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https://opencores.org/ocsvn/neorv32/neorv32/trunk
[/] [neorv32/] [trunk/] [sw/] [lib/] [source/] [neorv32_uart.c] - Diff between revs 65 and 66
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| Rev 65 |
Rev 66 |
| Line 254... |
Line 254... |
uint32_t clock = NEORV32_SYSINFO.CLK;
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uint32_t clock = NEORV32_SYSINFO.CLK;
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uint16_t i = 0; // BAUD rate divisor
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uint16_t i = 0; // BAUD rate divisor
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uint8_t p = 0; // initial prsc = CLK/2
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uint8_t p = 0; // initial prsc = CLK/2
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// raw clock prescaler
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// raw clock prescaler
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#ifdef __riscv_div
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#ifndef make_bootloader
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// use div instructions
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i = (uint16_t)(clock / (2*baudrate));
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i = (uint16_t)(clock / (2*baudrate));
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#else
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#else
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// division via repeated subtraction
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// division via repeated subtraction (minimal size, only for bootloader)
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while (clock >= 2*baudrate) {
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while (clock >= 2*baudrate) {
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clock -= 2*baudrate;
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clock -= 2*baudrate;
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i++;
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i++;
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}
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}
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#endif
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#endif
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| Line 624... |
Line 623... |
uint32_t clock = NEORV32_SYSINFO.CLK;
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uint32_t clock = NEORV32_SYSINFO.CLK;
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uint16_t i = 0; // BAUD rate divisor
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uint16_t i = 0; // BAUD rate divisor
|
uint8_t p = 0; // initial prsc = CLK/2
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uint8_t p = 0; // initial prsc = CLK/2
|
|
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// raw clock prescaler
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// raw clock prescaler
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#ifdef __riscv_div
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#ifdef make_bootloader
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// use div instructions
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// use div instructions
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i = (uint16_t)(clock / (2*baudrate));
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i = (uint16_t)(clock / (2*baudrate));
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#else
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#else
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// division via repeated subtraction
|
// division via repeated subtraction (minimal size, only for bootloader)
|
while (clock >= 2*baudrate) {
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while (clock >= 2*baudrate) {
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clock -= 2*baudrate;
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clock -= 2*baudrate;
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i++;
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i++;
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}
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}
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#endif
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#endif
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