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-rw-r--r--FT245.c601
1 files changed, 601 insertions, 0 deletions
diff --git a/FT245.c b/FT245.c
new file mode 100644
index 0000000..0b078d3
--- /dev/null
+++ b/FT245.c
@@ -0,0 +1,601 @@
+#include "FT245.h"
+#include <stdint.h>
+#include <stdbool.h>
+#include "circular_buffer.h"
+#include <stdatomic.h>
+
+static void data_out(ft245_t *ft245);
+static void data_in(ft245_t *ft245);
+static void bit_set(ft245_t *ft245, uint8_t bit);
+static void bit_reset(ft245_t *ft245, uint8_t bit);
+static bool tx_word(ft245_t *ft245);
+static bool rx_word(ft245_t *ft245);
+
+static atomic_flag lock = ATOMIC_FLAG_INIT;
+
+void ft245_init(ft245_t *ft245)
+{
+ data_in(ft245);
+
+ cb_init(ft245->buffer_rx, FT245_BUFFER_SIZE_RX);
+ cb_init(ft245->buffer_tx, FT245_BUFFER_SIZE_TX);
+
+ ft245->clk_state = false;
+ ft245->clk_count = 0;
+}
+
+static void data_out(ft245_t *ft245)
+{
+ ft245->DATA0_to_output();
+ ft245->DATA1_to_output();
+ ft245->DATA2_to_output();
+ ft245->DATA3_to_output();
+ ft245->DATA4_to_output();
+ ft245->DATA5_to_output();
+ ft245->DATA6_to_output();
+ ft245->DATA7_to_output();
+ ft245->DATA8_to_output();
+ ft245->DATA9_to_output();
+ ft245->DATA10_to_output();
+ ft245->DATA11_to_output();
+ ft245->DATA12_to_output();
+ ft245->DATA13_to_output();
+ ft245->DATA14_to_output();
+ ft245->DATA15_to_output();
+ ft245->DATA16_to_output();
+ ft245->DATA17_to_output();
+ ft245->DATA18_to_output();
+ ft245->DATA19_to_output();
+ ft245->DATA20_to_output();
+ ft245->DATA21_to_output();
+ ft245->DATA22_to_output();
+ ft245->DATA23_to_output();
+ ft245->DATA24_to_output();
+ ft245->DATA25_to_output();
+ ft245->DATA26_to_output();
+ ft245->DATA27_to_output();
+ ft245->DATA28_to_output();
+ ft245->DATA29_to_output();
+ ft245->DATA30_to_output();
+ ft245->DATA31_to_output();
+ ft245->BE0_to_output();
+ ft245->BE1_to_output();
+ ft245->BE2_to_output();
+ ft245->BE3_to_output();
+}
+
+static void data_in(ft245_t *ft245)
+{
+ ft245->DATA0_to_input();
+ ft245->DATA1_to_input();
+ ft245->DATA2_to_input();
+ ft245->DATA3_to_input();
+ ft245->DATA4_to_input();
+ ft245->DATA5_to_input();
+ ft245->DATA6_to_input();
+ ft245->DATA7_to_input();
+ ft245->DATA8_to_input();
+ ft245->DATA9_to_input();
+ ft245->DATA10_to_input();
+ ft245->DATA11_to_input();
+ ft245->DATA12_to_input();
+ ft245->DATA13_to_input();
+ ft245->DATA14_to_input();
+ ft245->DATA15_to_input();
+ ft245->DATA16_to_input();
+ ft245->DATA17_to_input();
+ ft245->DATA18_to_input();
+ ft245->DATA19_to_input();
+ ft245->DATA20_to_input();
+ ft245->DATA21_to_input();
+ ft245->DATA22_to_input();
+ ft245->DATA23_to_input();
+ ft245->DATA24_to_input();
+ ft245->DATA25_to_input();
+ ft245->DATA26_to_input();
+ ft245->DATA27_to_input();
+ ft245->DATA28_to_input();
+ ft245->DATA29_to_input();
+ ft245->DATA30_to_input();
+ ft245->DATA31_to_input();
+ ft245->BE0_to_input();
+ ft245->BE1_to_input();
+ ft245->BE2_to_input();
+ ft245->BE3_to_input();
+}
+
+static void bit_set(ft245_t *ft245, uint8_t bit)
+{
+ switch(bit) {
+ case 0:
+ ft245->DATA0_set();
+ break;
+ case 1:
+ ft245->DATA1_set();
+ break;
+ case 2:
+ ft245->DATA2_set();
+ break;
+ case 3:
+ ft245->DATA3_set();
+ break;
+ case 4:
+ ft245->DATA4_set();
+ break;
+ case 5:
+ ft245->DATA5_set();
+ break;
+ case 6:
+ ft245->DATA6_set();
+ break;
+ case 7:
+ ft245->DATA7_set();
+ break;
+ case 8:
+ ft245->DATA8_set();
+ break;
+ case 9:
+ ft245->DATA9_set();
+ break;
+ case 10:
+ ft245->DATA10_set();
+ break;
+ case 11:
+ ft245->DATA11_set();
