156 lines
3.4 KiB
C
156 lines
3.4 KiB
C
/*
|
|
* Single-File-Header for SSD1306 SPI interface
|
|
* 05-05-2023 E. Brombaugh
|
|
*/
|
|
|
|
#ifndef _SSD1306_SPI_H
|
|
#define _SSD1306_SPI_H
|
|
|
|
// control pins
|
|
#ifndef SSD1306_RST_PIN
|
|
#define SSD1306_RST_PIN PC2
|
|
#endif
|
|
|
|
#ifndef SSD1306_CS_PIN
|
|
#define SSD1306_CS_PIN PC3
|
|
#endif
|
|
|
|
#ifndef SSD1306_DC_PIN
|
|
#define SSD1306_DC_PIN PC4
|
|
#endif
|
|
|
|
#ifndef SSD1306_MOSI_PIN
|
|
#define SSD1306_MOSI_PIN PC6
|
|
#endif
|
|
|
|
#ifndef SSD1306_SCK_PIN
|
|
#define SSD1306_SCK_PIN PC5
|
|
#endif
|
|
|
|
#ifndef SSD1306_BAUD_RATE_PRESCALER
|
|
#define SSD1306_BAUD_RATE_PRESCALER SPI_BaudRatePrescaler_2
|
|
#endif
|
|
|
|
#ifndef SSD1306_SOFT_SPI
|
|
#define SSD1306_SOFT_SPI 0
|
|
#endif
|
|
|
|
/*
|
|
* init SPI and GPIO for SSD1306 OLED
|
|
*/
|
|
uint8_t ssd1306_spi_init(void)
|
|
{
|
|
// Enable GPIOC and SPI
|
|
#ifdef CH5xx
|
|
#else
|
|
RCC->APB2PCENR |= RCC_APB2Periph_SPI1;
|
|
#endif
|
|
|
|
funGpioInitAll();
|
|
funPinMode( SSD1306_RST_PIN, GPIO_CFGLR_OUT_50Mhz_PP );
|
|
funPinMode( SSD1306_CS_PIN, GPIO_CFGLR_OUT_50Mhz_PP );
|
|
funPinMode( SSD1306_DC_PIN, GPIO_CFGLR_OUT_50Mhz_PP );
|
|
#if defined( CH5xx ) || SSD1306_SOFT_SPI
|
|
funPinMode( SSD1306_MOSI_PIN, GPIO_CFGLR_OUT_50Mhz_PP );
|
|
funPinMode( SSD1306_SCK_PIN, GPIO_CFGLR_OUT_50Mhz_PP );
|
|
#else
|
|
funPinMode( SSD1306_MOSI_PIN, GPIO_CFGLR_OUT_50Mhz_AF_PP );
|
|
funPinMode( SSD1306_SCK_PIN, GPIO_CFGLR_OUT_50Mhz_AF_PP );
|
|
#endif
|
|
|
|
funDigitalWrite( SSD1306_RST_PIN, FUN_HIGH );
|
|
funDigitalWrite( SSD1306_CS_PIN, FUN_HIGH );
|
|
funDigitalWrite( SSD1306_DC_PIN, FUN_LOW );
|
|
|
|
// Configure SPI
|
|
#if SSD1306_SOFT_SPI
|
|
funDigitalWrite( SSD1306_SCK_PIN, FUN_HIGH );
|
|
#elif defined( CH5xx )
|
|
R8_SPI0_CLOCK_DIV = FUNCONF_SYSTEM_CORE_CLOCK / 12000000; // 16MHz is the fastest I want to go - though it does seem to work up to ~60MHz.
|
|
R8_SPI0_CTRL_MOD = RB_SPI_ALL_CLEAR;
|
|
R8_SPI0_CTRL_MOD = RB_SPI_MOSI_OE | RB_SPI_2WIRE_MOD | RB_SPI_SCK_OE;
|
|
R8_SPI0_CTRL_MOD |= RB_SPI_MST_SCK_MOD;
|
|
// | RB_SPI_MST_SCK_MOD; // Mode 3 / mode 0
|
|
R8_SPI0_CTRL_CFG = RB_MST_CLK_SEL;
|
|
#else
|
|
SPI1->CTLR1 =
|
|
SPI_NSS_Soft | SPI_CPHA_1Edge | SPI_CPOL_Low | SPI_DataSize_8b |
|
|
SPI_Mode_Master | SPI_Direction_1Line_Tx |
|
|
SSD1306_BAUD_RATE_PRESCALER;
|
|
|
|
// enable SPI port
|
|
SPI1->CTLR1 |= CTLR1_SPE_Set;
|
|
#endif
|
|
|
|
// always succeed
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* toggle reset line
|
|
*/
|
|
void ssd1306_rst(void)
|
|
{
|
|
funDigitalWrite( SSD1306_RST_PIN, FUN_LOW );
|
|
Delay_Ms(10);
|
|
funDigitalWrite( SSD1306_RST_PIN, FUN_HIGH );
|
|
}
|
|
|
|
/*
|
|
* packet send for blocking polled operation via spi
|
|
*/
|
|
uint8_t ssd1306_pkt_send(const uint8_t *data, int sz, uint8_t cmd)
|
|
{
|
|
if(cmd)
|
|
{
|
|
funDigitalWrite( SSD1306_DC_PIN, FUN_LOW );
|
|
}
|
|
else
|
|
{
|
|
funDigitalWrite( SSD1306_DC_PIN, FUN_HIGH );
|
|
}
|
|
|
|
funDigitalWrite( SSD1306_CS_PIN, FUN_LOW );
|
|
|
|
// send data
|
|
while(sz--)
|
|
{
|
|
#if SSD1306_SOFT_SPI
|
|
uint8_t c = *data++;
|
|
int i = 8;
|
|
do
|
|
{
|
|
funDigitalWrite( SSD1306_SCK_PIN, FUN_LOW ); ADD_N_NOPS(1)
|
|
funDigitalWrite( SSD1306_MOSI_PIN, !!(c & 0x80) ); ADD_N_NOPS(1)
|
|
funDigitalWrite( SSD1306_SCK_PIN, FUN_HIGH ); ADD_N_NOPS(1)
|
|
c<<=1;
|
|
} while( --i );
|
|
|
|
#elif defined( CH5xx )
|
|
while(! (R8_SPI0_INT_FLAG & RB_SPI_FREE) );
|
|
R8_SPI0_BUFFER = *data++;
|
|
#else
|
|
// wait for TXE
|
|
while(!(SPI1->STATR & SPI_STATR_TXE));
|
|
|
|
// Send byte
|
|
SPI1->DATAR = *data++;
|
|
#endif
|
|
}
|
|
|
|
// wait for not busy before exiting
|
|
#if SSD1306_SOFT_SPI
|
|
// Nothing needed here.
|
|
#elif defined( CH5xx )
|
|
while( !(R8_SPI0_INT_FLAG & RB_SPI_FREE)) { }
|
|
#else
|
|
while(SPI1->STATR & SPI_STATR_BSY) { }
|
|
#endif
|
|
|
|
funDigitalWrite( SSD1306_CS_PIN, FUN_HIGH );
|
|
|
|
// we're happy
|
|
return 0;
|
|
}
|
|
|
|
#endif
|