SPI Cortex

[muhittin_kaplan]

systeminit i (168 mhz e göre ayarlı) çağırdığımda problemli bilgi gönderiyor. sebep clk dan da neden ?
mesaj birleştirme:: 14 Nisan 2014, 19:21:04
OSC me MCO çıkışını kontrol ettim 168mhz de olduğunda çalışmıyor. Eğer systeminit i çağırmazsam 16mhz de çalışıyor.

[muhittin_kaplan]

[b]SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8; // SPI frequency is APB2 frequency / 4[/b]

168mhz de prescaler_4 yapıldığında -Ya benim Logic Analizer Yanlış Gösteriyor- Yada SPI yetişemiyor.

[muhittin_kaplan]

#include <stm32f4xx.h>
	#include <stm32f4xx_rcc.h>
	#include <stm32f4xx_gpio.h>
	#include <stm32f4xx_tim.h>
	#include <stm32f4xx_spi.h>
	#include <misc.h>

	#define TLC_RCC_AHB1	RCC_AHB1Periph_GPIOB
	#define TLC5940_GPIO 	GPIOB
	#define PIN_BLANK   	GPIO_Pin_5
	#define PIN_VPRG    	GPIO_Pin_9
	#define PIN_XLAT    	GPIO_Pin_6
	#define PIN_GSCLK   	GPIO_Pin_3

	int timer_update=0;
	
	#define COUNT_TLC	1

void init_tim7(void){
	TIM_TimeBaseInitTypeDef TIM_TBInitStruct;
	NVIC_InitTypeDef NVIC_InitStructure;

	RCC_APB1PeriphClockCmd(RCC_APB1ENR_TIM7EN,ENABLE); // Timer saat kaynağını aç
	TIM_TBInitStruct.TIM_Prescaler =8299; // ÖnBölücü (PSC) değeri 4199
	TIM_TBInitStruct.TIM_Period =9; // Otomatik geri yükleme (ARR) eşiği 1
	TIM_TimeBaseInit(TIM7,&TIM_TBInitStruct); // Timeri init et

	TIM_ITConfig(TIM7, TIM_IT_Update, ENABLE); // Timer Update olayında interrupt istesin.
	NVIC_InitStructure.NVIC_IRQChannel = TIM7_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);


	TIM_Cmd(TIM7, ENABLE);// Timeri başlat
}

void TIM7_IRQHandler(void){

	TIM7->SR=0;
	GPIOD->ODR ^= GPIO_Pin_12;

	timer_update +=1;
}

void init_SPI1(void){

	GPIO_InitTypeDef GPIO_InitStruct;
	SPI_InitTypeDef SPI_InitStruct;

	// enable clock for used IO pins
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOD| TLC_RCC_AHB1, ENABLE);


	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_All;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(GPIOD, &GPIO_InitStruct);

	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_All;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(TLC5940_GPIO, &GPIO_InitStruct);

	/* configure pins used by SPI1
	 * PA5 = SCK
	 * PA6 = MISO
	 * PA7 = MOSI
	 */
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_6 | GPIO_Pin_5;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_Init(GPIOA, &GPIO_InitStruct);

	// connect SPI1 pins to SPI alternate function
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1);
	GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);

	// enable clock for used IO pins
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);

	/* Configure the chip select pin
	   in this case we will use PE7 */
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7;
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
	GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_Init(GPIOE, &GPIO_InitStruct);

	GPIOE->BSRRL |= GPIO_Pin_7; // set PE7 high

	// enable peripheral clock
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

	/* configure SPI1 in Mode 0
	 * CPOL = 0 --> clock is low when idle
	 * CPHA = 0 --> data is sampled at the first edge
	 */
	SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex; // set to full duplex mode, seperate MOSI and MISO lines
	SPI_InitStruct.SPI_Mode = SPI_Mode_Master;     // transmit in master mode, NSS pin has to be always high
	SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b; // one packet of data is 8 bits wide
	SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;        // clock is low when idle
	SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;      // data sampled at first edge
	SPI_InitStruct.SPI_NSS = SPI_NSS_Soft | SPI_NSSInternalSoft_Set; // set the NSS management to internal and pull internal NSS high
	SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16; // SPI frequency is APB2 frequency / 4
	SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;// data is transmitted MSB first
	SPI_Init(SPI1, &SPI_InitStruct);

