SDIO Clock at 48mHz, D3:0 at F, CMD line works. Thank you.

Posted on February 27, 2012 at 22:14

My SDIO clock won't divide(stuck at 48mHz) and the data lines are stuck high. I've fiddle with every setting and checked the PLL several times. Can anyone spot my mistake. Thank you.

Using STM32F407

uint32_t regSDIO_CLKCR;

GPIO_InitTypeDef GPIO_InitStructure;

SDIO_InitTypeDef SDIO_InitStructure;

/* GPIOC and GPIOD Periph clock enable */

RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOC | RCC_AHB1Periph_GPIOD, ENABLE );

/* Enable the SDIO APB2 Clock */

RCC_APB2PeriphClockCmd( RCC_APB2Periph_SDIO, ENABLE );

/* Configure PC.12 pin: CLK pin */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;

GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIOC->BSRRL = GPIO_Pin_12;

GPIOC->BSRRH = GPIO_Pin_12;

GPIOC->BSRRL = GPIO_Pin_12;

GPIOC->BSRRH = GPIO_Pin_12;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_Init(GPIOC, &GPIO_InitStructure);

/* Configure PD.02 CMD line */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;

GPIO_Init(GPIOD, &GPIO_InitStructure);

/* Configure PC.08, PC.09, PC.10, PC.11 pins: D0, D1, D2, D3 pins */

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;

GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource8, GPIO_AF_SDIO);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource9, GPIO_AF_SDIO);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_SDIO);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_SDIO);

GPIO_PinAFConfig(GPIOC, GPIO_PinSource12, GPIO_AF_SDIO);

GPIO_PinAFConfig(GPIOD, GPIO_PinSource2, GPIO_AF_SDIO);

SDIO_InitStructure.SDIO_ClockDiv = 32;//SDIO_INIT_CLK_DIV;

SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;

SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Enable;

SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;

SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_4b;

SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;

SDIO_Init(&SDIO_InitStructure);

/*!< Set Power State to ON */

SDIO_SetPowerState(SDIO_PowerState_ON);

regSDIO_CLKCR = SDIO->CLKCR;

LCD_SetCursor ( 0, 0 );

sprintf( tmp, ''CLOCK %h'', regSDIO_CLKCR);

LCD_write_str((unsigned char *)tmp);

/*!< Enable SDIO Clock */

SDIO_ClockCmd(ENABLE);

regSDIO_CLKCR = SDIO->CLKCR;

LCD_SetCursor ( 0, 1 );

sprintf( tmp, ''CLOCK %h'', regSDIO_CLKCR);

LCD_write_str((unsigned char *)tmp);

while( 1 )

{

//CMD0 Go idle.

SDIO_CmdInitTypeDef SDIO_CmdInitStructure; //Structure.

SDIO_CmdInitStructure.SDIO_Argument = 0x0;

SDIO_CmdInitStructure.SDIO_CmdIndex = 0;

SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_No;

SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;

SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;

SDIO_SendCommand(&SDIO_CmdInitStructure);

}

stm32-sdio-sdio_clk-clock-48mhz