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FPC experiments: got so far TX_only, usart=115200 + usb=460800, see full commit msg

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* Add \r\n to sent strings
* remove usart_init() from UsbPacketReceive cmd, it's already init in main.
* Add PLATFORM PM3RDV4FPC to ease dev
* TX: US_TCR is len of data to send, not len of buffer
* Use only one PDC bank as we're using it in sync
* Busy loop to wait for end of TX as we'using it in sync
* Change usart speed to 115200
* Don't downgrade USB speed, keep 460800
* Attempt to detect received data, fail so far
This commit is contained in:
Philippe Teuwen 2019-04-02 01:06:00 +02:00
commit 7bd95dd5c3
5 changed files with 29 additions and 37 deletions
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21
common/usart.c
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@ -66,27 +66,20 @@ inline int16_t usart_readbuffer(uint8_t *data, size_t len) {
}
}
inline bool usart_dataavailable(void) {
return (pUS1->US_CSR & AT91C_US_RXRDY) != 0;
}
// transfer from device to client
inline int16_t usart_writebuffer(uint8_t *data, size_t len) {
// Check if the first PDC bank is free
if (!(pUS1->US_TCR)) {
if (pUS1->US_TCR == 0) {
memcpy(us_outbuf, data, len);
pUS1->US_TPR = (uint32_t)us_outbuf;
pUS1->US_TCR = sizeof(us_outbuf);
pUS1->US_TCR = len;
pUS1->US_PTCR = AT91C_PDC_TXTEN | AT91C_PDC_RXTDIS;
while((pUS1->US_CSR & AT91C_US_TXEMPTY) ==0) {};
return 2;
}
// Check if the second PDC bank is free
else if (!(pUS1->US_TNCR)) {
memcpy(us_outbuf, data, len);
pUS1->US_TNPR = (uint32_t)us_outbuf;
pUS1->US_TNCR = sizeof(us_outbuf);
pUS1->US_PTCR = AT91C_PDC_TXTEN | AT91C_PDC_RXTDIS;
return 1;
} else {
return 0;
}
@ -130,7 +123,7 @@ void usart_init(void) {
// 115200 * 16 == 1843200
//
//pUS1->US_BRGR = (48UL*1000*1000) / (9600*16);
pUS1->US_BRGR = 48054841 / (9600 << 4);
pUS1->US_BRGR = 48054841 / (115200 << 4);
// Write the Timeguard Register
pUS1->US_TTGR = 0;