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

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:

1. AM263x TRM, https://www.ti.com/lit/pdf/spruj17
2. 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.