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jlink/swd_low_access: Fix data direction during response read phase.

This commit is contained in:
Uwe Bonnes 2020-11-29 15:32:38 +01:00 committed by UweBonnes
parent 8903026c14
commit 9e1b7fdac0
1 changed files with 10 additions and 3 deletions
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13
src/platforms/hosted/jlink_adiv5_swdp.c
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@ -252,10 +252,17 @@ static uint32_t jlink_adiv5_swdp_low_access(ADIv5_DP_t *dp, uint8_t RnW,
uint8_t res[8]; uint8_t res[8];
cmd[0] = CMD_HW_JTAG3; cmd[0] = CMD_HW_JTAG3;
cmd[1] = 0; cmd[1] = 0;
cmd[2] = (RnW) ? 11 : 13; /* Turnaround inserted automatically? */ /* It seems, JLINK samples read data at end of previous clock.
* So target data read must start at the 12'th clock, while
* write starts as expected at the 14'th clock (8 cmd, 3 response,
* 2 turn around.
*/
cmd[2] = (RnW) ? 11 : 13;
cmd[3] = 0; cmd[3] = 0;
cmd[4] = 0xff; cmd[4] = 0xff; /* 8 bits command OUT */
cmd[5] = 0xfe; cmd[5] = 0xf0; /* one IN bit to turn around to read, read 2
(read) or 3 (write) IN bits for response and
and one OUT bit to turn around to write on write*/
cmd[6] = request; cmd[6] = request;
cmd[7] = 0x00; cmd[7] = 0x00;
platform_timeout_set(&timeout, 2000); platform_timeout_set(&timeout, 2000);