Posted on May 17, 2011 at 13:05Quote:
On 03-03-2009 at 15:28, Anonymous wrote:
Hello,
I try to write a block on a SDIO card. For that I need to set the wide bus (4-bit) operation mode (meaning data would be transferred on D[3.0])
On the datasheet of the STM32F103 it says:
Wide bus (4-bit bus width) operation mode is selected or deselected using
SET_BUS_WIDTH (ACMD6).
The device I plugged on the SDIO doesn t support the command 6. It only supports command 52 (IO_RW_DIRECT) and command 53 (IO_RW_EXTENDED).
Would anybody know how to set the SDIO bus width on 4 bits on a STM32F103?
Thanks in advance.
SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_4b;
You can follow the example:
SDIO_InitTypeDef SDIO_InitStructure;
SDIO_InitStructure.SDIO_ClockDiv = 0xB2;
SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
SDIO_InitStructure.SDIO_MCLKBypass = SDIO_MCLKBypass_Disable;
SDIO_InitStructure.SDIO_ClockPowerSave =
SDIO_ClockPowerSave_Enable;
SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_4b;
SDIO_InitStructure.SDIO_HardwareFlowControl =
SDIO_HardwareFlowControl_Enable;
SDIO_Init(&SDIO_InitStructure);
