eurorack/midi2cv/drivers/display.cc

142 lines
3.5 KiB
C++

#include "display.h"
#include "gpio.h"
#include "spi_mode.h"
#include "stmlib/system/system_clock.h"
#include <U8g2lib.h>
#include <stm32f37x_conf.h>
#include <u8g2.h>
using namespace stmlib;
static const uint16_t kPinEnable = GPIO_Pin_2;
static const uint16_t kPinReset = GPIO_Pin_0;
static const uint16_t kPinDataCommand = GPIO_Pin_9;
static uint8_t* default_buf;
static uint8_t second_buf[1024];
static uint8_t* output_buf;
uint8_t u8x8_stm32_gpio_and_delay(U8X8_UNUSED u8x8_t* u8x8,
U8X8_UNUSED uint8_t msg, U8X8_UNUSED uint8_t arg_int,
U8X8_UNUSED void* arg_ptr)
{
return 1;
}
uint8_t u8x8_byte_4wire_hw_spi(u8x8_t* u8x8, uint8_t msg, uint8_t arg_int,
void* arg_ptr)
{
uint8_t* data;
switch (msg) {
case U8X8_MSG_BYTE_SEND:
data = (uint8_t*)arg_ptr;
while (arg_int > 0) {
while (!(SPI2->SR & SPI_SR_TXE)) {
}
SPI_SendData8(SPI2, (uint8_t)*data);
arg_int--;
data++;
}
break;
case U8X8_MSG_BYTE_INIT:
break;
case U8X8_MSG_BYTE_SET_DC:
if (arg_int)
GPIO_WriteBit(GPIOB, kPinDataCommand, Bit_SET);
else
GPIO_WriteBit(GPIOB, kPinDataCommand, Bit_RESET);
break;
case U8X8_MSG_BYTE_START_TRANSFER:
InitSPI(SPI_MODE_DISPLAY);
GPIO_WriteBit(GPIOB, kPinEnable, Bit_RESET);
break;
case U8X8_MSG_BYTE_END_TRANSFER:
GPIO_WriteBit(GPIOB, kPinEnable, Bit_SET);
break;
default:
return 0;
}
return 1;
}
class U8G2_SH1106_128x64_NONAME_F_SPI : public U8G2 {
public:
U8G2_SH1106_128x64_NONAME_F_SPI()
: U8G2()
{
u8g2_Setup_sh1106_128x64_noname_f(&this->u8g2, U8G2_R0, u8x8_byte_4wire_hw_spi, u8x8_stm32_gpio_and_delay);
output_buf = default_buf = this->u8g2.tile_buf_ptr;
/*u8g2_InitDisplay(&u8g2_);
u8g2_SetContrast(&u8g2_, 255);
u8g2_SetPowerSave(&u8g2_, 0);*/
}
};
U8G2_SH1106_128x64_NONAME_F_SPI u8g2_;
U8G2* Display::u8g2()
{
return &u8g2_;
}
void Display::Init()
{
// init SS/CS/RST GPIO
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
GPIO_InitTypeDef gpio_init;
gpio_init.GPIO_Mode = GPIO_Mode_OUT;
gpio_init.GPIO_OType = GPIO_OType_PP;
gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Pin = kPinEnable | kPinReset | kPinDataCommand;
GPIO_Init(GPIOB, &gpio_init);
GPIO_WriteBit(GPIOB, kPinEnable, Bit_SET);
// init AF GPIO
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
gpio_init.GPIO_Mode = GPIO_Mode_AF;
gpio_init.GPIO_OType = GPIO_OType_PP;
gpio_init.GPIO_Speed = GPIO_Speed_50MHz;
gpio_init.GPIO_PuPd = GPIO_PuPd_NOPULL;
gpio_init.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_Init(GPIOB, &gpio_init);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_5);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_5);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_5);
// init SPI
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
SPI_I2S_DeInit(SPI2);
// Initialize SPI
InitSPI(SPI_MODE_DISPLAY);
GPIO_WriteBit(GPIOB, kPinReset, Bit_RESET);
asm("nop");
GPIO_WriteBit(GPIOB, kPinReset, Bit_SET);
InitGLib();
}
void Display::InitGLib()
{
u8g2_.begin();
}
void Display::Flush()
{
uint8_t* cache = u8g2_.getU8g2()->tile_buf_ptr;
u8g2_.getU8g2()->tile_buf_ptr = output_buf;
u8g2_.sendBuffer();
u8g2_.getU8g2()->tile_buf_ptr = cache;
}
void Display::Swap()
{
output_buf = u8g2_.getU8g2()->tile_buf_ptr;
if (output_buf == default_buf)
u8g2_.getU8g2()->tile_buf_ptr = second_buf;
else
u8g2_.getU8g2()->tile_buf_ptr = default_buf;
}