+ break;
+ case 12:
+ ft245->DATA12_set();
+ break;
+ case 13:
+ ft245->DATA13_set();
+ break;
+ case 14:
+ ft245->DATA14_set();
+ break;
+ case 15:
+ ft245->DATA15_set();
+ break;
+ case 16:
+ ft245->DATA16_set();
+ break;
+ case 17:
+ ft245->DATA17_set();
+ break;
+ case 18:
+ ft245->DATA18_set();
+ break;
+ case 19:
+ ft245->DATA19_set();
+ break;
+ case 20:
+ ft245->DATA20_set();
+ break;
+ case 21:
+ ft245->DATA21_set();
+ break;
+ case 22:
+ ft245->DATA22_set();
+ break;
+ case 23:
+ ft245->DATA23_set();
+ break;
+ case 24:
+ ft245->DATA24_set();
+ break;
+ case 25:
+ ft245->DATA25_set();
+ break;
+ case 26:
+ ft245->DATA26_set();
+ break;
+ case 27:
+ ft245->DATA27_set();
+ break;
+ case 28:
+ ft245->DATA28_set();
+ break;
+ case 29:
+ ft245->DATA29_set();
+ break;
+ case 30:
+ ft245->DATA30_set();
+ break;
+ case 31:
+ ft245->DATA31_set();
+ break;
+ }
+}
+
+static void bit_reset(ft245_t *ft245, uint8_t bit)
+{
+ switch(bit) {
+ case 0:
+ ft245->DATA0_reset();
+ break;
+ case 1:
+ ft245->DATA1_reset();
+ break;
+ case 2:
+ ft245->DATA2_reset();
+ break;
+ case 3:
+ ft245->DATA3_reset();
+ break;
+ case 4:
+ ft245->DATA4_reset();
+ break;
+ case 5:
+ ft245->DATA5_reset();
+ break;
+ case 6:
+ ft245->DATA6_reset();
+ break;
+ case 7:
+ ft245->DATA7_reset();
+ break;
+ case 8:
+ ft245->DATA8_reset();
+ break;
+ case 9:
+ ft245->DATA9_reset();
+ break;
+ case 10:
+ ft245->DATA10_reset();
+ break;
+ case 11:
+ ft245->DATA11_reset();
+ break;
+ case 12:
+ ft245->DATA12_reset();
+ break;
+ case 13:
+ ft245->DATA13_reset();
+ break;
+ case 14:
+ ft245->DATA14_reset();
+ break;
+ case 15:
+ ft245->DATA15_reset();
+ break;
+ case 16:
+ ft245->DATA16_reset();
+ break;
+ case 17:
+ ft245->DATA17_reset();
+ break;
+ case 18:
+ ft245->DATA18_reset();
+ break;
+ case 19:
+ ft245->DATA19_reset();
+ break;
+ case 20:
+ ft245->DATA20_reset();
+ break;
+ case 21:
+ ft245->DATA21_reset();
+ break;
+ case 22:
+ ft245->DATA22_reset();
+ break;
+ case 23:
+ ft245->DATA23_reset();
+ break;
+ case 24:
+ ft245->DATA24_reset();
+ break;
+ case 25:
+ ft245->DATA25_reset();
+ break;
+ case 26:
+ ft245->DATA26_reset();
+ break;
+ case 27:
+ ft245->DATA27_reset();
+ break;
+ case 28:
+ ft245->DATA28_reset();
+ break;
+ case 29:
+ ft245->DATA29_reset();
+ break;
+ case 30:
+ ft245->DATA30_reset();
+ break;
+ case 31:
+ ft245->DATA31_reset();
+ break;
+ }
+}
+
+static bool byte_enabled_get(ft245_t *ft245, uint8_t byte)
+{
+ switch(byte) {
+ case 0:
+ ft245->BE0_to_input();
+ return (ft245->BE0_read() != 0);
+ case 1:
+ ft245->BE1_to_input();
+ return (ft245->BE1_read() != 0);
+ case 2:
+ ft245->BE2_to_input();
+ return (ft245->BE2_read() != 0);
+ case 3:
+ ft245->BE3_to_input();
+ return (ft245->BE3_read() != 0);
+ }
+
+ return false;
+}
+
+static void byte_enabled_set(ft245_t *ft245, uint8_t byte, bool enabled)
+{
+ switch(byte) {
+ case 0:
+ ft245->BE0_to_output();
+ if(enabled)
+ ft245->BE0_set();
+ else
+ ft245->BE0_reset();
+ break;
+ case 1:
+ ft245->BE1_to_output();
+ if(enabled)
+ ft245->BE1_set();
+ else
+ ft245->BE1_reset();
+ break;
+ case 2:
+ ft245->BE2_to_output();
+ if(enabled)
+ ft245->BE2_set();
+ else
+ ft245->BE2_reset();
+ break;
+ case 3:
+ ft245->BE3_to_output();
+ if(enabled)
+ ft245->BE3_set();
+ else
+ ft245->BE3_reset();
+ break;
+ }
+}
+
+static bool tx_word(ft245_t *ft245)
+{
+ if(!cb_occupation(ft245->buffer_tx))
+ return false;
+
+ if(ft245->full_word_mode && (cb_occupation(ft245->buffer_tx) < 4))
+ return false;
+
+ data_out(ft245);
+
+ uint8_t data = 0;
