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| author | Vegard Storheil Eriksen <zyp@jvnv.net> | 2022-04-17 00:46:31 +0200 |
|---|---|---|
| committer | Vegard Storheil Eriksen <zyp@jvnv.net> | 2022-04-17 00:46:31 +0200 |
| commit | 2e31f5e437645bb6c21ace8c4fe9c435ff88bdec (patch) | |
| tree | 262faea4ae05ce603f3cded938cbe43e85b70980 | |
| parent | b1df70e6d0d119f7970931c1565db4da705677fc (diff) | |
stm32_uart: Use constraints to make helper functions compatible with all versions.
| -rw-r--r-- | uart/stm32_uart.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/uart/stm32_uart.h b/uart/stm32_uart.h index c4ba582..6db8305 100644 --- a/uart/stm32_uart.h +++ b/uart/stm32_uart.h @@ -2,6 +2,8 @@ #include <mmio/mmio.h> +#include <type_traits> + struct STM32_UART_reg_v1_t { volatile uint32_t SR; volatile uint32_t DR; @@ -42,10 +44,20 @@ struct STM32_UART_reg_lpv1_t { template <typename T> class STM32_UART_t : public mmio_ptr<T> { + static constexpr auto is_v1 = std::is_same_v<T, STM32_UART_reg_v1_t>; + static constexpr auto is_v2 = std::is_same_v<T, STM32_UART_reg_v2_t>; + static constexpr auto is_lpv1 = std::is_same_v<T, STM32_UART_reg_lpv1_t>; + public: using mmio_ptr<T>::ptr; - void write_blocking(uint8_t data) const { + void write_blocking(uint8_t data) const requires is_v1 { + // wait for TXE/TXFNF + while (!(ptr()->SR & (1<<7))); + ptr()->DR = data; + } + + void write_blocking(uint8_t data) const requires is_v2 || is_lpv1 { // wait for TXE/TXFNF while (!(ptr()->ISR & (1<<7))); ptr()->TDR = data; |