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137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
#include <generated/csr.h>
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#include "exceptions.h"
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#include "rtio.h"
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#define RTIO_O_STATUS_FULL 1
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#define RTIO_O_STATUS_UNDERFLOW 2
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#define RTIO_O_STATUS_SEQUENCE_ERROR 4
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#define RTIO_I_STATUS_EMPTY 1
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#define RTIO_I_STATUS_OVERFLOW 2
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long long int previous_fud_end_time;
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void rtio_init(void)
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{
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previous_fud_end_time = 0;
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rtio_reset_write(1);
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rtio_reset_write(0);
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}
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static void write_and_process_status(long long int timestamp, int channel)
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{
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int status;
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rtio_o_we_write(1);
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status = rtio_o_status_read();
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if(status) {
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if(status & RTIO_O_STATUS_FULL)
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while(rtio_o_status_read() & RTIO_O_STATUS_FULL);
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if(status & RTIO_O_STATUS_UNDERFLOW) {
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rtio_o_underflow_reset_write(1);
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exception_raise_params(EID_RTIO_UNDERFLOW,
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timestamp, channel, rtio_get_counter());
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}
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if(status & RTIO_O_STATUS_SEQUENCE_ERROR) {
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rtio_o_sequence_error_reset_write(1);
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exception_raise_params(EID_RTIO_SEQUENCE_ERROR,
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timestamp, channel, 0);
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}
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}
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}
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void rtio_set_o(long long int timestamp, int channel, int value)
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{
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rtio_chan_sel_write(channel);
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rtio_o_timestamp_write(timestamp);
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rtio_o_address_write(0);
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rtio_o_data_write(value);
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write_and_process_status(timestamp, channel);
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}
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void rtio_set_oe(long long int timestamp, int channel, int oe)
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{
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rtio_chan_sel_write(channel);
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rtio_o_timestamp_write(timestamp);
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rtio_o_address_write(1);
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rtio_o_data_write(oe);
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write_and_process_status(timestamp, channel);
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}
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void rtio_set_sensitivity(long long int timestamp, int channel, int sensitivity)
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{
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rtio_chan_sel_write(channel);
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rtio_o_timestamp_write(timestamp);
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rtio_o_address_write(2);
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rtio_o_data_write(sensitivity);
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write_and_process_status(timestamp, channel);
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}
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long long int rtio_get_counter(void)
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{
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rtio_counter_update_write(1);
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return rtio_counter_read();
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}
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long long int rtio_get(int channel, long long int time_limit)
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{
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long long int r;
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int status;
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rtio_chan_sel_write(channel);
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while((status = rtio_i_status_read())) {
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if(rtio_i_status_read() & RTIO_I_STATUS_OVERFLOW) {
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rtio_i_overflow_reset_write(1);
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exception_raise_params(EID_RTIO_OVERFLOW,
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channel, 0, 0);
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}
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if(rtio_get_counter() >= time_limit) {
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/* check empty flag again to prevent race condition.
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* now we are sure that the time limit has been exceeded.
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*/
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if(rtio_i_status_read() & RTIO_I_STATUS_EMPTY)
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return -1;
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}
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/* input FIFO is empty - keep waiting */
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}
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r = rtio_i_timestamp_read();
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rtio_i_re_write(1);
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return r;
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}
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void rtio_fud_sync(void)
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{
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while(rtio_get_counter() < previous_fud_end_time);
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}
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void rtio_fud(long long int fud_time)
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{
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long long int fud_end_time;
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int status;
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rtio_chan_sel_write(RTIO_FUD_CHANNEL);
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rtio_o_address_write(0);
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fud_end_time = fud_time + 3*8;
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previous_fud_end_time = fud_end_time;
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rtio_o_timestamp_write(fud_time);
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rtio_o_data_write(1);
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rtio_o_we_write(1);
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rtio_o_timestamp_write(fud_end_time);
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rtio_o_data_write(0);
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rtio_o_we_write(1);
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status = rtio_o_status_read();
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if(status) {
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if(status & RTIO_O_STATUS_UNDERFLOW) {
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rtio_o_underflow_reset_write(1);
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exception_raise_params(EID_RTIO_UNDERFLOW,
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fud_time, RTIO_FUD_CHANNEL, rtio_get_counter());
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}
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if(status & RTIO_O_STATUS_SEQUENCE_ERROR) {
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rtio_o_sequence_error_reset_write(1);
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exception_raise_params(EID_RTIO_SEQUENCE_ERROR,
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fud_time, RTIO_FUD_CHANNEL, 0);
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}
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}
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}
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