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FPC experiments: use oversampling, tested FPC at 460800 ^^

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This commit is contained in:
Philippe Teuwen 2019-04-02 01:20:02 +02:00
parent 7bd95dd5c3
commit dae6eefa52
1 changed files with 7 additions and 10 deletions
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17
common/usart.c
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@ -87,6 +87,9 @@ inline int16_t usart_writebuffer(uint8_t *data, size_t len) {
void usart_init(void) {
// For a nice detailed sample, interrupt driven but still relevant.
// See https://www.sparkfun.com/datasheets/DevTools/SAM7/at91sam7%20serial%20communications.pdf
// disable & reset receiver / transmitter for configuration
pUS1->US_CR = (AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RXDIS | AT91C_US_TXDIS);
@ -106,6 +109,7 @@ void usart_init(void) {
// set mode
pUS1->US_MR = AT91C_US_USMODE_NORMAL | // normal mode
AT91C_US_CLKS_CLOCK | // MCK (48MHz)
AT91C_US_OVER | // oversampling
AT91C_US_CHRL_8_BITS | // 8 bits
AT91C_US_PAR_NONE | // parity: none
AT91C_US_NBSTOP_1_BIT | // 1 stop bit
@ -114,16 +118,9 @@ void usart_init(void) {
// all interrupts disabled
pUS1->US_IDR = 0xFFFF;
// iceman, setting 115200 doesn't work. Only speed I got to work is 9600.
// something fishy with the AT91SAM7S512 USART.. Or I missed something
// For a nice detailed sample, interrupt driven but still relevant.
// See https://www.sparkfun.com/datasheets/DevTools/SAM7/at91sam7%20serial%20communications.pdf
// set baudrate to 115200
// 115200 * 16 == 1843200
//
//pUS1->US_BRGR = (48UL*1000*1000) / (9600*16);
pUS1->US_BRGR = 48054841 / (115200 << 4);
pUS1->US_BRGR = 48054841 / (115200 << 3);
// Need speed?
//pUS1->US_BRGR = 48054841 / (460800 << 3);
// Write the Timeguard Register
pUS1->US_TTGR = 0;