AM2634: AM263的ECAP功能引脚有多少个？芯片手册上目前只有一个

Datasheet的特性介绍有10个ECAP，

但是在引脚配置表上只有一个

想问一下其余9个是哪个引脚？

Shine：

和其他管脚复用的。请参考下面说明。

There is an example in the SDK which configures the ECAP input, please see: https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/08_02_00_28/exports/docs/api_guide_am263x/EXAMPLES_DRIVERS_ECAP_CAPTURE_PWM.html. This example configures: GPIO61 -> INPUTXBAR Output 0 -> ECAP0 Input 202.

The ECAP and INPUTXBAR are configured in Syscfg:

 ECAP

"ECAP Input" : Selects ECAP input signal. Selection is "Capture input is InputXBar Output 0".

INPUTXBAR

"Instance" : Selects Input XBAR Instance. Input XBAR 0 is selected, corresponding to ECAP selected input.
"XBAR Output" : Selects signal for XBAR Output. GPIO61 is selected.

For more details, please refer to these documents on ti.com:

AM263x TRM, https://www.ti.com/lit/pdf/spruj17
AM263x TRM Registers Addendum, https://www.ti.com/lit/pdf/spruj42

ECAP

Input signal options: Ref #1, Table 7-144. eCAP Input Selection
ECAPn (n=0…9) register written to select particular source: Ref #2, Figure 3-350. CONTROLSS_ECAP0_ECCTL0 for example

Input XBAR

Ref #1, Section 7.4.10.1 INPUTXBAR
Ref #2, Section 3.12 C2K_INPUTXBAR Registers
Input XBAR n (n=0…31) register written to select particular source:

CONTROLSS_INPUTXBAR_INPUTXBARn_GSEL
CONTROLSS_INPUTXBAR_INPUTXBARn_G0
CONTROLSS_INPUTXBAR_INPUTXBARn_G1

The SENT output could be connected to a GPIO input.