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Sansa Connect: Ensure adequate AVR Slave Select delay

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Waiting 10 us between selecting slave and transmitting data on SPI
resolves spurious startup glitches.

Cache last read monotime value as it can differ from the first one.

Change-Id: Ia6ac5696f6ee2bc3c6a8be27e33aaddd9ff4ce2a
This commit is contained in:
Tomasz Moń 2021-06-27 13:32:20 +02:00
parent 1b81bd8a61
commit 3c7c71030f
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GPG key ID: 92BA8820D4D517C8
1 changed files with 2 additions and 1 deletions
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3
firmware/target/arm/tms320dm320/sansa-connect/avr-sansaconnect.c
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@ -376,6 +376,7 @@ static bool avr_run_command(uint8_t opcode, uint8_t *data, size_t data_length)
IO_SERIAL1_TX_ENABLE = 0x0001;
avr_hid_select();
udelay(10);
IO_SERIAL1_TX_DATA = CMD_SYNC;
spi_read_byte();
@ -660,7 +661,7 @@ static void read_monotime(void)
if ((t1 == t2) || (t1 + 1 == t2))
{
int flags = disable_irq_save();
monotime_value = t1;
monotime_value = t2;
monotime_value_tick = current_tick;
restore_irq(flags);
monotime_available = true;