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openFPGALoader
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Attempt to satisfy a comment from the owner

This commit is contained in:
phdussud 2021-02-27 12:45:12 -08:00
parent fdd1037d46
commit 5d8ec9a162
1 changed files with 11 additions and 2 deletions
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13
src/dirtyJtag.cpp
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@ -54,6 +54,15 @@ enum CommandModifier {
NO_READ = 0x80 NO_READ = 0x80
}; };
struct version_specific
{
uint8_t no_read; //command modifer for xfer no read
uint16_t max_bits; //max bit count that can be transferred
};
static version_specific v_options[4] ={{0, 240}, {0, 240}, {NO_READ, 496}, {NO_READ, 4000}};
enum dirtyJtagSig { enum dirtyJtagSig {
SIG_TCK = (1 << 1), SIG_TCK = (1 << 1),
SIG_TDI = (1 << 2), SIG_TDI = (1 << 2),
@ -224,8 +233,8 @@ int DirtyJtag::writeTDI(uint8_t *tx, uint8_t *rx, uint32_t len, bool end)
memset(tx_cpy, 0, real_byte_len); memset(tx_cpy, 0, real_byte_len);
tx_ptr = tx_cpy; tx_ptr = tx_cpy;
tx_buf[0] = CMD_XFER | ((rx || (_version <= 1)) ? 0 : NO_READ); tx_buf[0] = CMD_XFER | (rx ? 0 : v_options[_version].no_read );
uint16_t max_bit_transfer_length = (uint16_t[]){240, 496, 4000}[_version -1]; uint16_t max_bit_transfer_length = v_options[_version].max_bits;
assert(max_bit_transfer_length %8 == 0);//need to cut the bits on byte size. assert(max_bit_transfer_length %8 == 0);//need to cut the bits on byte size.
while (real_bit_len != 0) { while (real_bit_len != 0) {
uint16_t bit_to_send = (real_bit_len > max_bit_transfer_length) ? max_bit_transfer_length : real_bit_len; uint16_t bit_to_send = (real_bit_len > max_bit_transfer_length) ? max_bit_transfer_length : real_bit_len;