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#include "uart.h"
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#include "uart.h"
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static int led_status = 0;
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static int led_status = 0;
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static volatile int hashes_per_second = 0;
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static volatile int hashes_per_second = 0;
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void exception_handler(uint32_t cause, void * epc)
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// Handle an exception/interrupt.
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// Arguments:
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// - cause: exception cause, see potato.h for values
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// - epc: exception return address
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// - regbase: base of the stored context, can be used for printing all
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// registers with regbase[0] = x1 and upwards.
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void exception_handler(uint32_t cause, void * epc, void * regbase)
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{
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if(cause == (CAUSE_IRQ_BASE + 5)) // Timer interrupt
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{
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{
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uart_puts(IO_ADDRESS(UART_BASE), "Hashes per second: ");
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uart_puts(IO_ADDRESS(UART_BASE), "Hashes per second: ");
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uart_puth(IO_ADDRESS(UART_BASE), hashes_per_second);
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uart_puth(IO_ADDRESS(UART_BASE), hashes_per_second);
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uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
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uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
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} else {
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} else {
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gpio_set_output(IO_ADDRESS(GPIO2_BASE), 0);
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gpio_set_output(IO_ADDRESS(GPIO2_BASE), 0);
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led_status = 0;
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led_status = 0;
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}
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}
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timer_reset(IO_ADDRESS(TIMER_BASE));
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hashes_per_second = 0;
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hashes_per_second = 0;
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timer_reset(IO_ADDRESS(TIMER_BASE));
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} else {
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uart_puts(IO_ADDRESS(UART_BASE), "Unhandled exception!\n\r");
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uart_puts(IO_ADDRESS(UART_BASE), "Cause: ");
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uart_puth(IO_ADDRESS(UART_BASE), cause);
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uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
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uart_puts(IO_ADDRESS(UART_BASE), "EPC: ");
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uart_puth(IO_ADDRESS(UART_BASE), (uint32_t) epc);
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uart_puts(IO_ADDRESS(UART_BASE), "\n\r");
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while(1) asm volatile("nop\n");
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}
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}
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}
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int main(void)
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int main(void)
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{
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{
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// Configure GPIOs:
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// Configure GPIOs:
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gpio_set_direction(IO_ADDRESS(GPIO1_BASE), 0x0000); // Switches
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gpio_set_direction(IO_ADDRESS(GPIO1_BASE), 0x0000); // Switches
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gpio_set_direction(IO_ADDRESS(GPIO2_BASE), 0xffff); // LEDs
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gpio_set_direction(IO_ADDRESS(GPIO2_BASE), 0xffff); // LEDs
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// Set up the timer:
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// Set up the timer:
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timer_set(IO_ADDRESS(TIMER_BASE), 50000000);
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timer_set(IO_ADDRESS(TIMER_BASE), SYSTEM_CLK_FREQ);
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// Print a startup message:
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// Print a startup message:
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uart_puts(IO_ADDRESS(UART_BASE), "The Potato Processor SHA256 Benchmark\n\r\n\r");
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uart_puts(IO_ADDRESS(UART_BASE), "The Potato Processor SHA256 Benchmark\n\r\n\r");
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// Enable interrupts:
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// Enable interrupts:
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