文章详情页您现在的位置是：网站首页>文章详情

Spi非自动计算配置参数含义

WBK 发表于：2020年1月7日 15:28 分类：【嵌入式软件】 2848次阅读

在EB配置Spi模块过程中如果禁用SpiAutoCalcBaudParams，则需要配置SPI相关的参数(TQ, Q, A, B, C)。

如果禁用SpiAutoCalcDelayParams (CS_VIA_PERIPHERAL_ENGINE)，则需要配置SPI相关的参数(IPRE, IDLE, LPRE, LEAD, TPRE,TRAIL)。

相关参数的定义如下（来自infineon文档）：

SpiAutoCalcBaudParams：

This parameter enables/disables the automatic calculation of qspi baudrate parameters.

If the parameter is set to TRUE, then the configuration tool will automatically generate the Baudrate parameters (TQ, Q, A, B, C) based on theparameter SpiBaudrate.

SpiQSpiParamTq：

This parameter defines Qspi TQ Hw parameter

Global Time Quantum Length

Common n-divider scaling the baud rates of all channels in direction of higher or

lower baud rates.

0D division by 1

1D division by 2

...

255D division by 256

SpiQSpiParamQ：

This parameter defines Qspi Q Hw parameter. This defines the time quantum length used by A, B, and C to define the baud rate and duty cycle

000000B - 1

000001B - 2

....

111111B - 64

SpiQSpiParamA：

This parameter defines Qspi A Hw parameter

Bit Segment 1

Length expressed in quanta of Q

00B - 1

01B - 2

10B - 3

11B - 4

SpiQSpiParamB：

This parameter defines Qspi B Hw parameter.

Bit Segment 2

Length expressed in quanta of Q

00B - 0

01B - 1

10B - 2

11B - 3

SpiQSpiParamC：

This parameter defines Qspi C Hw parameter.

Bit Segment 3

Length expressed in quanta of Q

00B - 0 (if B=0, than C is minimum 1 per hardware)

01B - 1

10B - 2

11B - 3

Note: If SpiQSpiParamB = 0, then SpiQSpiParamC should have minimum of value 1

SpiAutoCalcDelayParams:

This parameter enables/disables the automatic calculation of qspi Delay parameters. If the parameter is set to TRUE, then the configuration tool will automatically generate the delay parameters (IPRE, IDLE, LPRE, LEAD, TPRE,TRAIL) based on the parameters SpiIdleTime, SpiTimeClk2CS, SpiTrailingTime.

SpiQSpiParamTPre：

Prescaler for the Trailing Delay

Length in TQSPI units

000B - 1

001B - 4

010B - 16

...

111B - 16384

SpiQSpiParamTrail：

Trailing Delay Length

Defines the length of the trailing delay, in TQSPI units pre scaled with TPRE

0D - 1 units