Last week we released an alpha version of RP2040js to NPM, the JavaScript package manager. We spent the first hour of the stream tidying up the code, setting up the tooling and preparing the release.

Then, in a sharp turn, we went back to working on the code: refactoring the peripherals, implementing narrow I/O register writes, adding a missing variant of the CMP instruction, and even creating the Timer peripheral. 

Our new goal is to get hello_serial to run. Unlike hello_uart, it uses a set of high-level APIs, including printf() and sleep_ms(). That's also the reason we needed the Timer:

In the next episode, we'll keep working on the Timer, and probably also implement the Nested Vectored Interrupt Controller (NVIC), to let us fire interrupts from our virtual peripherals.