diff options
Diffstat (limited to 'src/target_dsp/calypso/dsp_sniff.S')
| -rw-r--r-- | src/target_dsp/calypso/dsp_sniff.S | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/target_dsp/calypso/dsp_sniff.S b/src/target_dsp/calypso/dsp_sniff.S index 5a323f29..225e2ebb 100644 --- a/src/target_dsp/calypso/dsp_sniff.S +++ b/src/target_dsp/calypso/dsp_sniff.S @@ -2,6 +2,7 @@ ; ; (C) 2010 by Sylvain Munaut <tnt@246tNt.com> +; (C) 2011 by Steve Markgraf <steve@steve-m.de> ; ; All Rights Reserved ; @@ -39,6 +40,20 @@ fq_4320_push .equ 0xAA9F fq_4330_push .equ 0xAA6C fq_4340_push .equ 0xAAC3 +; ---------------------------------------------------------------------------- +; MCSI (Multi-Channel Serial Interface) +; ---------------------------------------------------------------------------- + + ; MCSI registers +MCSI_CONTROL_REG .equ 0x800 +MCSI_MAIN_PARAM_REG .equ 0x801 +MCSI_CLOCK_REG .equ 0x805 +MCSI_STATUS_REG .equ 0x806 +MCSI_TX0_REG .equ 0x820 + + ; MCSI STATUS_REG bits +MCSI_TX_READY .equ 0x10 +MCSI_TX_UNFLOW .equ 0x20 ; ---------------------------------------------------------------------------- ; Our double buffer API @@ -51,6 +66,9 @@ sniff_db1 .ds 138 sniff_db_ptr .ds 1 sniff_burst_ptr .ds 1 + ; Variables for MCSI +mcsi_tmp .ds 1 +mcsi_cnt .ds 1 ; ---------------------------------------------------------------------------- ; The code itself @@ -133,6 +151,105 @@ sniff_task: ret ; +; MCSI clear status +; +; Clears the MCSI status register, needs AR1 to be set to point to a temp word +; +mcsi_clear_status: + ; The MCSI_TX_READY bit is cleared with a 1 + st #MCSI_TX_READY, *AR1 + portw *AR1, MCSI_STATUS_REG + ret + +; +; MCSI initialisation +; +; Initializes and enables the MCSI +; +mcsi_init: + stm #mcsi_tmp, AR1 + + ; Use a clock divider of 2 -> 13MHz/2 = 6.5MHz + st #2, *AR1 + portw *AR1, MCSI_CLOCK_REG + + ; Set MCSI parameters: 16 bit framesize, master mode + st #0x4F, *AR1 + portw *AR1, MCSI_MAIN_PARAM_REG + + ; Enable MCSI clock + st #1, *AR1 + portw *AR1, MCSI_CONTROL_REG + + call mcsi_clear_status + + ; Done + ret + +; +; MCSI send word +; +; Sends a word of 16 bits over the MCSI and increases the source address +; Parameter: the address of the word has to be stored in AR4 +; +mcsi_send_word: + stm #mcsi_tmp, AR1 + call mcsi_clear_status + + ; Write TX word and increase address + portw *AR4+, MCSI_TX0_REG + + ; Loop until TX_READY bit of MCSI_STATUS_REG + ; has been set (happens around the 4th transmitted bit) +1: + portr MCSI_STATUS_REG, *AR1 + bitf *AR1, #MCSI_TX_READY + bc 1b, ntc + + ; Done + ret + +; +; MCSI send burst +; +; Sends a burst of *AR2 words, beginning at the address of AR4 +; Parameters: the number of words to send at *AR2, start-address in AR4 +; +mcsi_send_burst: + ; Load word-count in A + ldu *AR2, A + + ; Loop over all words +1: + call mcsi_send_word + sub #1, A + bc 1b, aneq + + ; Done + ret + +; +; MCSI disable +; +; waits until the last word has been sent and disables the MCSI +; +mcsi_disable: + stm #mcsi_tmp, AR1 + +1: ; Loop until TX_UNFLOW bit of MCSI_STATUS_REG + ; has been set (can only be reset with SW_RESET) + portr MCSI_STATUS_REG, *AR1 + bitf *AR1, #MCSI_TX_UNFLOW + bc 1b, ntc + + ; disable MCSI clock and set SW_RESET + st #2, *AR1 + portw *AR1, MCSI_CONTROL_REG + + ; Done + ret + +; ; Burst data handler ; ; Called once the DMA transfer is done and the IQ bits are received. @@ -140,6 +257,20 @@ sniff_task: ; done for us. Only real work goes here. ; burst_handler: + ; Store address of I/Q data + stm #0x0CCE, AR4 + + ; Initialize MCSI + call mcsi_init + + ; Send the I/Q data over MCSI + stm #mcsi_cnt, AR2 + stm #380, *AR2 ; 190 samples, 380 words + call mcsi_send_burst + + ; Disable MCSI + call mcsi_disable + ; NB demodulation ld #0x34, A call jt4387_exec @@ -162,9 +293,23 @@ burst_handler: rpt *(AR1) mvdd *AR2+, *AR3+ + ; Backup the old burst begin address + mvdm @sniff_burst_ptr, AR4 + ; Store the new pointer mvmd AR3, @sniff_burst_ptr + ; Initialize MCSI + call mcsi_init + + ; Send the demodulated burst data over MCSI + stm #mcsi_cnt, AR2 + stm #34, *AR2 ; 5 + 29 words + call mcsi_send_burst + + ; Disable MCSI + call mcsi_disable + ; Increment received bursts count mvdm @sniff_db_ptr, AR1 nop ; (pipeline conflict) |