Grant Whitacre
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Articles
Recent activity by Grant Whitacre-
Q&A: Why doesn't the Makefile work in the SDK's Apollo3_EVB BSP folder?
Full question(s): I need to make a change to the default pin mapping, and I am trying to rebuild the am_bsp_pins.c and .h files for Apollo3 in the SDK 2.1.0 release. However, after I make my chang...
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Q&A: How can I get visibility to HAL and BSP C-code execution when debugging?
Full question(s): I want to have visibility of, and single-step through, C code execution for HAL and BSP functions while debugging. What do I need to set in the IDE to do that? Answer(s): In I...
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Q&A: Do Ambiq RTCs prevent POR from occurring as part of its noise immunity?
Full question(s): I am concerned about the noise immunity of AM1805AQ and AM0805AQ. VCC drop causing POR is described on page 44 of AM18x5 Datasheet. High frequency noise (about 10 ns pulse) exis...
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Q&A: How do you program OTP Flash on Apollo MCUs?
Full question(s): How do you program One-time-programmable (OTP) Flash on Apollo MCUs? Where can I find information about it? Are there HAL functions in the AmbiqSuite SDK for programming and re...
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Q&A: What are Apollo2's power supplies and domains?
Full question(s): Q&A: What are Apollo2's power supply inputs and what do they power internally? Answer(s): The diagram below shows all the input/output power domains for Apollo2. The three inp...
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Q&A: How to work around the incorrect CLKOUT settings in am_hal_clkgen_clkout_e?
Full question(s): The values in the enumeration am_hal_clkgen_clkout_e in SDK2.1.0 do not match Apollo3's datasheet 0.9.1. Thus the CLKOUT does not function as expected. How can this be worked ar...
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Q&A: Is there an example showing how to use the CQ_RAW mode?
Full question(s): Is there an example showing how to use the CQ_RAW mode in MSPI to IOM transfers? (The CQ Raw feature enables pre-constructed CQ using the raw interface). Answer(s): Yes. See at...
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Q&A: Why am I getting a bus fault error when I run XIP code?
Full question(s): I am running execute-in-place (XIP) code with the MSPI module on the Apollo3 Blue, and I am experiencing bus fault errors. This fault is indicated in the core's BusFault Status R...
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Q&A: What is the max STIMER clock and how is it selected?
Full question(s): What is the max STIMER clock and how is it selected? Is the max STIMER clock (F_HFRC/16 = 3 MHz) as described in Table 790 of the Apollo2 Datasheet also applicable when CTIMER...
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Q&A: What is the difference between the BUSY and TXBUSY bits in the UART Flag Register?
The difference between the TXBUSY and BUSY bits is that the TXBUSY bit indicates that the UART is in the middle of a transmit operation and when it clears, the TXCMP bit is set. The TXBUSY bit is t...