SPI2 clock

[pinwu]

Posted on December 16, 2009 at 07:45

SPI2 clock

[asterix]

Posted on May 17, 2011 at 12:20

Hi pinwu1,

PB13 (SPI2_CLK) is used in the Evaluation board from ST (MB525) to drive the TFT LCD and is working fine on my board, I suggest you to re-check your code for sure you have something missing in the initilisation. :)

Magigimix

[pinwu]

Posted on May 17, 2011 at 12:20

Hello,

I modified the evaluation board source codes to use SPI2 as a master, but I could get clock signal for PB13.

[pinwu]

Posted on May 17, 2011 at 12:20

Quote:

On 27-12-2007 at 19:41, Anonymous wrote:

Hi pinwu1,

PB13 (SPI2_CLK) is used in the Evaluation board from ST (MB525) to drive the TFT LCD and is working fine on my board, I suggest you to re-check your code for sure you have something missing in the initilisation. :)

Magigimix

[pinwu]

Posted on May 17, 2011 at 12:20

I studied that part of source code. That clock for LCD is not generated by SPI internal clock. I simplified the code to initialize SPI registers and releated clocks only. I tested on this way, and found SPI1 working, but not SPI2.

For STM32F103RB chip, both SPI1 and SPI2 not working.

Thank You,

[asterix]

Posted on May 17, 2011 at 12:20

Dear pinwu1,

I think that you mising part is in line :

/* Enable SPI1 and GPIOA clocks */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);

// RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2 | RCC_APB2Periph_GPIOB, ENABLE);

SPI2 is connected in APB1 and not like SPI1 which is connected to APB2 with all GPIOs.

So the right code to enbale SPI2 is something like :

/* Enable SPI2 and GPIOB clocks */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

Tell me if it is working well now ;) Magigimix ;)

[pinwu]

Posted on May 17, 2011 at 12:20

I posted my part of source code here.

void Set_System()

{

GPIO_InitTypeDef GPIO_InitStructure;

// if (mode == 1) { // DFU mode

// FLASH_Unlock();

// }

/* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ------------*/

/* RCC system reset(for debug purpose) */

RCC_DeInit();

/* Enable HSE */

RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready */

HSEStartUpStatus = RCC_WaitForHSEStartUp();

if(HSEStartUpStatus == SUCCESS)

{

/* HCLK = SYSCLK */

RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */

RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */

RCC_PCLK1Config(RCC_HCLK_Div2);

/* ADCCLK = PCLK2/6 */

RCC_ADCCLKConfig(RCC_PCLK2_Div6);

/* Flash 2 wait state */

FLASH_SetLatency(FLASH_Latency_2);

/* Enable Prefetch Buffer */

FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* PLLCLK = 8MHz * 9 = 72 MHz */

RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL */

RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready */

while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)

{

}

/* Select PLL as system clock source */

RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source */

while(RCC_GetSYSCLKSource() != 0x08)

{

}

/* USBCLK = PLLCLK / 1.5 */

RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);

/* Enable USB clock */

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);

}

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |RCC_APB2Periph_GPIOC

| RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE | RCC_APB2Periph_AFIO, ENABLE);

USB_Cable_Config (DISABLE);

SPI_FLASH_Init();

USB_Cable_Config (ENABLE);

}

int main(void)

{

#ifdef DEBUG

debug();

#endif

Set_System();

while (1)

{

SPI_FLASH_ReadID(); // Test Only

}

}

void SPI_FLASH_Init(void)

{

SPI_InitTypeDef SPI_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

/* Enable SPI1 and GPIOA clocks */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);

// RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2 | RCC_APB2Periph_GPIOB, ENABLE);

/* Configure SPI1 pins: NSS, SCK, MISO and MOSI */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;

// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

// GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configure PA.4 as Output push-pull, used as Flash Chip select */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

GPIO_Init(GPIOA, &GPIO_InitStructure);

// GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Deselect the FLASH: Chip Select high */

SPI_FLASH_CS_HIGH();

/* SPI1 configuration */

SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;

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_4;

SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;

SPI_InitStructure.SPI_CRCPolynomial = 7;

SPI_Init(SPI1, &SPI_InitStructure);

// SPI_Init(SPI2, &SPI_InitStructure);

/* Enable SPI1 */

SPI_Cmd(SPI1, ENABLE);

// SPI_Cmd(SPI2, ENABLE);

}

In spi_flash.h,

/* Exported macro ---------*/

/* Select SPI FLASH: ChipSelect pin low */

#define SPI_FLASH_CS_LOW() GPIO_ResetBits(GPIOA, GPIO_Pin_4)

// #define SPI_FLASH_CS_LOW() GPIO_ResetBits(GPIOB, GPIO_Pin_12)

/* Deselect SPI FLASH: ChipSelect pin high */

#define SPI_FLASH_CS_HIGH() GPIO_SetBits(GPIOA, GPIO_Pin_4)

// #define SPI_FLASH_CS_HIGH() GPIO_SetBits(GPIOB, GPIO_Pin_12)

[ This message was edited by: pinwu1 on 28-12-2007 00:22 ]

[pinwu]

Posted on May 17, 2011 at 12:20

For the evaluation borad, both SPI1 and SPI2 are working. I found that SPI_FLASH_SendByte was hard-coded for SPI1.

Thank You Magigimix

[pinwu]

Posted on May 17, 2011 at 12:20

Dear Magigimix,

Thank you for your correction. It does still not work for SPI2 with this correction. Is there something wrong?

PinWu

[ivan1]

Posted on May 17, 2011 at 12:20

My project has also this problem. The clk of SPI2 does not work at all, but there is signal on MOSI pin.

Already set like this RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

Quote:

On 28-12-2007 at 15:48, Anonymous wrote:

Dear pinwu1,

I think that you mising part is in line :

/* Enable SPI1 and GPIOA clocks */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1 | RCC_APB2Periph_GPIOA, ENABLE);

// RCC_APB2PeriphClockCmd(RCC_APB1Periph_SPI2 | RCC_APB2Periph_GPIOB, ENABLE);

SPI2 is connected in APB1 and not like SPI1 which is connected to APB2 with all GPIOs.

So the right code to enbale SPI2 is something like :

/* Enable SPI2 and GPIOB clocks */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

Tell me if it is working well now ;) Magigimix ;)

[abhinavbose87]

Posted on May 17, 2011 at 12:20

I too followed the corrected code and the clk signal is not available on PB13. anybody got it working?