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Add usart btfactory

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This commit is contained in:
Philippe Teuwen 2019-05-15 02:15:19 +02:00
commit 8401eb4e14
5 changed files with 325 additions and 15 deletions
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45
common/usart.c
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@ -16,6 +16,8 @@ volatile AT91PS_USART pUS1 = AT91C_BASE_US1;
volatile AT91PS_PIO pPIO = AT91C_BASE_PIOA;
volatile AT91PS_PDC pPDC = AT91C_BASE_PDC_US1;
uint32_t usart_baudrate = 0;
uint8_t usart_parity = 0;
/*
void usart_close(void) {
// Reset the USART mode
@ -170,7 +172,12 @@ inline int usart_writebuffer_sync(uint8_t *data, size_t len) {
return PM3_SUCCESS;
}
void usart_init(void) {
void usart_init(uint32_t baudrate, uint8_t parity) {
if (baudrate != 0)
usart_baudrate = baudrate;
if ((parity == 'N') || (parity == 'O') || (parity == 'E'))
usart_parity = parity;
// For a nice detailed sample, interrupt driven but still relevant.
// See https://www.sparkfun.com/datasheets/DevTools/SAM7/at91sam7%20serial%20communications.pdf
@ -192,18 +199,33 @@ void usart_init(void) {
pPIO->PIO_PPUER |= (AT91C_PA21_RXD1 | AT91C_PA22_TXD1);
// 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
AT91C_US_CHMODE_NORMAL; // channel mode: normal
uint32_t mode = 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_NBSTOP_1_BIT | // 1 stop bit
AT91C_US_CHMODE_NORMAL; // channel mode: normal
switch(usart_parity) {
case 'N':
mode |= AT91C_US_PAR_NONE; // parity: none
break;
case 'O':
mode |= AT91C_US_PAR_ODD; // parity: odd
break;
case 'E':
mode |= AT91C_US_PAR_EVEN; // parity: even
break;
}
pUS1->US_MR = mode;
// all interrupts disabled
pUS1->US_IDR = 0xFFFF;
pUS1->US_BRGR = 48054841 / (USART_BAUD_RATE << 3);
// note that for very large baudrates, error is not neglectible:
// b921600 => 8.6%
// b1382400 => 8.6%
pUS1->US_BRGR = 48054841 / (usart_baudrate << 3);
// Write the Timeguard Register
pUS1->US_TTGR = 0;
@ -219,9 +241,14 @@ void usart_init(void) {
pUS1->US_RPR = (uint32_t)us_inbuf1;
pUS1->US_RCR = USART_BUFFLEN;
usart_cur_inbuf = us_inbuf1;
usart_cur_inbuf_off = 0;
pUS1->US_RNPR = (uint32_t)us_inbuf2;
pUS1->US_RNCR = USART_BUFFLEN;
// Initialize our fifo
us_rxfifo_low = 0;
us_rxfifo_high = 0;
// re-enable receiver / transmitter
pUS1->US_CR = (AT91C_US_RXEN | AT91C_US_TXEN);

8
common/usart.h
View file

@ -7,10 +7,12 @@
//#define USART_BAUD_RATE 9600
#define USART_BAUD_RATE 115200
//#define USART_BAUD_RATE 460800
extern uint32_t usart_baudrate;
#define USART_PARITY 'N'
extern uint8_t usart_parity;
void usart_init(void);
void usart_close(void);
void usart_init(uint32_t baudrate, uint8_t parity);
//void usart_close(void);
int usart_writebuffer_sync(uint8_t *data, size_t len);
uint32_t usart_read_ng(uint8_t *data, size_t len);