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STM8S examples using SDCC

There’s not a great number of useful examples for the stm8s chips that use sdcc. This repository aims to fix this. The examples are currently targeting the STM8S103F3P6 and were tested with the according dev board that is available online for <1$.

Resources

Run

  1. You’ll need a programmer, e.g. stlink-v2 or the esp8266-based esp-stlink
  2. Get stm8flash.
$ make
$ stm8flash -c stlinkv2 -p stm8s103f3 -w led.ihx

Examples

LED & Timer

led.c sets up a timer and uses the onboard LED to blink in defined intervals.

Serial

serial.c demos using the UART to transmit serial data.

Interrupts

  • serial_interrupt.c sets up an interrupt handler to perform serial transmission without busy wait.
  • gpio_interrupt.c wakes up from halt mode via external gpio interrupt on B4.

PWM

sound.c uses a timer and an interrupt to create 8-bit PWM output on a pin. You can directly attach a speaker and will hear a low-volume tone:

Oscilloscope View of PWM output

For better sound-quality add a 2.2μF capacitor to GND as a low-pass filter:

Oscilloscope View of PWM output with capacitor

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