+ uint32_t word = 0;
+
+ for(uint8_t i = 0; i < 4; i++) {
+ if(cb_occupation(ft245->buffer_tx)) {
+ cb_pop(ft245->buffer_tx, data);
+ byte_enabled_set(ft245, 3 - i, true);
+ } else {
+ data = 0;
+ byte_enabled_set(ft245, 3 - i, false);
+ }
+ word |= ((uint32_t) data) << (i * 8);
+ }
+
+ for(uint8_t i = 0; i < 32; i++) {
+ if((word >> i) & 0b1)
+ bit_set(ft245, i);
+ else
+ bit_reset(ft245, i);
+ }
+
+ return true;
+}
+
+static bool rx_word(ft245_t *ft245)
+{
+ data_in(ft245);
+
+ if((cb_size(ft245->buffer_rx) - cb_occupation(ft245->buffer_rx)) < 4)
+ return false;
+
+ if(ft245->full_word_mode && !(ft245->BE3_read() && ft245->BE2_read() && ft245->BE1_read() && ft245->BE0_read()))
+ return false;
+
+ uint8_t data[4];
+
+ if(ft245->BE3_read()) {
+ data[3] = ((((ft245->DATA31_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 7) |
+ (((ft245->DATA30_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 6) |
+ (((ft245->DATA29_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 5) |
+ (((ft245->DATA28_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 4) |
+ (((ft245->DATA27_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 3) |
+ (((ft245->DATA26_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 2) |
+ (((ft245->DATA25_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 1) |
+ (((ft245->DATA24_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 0));
+ cb_push(ft245->buffer_rx, data[3]);
+ } else {
+ data[3] = 0;
+ cb_push(ft245->buffer_rx, data[3]);
+ }
+
+ if(ft245->BE2_read()) {
+ data[2] = ((((ft245->DATA23_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 7) |
+ (((ft245->DATA22_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 6) |
+ (((ft245->DATA21_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 5) |
+ (((ft245->DATA20_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 4) |
+ (((ft245->DATA19_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 3) |
+ (((ft245->DATA18_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 2) |
+ (((ft245->DATA17_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 1) |
+ (((ft245->DATA16_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 0));
+ cb_push(ft245->buffer_rx, data[2]);
+ } else {
+ data[2] = 0;
+ cb_push(ft245->buffer_rx, data[2]);
+ }
+
+ if(ft245->BE1_read()) {
+ data[1] = ((((ft245->DATA15_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 7) |
+ (((ft245->DATA14_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 6) |
+ (((ft245->DATA13_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 5) |
+ (((ft245->DATA12_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 4) |
+ (((ft245->DATA11_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 3) |
+ (((ft245->DATA10_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 2) |
+ (((ft245->DATA9_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 1) |
+ (((ft245->DATA8_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 0));
+ cb_push(ft245->buffer_rx, data[1]);
+ } else {
+ data[1] = 0;
+ cb_push(ft245->buffer_rx, data[1]);
+ }
+
+ if(ft245->BE0_read()) {
+ data[0] = ((((ft245->DATA7_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 7) |
+ (((ft245->DATA6_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 6) |
+ (((ft245->DATA5_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 5) |
+ (((ft245->DATA4_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 4) |
+ (((ft245->DATA3_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 3) |
+ (((ft245->DATA2_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 2) |
