This is a board support folder for the STM8L-Discovery demo board with an STM8L152C6 device and an LCD.

The code in this folder is the work of @plumbum!

Peripheral register addresses are assumed to be the same throughout the STM8L Medium density and High density devies. Addresses imported from \res MCU: STM8L will work (but obviously "High density only" peripherals can't be used). If you spot a problem please file an issue.

Using e4thcom as a terminal program is recommended. With the help of e4thcom (or codeload.py) mcu/STM8L101.efr can be used for loading STM8L051 peripheral register address constants:

\res MCU: STM8L
\res SYSCFG_RMPCR1 CLK_PCKENR1

The following options in globconf.inc controlls port assignments options of the USART:

• ALT_USART_STM8L = 0: USART_TX on PC3 and USART_RX on PC2
• ALT_USART_STM8L = 1: USART_TX on PA2 and USART_RX on PA3 (default)
• ALT_USART_STM8L = 2: USART_TX on PC6 and USART_RX on PC5

The USART can be configured as HAS_HALFDUPLEX: by setting HAS_HALFDUPLEX = 1 in globconf.inc the selected USART_TX switches betweens TX and RX:

               .
STM8L device   .      .----o serial TxD "TTL"
               .      |      (e.g. "CH340" USB serial converter)
               .     ---
               .     / \  1N4148
               .     ---
               .      |
USART_TX     -->>-----*----o serial RxD "TTL
               .
GND------------>>----------o serial GND
               .
               .

This feature can free up one more GPIO for other uses, or it can be used for creating a simple bus.

Of course, it's also possible to use a simulate

If you want to use I2C the jumper SB17 needs to be opened since I2C is in conflict with the User Button.

Connect I2C bus to:

• PC0 [I2C_SDA]
• PC1 [I2C_SCL]

Basic functions integrated into boardcore.inc.

• LCDF ( b -- ) \ Fill LCD display with value.
• LCD! ( w a -- ) \ Write code w to LCD position a[0:5].

You can enable or disable it with HAS_LCD constant in globconf.inc.

• HAS_LCD=0 - disable.
• HAS_LCD>0 - enable. Value use by LCDF.

\ Display 'STM8EF'
0 lcdf
$00ed 0 lcd! \ S
$1201 1 lcd! \ T
$0536 2 lcd! \ M
$00ff 3 lcd! \ 8
$0079 4 lcd! \ E
$0071 5 lcd! \ F