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improve I²C master debugging

This commit is contained in:
King Kévin 2022-07-11 16:40:47 +02:00
parent 5be8874b3c
commit 03e6875a94
1 changed files with 22 additions and 6 deletions
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28
main.c
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@ -51,7 +51,11 @@ void putc(char c)
// don't wait until the transmission is complete // don't wait until the transmission is complete
} }
void puts(const char* s) // enable/disable UART debug
//#define puts(X) {}
#define puts(X) puts_uart(X)
void puts_uart(const char* s)
{ {
if (NULL == s) { if (NULL == s) {
return; return;
@ -296,32 +300,41 @@ we will only be able to provide 1 extension block since we can only respond to o
} else { } else {
IWDG_KR = IWDG_KR_KEY_REFRESH; // reset watchdog IWDG_KR = IWDG_KR_KEY_REFRESH; // reset watchdog
puts("reading sink EDID: "); puts("reading sink EDID: ");
softi2c_master_setup(100); // start the I²C master to talk to sink uint8_t i2c_rc = 1; // if the complete read succeeded
bool i2c_success = false; // if the complete read succeeded if (!softi2c_master_setup(1)) { // start the I²C master to talk to sink
i2c_rc = 2;
goto i2c_end;
}
if (!softi2c_master_start()) { // start transaction if (!softi2c_master_start()) { // start transaction
i2c_rc = 3;
goto i2c_end; goto i2c_end;
} }
if (!softi2c_master_select_slave(0x50, true)) { // select EDID if (!softi2c_master_select_slave(0x50, true)) { // select EDID
i2c_rc = 4;
goto i2c_end; goto i2c_end;
} }
const uint8_t edid_addr = 0x00; // EDID address to read const uint8_t edid_addr = 0x00; // EDID address to read
if (!softi2c_master_write(&edid_addr, 1)) { // write address to read if (!softi2c_master_write(&edid_addr, 1)) { // write address to read
i2c_rc = 5;
goto i2c_end; goto i2c_end;
} }
if (!softi2c_master_start()) { // re-start transaction if (!softi2c_master_start()) { // re-start transaction
i2c_rc = 6;
goto i2c_end; goto i2c_end;
} }
if (!softi2c_master_select_slave(0x50, false)) { // re-select EDID if (!softi2c_master_select_slave(0x50, false)) { // re-select EDID
i2c_rc = 7;
goto i2c_end; goto i2c_end;
} }
uint8_t edid_sink[256]; // buffer for sink EDID uint8_t edid_sink[256]; // buffer for sink EDID
if (!softi2c_master_read(edid_sink, ARRAY_LENGTH(edid_sink))) { // read EDID if (!softi2c_master_read(edid_sink, ARRAY_LENGTH(edid_sink))) { // read EDID
i2c_rc = 8;
goto i2c_end; goto i2c_end;
} }
i2c_success = true; // complete read succeeded i2c_rc = 0; // complete read succeeded
i2c_end: i2c_end:
softi2c_master_stop(); softi2c_master_stop();
if (i2c_success) { if (0 == i2c_rc) {
puts("success\r\n"); puts("success\r\n");
const uint16_t edid_len = edid_length(edid_sink); // get length const uint16_t edid_len = edid_length(edid_sink); // get length
if (edid_len) { // EDID is valid if (edid_len) { // EDID is valid
@ -394,7 +407,10 @@ level pulse on the Hot Plug Detect pin. This pulse shall be at least 100 msec.
} }
} }
} else { } else {
puts("fail\r\n"); LED_PORT->ODR.reg &= ~LED_PIN; // switch LED on to indicate I²C read fail
puts("fail (rc=");
putc('0' + i2c_rc);
puts(")\r\n");
} }
} }