+ (((ft245->DATA1_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 1) |
+ (((ft245->DATA0_read() == 0) ? ((uint32_t) 0) : ((uint32_t) 1)) << 0));
+ cb_push(ft245->buffer_rx, data[0]);
+ } else {
+ data[0] = 0;
+ cb_push(ft245->buffer_rx, data[0]);
+ }
+
+ // Check for sync word 0x66665555
+ if((data[3] == 0x55) && (data[2] == 0x55) && (data[1] == 0x66) && (data[0] == 0x66))
+ cb_reset(ft245->buffer_rx);
+
+ return true;
+}
+
+void ft245_periodic(ft245_t *ft245)
+{
+ static size_t oe_n = 0;
+ static size_t rd_n = 0;
+ static size_t wr_n = 0;
+ static size_t rst_n = 0;
+ bool rxf_n = false;
+ bool txe_n = false;
+ if(ft245->clk_state) {
+ ft245->CLK_reset();
+ ft245->clk_state = false;
+ } else {
+ ft245->CLK_set();
+ ft245->clk_state = true;
+
+ oe_n = ft245->OE_N_read() ? 0 : (oe_n + 1);
+ rd_n = ft245->RD_N_read() ? 0 : (rd_n + 1);
+ wr_n = ft245->WR_N_read() ? 0 : (wr_n + 1);
+ rst_n = ft245->RST_N_read() ? 0 : (rst_n + 1);
+
+ if(rst_n)
+ return;
+
+ rxf_n = (cb_occupation(ft245->buffer_tx) > (ft245->full_word_mode ? 3 : 0));
+ txe_n = !cb_full(ft245->buffer_rx);
+
+ if(rxf_n)
+ ft245->RXF_N_reset();
+ else
+ ft245->RXF_N_set();
+
+ if(txe_n)
+ ft245->TXE_N_reset();
+ else
+ ft245->TXE_N_set();
+
+ // OE_N low => Output Enable
+ // RD_N low => Read access for master
+ // Both required to drive data
+ if(rxf_n && oe_n && rd_n) {
+ tx_word(ft245);
+ } else if(txe_n && wr_n) {
+ rx_word(ft245);
+ } else {
+ data_in(ft245);
+ }
+ }
+}
+
+bool ft245_write_buffered(ft245_t *ft245, uint8_t *data, size_t size)
+{
+ if(cb_full(ft245->buffer_tx))
+ return false;
+
+ if(cb_size(ft245->buffer_tx) - cb_occupation(ft245->buffer_tx) < size)
+ return false;
+
+ for(size_t i = 0; i < size; i++)
+ cb_push(ft245->buffer_tx, data[i]);
+
+ return true;
+}
+
+bool ft245_read_buffered(ft245_t *ft245, uint8_t *data, size_t size)
+{
+ if(cb_occupation(ft245->buffer_rx) < size)
+ return false;
+
+ for(size_t i = 0; i < size; i++)
+ cb_pop(ft245->buffer_rx, data[i]);
+
+ return true;
+}
+
+bool ft245_write_word_buffered(ft245_t *ft245, uint32_t word)
+{
+ while(atomic_flag_test_and_set_explicit(&lock, memory_order_acquire));
+ if(cb_size(ft245->buffer_tx) - cb_occupation(ft245->buffer_tx) < 4) {
+ atomic_flag_clear_explicit(&lock, memory_order_release);
+ return false;
+ }
+
+ cb_push(ft245->buffer_tx, (word >> 0) & 0xFF);
+ cb_push(ft245->buffer_tx, (word >> 8) & 0xFF);
+ cb_push(ft245->buffer_tx, (word >> 16) & 0xFF);
+ cb_push(ft245->buffer_tx, (word >> 24) & 0xFF);
+
+ atomic_flag_clear_explicit(&lock, memory_order_release);
+
+ return true;
+}
+
+bool ft245_read_word_buffered(ft245_t *ft245, uint32_t *word)
+{
+ while(atomic_flag_test_and_set_explicit(&lock, memory_order_acquire));
+ if(cb_occupation(ft245->buffer_rx) < 4) {
+ atomic_flag_clear_explicit(&lock, memory_order_release);
+ return false;
+ }
+
+ uint8_t data = 0;
+ cb_pop(ft245->buffer_rx, data);
+ *word |= ((uint32_t) data) << 24;
+ cb_pop(ft245->buffer_rx, data);
+ *word |= ((uint32_t) data) << 16;
+ cb_pop(ft245->buffer_rx, data);
+ *word |= ((uint32_t) data) << 8;
+ cb_pop(ft245->buffer_rx, data);
+ *word |= ((uint32_t) data) << 0;
+
+ atomic_flag_clear_explicit(&lock, memory_order_release);
+
+ return true;
+}
+
+size_t ft245_available_read(ft245_t *ft245)
+{
+ return cb_occupation(ft245->buffer_rx);
+}
+
+size_t ft245_available_write(ft245_t *ft245)
+{
+ return (cb_size(ft245->buffer_tx) - cb_occupation(ft245->buffer_tx));
+} \ No newline at end of file
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-23 18:12:43 +0000