attribute__((interrupt));
void I2C1_ER_IRQHandler(void) __attribute__((interrupt));
void I2C1_EV_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
void I2C1_ER_IRQHandler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
#endif /* I2C_SLAVE_H */