	SPI_Cmd(SPI1, ENABLE); // enable SPI1
}

/* This funtion is used to transmit and receive data
 * with SPI1
 * 			data --> data to be transmitted
 * 			returns received value
 */
uint8_t SPI1_send(uint8_t data){

	SPI_I2S_SendData(SPI1,data);
	//SPI1->DR = data; // write data to be transmitted to the SPI data register
	while( !(SPI1->SR & SPI_I2S_FLAG_TXE) ); // wait until transmit complete
	while( !(SPI1->SR & SPI_I2S_FLAG_RXNE) ); // wait until receive complete
	while( SPI1->SR & SPI_I2S_FLAG_BSY ); // wait until SPI is not busy anymore
	return SPI1->DR; // return received data from SPI data register
}

void _delay(int value){
	while(value--)
	{

	}
}

void Blank_Pulse(){

	GPIO_SetBits(TLC5940_GPIO,PIN_BLANK);
	GPIO_ResetBits(TLC5940_GPIO,PIN_BLANK);
	//TLC5940_GPIO->ODR |=BLANK_PIN;
	//TLC5940_GPIO->ODR &=0x00000000;
}

void Xlat_Pulse(){

	GPIO_SetBits(TLC5940_GPIO,PIN_XLAT);
	GPIO_ResetBits(TLC5940_GPIO,PIN_XLAT);

	//TLC5940_GPIO->ODR |=XLAT_PIN;
	//TLC5940_GPIO->ODR &=0x00000000;

}

void GSCLK_Pulse(){
	GPIO_SetBits(TLC5940_GPIO,PIN_GSCLK);
	GPIO_ResetBits(TLC5940_GPIO,PIN_GSCLK);
	//TLC5940_GPIO->ODR |=GSCLK_PIN;
	//TLC5940_GPIO->ODR &=0x00000000;

}

void MCO2_INIT(){
	GPIO_InitTypeDef  GPIO_InitStructure;

		  // Output HSE clock (8 MHz) on MCO pin (PC9)
		  RCC_MCO2Config(RCC_MCO2Source_SYSCLK, RCC_MCO2Div_5);

		  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);

		  GPIO_StructInit(&GPIO_InitStructure);

		  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
		  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
		  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
		  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
		  GPIO_Init(GPIOC, &GPIO_InitStructure);
		  GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_MCO);

}

int main(void){
		SystemInit(); //168mhz
		init_tim7();
		init_SPI1();
		MCO2_INIT();


		uint8_t received_val = 0;

		uint_fast8_t n;
																																			   //LED0
			u16 data[COUNT_TLC* 16]={0x0000 ,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000};
			
			
			GPIO_ResetBits(TLC5940_GPIO,PIN_VPRG);

			while(1){

			GPIO_SetBits(GPIOD,GPIO_Pin_12);

			while(timer_update>3){
				data[15] +=16;
				if (data[15]>4095) {
					data[15]=0;
				}
				GPIO_SetBits(TLC5940_GPIO,PIN_BLANK);
				
					for(n=0; n<(COUNT_TLC* 16); n=n+2)
						{
							SPI1_send(data[n]>>4);
							SPI1_send((data[n]<<4) | (data[n+1])>>8);
							SPI1_send(data[n+1]);
						}

					GPIOE->BSRRL |= GPIO_Pin_7; // set PE7 (CS) high
					GPIO_ResetBits(GPIOD,GPIO_Pin_12);
					GPIOE->BSRRH |= GPIO_Pin_7;



					_delay(1);
					GPIO_SetBits(TLC5940_GPIO,PIN_XLAT);
					_delay(1);
					GPIO_ResetBits(TLC5940_GPIO,PIN_BLANK);
					GPIO_ResetBits(TLC5940_GPIO,PIN_XLAT);
					_delay(1);

					timer_update=0;
			 }

					 int i;
			            //generate GSCLK
			            for (i = 0; i < 4096; i++){
			            	TLC5940_GPIO->BSRRL = PIN_GSCLK;
			             	TLC5940_GPIO->BSRRH = PIN_GSCLK;
			           		}
			            Blank_Pulse();

			}
}