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196 lines (171 loc) · 6.64 KB
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#include "ch32v003fun.h"
#include "i2c_slave.h"
#include <stdio.h>
#include <stdbool.h>
// Board revision
#define HW_REV 2
uint8_t i2c_registers[] = {
0,0,0,0,0, // Keyboard data
0,64,0, // LED 1
64,0,0, // LED 2
0,0,64 // LED 3
};
void select_column(uint8_t column) {
GPIOD->BSHR |= 1 << (0 + ((column == 0) ? 0 : 16));
GPIOC->BSHR |= 1 << (0 + ((column == 1) ? 0 : 16));
GPIOC->BSHR |= 1 << (4 + ((column == 2) ? 0 : 16));
GPIOC->BSHR |= 1 << (3 + ((column == 3) ? 0 : 16));
GPIOC->BSHR |= 1 << (5 + ((column == 4) ? 0 : 16));
GPIOD->BSHR |= 1 << (2 + ((column == 5) ? 0 : 16));
GPIOC->BSHR |= 1 << (7 + ((column == 6) ? 0 : 16));
#if HW_REV > 1
GPIOD->BSHR |= 1 << (7 + ((column == 7) ? 0 : 16));
#else
GPIOC->BSHR |= 1 << (6 + ((column == 7) ? 0 : 16));
#endif
GPIOA->BSHR |= 1 << (2 + ((column == 8) ? 0 : 16));
GPIOA->BSHR |= 1 << (1 + ((column == 9) ? 0 : 16));
}
uint8_t read_keyboard() {
return ((GPIOD->INDR >> 6) & 1) | (((GPIOD->INDR >> 5) & 1) << 1) | (((GPIOD->INDR >> 4) & 1) << 2) | (((GPIOD->INDR >> 3) & 1) << 3);
}
void write_leds(uint8_t* data) __attribute__((optimize("O0")));
void write_leds(uint8_t* data) {
I2C1->CTLR2 &= ~(I2C_CTLR2_ITEVTEN); // Disable I2C event interrupt
for (uint8_t pos_byte = 0; pos_byte < 9; pos_byte++) {
for (int i = 7; i >= 0; i--) {
if ((data[pos_byte] >> i) & 1) {
// Send 1
__asm__("nop");__asm__("nop");
#if HW_REV > 1
GPIOC->BSHR |= 1 << (6);
#else
GPIOD->BSHR |= 1 << (7);
#endif
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");
#if HW_REV > 1
GPIOC->BSHR |= 1 << (6 + 16);
#else
GPIOD->BSHR |= 1 << (7 + 16);
#endif
} else {
// Send 0
#if HW_REV > 1
GPIOC->BSHR |= 1 << (6);
#else
GPIOD->BSHR |= 1 << (7);
#endif
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");
#if HW_REV > 1
GPIOC->BSHR |= 1 << (6 + 16);
#else
GPIOD->BSHR |= 1 << (7 + 16);
#endif
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
__asm__("nop");__asm__("nop");__asm__("nop");__asm__("nop");
}
}
}
I2C1->CTLR2 |= I2C_CTLR2_ITEVTEN; // Enable I2C event interrupt
}
bool i2c_changed = false;
void i2c_callback() {
i2c_changed = true;
}
int main() __attribute__((optimize("O0")));
int main() {
SystemInit();
SetupI2CSlave(0x9, 0, i2c_registers, sizeof(i2c_registers), i2c_callback);
// Enable GPIO ports
RCC->APB2PCENR |= RCC_APB2Periph_GPIOA;
RCC->APB2PCENR |= RCC_APB2Periph_GPIOC;
RCC->APB2PCENR |= RCC_APB2Periph_GPIOD;
// Configure GPIO A1 as output (C10)
GPIOA->CFGLR &= ~(0xf<<(4*1));
GPIOA->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*1);
// Configure GPIO A2 as output (C9)
GPIOA->CFGLR &= ~(0xf<<(4*2));
GPIOA->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*2);
// Configure GPIO C0 as output (C2)
GPIOC->CFGLR &= ~(0xf<<(4*0));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*0);
// Configure GPIO C3 as output (C4)
GPIOC->CFGLR &= ~(0xf<<(4*3));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*3);
// Configure GPIO C4 as output (C3)
GPIOC->CFGLR &= ~(0xf<<(4*4));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*4);
// Configure GPIO C5 as output (C5)
GPIOC->CFGLR &= ~(0xf<<(4*5));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*5);
#if HW_REV > 1
// Configure GPIO C6 as output (LED data)
GPIOC->CFGLR &= ~(0xf<<(4*6));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*6);
#else
// Configure GPIO C6 as output (C8)
GPIOC->CFGLR &= ~(0xf<<(4*6));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*6);
#endif
// Configure GPIO C7 as output (C7)
GPIOC->CFGLR &= ~(0xf<<(4*7));
GPIOC->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*7);
// Configure GPIO D0 as output (C1)
GPIOD->CFGLR &= ~(0xf<<(4*0));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*0);
// Configure GPIO D2 as output (C6)
GPIOD->CFGLR &= ~(0xf<<(4*2));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*2);
// Configure GPIO D3 as input (R4)
GPIOD->CFGLR &= ~(0xf<<(4*3));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_IN_PUPD)<<(4*3);
// Configure GPIO D4 as output (R3)
GPIOD->CFGLR &= ~(0xf<<(4*4));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_IN_PUPD)<<(4*4);
// Configure GPIO D5 as output (R2)
GPIOD->CFGLR &= ~(0xf<<(4*5));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_IN_PUPD)<<(4*5);
// Configure GPIO D6 as output (R1)
GPIOD->CFGLR &= ~(0xf<<(4*6));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_IN_PUPD)<<(4*6);
#if HW_REV > 1
// Configure GPIO D7 as output (C8)
GPIOD->CFGLR &= ~(0xf<<(4*7));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*7);
#else
// Configure GPIO D7 as output (LED data)
GPIOD->CFGLR &= ~(0xf<<(4*7));
GPIOD->CFGLR |= (GPIO_Speed_10MHz | GPIO_CNF_OUT_PP)<<(4*7);
#endif
write_leds(&i2c_registers[5]);
while (1) {
for (uint8_t i = 0; i < 5; i++) {
select_column(i*2);
Delay_Ms(5);
uint8_t value = read_keyboard();
select_column(i*2 + 1);
Delay_Ms(5);
value = (value << 4) | read_keyboard();
i2c_registers[i] = value;
}
if (i2c_changed) {
write_leds(&i2c_registers[5]);
i2c_changed = false;
}
}
}