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Diffstat (limited to 'c/src/lib/libbsp/lm32/milkymist/Documentation/uart.txt')
| -rw-r--r-- | c/src/lib/libbsp/lm32/milkymist/Documentation/uart.txt | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/c/src/lib/libbsp/lm32/milkymist/Documentation/uart.txt b/c/src/lib/libbsp/lm32/milkymist/Documentation/uart.txt deleted file mode 100644 index b5b93043e9..0000000000 --- a/c/src/lib/libbsp/lm32/milkymist/Documentation/uart.txt +++ /dev/null @@ -1,31 +0,0 @@ -Initialization : - - set the CSR_UART_DIVISOR to the correct VALUE, - depending on the internal frequency of the LatticeMico32 softcore. - - for the ML401 board, this value is calculated using this formula : clk_frequency/230400/16 - clk_frequency = 100000000 Hz - => we must set CSR_UART_DIVISOR to 27 - -How to send a byte to uart : - -void writechar(char c) -{ - CSR_UART_RXTX = c; - while(!(irq_pending() & IRQ_UARTTX)); - irq_ack(IRQ_UARTTX); -} - -How to receive a byte from uart : - - -char readchar() -{ - char c; - while(!(irq_pending() & IRQ_UARTRX)); - irq_ack(IRQ_UARTRX); - c = CSR_UART_RXTX; - return c; -} - - |