#include "main.h"
#include "stm32l100c_discovery.h"
#include "ssd1306.h"
#define LED_POWER GPIOB,GPIO_Pin_9
#define LED_STAT GPIOA,GPIO_Pin_15
// TODO: Grab buttonpresses with interrupts
#define SW_BTN GPIOB, GPIO_Pin_3
#define SW_UP GPIOB, GPIO_Pin_7
#define SW_DOWN GPIOB, GPIO_Pin_6
#define SW_LEFT GPIOB, GPIO_Pin_5
#define SW_RIGHT GPIOB, GPIO_Pin_4
static __IO uint32_t TimingDelay;
void init_gpio();
void init_spi();
int main(void)
{
// Init clocks
SystemInit();
RCC_ClocksTypeDef RCC_Clocks;
// SysTick end of count event each 1ms
RCC_GetClocksFreq(&RCC_Clocks);
SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);
GPIO_ResetBits(LED_STAT);
Delay(100);
init_gpio();
init_spi();
ssd1306_Init();
ssd1306_DrawPoint(3,3,1);
ssd1306_DrawPoint(5,5,0);
GPIO_SetBits(LED_POWER);
Delay(500);
GPIO_ResetBits(LED_POWER);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
while(1)
uint8_t sw_btn = GPIO_ReadInputDataBit(SW_BTN);
uint8_t sw_up = GPIO_ReadInputDataBit(SW_UP);
uint8_t sw_down = GPIO_ReadInputDataBit(SW_DOWN);
uint8_t sw_left = GPIO_ReadInputDataBit(SW_LEFT);
uint8_t sw_right = GPIO_ReadInputDataBit(SW_RIGHT);
SPI_I2S_SendData(SPI2,0xFA);
SPI_I2S_SendData(SPI1,0xFA);
if(!GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_3)) {
GPIO_ToggleBits(LED_STAT);
}
// ssd1306_DrawPoint(5,5,0);
Delay(150);
/**
* @brief Inserts a delay time.
* @param nTime: specifies the delay time length, in 1 ms.
* @retval None
*/
void Delay(__IO uint32_t nTime)
TimingDelay = nTime;
while(TimingDelay != 0);
* @brief Decrements the TimingDelay variable.
* @param None
void TimingDelay_Decrement(void)
if (TimingDelay != 0x00)
TimingDelay--;
void init_spi(void)
SPI_InitTypeDef SPI_InitStructure;
// OLED IC
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
@@ -136,25 +162,25 @@ void init_gpio(void) {
/*Configure GPIO pin : PA */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
GPIO_Init(GPIOA, &GPIO_InitStruct);
/*Configure GPIO pin : PB */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6
|GPIO_Pin_7;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStruct);
/** SPI1 GPIO Configuration
PA5 ------> SPI1_SCK
PA7 ------> SPI1_MOSI
/*Enable or disable the AHB peripheral clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
Status change: