I'm implementing as I'm learning. In the process, so far I've developed,

1. GPIO Driver.
2. SPI Driver.
3. I2C Driver.
4. Not soon enough.

1. USART_RX_TX. (with and without interrupt)
2. STM32 Clock configuration. HSE clock up to 16MHz, HSI up to 8MHz and all using the Phase Locked Loop (PLL) engine, clock upto 180MHz(Peak).
3. STM32 Timers. BASIC, GENERAL, ADVANCED TIMERS with interrupts.
4. STM32 PWM for LED, PWM in gneral.
5. DMA applications. UARTtoSRAM, SRAM1toSRAM2, ADCtoSRAM
6. Added UART Interrupt. For multiple interrupts. (Also resolved mutiple bytes UART Interrupt recieve.)